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|
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
- * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
- *
- * Authors:
- * Paul Mackerras <paulus@au1.ibm.com>
- * Alexander Graf <agraf@suse.de>
- * Kevin Wolf <mail@kevin-wolf.de>
- *
- * Description: KVM functions specific to running on Book 3S
- * processors in hypervisor mode (specifically POWER7 and later).
- *
- * This file is derived from arch/powerpc/kvm/book3s.c,
- * by Alexander Graf <agraf@suse.de>.
- */
- #include <linux/kvm_host.h>
- #include <linux/kernel.h>
- #include <linux/err.h>
- #include <linux/slab.h>
- #include <linux/preempt.h>
- #include <linux/sched/signal.h>
- #include <linux/sched/stat.h>
- #include <linux/delay.h>
- #include <linux/export.h>
- #include <linux/fs.h>
- #include <linux/anon_inodes.h>
- #include <linux/cpu.h>
- #include <linux/cpumask.h>
- #include <linux/spinlock.h>
- #include <linux/page-flags.h>
- #include <linux/srcu.h>
- #include <linux/miscdevice.h>
- #include <linux/debugfs.h>
- #include <linux/gfp.h>
- #include <linux/vmalloc.h>
- #include <linux/highmem.h>
- #include <linux/hugetlb.h>
- #include <linux/kvm_irqfd.h>
- #include <linux/irqbypass.h>
- #include <linux/module.h>
- #include <linux/compiler.h>
- #include <linux/of.h>
- #include <asm/ftrace.h>
- #include <asm/reg.h>
- #include <asm/ppc-opcode.h>
- #include <asm/asm-prototypes.h>
- #include <asm/archrandom.h>
- #include <asm/debug.h>
- #include <asm/disassemble.h>
- #include <asm/cputable.h>
- #include <asm/cacheflush.h>
- #include <linux/uaccess.h>
- #include <asm/io.h>
- #include <asm/kvm_ppc.h>
- #include <asm/kvm_book3s.h>
- #include <asm/mmu_context.h>
- #include <asm/lppaca.h>
- #include <asm/pmc.h>
- #include <asm/processor.h>
- #include <asm/cputhreads.h>
- #include <asm/page.h>
- #include <asm/hvcall.h>
- #include <asm/switch_to.h>
- #include <asm/smp.h>
- #include <asm/dbell.h>
- #include <asm/hmi.h>
- #include <asm/pnv-pci.h>
- #include <asm/mmu.h>
- #include <asm/opal.h>
- #include <asm/xics.h>
- #include <asm/xive.h>
- #include <asm/hw_breakpoint.h>
- #include <asm/kvm_book3s_uvmem.h>
- #include <asm/ultravisor.h>
- #include <asm/dtl.h>
- #include "book3s.h"
- #define CREATE_TRACE_POINTS
- #include "trace_hv.h"
- /* #define EXIT_DEBUG */
- /* #define EXIT_DEBUG_SIMPLE */
- /* #define EXIT_DEBUG_INT */
- /* Used to indicate that a guest page fault needs to be handled */
- #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
- /* Used to indicate that a guest passthrough interrupt needs to be handled */
- #define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2)
- /* Used as a "null" value for timebase values */
- #define TB_NIL (~(u64)0)
- static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
- static int dynamic_mt_modes = 6;
- module_param(dynamic_mt_modes, int, 0644);
- MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)");
- static int target_smt_mode;
- module_param(target_smt_mode, int, 0644);
- MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)");
- static bool indep_threads_mode = true;
- module_param(indep_threads_mode, bool, S_IRUGO | S_IWUSR);
- MODULE_PARM_DESC(indep_threads_mode, "Independent-threads mode (only on POWER9)");
- static bool one_vm_per_core;
- module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR);
- MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires indep_threads_mode=N)");
- #ifdef CONFIG_KVM_XICS
- static const struct kernel_param_ops module_param_ops = {
- .set = param_set_int,
- .get = param_get_int,
- };
- module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644);
- MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization");
- module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644);
- MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core");
- #endif
- /* If set, guests are allowed to create and control nested guests */
- static bool nested = true;
- module_param(nested, bool, S_IRUGO | S_IWUSR);
- MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)");
- static inline bool nesting_enabled(struct kvm *kvm)
- {
- return kvm->arch.nested_enable && kvm_is_radix(kvm);
- }
- /* If set, the threads on each CPU core have to be in the same MMU mode */
- static bool no_mixing_hpt_and_radix;
- static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
- /*
- * RWMR values for POWER8. These control the rate at which PURR
- * and SPURR count and should be set according to the number of
- * online threads in the vcore being run.
- */
- #define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL
- #define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL
- #define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL
- #define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL
- #define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL
- #define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL
- #define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL
- #define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL
- static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = {
- RWMR_RPA_P8_1THREAD,
- RWMR_RPA_P8_1THREAD,
- RWMR_RPA_P8_2THREAD,
- RWMR_RPA_P8_3THREAD,
- RWMR_RPA_P8_4THREAD,
- RWMR_RPA_P8_5THREAD,
- RWMR_RPA_P8_6THREAD,
- RWMR_RPA_P8_7THREAD,
- RWMR_RPA_P8_8THREAD,
- };
- static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc,
- int *ip)
- {
- int i = *ip;
- struct kvm_vcpu *vcpu;
- while (++i < MAX_SMT_THREADS) {
- vcpu = READ_ONCE(vc->runnable_threads[i]);
- if (vcpu) {
- *ip = i;
- return vcpu;
- }
- }
- return NULL;
- }
- /* Used to traverse the list of runnable threads for a given vcore */
- #define for_each_runnable_thread(i, vcpu, vc) \
- for (i = -1; (vcpu = next_runnable_thread(vc, &i)); )
- static bool kvmppc_ipi_thread(int cpu)
- {
- unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER);
- /* If we're a nested hypervisor, fall back to ordinary IPIs for now */
- if (kvmhv_on_pseries())
- return false;
- /* On POWER9 we can use msgsnd to IPI any cpu */
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- msg |= get_hard_smp_processor_id(cpu);
- smp_mb();
- __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
- return true;
- }
- /* On POWER8 for IPIs to threads in the same core, use msgsnd */
- if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
- preempt_disable();
- if (cpu_first_thread_sibling(cpu) ==
- cpu_first_thread_sibling(smp_processor_id())) {
- msg |= cpu_thread_in_core(cpu);
- smp_mb();
- __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
- preempt_enable();
- return true;
- }
- preempt_enable();
- }
- #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
- if (cpu >= 0 && cpu < nr_cpu_ids) {
- if (paca_ptrs[cpu]->kvm_hstate.xics_phys) {
- xics_wake_cpu(cpu);
- return true;
- }
- opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY);
- return true;
- }
- #endif
- return false;
- }
- static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
- {
- int cpu;
- struct rcuwait *waitp;
- waitp = kvm_arch_vcpu_get_wait(vcpu);
- if (rcuwait_wake_up(waitp))
- ++vcpu->stat.halt_wakeup;
- cpu = READ_ONCE(vcpu->arch.thread_cpu);
- if (cpu >= 0 && kvmppc_ipi_thread(cpu))
- return;
- /* CPU points to the first thread of the core */
- cpu = vcpu->cpu;
- if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu))
- smp_send_reschedule(cpu);
- }
- /*
- * We use the vcpu_load/put functions to measure stolen time.
- * Stolen time is counted as time when either the vcpu is able to
- * run as part of a virtual core, but the task running the vcore
- * is preempted or sleeping, or when the vcpu needs something done
- * in the kernel by the task running the vcpu, but that task is
- * preempted or sleeping. Those two things have to be counted
- * separately, since one of the vcpu tasks will take on the job
- * of running the core, and the other vcpu tasks in the vcore will
- * sleep waiting for it to do that, but that sleep shouldn't count
- * as stolen time.
- *
- * Hence we accumulate stolen time when the vcpu can run as part of
- * a vcore using vc->stolen_tb, and the stolen time when the vcpu
- * needs its task to do other things in the kernel (for example,
- * service a page fault) in busy_stolen. We don't accumulate
- * stolen time for a vcore when it is inactive, or for a vcpu
- * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
- * a misnomer; it means that the vcpu task is not executing in
- * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
- * the kernel. We don't have any way of dividing up that time
- * between time that the vcpu is genuinely stopped, time that
- * the task is actively working on behalf of the vcpu, and time
- * that the task is preempted, so we don't count any of it as
- * stolen.
- *
- * Updates to busy_stolen are protected by arch.tbacct_lock;
- * updates to vc->stolen_tb are protected by the vcore->stoltb_lock
- * lock. The stolen times are measured in units of timebase ticks.
- * (Note that the != TB_NIL checks below are purely defensive;
- * they should never fail.)
- */
- static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc)
- {
- unsigned long flags;
- spin_lock_irqsave(&vc->stoltb_lock, flags);
- vc->preempt_tb = mftb();
- spin_unlock_irqrestore(&vc->stoltb_lock, flags);
- }
- static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc)
- {
- unsigned long flags;
- spin_lock_irqsave(&vc->stoltb_lock, flags);
- if (vc->preempt_tb != TB_NIL) {
- vc->stolen_tb += mftb() - vc->preempt_tb;
- vc->preempt_tb = TB_NIL;
- }
- spin_unlock_irqrestore(&vc->stoltb_lock, flags);
- }
- static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
- {
- struct kvmppc_vcore *vc = vcpu->arch.vcore;
- unsigned long flags;
- /*
- * We can test vc->runner without taking the vcore lock,
- * because only this task ever sets vc->runner to this
- * vcpu, and once it is set to this vcpu, only this task
- * ever sets it to NULL.
- */
- if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
- kvmppc_core_end_stolen(vc);
- spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
- if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
- vcpu->arch.busy_preempt != TB_NIL) {
- vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
- vcpu->arch.busy_preempt = TB_NIL;
- }
- spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
- }
- static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
- {
- struct kvmppc_vcore *vc = vcpu->arch.vcore;
- unsigned long flags;
- if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
- kvmppc_core_start_stolen(vc);
- spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
- if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
- vcpu->arch.busy_preempt = mftb();
- spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
- }
- static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
- {
- vcpu->arch.pvr = pvr;
- }
- /* Dummy value used in computing PCR value below */
- #define PCR_ARCH_31 (PCR_ARCH_300 << 1)
- static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
- {
- unsigned long host_pcr_bit = 0, guest_pcr_bit = 0;
- struct kvmppc_vcore *vc = vcpu->arch.vcore;
- /* We can (emulate) our own architecture version and anything older */
- if (cpu_has_feature(CPU_FTR_ARCH_31))
- host_pcr_bit = PCR_ARCH_31;
- else if (cpu_has_feature(CPU_FTR_ARCH_300))
- host_pcr_bit = PCR_ARCH_300;
- else if (cpu_has_feature(CPU_FTR_ARCH_207S))
- host_pcr_bit = PCR_ARCH_207;
- else if (cpu_has_feature(CPU_FTR_ARCH_206))
- host_pcr_bit = PCR_ARCH_206;
- else
- host_pcr_bit = PCR_ARCH_205;
- /* Determine lowest PCR bit needed to run guest in given PVR level */
- guest_pcr_bit = host_pcr_bit;
- if (arch_compat) {
- switch (arch_compat) {
- case PVR_ARCH_205:
- guest_pcr_bit = PCR_ARCH_205;
- break;
- case PVR_ARCH_206:
- case PVR_ARCH_206p:
- guest_pcr_bit = PCR_ARCH_206;
- break;
- case PVR_ARCH_207:
- guest_pcr_bit = PCR_ARCH_207;
- break;
- case PVR_ARCH_300:
- guest_pcr_bit = PCR_ARCH_300;
- break;
- case PVR_ARCH_31:
- guest_pcr_bit = PCR_ARCH_31;
- break;
- default:
- return -EINVAL;
- }
- }
- /* Check requested PCR bits don't exceed our capabilities */
- if (guest_pcr_bit > host_pcr_bit)
- return -EINVAL;
- spin_lock(&vc->lock);
- vc->arch_compat = arch_compat;
- /*
- * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit
- * Also set all reserved PCR bits
- */
- vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK;
- spin_unlock(&vc->lock);
- return 0;
- }
- static void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
- {
- int r;
- pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
- pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
- vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap);
- for (r = 0; r < 16; ++r)
- pr_err("r%2d = %.16lx r%d = %.16lx\n",
- r, kvmppc_get_gpr(vcpu, r),
- r+16, kvmppc_get_gpr(vcpu, r+16));
- pr_err("ctr = %.16lx lr = %.16lx\n",
- vcpu->arch.regs.ctr, vcpu->arch.regs.link);
- pr_err("srr0 = %.16llx srr1 = %.16llx\n",
- vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
- pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
- vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
- pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
- vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
- pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n",
- vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr);
- pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
- pr_err("fault dar = %.16lx dsisr = %.8x\n",
- vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
- pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
- for (r = 0; r < vcpu->arch.slb_max; ++r)
- pr_err(" ESID = %.16llx VSID = %.16llx\n",
- vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
- pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
- vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
- vcpu->arch.last_inst);
- }
- static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
- {
- return kvm_get_vcpu_by_id(kvm, id);
- }
- static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
- {
- vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
- vpa->yield_count = cpu_to_be32(1);
- }
- static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
- unsigned long addr, unsigned long len)
- {
- /* check address is cacheline aligned */
- if (addr & (L1_CACHE_BYTES - 1))
- return -EINVAL;
- spin_lock(&vcpu->arch.vpa_update_lock);
- if (v->next_gpa != addr || v->len != len) {
- v->next_gpa = addr;
- v->len = addr ? len : 0;
- v->update_pending = 1;
- }
- spin_unlock(&vcpu->arch.vpa_update_lock);
- return 0;
- }
- /* Length for a per-processor buffer is passed in at offset 4 in the buffer */
- struct reg_vpa {
- u32 dummy;
- union {
- __be16 hword;
- __be32 word;
- } length;
- };
- static int vpa_is_registered(struct kvmppc_vpa *vpap)
- {
- if (vpap->update_pending)
- return vpap->next_gpa != 0;
- return vpap->pinned_addr != NULL;
- }
- static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
- unsigned long flags,
- unsigned long vcpuid, unsigned long vpa)
- {
- struct kvm *kvm = vcpu->kvm;
- unsigned long len, nb;
- void *va;
- struct kvm_vcpu *tvcpu;
- int err;
- int subfunc;
- struct kvmppc_vpa *vpap;
- tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
- if (!tvcpu)
- return H_PARAMETER;
- subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
- if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
- subfunc == H_VPA_REG_SLB) {
- /* Registering new area - address must be cache-line aligned */
- if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
- return H_PARAMETER;
- /* convert logical addr to kernel addr and read length */
- va = kvmppc_pin_guest_page(kvm, vpa, &nb);
- if (va == NULL)
- return H_PARAMETER;
- if (subfunc == H_VPA_REG_VPA)
- len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
- else
- len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
- kvmppc_unpin_guest_page(kvm, va, vpa, false);
- /* Check length */
- if (len > nb || len < sizeof(struct reg_vpa))
- return H_PARAMETER;
- } else {
- vpa = 0;
- len = 0;
- }
- err = H_PARAMETER;
- vpap = NULL;
- spin_lock(&tvcpu->arch.vpa_update_lock);
- switch (subfunc) {
- case H_VPA_REG_VPA: /* register VPA */
- /*
- * The size of our lppaca is 1kB because of the way we align
- * it for the guest to avoid crossing a 4kB boundary. We only
- * use 640 bytes of the structure though, so we should accept
- * clients that set a size of 640.
- */
- BUILD_BUG_ON(sizeof(struct lppaca) != 640);
- if (len < sizeof(struct lppaca))
- break;
- vpap = &tvcpu->arch.vpa;
- err = 0;
- break;
- case H_VPA_REG_DTL: /* register DTL */
- if (len < sizeof(struct dtl_entry))
- break;
- len -= len % sizeof(struct dtl_entry);
- /* Check that they have previously registered a VPA */
- err = H_RESOURCE;
- if (!vpa_is_registered(&tvcpu->arch.vpa))
- break;
- vpap = &tvcpu->arch.dtl;
- err = 0;
- break;
- case H_VPA_REG_SLB: /* register SLB shadow buffer */
- /* Check that they have previously registered a VPA */
- err = H_RESOURCE;
- if (!vpa_is_registered(&tvcpu->arch.vpa))
- break;
- vpap = &tvcpu->arch.slb_shadow;
- err = 0;
- break;
- case H_VPA_DEREG_VPA: /* deregister VPA */
- /* Check they don't still have a DTL or SLB buf registered */
- err = H_RESOURCE;
- if (vpa_is_registered(&tvcpu->arch.dtl) ||
- vpa_is_registered(&tvcpu->arch.slb_shadow))
- break;
- vpap = &tvcpu->arch.vpa;
- err = 0;
- break;
- case H_VPA_DEREG_DTL: /* deregister DTL */
- vpap = &tvcpu->arch.dtl;
- err = 0;
- break;
- case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */
- vpap = &tvcpu->arch.slb_shadow;
- err = 0;
- break;
- }
- if (vpap) {
- vpap->next_gpa = vpa;
- vpap->len = len;
- vpap->update_pending = 1;
- }
- spin_unlock(&tvcpu->arch.vpa_update_lock);
- return err;
- }
- static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
- {
- struct kvm *kvm = vcpu->kvm;
- void *va;
- unsigned long nb;
- unsigned long gpa;
- /*
- * We need to pin the page pointed to by vpap->next_gpa,
- * but we can't call kvmppc_pin_guest_page under the lock
- * as it does get_user_pages() and down_read(). So we
- * have to drop the lock, pin the page, then get the lock
- * again and check that a new area didn't get registered
- * in the meantime.
- */
- for (;;) {
- gpa = vpap->next_gpa;
- spin_unlock(&vcpu->arch.vpa_update_lock);
- va = NULL;
- nb = 0;
- if (gpa)
- va = kvmppc_pin_guest_page(kvm, gpa, &nb);
- spin_lock(&vcpu->arch.vpa_update_lock);
- if (gpa == vpap->next_gpa)
- break;
- /* sigh... unpin that one and try again */
- if (va)
- kvmppc_unpin_guest_page(kvm, va, gpa, false);
- }
- vpap->update_pending = 0;
- if (va && nb < vpap->len) {
- /*
- * If it's now too short, it must be that userspace
- * has changed the mappings underlying guest memory,
- * so unregister the region.
- */
- kvmppc_unpin_guest_page(kvm, va, gpa, false);
- va = NULL;
- }
- if (vpap->pinned_addr)
- kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
- vpap->dirty);
- vpap->gpa = gpa;
- vpap->pinned_addr = va;
- vpap->dirty = false;
- if (va)
- vpap->pinned_end = va + vpap->len;
- }
- static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
- {
- if (!(vcpu->arch.vpa.update_pending ||
- vcpu->arch.slb_shadow.update_pending ||
- vcpu->arch.dtl.update_pending))
- return;
- spin_lock(&vcpu->arch.vpa_update_lock);
- if (vcpu->arch.vpa.update_pending) {
- kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
- if (vcpu->arch.vpa.pinned_addr)
- init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
- }
- if (vcpu->arch.dtl.update_pending) {
- kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
- vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
- vcpu->arch.dtl_index = 0;
- }
- if (vcpu->arch.slb_shadow.update_pending)
- kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
- spin_unlock(&vcpu->arch.vpa_update_lock);
- }
- /*
- * Return the accumulated stolen time for the vcore up until `now'.
- * The caller should hold the vcore lock.
- */
- static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
- {
- u64 p;
- unsigned long flags;
- spin_lock_irqsave(&vc->stoltb_lock, flags);
- p = vc->stolen_tb;
- if (vc->vcore_state != VCORE_INACTIVE &&
- vc->preempt_tb != TB_NIL)
- p += now - vc->preempt_tb;
- spin_unlock_irqrestore(&vc->stoltb_lock, flags);
- return p;
- }
- static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
- struct kvmppc_vcore *vc)
- {
- struct dtl_entry *dt;
- struct lppaca *vpa;
- unsigned long stolen;
- unsigned long core_stolen;
- u64 now;
- unsigned long flags;
- dt = vcpu->arch.dtl_ptr;
- vpa = vcpu->arch.vpa.pinned_addr;
- now = mftb();
- core_stolen = vcore_stolen_time(vc, now);
- stolen = core_stolen - vcpu->arch.stolen_logged;
- vcpu->arch.stolen_logged = core_stolen;
- spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
- stolen += vcpu->arch.busy_stolen;
- vcpu->arch.busy_stolen = 0;
- spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
- if (!dt || !vpa)
- return;
- memset(dt, 0, sizeof(struct dtl_entry));
- dt->dispatch_reason = 7;
- dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
- dt->timebase = cpu_to_be64(now + vc->tb_offset);
- dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
- dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
- dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
- ++dt;
- if (dt == vcpu->arch.dtl.pinned_end)
- dt = vcpu->arch.dtl.pinned_addr;
- vcpu->arch.dtl_ptr = dt;
- /* order writing *dt vs. writing vpa->dtl_idx */
- smp_wmb();
- vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
- vcpu->arch.dtl.dirty = true;
- }
- /* See if there is a doorbell interrupt pending for a vcpu */
- static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu)
- {
- int thr;
- struct kvmppc_vcore *vc;
- if (vcpu->arch.doorbell_request)
- return true;
- /*
- * Ensure that the read of vcore->dpdes comes after the read
- * of vcpu->doorbell_request. This barrier matches the
- * smp_wmb() in kvmppc_guest_entry_inject().
- */
- smp_rmb();
- vc = vcpu->arch.vcore;
- thr = vcpu->vcpu_id - vc->first_vcpuid;
- return !!(vc->dpdes & (1 << thr));
- }
- static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
- {
- if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
- return true;
- if ((!vcpu->arch.vcore->arch_compat) &&
- cpu_has_feature(CPU_FTR_ARCH_207S))
- return true;
- return false;
- }
- static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
- unsigned long resource, unsigned long value1,
- unsigned long value2)
- {
- switch (resource) {
- case H_SET_MODE_RESOURCE_SET_CIABR:
- if (!kvmppc_power8_compatible(vcpu))
- return H_P2;
- if (value2)
- return H_P4;
- if (mflags)
- return H_UNSUPPORTED_FLAG_START;
- /* Guests can't breakpoint the hypervisor */
- if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
- return H_P3;
- vcpu->arch.ciabr = value1;
- return H_SUCCESS;
- case H_SET_MODE_RESOURCE_SET_DAWR0:
- if (!kvmppc_power8_compatible(vcpu))
- return H_P2;
- if (!ppc_breakpoint_available())
- return H_P2;
- if (mflags)
- return H_UNSUPPORTED_FLAG_START;
- if (value2 & DABRX_HYP)
- return H_P4;
- vcpu->arch.dawr = value1;
- vcpu->arch.dawrx = value2;
- return H_SUCCESS;
- case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE:
- /* KVM does not support mflags=2 (AIL=2) */
- if (mflags != 0 && mflags != 3)
- return H_UNSUPPORTED_FLAG_START;
- return H_TOO_HARD;
- default:
- return H_TOO_HARD;
- }
- }
- /* Copy guest memory in place - must reside within a single memslot */
- static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from,
- unsigned long len)
- {
- struct kvm_memory_slot *to_memslot = NULL;
- struct kvm_memory_slot *from_memslot = NULL;
- unsigned long to_addr, from_addr;
- int r;
- /* Get HPA for from address */
- from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT);
- if (!from_memslot)
- return -EFAULT;
- if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages)
- << PAGE_SHIFT))
- return -EINVAL;
- from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT);
- if (kvm_is_error_hva(from_addr))
- return -EFAULT;
- from_addr |= (from & (PAGE_SIZE - 1));
- /* Get HPA for to address */
- to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT);
- if (!to_memslot)
- return -EFAULT;
- if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages)
- << PAGE_SHIFT))
- return -EINVAL;
- to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT);
- if (kvm_is_error_hva(to_addr))
- return -EFAULT;
- to_addr |= (to & (PAGE_SIZE - 1));
- /* Perform copy */
- r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr,
- len);
- if (r)
- return -EFAULT;
- mark_page_dirty(kvm, to >> PAGE_SHIFT);
- return 0;
- }
- static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags,
- unsigned long dest, unsigned long src)
- {
- u64 pg_sz = SZ_4K; /* 4K page size */
- u64 pg_mask = SZ_4K - 1;
- int ret;
- /* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */
- if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE |
- H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED))
- return H_PARAMETER;
- /* dest (and src if copy_page flag set) must be page aligned */
- if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask)))
- return H_PARAMETER;
- /* zero and/or copy the page as determined by the flags */
- if (flags & H_COPY_PAGE) {
- ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz);
- if (ret < 0)
- return H_PARAMETER;
- } else if (flags & H_ZERO_PAGE) {
- ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz);
- if (ret < 0)
- return H_PARAMETER;
- }
- /* We can ignore the remaining flags */
- return H_SUCCESS;
- }
- static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target)
- {
- struct kvmppc_vcore *vcore = target->arch.vcore;
- /*
- * We expect to have been called by the real mode handler
- * (kvmppc_rm_h_confer()) which would have directly returned
- * H_SUCCESS if the source vcore wasn't idle (e.g. if it may
- * have useful work to do and should not confer) so we don't
- * recheck that here.
- */
- spin_lock(&vcore->lock);
- if (target->arch.state == KVMPPC_VCPU_RUNNABLE &&
- vcore->vcore_state != VCORE_INACTIVE &&
- vcore->runner)
- target = vcore->runner;
- spin_unlock(&vcore->lock);
- return kvm_vcpu_yield_to(target);
- }
- static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
- {
- int yield_count = 0;
- struct lppaca *lppaca;
- spin_lock(&vcpu->arch.vpa_update_lock);
- lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr;
- if (lppaca)
- yield_count = be32_to_cpu(lppaca->yield_count);
- spin_unlock(&vcpu->arch.vpa_update_lock);
- return yield_count;
- }
- int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
- {
- unsigned long req = kvmppc_get_gpr(vcpu, 3);
- unsigned long target, ret = H_SUCCESS;
- int yield_count;
- struct kvm_vcpu *tvcpu;
- int idx, rc;
- if (req <= MAX_HCALL_OPCODE &&
- !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
- return RESUME_HOST;
- switch (req) {
- case H_CEDE:
- break;
- case H_PROD:
- target = kvmppc_get_gpr(vcpu, 4);
- tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
- if (!tvcpu) {
- ret = H_PARAMETER;
- break;
- }
- tvcpu->arch.prodded = 1;
- smp_mb();
- if (tvcpu->arch.ceded)
- kvmppc_fast_vcpu_kick_hv(tvcpu);
- break;
- case H_CONFER:
- target = kvmppc_get_gpr(vcpu, 4);
- if (target == -1)
- break;
- tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
- if (!tvcpu) {
- ret = H_PARAMETER;
- break;
- }
- yield_count = kvmppc_get_gpr(vcpu, 5);
- if (kvmppc_get_yield_count(tvcpu) != yield_count)
- break;
- kvm_arch_vcpu_yield_to(tvcpu);
- break;
- case H_REGISTER_VPA:
- ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
- kvmppc_get_gpr(vcpu, 5),
- kvmppc_get_gpr(vcpu, 6));
- break;
- case H_RTAS:
- if (list_empty(&vcpu->kvm->arch.rtas_tokens))
- return RESUME_HOST;
- idx = srcu_read_lock(&vcpu->kvm->srcu);
- rc = kvmppc_rtas_hcall(vcpu);
- srcu_read_unlock(&vcpu->kvm->srcu, idx);
- if (rc == -ENOENT)
- return RESUME_HOST;
- else if (rc == 0)
- break;
- /* Send the error out to userspace via KVM_RUN */
- return rc;
- case H_LOGICAL_CI_LOAD:
- ret = kvmppc_h_logical_ci_load(vcpu);
- if (ret == H_TOO_HARD)
- return RESUME_HOST;
- break;
- case H_LOGICAL_CI_STORE:
- ret = kvmppc_h_logical_ci_store(vcpu);
- if (ret == H_TOO_HARD)
- return RESUME_HOST;
- break;
- case H_SET_MODE:
- ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
- kvmppc_get_gpr(vcpu, 5),
- kvmppc_get_gpr(vcpu, 6),
- kvmppc_get_gpr(vcpu, 7));
- if (ret == H_TOO_HARD)
- return RESUME_HOST;
- break;
- case H_XIRR:
- case H_CPPR:
- case H_EOI:
- case H_IPI:
- case H_IPOLL:
- case H_XIRR_X:
- if (kvmppc_xics_enabled(vcpu)) {
- if (xics_on_xive()) {
- ret = H_NOT_AVAILABLE;
- return RESUME_GUEST;
- }
- ret = kvmppc_xics_hcall(vcpu, req);
- break;
- }
- return RESUME_HOST;
- case H_SET_DABR:
- ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4));
- break;
- case H_SET_XDABR:
- ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4),
- kvmppc_get_gpr(vcpu, 5));
- break;
- #ifdef CONFIG_SPAPR_TCE_IOMMU
- case H_GET_TCE:
- ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
- kvmppc_get_gpr(vcpu, 5));
- if (ret == H_TOO_HARD)
- return RESUME_HOST;
- break;
- case H_PUT_TCE:
- ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
- kvmppc_get_gpr(vcpu, 5),
- kvmppc_get_gpr(vcpu, 6));
- if (ret == H_TOO_HARD)
- return RESUME_HOST;
- break;
- case H_PUT_TCE_INDIRECT:
- ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4),
- kvmppc_get_gpr(vcpu, 5),
- kvmppc_get_gpr(vcpu, 6),
- kvmppc_get_gpr(vcpu, 7));
- if (ret == H_TOO_HARD)
- return RESUME_HOST;
- break;
- case H_STUFF_TCE:
- ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
- kvmppc_get_gpr(vcpu, 5),
- kvmppc_get_gpr(vcpu, 6),
- kvmppc_get_gpr(vcpu, 7));
- if (ret == H_TOO_HARD)
- return RESUME_HOST;
- break;
- #endif
- case H_RANDOM:
- if (!powernv_get_random_long(&vcpu->arch.regs.gpr[4]))
- ret = H_HARDWARE;
- break;
- case H_SET_PARTITION_TABLE:
- ret = H_FUNCTION;
- if (nesting_enabled(vcpu->kvm))
- ret = kvmhv_set_partition_table(vcpu);
- break;
- case H_ENTER_NESTED:
- ret = H_FUNCTION;
- if (!nesting_enabled(vcpu->kvm))
- break;
- ret = kvmhv_enter_nested_guest(vcpu);
- if (ret == H_INTERRUPT) {
- kvmppc_set_gpr(vcpu, 3, 0);
- vcpu->arch.hcall_needed = 0;
- return -EINTR;
- } else if (ret == H_TOO_HARD) {
- kvmppc_set_gpr(vcpu, 3, 0);
- vcpu->arch.hcall_needed = 0;
- return RESUME_HOST;
- }
- break;
- case H_TLB_INVALIDATE:
- ret = H_FUNCTION;
- if (nesting_enabled(vcpu->kvm))
- ret = kvmhv_do_nested_tlbie(vcpu);
- break;
- case H_COPY_TOFROM_GUEST:
- ret = H_FUNCTION;
- if (nesting_enabled(vcpu->kvm))
- ret = kvmhv_copy_tofrom_guest_nested(vcpu);
- break;
- case H_PAGE_INIT:
- ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4),
- kvmppc_get_gpr(vcpu, 5),
- kvmppc_get_gpr(vcpu, 6));
- break;
- case H_SVM_PAGE_IN:
- ret = H_UNSUPPORTED;
- if (kvmppc_get_srr1(vcpu) & MSR_S)
- ret = kvmppc_h_svm_page_in(vcpu->kvm,
- kvmppc_get_gpr(vcpu, 4),
- kvmppc_get_gpr(vcpu, 5),
- kvmppc_get_gpr(vcpu, 6));
- break;
- case H_SVM_PAGE_OUT:
- ret = H_UNSUPPORTED;
- if (kvmppc_get_srr1(vcpu) & MSR_S)
- ret = kvmppc_h_svm_page_out(vcpu->kvm,
- kvmppc_get_gpr(vcpu, 4),
- kvmppc_get_gpr(vcpu, 5),
- kvmppc_get_gpr(vcpu, 6));
- break;
- case H_SVM_INIT_START:
- ret = H_UNSUPPORTED;
- if (kvmppc_get_srr1(vcpu) & MSR_S)
- ret = kvmppc_h_svm_init_start(vcpu->kvm);
- break;
- case H_SVM_INIT_DONE:
- ret = H_UNSUPPORTED;
- if (kvmppc_get_srr1(vcpu) & MSR_S)
- ret = kvmppc_h_svm_init_done(vcpu->kvm);
- break;
- case H_SVM_INIT_ABORT:
- /*
- * Even if that call is made by the Ultravisor, the SSR1 value
- * is the guest context one, with the secure bit clear as it has
- * not yet been secured. So we can't check it here.
- * Instead the kvm->arch.secure_guest flag is checked inside
- * kvmppc_h_svm_init_abort().
- */
- ret = kvmppc_h_svm_init_abort(vcpu->kvm);
- break;
- default:
- return RESUME_HOST;
- }
- kvmppc_set_gpr(vcpu, 3, ret);
- vcpu->arch.hcall_needed = 0;
- return RESUME_GUEST;
- }
- /*
- * Handle H_CEDE in the nested virtualization case where we haven't
- * called the real-mode hcall handlers in book3s_hv_rmhandlers.S.
- * This has to be done early, not in kvmppc_pseries_do_hcall(), so
- * that the cede logic in kvmppc_run_single_vcpu() works properly.
- */
- static void kvmppc_nested_cede(struct kvm_vcpu *vcpu)
- {
- vcpu->arch.shregs.msr |= MSR_EE;
- vcpu->arch.ceded = 1;
- smp_mb();
- if (vcpu->arch.prodded) {
- vcpu->arch.prodded = 0;
- smp_mb();
- vcpu->arch.ceded = 0;
- }
- }
- static int kvmppc_hcall_impl_hv(unsigned long cmd)
- {
- switch (cmd) {
- case H_CEDE:
- case H_PROD:
- case H_CONFER:
- case H_REGISTER_VPA:
- case H_SET_MODE:
- case H_LOGICAL_CI_LOAD:
- case H_LOGICAL_CI_STORE:
- #ifdef CONFIG_KVM_XICS
- case H_XIRR:
- case H_CPPR:
- case H_EOI:
- case H_IPI:
- case H_IPOLL:
- case H_XIRR_X:
- #endif
- case H_PAGE_INIT:
- return 1;
- }
- /* See if it's in the real-mode table */
- return kvmppc_hcall_impl_hv_realmode(cmd);
- }
- static int kvmppc_emulate_debug_inst(struct kvm_vcpu *vcpu)
- {
- u32 last_inst;
- if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
- EMULATE_DONE) {
- /*
- * Fetch failed, so return to guest and
- * try executing it again.
- */
- return RESUME_GUEST;
- }
- if (last_inst == KVMPPC_INST_SW_BREAKPOINT) {
- vcpu->run->exit_reason = KVM_EXIT_DEBUG;
- vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu);
- return RESUME_HOST;
- } else {
- kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
- return RESUME_GUEST;
- }
- }
- static void do_nothing(void *x)
- {
- }
- static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu)
- {
- int thr, cpu, pcpu, nthreads;
- struct kvm_vcpu *v;
- unsigned long dpdes;
- nthreads = vcpu->kvm->arch.emul_smt_mode;
- dpdes = 0;
- cpu = vcpu->vcpu_id & ~(nthreads - 1);
- for (thr = 0; thr < nthreads; ++thr, ++cpu) {
- v = kvmppc_find_vcpu(vcpu->kvm, cpu);
- if (!v)
- continue;
- /*
- * If the vcpu is currently running on a physical cpu thread,
- * interrupt it in order to pull it out of the guest briefly,
- * which will update its vcore->dpdes value.
- */
- pcpu = READ_ONCE(v->cpu);
- if (pcpu >= 0)
- smp_call_function_single(pcpu, do_nothing, NULL, 1);
- if (kvmppc_doorbell_pending(v))
- dpdes |= 1 << thr;
- }
- return dpdes;
- }
- /*
- * On POWER9, emulate doorbell-related instructions in order to
- * give the guest the illusion of running on a multi-threaded core.
- * The instructions emulated are msgsndp, msgclrp, mfspr TIR,
- * and mfspr DPDES.
- */
- static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu)
- {
- u32 inst, rb, thr;
- unsigned long arg;
- struct kvm *kvm = vcpu->kvm;
- struct kvm_vcpu *tvcpu;
- if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst) != EMULATE_DONE)
- return RESUME_GUEST;
- if (get_op(inst) != 31)
- return EMULATE_FAIL;
- rb = get_rb(inst);
- thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1);
- switch (get_xop(inst)) {
- case OP_31_XOP_MSGSNDP:
- arg = kvmppc_get_gpr(vcpu, rb);
- if (((arg >> 27) & 0xf) != PPC_DBELL_SERVER)
- break;
- arg &= 0x3f;
- if (arg >= kvm->arch.emul_smt_mode)
- break;
- tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg);
- if (!tvcpu)
- break;
- if (!tvcpu->arch.doorbell_request) {
- tvcpu->arch.doorbell_request = 1;
- kvmppc_fast_vcpu_kick_hv(tvcpu);
- }
- break;
- case OP_31_XOP_MSGCLRP:
- arg = kvmppc_get_gpr(vcpu, rb);
- if (((arg >> 27) & 0xf) != PPC_DBELL_SERVER)
- break;
- vcpu->arch.vcore->dpdes = 0;
- vcpu->arch.doorbell_request = 0;
- break;
- case OP_31_XOP_MFSPR:
- switch (get_sprn(inst)) {
- case SPRN_TIR:
- arg = thr;
- break;
- case SPRN_DPDES:
- arg = kvmppc_read_dpdes(vcpu);
- break;
- default:
- return EMULATE_FAIL;
- }
- kvmppc_set_gpr(vcpu, get_rt(inst), arg);
- break;
- default:
- return EMULATE_FAIL;
- }
- kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);
- return RESUME_GUEST;
- }
- static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu,
- struct task_struct *tsk)
- {
- struct kvm_run *run = vcpu->run;
- int r = RESUME_HOST;
- vcpu->stat.sum_exits++;
- /*
- * This can happen if an interrupt occurs in the last stages
- * of guest entry or the first stages of guest exit (i.e. after
- * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
- * and before setting it to KVM_GUEST_MODE_HOST_HV).
- * That can happen due to a bug, or due to a machine check
- * occurring at just the wrong time.
- */
- if (vcpu->arch.shregs.msr & MSR_HV) {
- printk(KERN_EMERG "KVM trap in HV mode!\n");
- printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
- vcpu->arch.trap, kvmppc_get_pc(vcpu),
- vcpu->arch.shregs.msr);
- kvmppc_dump_regs(vcpu);
- run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
- run->hw.hardware_exit_reason = vcpu->arch.trap;
- return RESUME_HOST;
- }
- run->exit_reason = KVM_EXIT_UNKNOWN;
- run->ready_for_interrupt_injection = 1;
- switch (vcpu->arch.trap) {
- /* We're good on these - the host merely wanted to get our attention */
- case BOOK3S_INTERRUPT_HV_DECREMENTER:
- vcpu->stat.dec_exits++;
- r = RESUME_GUEST;
- break;
- case BOOK3S_INTERRUPT_EXTERNAL:
- case BOOK3S_INTERRUPT_H_DOORBELL:
- case BOOK3S_INTERRUPT_H_VIRT:
- vcpu->stat.ext_intr_exits++;
- r = RESUME_GUEST;
- break;
- /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
- case BOOK3S_INTERRUPT_HMI:
- case BOOK3S_INTERRUPT_PERFMON:
- case BOOK3S_INTERRUPT_SYSTEM_RESET:
- r = RESUME_GUEST;
- break;
- case BOOK3S_INTERRUPT_MACHINE_CHECK:
- /* Print the MCE event to host console. */
- machine_check_print_event_info(&vcpu->arch.mce_evt, false, true);
- /*
- * If the guest can do FWNMI, exit to userspace so it can
- * deliver a FWNMI to the guest.
- * Otherwise we synthesize a machine check for the guest
- * so that it knows that the machine check occurred.
- */
- if (!vcpu->kvm->arch.fwnmi_enabled) {
- ulong flags = vcpu->arch.shregs.msr & 0x083c0000;
- kvmppc_core_queue_machine_check(vcpu, flags);
- r = RESUME_GUEST;
- break;
- }
- /* Exit to guest with KVM_EXIT_NMI as exit reason */
- run->exit_reason = KVM_EXIT_NMI;
- run->hw.hardware_exit_reason = vcpu->arch.trap;
- /* Clear out the old NMI status from run->flags */
- run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK;
- /* Now set the NMI status */
- if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED)
- run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV;
- else
- run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV;
- r = RESUME_HOST;
- break;
- case BOOK3S_INTERRUPT_PROGRAM:
- {
- ulong flags;
- /*
- * Normally program interrupts are delivered directly
- * to the guest by the hardware, but we can get here
- * as a result of a hypervisor emulation interrupt
- * (e40) getting turned into a 700 by BML RTAS.
- */
- flags = vcpu->arch.shregs.msr & 0x1f0000ull;
- kvmppc_core_queue_program(vcpu, flags);
- r = RESUME_GUEST;
- break;
- }
- case BOOK3S_INTERRUPT_SYSCALL:
- {
- /* hcall - punt to userspace */
- int i;
- /* hypercall with MSR_PR has already been handled in rmode,
- * and never reaches here.
- */
- run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
- for (i = 0; i < 9; ++i)
- run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
- run->exit_reason = KVM_EXIT_PAPR_HCALL;
- vcpu->arch.hcall_needed = 1;
- r = RESUME_HOST;
- break;
- }
- /*
- * We get these next two if the guest accesses a page which it thinks
- * it has mapped but which is not actually present, either because
- * it is for an emulated I/O device or because the corresonding
- * host page has been paged out. Any other HDSI/HISI interrupts
- * have been handled already.
- */
- case BOOK3S_INTERRUPT_H_DATA_STORAGE:
- r = RESUME_PAGE_FAULT;
- break;
- case BOOK3S_INTERRUPT_H_INST_STORAGE:
- vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
- vcpu->arch.fault_dsisr = vcpu->arch.shregs.msr &
- DSISR_SRR1_MATCH_64S;
- if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
- vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
- r = RESUME_PAGE_FAULT;
- break;
- /*
- * This occurs if the guest executes an illegal instruction.
- * If the guest debug is disabled, generate a program interrupt
- * to the guest. If guest debug is enabled, we need to check
- * whether the instruction is a software breakpoint instruction.
- * Accordingly return to Guest or Host.
- */
- case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
- if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED)
- vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ?
- swab32(vcpu->arch.emul_inst) :
- vcpu->arch.emul_inst;
- if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
- r = kvmppc_emulate_debug_inst(vcpu);
- } else {
- kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
- r = RESUME_GUEST;
- }
- break;
- /*
- * This occurs if the guest (kernel or userspace), does something that
- * is prohibited by HFSCR.
- * On POWER9, this could be a doorbell instruction that we need
- * to emulate.
- * Otherwise, we just generate a program interrupt to the guest.
- */
- case BOOK3S_INTERRUPT_H_FAC_UNAVAIL:
- r = EMULATE_FAIL;
- if (((vcpu->arch.hfscr >> 56) == FSCR_MSGP_LG) &&
- cpu_has_feature(CPU_FTR_ARCH_300))
- r = kvmppc_emulate_doorbell_instr(vcpu);
- if (r == EMULATE_FAIL) {
- kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
- r = RESUME_GUEST;
- }
- break;
- #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
- case BOOK3S_INTERRUPT_HV_SOFTPATCH:
- /*
- * This occurs for various TM-related instructions that
- * we need to emulate on POWER9 DD2.2. We have already
- * handled the cases where the guest was in real-suspend
- * mode and was transitioning to transactional state.
- */
- r = kvmhv_p9_tm_emulation(vcpu);
- break;
- #endif
- case BOOK3S_INTERRUPT_HV_RM_HARD:
- r = RESUME_PASSTHROUGH;
- break;
- default:
- kvmppc_dump_regs(vcpu);
- printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
- vcpu->arch.trap, kvmppc_get_pc(vcpu),
- vcpu->arch.shregs.msr);
- run->hw.hardware_exit_reason = vcpu->arch.trap;
- r = RESUME_HOST;
- break;
- }
- return r;
- }
- static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu)
- {
- int r;
- int srcu_idx;
- vcpu->stat.sum_exits++;
- /*
- * This can happen if an interrupt occurs in the last stages
- * of guest entry or the first stages of guest exit (i.e. after
- * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
- * and before setting it to KVM_GUEST_MODE_HOST_HV).
- * That can happen due to a bug, or due to a machine check
- * occurring at just the wrong time.
- */
- if (vcpu->arch.shregs.msr & MSR_HV) {
- pr_emerg("KVM trap in HV mode while nested!\n");
- pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n",
- vcpu->arch.trap, kvmppc_get_pc(vcpu),
- vcpu->arch.shregs.msr);
- kvmppc_dump_regs(vcpu);
- return RESUME_HOST;
- }
- switch (vcpu->arch.trap) {
- /* We're good on these - the host merely wanted to get our attention */
- case BOOK3S_INTERRUPT_HV_DECREMENTER:
- vcpu->stat.dec_exits++;
- r = RESUME_GUEST;
- break;
- case BOOK3S_INTERRUPT_EXTERNAL:
- vcpu->stat.ext_intr_exits++;
- r = RESUME_HOST;
- break;
- case BOOK3S_INTERRUPT_H_DOORBELL:
- case BOOK3S_INTERRUPT_H_VIRT:
- vcpu->stat.ext_intr_exits++;
- r = RESUME_GUEST;
- break;
- /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
- case BOOK3S_INTERRUPT_HMI:
- case BOOK3S_INTERRUPT_PERFMON:
- case BOOK3S_INTERRUPT_SYSTEM_RESET:
- r = RESUME_GUEST;
- break;
- case BOOK3S_INTERRUPT_MACHINE_CHECK:
- /* Pass the machine check to the L1 guest */
- r = RESUME_HOST;
- /* Print the MCE event to host console. */
- machine_check_print_event_info(&vcpu->arch.mce_evt, false, true);
- break;
- /*
- * We get these next two if the guest accesses a page which it thinks
- * it has mapped but which is not actually present, either because
- * it is for an emulated I/O device or because the corresonding
- * host page has been paged out.
- */
- case BOOK3S_INTERRUPT_H_DATA_STORAGE:
- srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
- r = kvmhv_nested_page_fault(vcpu);
- srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
- break;
- case BOOK3S_INTERRUPT_H_INST_STORAGE:
- vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
- vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) &
- DSISR_SRR1_MATCH_64S;
- if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
- vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
- srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
- r = kvmhv_nested_page_fault(vcpu);
- srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
- break;
- #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
- case BOOK3S_INTERRUPT_HV_SOFTPATCH:
- /*
- * This occurs for various TM-related instructions that
- * we need to emulate on POWER9 DD2.2. We have already
- * handled the cases where the guest was in real-suspend
- * mode and was transitioning to transactional state.
- */
- r = kvmhv_p9_tm_emulation(vcpu);
- break;
- #endif
- case BOOK3S_INTERRUPT_HV_RM_HARD:
- vcpu->arch.trap = 0;
- r = RESUME_GUEST;
- if (!xics_on_xive())
- kvmppc_xics_rm_complete(vcpu, 0);
- break;
- default:
- r = RESUME_HOST;
- break;
- }
- return r;
- }
- static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
- struct kvm_sregs *sregs)
- {
- int i;
- memset(sregs, 0, sizeof(struct kvm_sregs));
- sregs->pvr = vcpu->arch.pvr;
- for (i = 0; i < vcpu->arch.slb_max; i++) {
- sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
- sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
- }
- return 0;
- }
- static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
- struct kvm_sregs *sregs)
- {
- int i, j;
- /* Only accept the same PVR as the host's, since we can't spoof it */
- if (sregs->pvr != vcpu->arch.pvr)
- return -EINVAL;
- j = 0;
- for (i = 0; i < vcpu->arch.slb_nr; i++) {
- if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
- vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
- vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
- ++j;
- }
- }
- vcpu->arch.slb_max = j;
- return 0;
- }
- static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
- bool preserve_top32)
- {
- struct kvm *kvm = vcpu->kvm;
- struct kvmppc_vcore *vc = vcpu->arch.vcore;
- u64 mask;
- spin_lock(&vc->lock);
- /*
- * If ILE (interrupt little-endian) has changed, update the
- * MSR_LE bit in the intr_msr for each vcpu in this vcore.
- */
- if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
- struct kvm_vcpu *vcpu;
- int i;
- kvm_for_each_vcpu(i, vcpu, kvm) {
- if (vcpu->arch.vcore != vc)
- continue;
- if (new_lpcr & LPCR_ILE)
- vcpu->arch.intr_msr |= MSR_LE;
- else
- vcpu->arch.intr_msr &= ~MSR_LE;
- }
- }
- /*
- * Userspace can only modify DPFD (default prefetch depth),
- * ILE (interrupt little-endian) and TC (translation control).
- * On POWER8 and POWER9 userspace can also modify AIL (alt. interrupt loc.).
- */
- mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
- if (cpu_has_feature(CPU_FTR_ARCH_207S))
- mask |= LPCR_AIL;
- /*
- * On POWER9, allow userspace to enable large decrementer for the
- * guest, whether or not the host has it enabled.
- */
- if (cpu_has_feature(CPU_FTR_ARCH_300))
- mask |= LPCR_LD;
- /* Broken 32-bit version of LPCR must not clear top bits */
- if (preserve_top32)
- mask &= 0xFFFFFFFF;
- vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
- spin_unlock(&vc->lock);
- }
- static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
- union kvmppc_one_reg *val)
- {
- int r = 0;
- long int i;
- switch (id) {
- case KVM_REG_PPC_DEBUG_INST:
- *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
- break;
- case KVM_REG_PPC_HIOR:
- *val = get_reg_val(id, 0);
- break;
- case KVM_REG_PPC_DABR:
- *val = get_reg_val(id, vcpu->arch.dabr);
- break;
- case KVM_REG_PPC_DABRX:
- *val = get_reg_val(id, vcpu->arch.dabrx);
- break;
- case KVM_REG_PPC_DSCR:
- *val = get_reg_val(id, vcpu->arch.dscr);
- break;
- case KVM_REG_PPC_PURR:
- *val = get_reg_val(id, vcpu->arch.purr);
- break;
- case KVM_REG_PPC_SPURR:
- *val = get_reg_val(id, vcpu->arch.spurr);
- break;
- case KVM_REG_PPC_AMR:
- *val = get_reg_val(id, vcpu->arch.amr);
- break;
- case KVM_REG_PPC_UAMOR:
- *val = get_reg_val(id, vcpu->arch.uamor);
- break;
- case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1:
- i = id - KVM_REG_PPC_MMCR0;
- *val = get_reg_val(id, vcpu->arch.mmcr[i]);
- break;
- case KVM_REG_PPC_MMCR2:
- *val = get_reg_val(id, vcpu->arch.mmcr[2]);
- break;
- case KVM_REG_PPC_MMCRA:
- *val = get_reg_val(id, vcpu->arch.mmcra);
- break;
- case KVM_REG_PPC_MMCRS:
- *val = get_reg_val(id, vcpu->arch.mmcrs);
- break;
- case KVM_REG_PPC_MMCR3:
- *val = get_reg_val(id, vcpu->arch.mmcr[3]);
- break;
- case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
- i = id - KVM_REG_PPC_PMC1;
- *val = get_reg_val(id, vcpu->arch.pmc[i]);
- break;
- case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
- i = id - KVM_REG_PPC_SPMC1;
- *val = get_reg_val(id, vcpu->arch.spmc[i]);
- break;
- case KVM_REG_PPC_SIAR:
- *val = get_reg_val(id, vcpu->arch.siar);
- break;
- case KVM_REG_PPC_SDAR:
- *val = get_reg_val(id, vcpu->arch.sdar);
- break;
- case KVM_REG_PPC_SIER:
- *val = get_reg_val(id, vcpu->arch.sier[0]);
- break;
- case KVM_REG_PPC_SIER2:
- *val = get_reg_val(id, vcpu->arch.sier[1]);
- break;
- case KVM_REG_PPC_SIER3:
- *val = get_reg_val(id, vcpu->arch.sier[2]);
- break;
- case KVM_REG_PPC_IAMR:
- *val = get_reg_val(id, vcpu->arch.iamr);
- break;
- case KVM_REG_PPC_PSPB:
- *val = get_reg_val(id, vcpu->arch.pspb);
- break;
- case KVM_REG_PPC_DPDES:
- /*
- * On POWER9, where we are emulating msgsndp etc.,
- * we return 1 bit for each vcpu, which can come from
- * either vcore->dpdes or doorbell_request.
- * On POWER8, doorbell_request is 0.
- */
- *val = get_reg_val(id, vcpu->arch.vcore->dpdes |
- vcpu->arch.doorbell_request);
- break;
- case KVM_REG_PPC_VTB:
- *val = get_reg_val(id, vcpu->arch.vcore->vtb);
- break;
- case KVM_REG_PPC_DAWR:
- *val = get_reg_val(id, vcpu->arch.dawr);
- break;
- case KVM_REG_PPC_DAWRX:
- *val = get_reg_val(id, vcpu->arch.dawrx);
- break;
- case KVM_REG_PPC_CIABR:
- *val = get_reg_val(id, vcpu->arch.ciabr);
- break;
- case KVM_REG_PPC_CSIGR:
- *val = get_reg_val(id, vcpu->arch.csigr);
- break;
- case KVM_REG_PPC_TACR:
- *val = get_reg_val(id, vcpu->arch.tacr);
- break;
- case KVM_REG_PPC_TCSCR:
- *val = get_reg_val(id, vcpu->arch.tcscr);
- break;
- case KVM_REG_PPC_PID:
- *val = get_reg_val(id, vcpu->arch.pid);
- break;
- case KVM_REG_PPC_ACOP:
- *val = get_reg_val(id, vcpu->arch.acop);
- break;
- case KVM_REG_PPC_WORT:
- *val = get_reg_val(id, vcpu->arch.wort);
- break;
- case KVM_REG_PPC_TIDR:
- *val = get_reg_val(id, vcpu->arch.tid);
- break;
- case KVM_REG_PPC_PSSCR:
- *val = get_reg_val(id, vcpu->arch.psscr);
- break;
- case KVM_REG_PPC_VPA_ADDR:
- spin_lock(&vcpu->arch.vpa_update_lock);
- *val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
- spin_unlock(&vcpu->arch.vpa_update_lock);
- break;
- case KVM_REG_PPC_VPA_SLB:
- spin_lock(&vcpu->arch.vpa_update_lock);
- val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
- val->vpaval.length = vcpu->arch.slb_shadow.len;
- spin_unlock(&vcpu->arch.vpa_update_lock);
- break;
- case KVM_REG_PPC_VPA_DTL:
- spin_lock(&vcpu->arch.vpa_update_lock);
- val->vpaval.addr = vcpu->arch.dtl.next_gpa;
- val->vpaval.length = vcpu->arch.dtl.len;
- spin_unlock(&vcpu->arch.vpa_update_lock);
- break;
- case KVM_REG_PPC_TB_OFFSET:
- *val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
- break;
- case KVM_REG_PPC_LPCR:
- case KVM_REG_PPC_LPCR_64:
- *val = get_reg_val(id, vcpu->arch.vcore->lpcr);
- break;
- case KVM_REG_PPC_PPR:
- *val = get_reg_val(id, vcpu->arch.ppr);
- break;
- #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
- case KVM_REG_PPC_TFHAR:
- *val = get_reg_val(id, vcpu->arch.tfhar);
- break;
- case KVM_REG_PPC_TFIAR:
- *val = get_reg_val(id, vcpu->arch.tfiar);
- break;
- case KVM_REG_PPC_TEXASR:
- *val = get_reg_val(id, vcpu->arch.texasr);
- break;
- case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
- i = id - KVM_REG_PPC_TM_GPR0;
- *val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
- break;
- case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
- {
- int j;
- i = id - KVM_REG_PPC_TM_VSR0;
- if (i < 32)
- for (j = 0; j < TS_FPRWIDTH; j++)
- val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
- else {
- if (cpu_has_feature(CPU_FTR_ALTIVEC))
- val->vval = vcpu->arch.vr_tm.vr[i-32];
- else
- r = -ENXIO;
- }
- break;
- }
- case KVM_REG_PPC_TM_CR:
- *val = get_reg_val(id, vcpu->arch.cr_tm);
- break;
- case KVM_REG_PPC_TM_XER:
- *val = get_reg_val(id, vcpu->arch.xer_tm);
- break;
- case KVM_REG_PPC_TM_LR:
- *val = get_reg_val(id, vcpu->arch.lr_tm);
- break;
- case KVM_REG_PPC_TM_CTR:
- *val = get_reg_val(id, vcpu->arch.ctr_tm);
- break;
- case KVM_REG_PPC_TM_FPSCR:
- *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
- break;
- case KVM_REG_PPC_TM_AMR:
- *val = get_reg_val(id, vcpu->arch.amr_tm);
- break;
- case KVM_REG_PPC_TM_PPR:
- *val = get_reg_val(id, vcpu->arch.ppr_tm);
- break;
- case KVM_REG_PPC_TM_VRSAVE:
- *val = get_reg_val(id, vcpu->arch.vrsave_tm);
- break;
- case KVM_REG_PPC_TM_VSCR:
- if (cpu_has_feature(CPU_FTR_ALTIVEC))
- *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
- else
- r = -ENXIO;
- break;
- case KVM_REG_PPC_TM_DSCR:
- *val = get_reg_val(id, vcpu->arch.dscr_tm);
- break;
- case KVM_REG_PPC_TM_TAR:
- *val = get_reg_val(id, vcpu->arch.tar_tm);
- break;
- #endif
- case KVM_REG_PPC_ARCH_COMPAT:
- *val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
- break;
- case KVM_REG_PPC_DEC_EXPIRY:
- *val = get_reg_val(id, vcpu->arch.dec_expires +
- vcpu->arch.vcore->tb_offset);
- break;
- case KVM_REG_PPC_ONLINE:
- *val = get_reg_val(id, vcpu->arch.online);
- break;
- case KVM_REG_PPC_PTCR:
- *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr);
- break;
- default:
- r = -EINVAL;
- break;
- }
- return r;
- }
- static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
- union kvmppc_one_reg *val)
- {
- int r = 0;
- long int i;
- unsigned long addr, len;
- switch (id) {
- case KVM_REG_PPC_HIOR:
- /* Only allow this to be set to zero */
- if (set_reg_val(id, *val))
- r = -EINVAL;
- break;
- case KVM_REG_PPC_DABR:
- vcpu->arch.dabr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_DABRX:
- vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
- break;
- case KVM_REG_PPC_DSCR:
- vcpu->arch.dscr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_PURR:
- vcpu->arch.purr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_SPURR:
- vcpu->arch.spurr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_AMR:
- vcpu->arch.amr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_UAMOR:
- vcpu->arch.uamor = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1:
- i = id - KVM_REG_PPC_MMCR0;
- vcpu->arch.mmcr[i] = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_MMCR2:
- vcpu->arch.mmcr[2] = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_MMCRA:
- vcpu->arch.mmcra = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_MMCRS:
- vcpu->arch.mmcrs = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_MMCR3:
- *val = get_reg_val(id, vcpu->arch.mmcr[3]);
- break;
- case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
- i = id - KVM_REG_PPC_PMC1;
- vcpu->arch.pmc[i] = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
- i = id - KVM_REG_PPC_SPMC1;
- vcpu->arch.spmc[i] = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_SIAR:
- vcpu->arch.siar = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_SDAR:
- vcpu->arch.sdar = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_SIER:
- vcpu->arch.sier[0] = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_SIER2:
- vcpu->arch.sier[1] = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_SIER3:
- vcpu->arch.sier[2] = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_IAMR:
- vcpu->arch.iamr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_PSPB:
- vcpu->arch.pspb = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_DPDES:
- vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_VTB:
- vcpu->arch.vcore->vtb = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_DAWR:
- vcpu->arch.dawr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_DAWRX:
- vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP;
- break;
- case KVM_REG_PPC_CIABR:
- vcpu->arch.ciabr = set_reg_val(id, *val);
- /* Don't allow setting breakpoints in hypervisor code */
- if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
- vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */
- break;
- case KVM_REG_PPC_CSIGR:
- vcpu->arch.csigr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TACR:
- vcpu->arch.tacr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TCSCR:
- vcpu->arch.tcscr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_PID:
- vcpu->arch.pid = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_ACOP:
- vcpu->arch.acop = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_WORT:
- vcpu->arch.wort = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TIDR:
- vcpu->arch.tid = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_PSSCR:
- vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS;
- break;
- case KVM_REG_PPC_VPA_ADDR:
- addr = set_reg_val(id, *val);
- r = -EINVAL;
- if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
- vcpu->arch.dtl.next_gpa))
- break;
- r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
- break;
- case KVM_REG_PPC_VPA_SLB:
- addr = val->vpaval.addr;
- len = val->vpaval.length;
- r = -EINVAL;
- if (addr && !vcpu->arch.vpa.next_gpa)
- break;
- r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
- break;
- case KVM_REG_PPC_VPA_DTL:
- addr = val->vpaval.addr;
- len = val->vpaval.length;
- r = -EINVAL;
- if (addr && (len < sizeof(struct dtl_entry) ||
- !vcpu->arch.vpa.next_gpa))
- break;
- len -= len % sizeof(struct dtl_entry);
- r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
- break;
- case KVM_REG_PPC_TB_OFFSET:
- /* round up to multiple of 2^24 */
- vcpu->arch.vcore->tb_offset =
- ALIGN(set_reg_val(id, *val), 1UL << 24);
- break;
- case KVM_REG_PPC_LPCR:
- kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
- break;
- case KVM_REG_PPC_LPCR_64:
- kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
- break;
- case KVM_REG_PPC_PPR:
- vcpu->arch.ppr = set_reg_val(id, *val);
- break;
- #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
- case KVM_REG_PPC_TFHAR:
- vcpu->arch.tfhar = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TFIAR:
- vcpu->arch.tfiar = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TEXASR:
- vcpu->arch.texasr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
- i = id - KVM_REG_PPC_TM_GPR0;
- vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
- {
- int j;
- i = id - KVM_REG_PPC_TM_VSR0;
- if (i < 32)
- for (j = 0; j < TS_FPRWIDTH; j++)
- vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
- else
- if (cpu_has_feature(CPU_FTR_ALTIVEC))
- vcpu->arch.vr_tm.vr[i-32] = val->vval;
- else
- r = -ENXIO;
- break;
- }
- case KVM_REG_PPC_TM_CR:
- vcpu->arch.cr_tm = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_XER:
- vcpu->arch.xer_tm = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_LR:
- vcpu->arch.lr_tm = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_CTR:
- vcpu->arch.ctr_tm = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_FPSCR:
- vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_AMR:
- vcpu->arch.amr_tm = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_PPR:
- vcpu->arch.ppr_tm = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_VRSAVE:
- vcpu->arch.vrsave_tm = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_VSCR:
- if (cpu_has_feature(CPU_FTR_ALTIVEC))
- vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
- else
- r = - ENXIO;
- break;
- case KVM_REG_PPC_TM_DSCR:
- vcpu->arch.dscr_tm = set_reg_val(id, *val);
- break;
- case KVM_REG_PPC_TM_TAR:
- vcpu->arch.tar_tm = set_reg_val(id, *val);
- break;
- #endif
- case KVM_REG_PPC_ARCH_COMPAT:
- r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
- break;
- case KVM_REG_PPC_DEC_EXPIRY:
- vcpu->arch.dec_expires = set_reg_val(id, *val) -
- vcpu->arch.vcore->tb_offset;
- break;
- case KVM_REG_PPC_ONLINE:
- i = set_reg_val(id, *val);
- if (i && !vcpu->arch.online)
- atomic_inc(&vcpu->arch.vcore->online_count);
- else if (!i && vcpu->arch.online)
- atomic_dec(&vcpu->arch.vcore->online_count);
- vcpu->arch.online = i;
- break;
- case KVM_REG_PPC_PTCR:
- vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val);
- break;
- default:
- r = -EINVAL;
- break;
- }
- return r;
- }
- /*
- * On POWER9, threads are independent and can be in different partitions.
- * Therefore we consider each thread to be a subcore.
- * There is a restriction that all threads have to be in the same
- * MMU mode (radix or HPT), unfortunately, but since we only support
- * HPT guests on a HPT host so far, that isn't an impediment yet.
- */
- static int threads_per_vcore(struct kvm *kvm)
- {
- if (kvm->arch.threads_indep)
- return 1;
- return threads_per_subcore;
- }
- static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id)
- {
- struct kvmppc_vcore *vcore;
- vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
- if (vcore == NULL)
- return NULL;
- spin_lock_init(&vcore->lock);
- spin_lock_init(&vcore->stoltb_lock);
- rcuwait_init(&vcore->wait);
- vcore->preempt_tb = TB_NIL;
- vcore->lpcr = kvm->arch.lpcr;
- vcore->first_vcpuid = id;
- vcore->kvm = kvm;
- INIT_LIST_HEAD(&vcore->preempt_list);
- return vcore;
- }
- #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
- static struct debugfs_timings_element {
- const char *name;
- size_t offset;
- } timings[] = {
- {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)},
- {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)},
- {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)},
- {"guest", offsetof(struct kvm_vcpu, arch.guest_time)},
- {"cede", offsetof(struct kvm_vcpu, arch.cede_time)},
- };
- #define N_TIMINGS (ARRAY_SIZE(timings))
- struct debugfs_timings_state {
- struct kvm_vcpu *vcpu;
- unsigned int buflen;
- char buf[N_TIMINGS * 100];
- };
- static int debugfs_timings_open(struct inode *inode, struct file *file)
- {
- struct kvm_vcpu *vcpu = inode->i_private;
- struct debugfs_timings_state *p;
- p = kzalloc(sizeof(*p), GFP_KERNEL);
- if (!p)
- return -ENOMEM;
- kvm_get_kvm(vcpu->kvm);
- p->vcpu = vcpu;
- file->private_data = p;
- return nonseekable_open(inode, file);
- }
- static int debugfs_timings_release(struct inode *inode, struct file *file)
- {
- struct debugfs_timings_state *p = file->private_data;
- kvm_put_kvm(p->vcpu->kvm);
- kfree(p);
- return 0;
- }
- static ssize_t debugfs_timings_read(struct file *file, char __user *buf,
- size_t len, loff_t *ppos)
- {
- struct debugfs_timings_state *p = file->private_data;
- struct kvm_vcpu *vcpu = p->vcpu;
- char *s, *buf_end;
- struct kvmhv_tb_accumulator tb;
- u64 count;
- loff_t pos;
- ssize_t n;
- int i, loops;
- bool ok;
- if (!p->buflen) {
- s = p->buf;
- buf_end = s + sizeof(p->buf);
- for (i = 0; i < N_TIMINGS; ++i) {
- struct kvmhv_tb_accumulator *acc;
- acc = (struct kvmhv_tb_accumulator *)
- ((unsigned long)vcpu + timings[i].offset);
- ok = false;
- for (loops = 0; loops < 1000; ++loops) {
- count = acc->seqcount;
- if (!(count & 1)) {
- smp_rmb();
- tb = *acc;
- smp_rmb();
- if (count == acc->seqcount) {
- ok = true;
- break;
- }
- }
- udelay(1);
- }
- if (!ok)
- snprintf(s, buf_end - s, "%s: stuck\n",
- timings[i].name);
- else
- snprintf(s, buf_end - s,
- "%s: %llu %llu %llu %llu\n",
- timings[i].name, count / 2,
- tb_to_ns(tb.tb_total),
- tb_to_ns(tb.tb_min),
- tb_to_ns(tb.tb_max));
- s += strlen(s);
- }
- p->buflen = s - p->buf;
- }
- pos = *ppos;
- if (pos >= p->buflen)
- return 0;
- if (len > p->buflen - pos)
- len = p->buflen - pos;
- n = copy_to_user(buf, p->buf + pos, len);
- if (n) {
- if (n == len)
- return -EFAULT;
- len -= n;
- }
- *ppos = pos + len;
- return len;
- }
- static ssize_t debugfs_timings_write(struct file *file, const char __user *buf,
- size_t len, loff_t *ppos)
- {
- return -EACCES;
- }
- static const struct file_operations debugfs_timings_ops = {
- .owner = THIS_MODULE,
- .open = debugfs_timings_open,
- .release = debugfs_timings_release,
- .read = debugfs_timings_read,
- .write = debugfs_timings_write,
- .llseek = generic_file_llseek,
- };
- /* Create a debugfs directory for the vcpu */
- static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
- {
- char buf[16];
- struct kvm *kvm = vcpu->kvm;
- snprintf(buf, sizeof(buf), "vcpu%u", id);
- vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir);
- debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir, vcpu,
- &debugfs_timings_ops);
- }
- #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
- static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
- {
- }
- #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
- static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu)
- {
- int err;
- int core;
- struct kvmppc_vcore *vcore;
- struct kvm *kvm;
- unsigned int id;
- kvm = vcpu->kvm;
- id = vcpu->vcpu_id;
- vcpu->arch.shared = &vcpu->arch.shregs;
- #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
- /*
- * The shared struct is never shared on HV,
- * so we can always use host endianness
- */
- #ifdef __BIG_ENDIAN__
- vcpu->arch.shared_big_endian = true;
- #else
- vcpu->arch.shared_big_endian = false;
- #endif
- #endif
- vcpu->arch.mmcr[0] = MMCR0_FC;
- vcpu->arch.ctrl = CTRL_RUNLATCH;
- /* default to host PVR, since we can't spoof it */
- kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
- spin_lock_init(&vcpu->arch.vpa_update_lock);
- spin_lock_init(&vcpu->arch.tbacct_lock);
- vcpu->arch.busy_preempt = TB_NIL;
- vcpu->arch.intr_msr = MSR_SF | MSR_ME;
- /*
- * Set the default HFSCR for the guest from the host value.
- * This value is only used on POWER9.
- * On POWER9, we want to virtualize the doorbell facility, so we
- * don't set the HFSCR_MSGP bit, and that causes those instructions
- * to trap and then we emulate them.
- */
- vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB |
- HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP | HFSCR_PREFIX;
- if (cpu_has_feature(CPU_FTR_HVMODE)) {
- vcpu->arch.hfscr &= mfspr(SPRN_HFSCR);
- #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
- if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
- vcpu->arch.hfscr |= HFSCR_TM;
- #endif
- }
- if (cpu_has_feature(CPU_FTR_TM_COMP))
- vcpu->arch.hfscr |= HFSCR_TM;
- kvmppc_mmu_book3s_hv_init(vcpu);
- vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
- init_waitqueue_head(&vcpu->arch.cpu_run);
- mutex_lock(&kvm->lock);
- vcore = NULL;
- err = -EINVAL;
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) {
- pr_devel("KVM: VCPU ID too high\n");
- core = KVM_MAX_VCORES;
- } else {
- BUG_ON(kvm->arch.smt_mode != 1);
- core = kvmppc_pack_vcpu_id(kvm, id);
- }
- } else {
- core = id / kvm->arch.smt_mode;
- }
- if (core < KVM_MAX_VCORES) {
- vcore = kvm->arch.vcores[core];
- if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) {
- pr_devel("KVM: collision on id %u", id);
- vcore = NULL;
- } else if (!vcore) {
- /*
- * Take mmu_setup_lock for mutual exclusion
- * with kvmppc_update_lpcr().
- */
- err = -ENOMEM;
- vcore = kvmppc_vcore_create(kvm,
- id & ~(kvm->arch.smt_mode - 1));
- mutex_lock(&kvm->arch.mmu_setup_lock);
- kvm->arch.vcores[core] = vcore;
- kvm->arch.online_vcores++;
- mutex_unlock(&kvm->arch.mmu_setup_lock);
- }
- }
- mutex_unlock(&kvm->lock);
- if (!vcore)
- return err;
- spin_lock(&vcore->lock);
- ++vcore->num_threads;
- spin_unlock(&vcore->lock);
- vcpu->arch.vcore = vcore;
- vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
- vcpu->arch.thread_cpu = -1;
- vcpu->arch.prev_cpu = -1;
- vcpu->arch.cpu_type = KVM_CPU_3S_64;
- kvmppc_sanity_check(vcpu);
- debugfs_vcpu_init(vcpu, id);
- return 0;
- }
- static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode,
- unsigned long flags)
- {
- int err;
- int esmt = 0;
- if (flags)
- return -EINVAL;
- if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode))
- return -EINVAL;
- if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
- /*
- * On POWER8 (or POWER7), the threading mode is "strict",
- * so we pack smt_mode vcpus per vcore.
- */
- if (smt_mode > threads_per_subcore)
- return -EINVAL;
- } else {
- /*
- * On POWER9, the threading mode is "loose",
- * so each vcpu gets its own vcore.
- */
- esmt = smt_mode;
- smt_mode = 1;
- }
- mutex_lock(&kvm->lock);
- err = -EBUSY;
- if (!kvm->arch.online_vcores) {
- kvm->arch.smt_mode = smt_mode;
- kvm->arch.emul_smt_mode = esmt;
- err = 0;
- }
- mutex_unlock(&kvm->lock);
- return err;
- }
- static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
- {
- if (vpa->pinned_addr)
- kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
- vpa->dirty);
- }
- static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
- {
- spin_lock(&vcpu->arch.vpa_update_lock);
- unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
- unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
- unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
- spin_unlock(&vcpu->arch.vpa_update_lock);
- }
- static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
- {
- /* Indicate we want to get back into the guest */
- return 1;
- }
- static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
- {
- unsigned long dec_nsec, now;
- now = get_tb();
- if (now > vcpu->arch.dec_expires) {
- /* decrementer has already gone negative */
- kvmppc_core_queue_dec(vcpu);
- kvmppc_core_prepare_to_enter(vcpu);
- return;
- }
- dec_nsec = tb_to_ns(vcpu->arch.dec_expires - now);
- hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL);
- vcpu->arch.timer_running = 1;
- }
- extern int __kvmppc_vcore_entry(void);
- static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
- struct kvm_vcpu *vcpu)
- {
- u64 now;
- if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
- return;
- spin_lock_irq(&vcpu->arch.tbacct_lock);
- now = mftb();
- vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
- vcpu->arch.stolen_logged;
- vcpu->arch.busy_preempt = now;
- vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
- spin_unlock_irq(&vcpu->arch.tbacct_lock);
- --vc->n_runnable;
- WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL);
- }
- static int kvmppc_grab_hwthread(int cpu)
- {
- struct paca_struct *tpaca;
- long timeout = 10000;
- tpaca = paca_ptrs[cpu];
- /* Ensure the thread won't go into the kernel if it wakes */
- tpaca->kvm_hstate.kvm_vcpu = NULL;
- tpaca->kvm_hstate.kvm_vcore = NULL;
- tpaca->kvm_hstate.napping = 0;
- smp_wmb();
- tpaca->kvm_hstate.hwthread_req = 1;
- /*
- * If the thread is already executing in the kernel (e.g. handling
- * a stray interrupt), wait for it to get back to nap mode.
- * The smp_mb() is to ensure that our setting of hwthread_req
- * is visible before we look at hwthread_state, so if this
- * races with the code at system_reset_pSeries and the thread
- * misses our setting of hwthread_req, we are sure to see its
- * setting of hwthread_state, and vice versa.
- */
- smp_mb();
- while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
- if (--timeout <= 0) {
- pr_err("KVM: couldn't grab cpu %d\n", cpu);
- return -EBUSY;
- }
- udelay(1);
- }
- return 0;
- }
- static void kvmppc_release_hwthread(int cpu)
- {
- struct paca_struct *tpaca;
- tpaca = paca_ptrs[cpu];
- tpaca->kvm_hstate.hwthread_req = 0;
- tpaca->kvm_hstate.kvm_vcpu = NULL;
- tpaca->kvm_hstate.kvm_vcore = NULL;
- tpaca->kvm_hstate.kvm_split_mode = NULL;
- }
- static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu)
- {
- struct kvm_nested_guest *nested = vcpu->arch.nested;
- cpumask_t *cpu_in_guest;
- int i;
- cpu = cpu_first_tlb_thread_sibling(cpu);
- if (nested) {
- cpumask_set_cpu(cpu, &nested->need_tlb_flush);
- cpu_in_guest = &nested->cpu_in_guest;
- } else {
- cpumask_set_cpu(cpu, &kvm->arch.need_tlb_flush);
- cpu_in_guest = &kvm->arch.cpu_in_guest;
- }
- /*
- * Make sure setting of bit in need_tlb_flush precedes
- * testing of cpu_in_guest bits. The matching barrier on
- * the other side is the first smp_mb() in kvmppc_run_core().
- */
- smp_mb();
- for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu);
- i += cpu_tlb_thread_sibling_step())
- if (cpumask_test_cpu(i, cpu_in_guest))
- smp_call_function_single(i, do_nothing, NULL, 1);
- }
- static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu)
- {
- struct kvm_nested_guest *nested = vcpu->arch.nested;
- struct kvm *kvm = vcpu->kvm;
- int prev_cpu;
- if (!cpu_has_feature(CPU_FTR_HVMODE))
- return;
- if (nested)
- prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id];
- else
- prev_cpu = vcpu->arch.prev_cpu;
- /*
- * With radix, the guest can do TLB invalidations itself,
- * and it could choose to use the local form (tlbiel) if
- * it is invalidating a translation that has only ever been
- * used on one vcpu. However, that doesn't mean it has
- * only ever been used on one physical cpu, since vcpus
- * can move around between pcpus. To cope with this, when
- * a vcpu moves from one pcpu to another, we need to tell
- * any vcpus running on the same core as this vcpu previously
- * ran to flush the TLB. The TLB is shared between threads,
- * so we use a single bit in .need_tlb_flush for all 4 threads.
- */
- if (prev_cpu != pcpu) {
- if (prev_cpu >= 0 &&
- cpu_first_tlb_thread_sibling(prev_cpu) !=
- cpu_first_tlb_thread_sibling(pcpu))
- radix_flush_cpu(kvm, prev_cpu, vcpu);
- if (nested)
- nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu;
- else
- vcpu->arch.prev_cpu = pcpu;
- }
- }
- static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
- {
- int cpu;
- struct paca_struct *tpaca;
- struct kvm *kvm = vc->kvm;
- cpu = vc->pcpu;
- if (vcpu) {
- if (vcpu->arch.timer_running) {
- hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
- vcpu->arch.timer_running = 0;
- }
- cpu += vcpu->arch.ptid;
- vcpu->cpu = vc->pcpu;
- vcpu->arch.thread_cpu = cpu;
- cpumask_set_cpu(cpu, &kvm->arch.cpu_in_guest);
- }
- tpaca = paca_ptrs[cpu];
- tpaca->kvm_hstate.kvm_vcpu = vcpu;
- tpaca->kvm_hstate.ptid = cpu - vc->pcpu;
- tpaca->kvm_hstate.fake_suspend = 0;
- /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */
- smp_wmb();
- tpaca->kvm_hstate.kvm_vcore = vc;
- if (cpu != smp_processor_id())
- kvmppc_ipi_thread(cpu);
- }
- static void kvmppc_wait_for_nap(int n_threads)
- {
- int cpu = smp_processor_id();
- int i, loops;
- if (n_threads <= 1)
- return;
- for (loops = 0; loops < 1000000; ++loops) {
- /*
- * Check if all threads are finished.
- * We set the vcore pointer when starting a thread
- * and the thread clears it when finished, so we look
- * for any threads that still have a non-NULL vcore ptr.
- */
- for (i = 1; i < n_threads; ++i)
- if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
- break;
- if (i == n_threads) {
- HMT_medium();
- return;
- }
- HMT_low();
- }
- HMT_medium();
- for (i = 1; i < n_threads; ++i)
- if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
- pr_err("KVM: CPU %d seems to be stuck\n", cpu + i);
- }
- /*
- * Check that we are on thread 0 and that any other threads in
- * this core are off-line. Then grab the threads so they can't
- * enter the kernel.
- */
- static int on_primary_thread(void)
- {
- int cpu = smp_processor_id();
- int thr;
- /* Are we on a primary subcore? */
- if (cpu_thread_in_subcore(cpu))
- return 0;
- thr = 0;
- while (++thr < threads_per_subcore)
- if (cpu_online(cpu + thr))
- return 0;
- /* Grab all hw threads so they can't go into the kernel */
- for (thr = 1; thr < threads_per_subcore; ++thr) {
- if (kvmppc_grab_hwthread(cpu + thr)) {
- /* Couldn't grab one; let the others go */
- do {
- kvmppc_release_hwthread(cpu + thr);
- } while (--thr > 0);
- return 0;
- }
- }
- return 1;
- }
- /*
- * A list of virtual cores for each physical CPU.
- * These are vcores that could run but their runner VCPU tasks are
- * (or may be) preempted.
- */
- struct preempted_vcore_list {
- struct list_head list;
- spinlock_t lock;
- };
- static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores);
- static void init_vcore_lists(void)
- {
- int cpu;
- for_each_possible_cpu(cpu) {
- struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu);
- spin_lock_init(&lp->lock);
- INIT_LIST_HEAD(&lp->list);
- }
- }
- static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc)
- {
- struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
- vc->vcore_state = VCORE_PREEMPT;
- vc->pcpu = smp_processor_id();
- if (vc->num_threads < threads_per_vcore(vc->kvm)) {
- spin_lock(&lp->lock);
- list_add_tail(&vc->preempt_list, &lp->list);
- spin_unlock(&lp->lock);
- }
- /* Start accumulating stolen time */
- kvmppc_core_start_stolen(vc);
- }
- static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc)
- {
- struct preempted_vcore_list *lp;
- kvmppc_core_end_stolen(vc);
- if (!list_empty(&vc->preempt_list)) {
- lp = &per_cpu(preempted_vcores, vc->pcpu);
- spin_lock(&lp->lock);
- list_del_init(&vc->preempt_list);
- spin_unlock(&lp->lock);
- }
- vc->vcore_state = VCORE_INACTIVE;
- }
- /*
- * This stores information about the virtual cores currently
- * assigned to a physical core.
- */
- struct core_info {
- int n_subcores;
- int max_subcore_threads;
- int total_threads;
- int subcore_threads[MAX_SUBCORES];
- struct kvmppc_vcore *vc[MAX_SUBCORES];
- };
- /*
- * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7
- * respectively in 2-way micro-threading (split-core) mode on POWER8.
- */
- static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 };
- static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc)
- {
- memset(cip, 0, sizeof(*cip));
- cip->n_subcores = 1;
- cip->max_subcore_threads = vc->num_threads;
- cip->total_threads = vc->num_threads;
- cip->subcore_threads[0] = vc->num_threads;
- cip->vc[0] = vc;
- }
- static bool subcore_config_ok(int n_subcores, int n_threads)
- {
- /*
- * POWER9 "SMT4" cores are permanently in what is effectively a 4-way
- * split-core mode, with one thread per subcore.
- */
- if (cpu_has_feature(CPU_FTR_ARCH_300))
- return n_subcores <= 4 && n_threads == 1;
- /* On POWER8, can only dynamically split if unsplit to begin with */
- if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS)
- return false;
- if (n_subcores > MAX_SUBCORES)
- return false;
- if (n_subcores > 1) {
- if (!(dynamic_mt_modes & 2))
- n_subcores = 4;
- if (n_subcores > 2 && !(dynamic_mt_modes & 4))
- return false;
- }
- return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS;
- }
- static void init_vcore_to_run(struct kvmppc_vcore *vc)
- {
- vc->entry_exit_map = 0;
- vc->in_guest = 0;
- vc->napping_threads = 0;
- vc->conferring_threads = 0;
- vc->tb_offset_applied = 0;
- }
- static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip)
- {
- int n_threads = vc->num_threads;
- int sub;
- if (!cpu_has_feature(CPU_FTR_ARCH_207S))
- return false;
- /* In one_vm_per_core mode, require all vcores to be from the same vm */
- if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm)
- return false;
- /* Some POWER9 chips require all threads to be in the same MMU mode */
- if (no_mixing_hpt_and_radix &&
- kvm_is_radix(vc->kvm) != kvm_is_radix(cip->vc[0]->kvm))
- return false;
- if (n_threads < cip->max_subcore_threads)
- n_threads = cip->max_subcore_threads;
- if (!subcore_config_ok(cip->n_subcores + 1, n_threads))
- return false;
- cip->max_subcore_threads = n_threads;
- sub = cip->n_subcores;
- ++cip->n_subcores;
- cip->total_threads += vc->num_threads;
- cip->subcore_threads[sub] = vc->num_threads;
- cip->vc[sub] = vc;
- init_vcore_to_run(vc);
- list_del_init(&vc->preempt_list);
- return true;
- }
- /*
- * Work out whether it is possible to piggyback the execution of
- * vcore *pvc onto the execution of the other vcores described in *cip.
- */
- static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip,
- int target_threads)
- {
- if (cip->total_threads + pvc->num_threads > target_threads)
- return false;
- return can_dynamic_split(pvc, cip);
- }
- static void prepare_threads(struct kvmppc_vcore *vc)
- {
- int i;
- struct kvm_vcpu *vcpu;
- for_each_runnable_thread(i, vcpu, vc) {
- if (signal_pending(vcpu->arch.run_task))
- vcpu->arch.ret = -EINTR;
- else if (vcpu->arch.vpa.update_pending ||
- vcpu->arch.slb_shadow.update_pending ||
- vcpu->arch.dtl.update_pending)
- vcpu->arch.ret = RESUME_GUEST;
- else
- continue;
- kvmppc_remove_runnable(vc, vcpu);
- wake_up(&vcpu->arch.cpu_run);
- }
- }
- static void collect_piggybacks(struct core_info *cip, int target_threads)
- {
- struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
- struct kvmppc_vcore *pvc, *vcnext;
- spin_lock(&lp->lock);
- list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) {
- if (!spin_trylock(&pvc->lock))
- continue;
- prepare_threads(pvc);
- if (!pvc->n_runnable || !pvc->kvm->arch.mmu_ready) {
- list_del_init(&pvc->preempt_list);
- if (pvc->runner == NULL) {
- pvc->vcore_state = VCORE_INACTIVE;
- kvmppc_core_end_stolen(pvc);
- }
- spin_unlock(&pvc->lock);
- continue;
- }
- if (!can_piggyback(pvc, cip, target_threads)) {
- spin_unlock(&pvc->lock);
- continue;
- }
- kvmppc_core_end_stolen(pvc);
- pvc->vcore_state = VCORE_PIGGYBACK;
- if (cip->total_threads >= target_threads)
- break;
- }
- spin_unlock(&lp->lock);
- }
- static bool recheck_signals_and_mmu(struct core_info *cip)
- {
- int sub, i;
- struct kvm_vcpu *vcpu;
- struct kvmppc_vcore *vc;
- for (sub = 0; sub < cip->n_subcores; ++sub) {
- vc = cip->vc[sub];
- if (!vc->kvm->arch.mmu_ready)
- return true;
- for_each_runnable_thread(i, vcpu, vc)
- if (signal_pending(vcpu->arch.run_task))
- return true;
- }
- return false;
- }
- static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
- {
- int still_running = 0, i;
- u64 now;
- long ret;
- struct kvm_vcpu *vcpu;
- spin_lock(&vc->lock);
- now = get_tb();
- for_each_runnable_thread(i, vcpu, vc) {
- /*
- * It's safe to unlock the vcore in the loop here, because
- * for_each_runnable_thread() is safe against removal of
- * the vcpu, and the vcore state is VCORE_EXITING here,
- * so any vcpus becoming runnable will have their arch.trap
- * set to zero and can't actually run in the guest.
- */
- spin_unlock(&vc->lock);
- /* cancel pending dec exception if dec is positive */
- if (now < vcpu->arch.dec_expires &&
- kvmppc_core_pending_dec(vcpu))
- kvmppc_core_dequeue_dec(vcpu);
- trace_kvm_guest_exit(vcpu);
- ret = RESUME_GUEST;
- if (vcpu->arch.trap)
- ret = kvmppc_handle_exit_hv(vcpu,
- vcpu->arch.run_task);
- vcpu->arch.ret = ret;
- vcpu->arch.trap = 0;
- spin_lock(&vc->lock);
- if (is_kvmppc_resume_guest(vcpu->arch.ret)) {
- if (vcpu->arch.pending_exceptions)
- kvmppc_core_prepare_to_enter(vcpu);
- if (vcpu->arch.ceded)
- kvmppc_set_timer(vcpu);
- else
- ++still_running;
- } else {
- kvmppc_remove_runnable(vc, vcpu);
- wake_up(&vcpu->arch.cpu_run);
- }
- }
- if (!is_master) {
- if (still_running > 0) {
- kvmppc_vcore_preempt(vc);
- } else if (vc->runner) {
- vc->vcore_state = VCORE_PREEMPT;
- kvmppc_core_start_stolen(vc);
- } else {
- vc->vcore_state = VCORE_INACTIVE;
- }
- if (vc->n_runnable > 0 && vc->runner == NULL) {
- /* make sure there's a candidate runner awake */
- i = -1;
- vcpu = next_runnable_thread(vc, &i);
- wake_up(&vcpu->arch.cpu_run);
- }
- }
- spin_unlock(&vc->lock);
- }
- /*
- * Clear core from the list of active host cores as we are about to
- * enter the guest. Only do this if it is the primary thread of the
- * core (not if a subcore) that is entering the guest.
- */
- static inline int kvmppc_clear_host_core(unsigned int cpu)
- {
- int core;
- if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
- return 0;
- /*
- * Memory barrier can be omitted here as we will do a smp_wmb()
- * later in kvmppc_start_thread and we need ensure that state is
- * visible to other CPUs only after we enter guest.
- */
- core = cpu >> threads_shift;
- kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0;
- return 0;
- }
- /*
- * Advertise this core as an active host core since we exited the guest
- * Only need to do this if it is the primary thread of the core that is
- * exiting.
- */
- static inline int kvmppc_set_host_core(unsigned int cpu)
- {
- int core;
- if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
- return 0;
- /*
- * Memory barrier can be omitted here because we do a spin_unlock
- * immediately after this which provides the memory barrier.
- */
- core = cpu >> threads_shift;
- kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1;
- return 0;
- }
- static void set_irq_happened(int trap)
- {
- switch (trap) {
- case BOOK3S_INTERRUPT_EXTERNAL:
- local_paca->irq_happened |= PACA_IRQ_EE;
- break;
- case BOOK3S_INTERRUPT_H_DOORBELL:
- local_paca->irq_happened |= PACA_IRQ_DBELL;
- break;
- case BOOK3S_INTERRUPT_HMI:
- local_paca->irq_happened |= PACA_IRQ_HMI;
- break;
- case BOOK3S_INTERRUPT_SYSTEM_RESET:
- replay_system_reset();
- break;
- }
- }
- /*
- * Run a set of guest threads on a physical core.
- * Called with vc->lock held.
- */
- static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
- {
- struct kvm_vcpu *vcpu;
- int i;
- int srcu_idx;
- struct core_info core_info;
- struct kvmppc_vcore *pvc;
- struct kvm_split_mode split_info, *sip;
- int split, subcore_size, active;
- int sub;
- bool thr0_done;
- unsigned long cmd_bit, stat_bit;
- int pcpu, thr;
- int target_threads;
- int controlled_threads;
- int trap;
- bool is_power8;
- bool hpt_on_radix;
- /*
- * Remove from the list any threads that have a signal pending
- * or need a VPA update done
- */
- prepare_threads(vc);
- /* if the runner is no longer runnable, let the caller pick a new one */
- if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE)
- return;
- /*
- * Initialize *vc.
- */
- init_vcore_to_run(vc);
- vc->preempt_tb = TB_NIL;
- /*
- * Number of threads that we will be controlling: the same as
- * the number of threads per subcore, except on POWER9,
- * where it's 1 because the threads are (mostly) independent.
- */
- controlled_threads = threads_per_vcore(vc->kvm);
- /*
- * Make sure we are running on primary threads, and that secondary
- * threads are offline. Also check if the number of threads in this
- * guest are greater than the current system threads per guest.
- * On POWER9, we need to be not in independent-threads mode if
- * this is a HPT guest on a radix host machine where the
- * CPU threads may not be in different MMU modes.
- */
- hpt_on_radix = no_mixing_hpt_and_radix && radix_enabled() &&
- !kvm_is_radix(vc->kvm);
- if (((controlled_threads > 1) &&
- ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) ||
- (hpt_on_radix && vc->kvm->arch.threads_indep)) {
- for_each_runnable_thread(i, vcpu, vc) {
- vcpu->arch.ret = -EBUSY;
- kvmppc_remove_runnable(vc, vcpu);
- wake_up(&vcpu->arch.cpu_run);
- }
- goto out;
- }
- /*
- * See if we could run any other vcores on the physical core
- * along with this one.
- */
- init_core_info(&core_info, vc);
- pcpu = smp_processor_id();
- target_threads = controlled_threads;
- if (target_smt_mode && target_smt_mode < target_threads)
- target_threads = target_smt_mode;
- if (vc->num_threads < target_threads)
- collect_piggybacks(&core_info, target_threads);
- /*
- * On radix, arrange for TLB flushing if necessary.
- * This has to be done before disabling interrupts since
- * it uses smp_call_function().
- */
- pcpu = smp_processor_id();
- if (kvm_is_radix(vc->kvm)) {
- for (sub = 0; sub < core_info.n_subcores; ++sub)
- for_each_runnable_thread(i, vcpu, core_info.vc[sub])
- kvmppc_prepare_radix_vcpu(vcpu, pcpu);
- }
- /*
- * Hard-disable interrupts, and check resched flag and signals.
- * If we need to reschedule or deliver a signal, clean up
- * and return without going into the guest(s).
- * If the mmu_ready flag has been cleared, don't go into the
- * guest because that means a HPT resize operation is in progress.
- */
- local_irq_disable();
- hard_irq_disable();
- if (lazy_irq_pending() || need_resched() ||
- recheck_signals_and_mmu(&core_info)) {
- local_irq_enable();
- vc->vcore_state = VCORE_INACTIVE;
- /* Unlock all except the primary vcore */
- for (sub = 1; sub < core_info.n_subcores; ++sub) {
- pvc = core_info.vc[sub];
- /* Put back on to the preempted vcores list */
- kvmppc_vcore_preempt(pvc);
- spin_unlock(&pvc->lock);
- }
- for (i = 0; i < controlled_threads; ++i)
- kvmppc_release_hwthread(pcpu + i);
- return;
- }
- kvmppc_clear_host_core(pcpu);
- /* Decide on micro-threading (split-core) mode */
- subcore_size = threads_per_subcore;
- cmd_bit = stat_bit = 0;
- split = core_info.n_subcores;
- sip = NULL;
- is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S)
- && !cpu_has_feature(CPU_FTR_ARCH_300);
- if (split > 1 || hpt_on_radix) {
- sip = &split_info;
- memset(&split_info, 0, sizeof(split_info));
- for (sub = 0; sub < core_info.n_subcores; ++sub)
- split_info.vc[sub] = core_info.vc[sub];
- if (is_power8) {
- if (split == 2 && (dynamic_mt_modes & 2)) {
- cmd_bit = HID0_POWER8_1TO2LPAR;
- stat_bit = HID0_POWER8_2LPARMODE;
- } else {
- split = 4;
- cmd_bit = HID0_POWER8_1TO4LPAR;
- stat_bit = HID0_POWER8_4LPARMODE;
- }
- subcore_size = MAX_SMT_THREADS / split;
- split_info.rpr = mfspr(SPRN_RPR);
- split_info.pmmar = mfspr(SPRN_PMMAR);
- split_info.ldbar = mfspr(SPRN_LDBAR);
- split_info.subcore_size = subcore_size;
- } else {
- split_info.subcore_size = 1;
- if (hpt_on_radix) {
- /* Use the split_info for LPCR/LPIDR changes */
- split_info.lpcr_req = vc->lpcr;
- split_info.lpidr_req = vc->kvm->arch.lpid;
- split_info.host_lpcr = vc->kvm->arch.host_lpcr;
- split_info.do_set = 1;
- }
- }
- /* order writes to split_info before kvm_split_mode pointer */
- smp_wmb();
- }
- for (thr = 0; thr < controlled_threads; ++thr) {
- struct paca_struct *paca = paca_ptrs[pcpu + thr];
- paca->kvm_hstate.tid = thr;
- paca->kvm_hstate.napping = 0;
- paca->kvm_hstate.kvm_split_mode = sip;
- }
- /* Initiate micro-threading (split-core) on POWER8 if required */
- if (cmd_bit) {
- unsigned long hid0 = mfspr(SPRN_HID0);
- hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS;
- mb();
- mtspr(SPRN_HID0, hid0);
- isync();
- for (;;) {
- hid0 = mfspr(SPRN_HID0);
- if (hid0 & stat_bit)
- break;
- cpu_relax();
- }
- }
- /*
- * On POWER8, set RWMR register.
- * Since it only affects PURR and SPURR, it doesn't affect
- * the host, so we don't save/restore the host value.
- */
- if (is_power8) {
- unsigned long rwmr_val = RWMR_RPA_P8_8THREAD;
- int n_online = atomic_read(&vc->online_count);
- /*
- * Use the 8-thread value if we're doing split-core
- * or if the vcore's online count looks bogus.
- */
- if (split == 1 && threads_per_subcore == MAX_SMT_THREADS &&
- n_online >= 1 && n_online <= MAX_SMT_THREADS)
- rwmr_val = p8_rwmr_values[n_online];
- mtspr(SPRN_RWMR, rwmr_val);
- }
- /* Start all the threads */
- active = 0;
- for (sub = 0; sub < core_info.n_subcores; ++sub) {
- thr = is_power8 ? subcore_thread_map[sub] : sub;
- thr0_done = false;
- active |= 1 << thr;
- pvc = core_info.vc[sub];
- pvc->pcpu = pcpu + thr;
- for_each_runnable_thread(i, vcpu, pvc) {
- kvmppc_start_thread(vcpu, pvc);
- kvmppc_create_dtl_entry(vcpu, pvc);
- trace_kvm_guest_enter(vcpu);
- if (!vcpu->arch.ptid)
- thr0_done = true;
- active |= 1 << (thr + vcpu->arch.ptid);
- }
- /*
- * We need to start the first thread of each subcore
- * even if it doesn't have a vcpu.
- */
- if (!thr0_done)
- kvmppc_start_thread(NULL, pvc);
- }
- /*
- * Ensure that split_info.do_nap is set after setting
- * the vcore pointer in the PACA of the secondaries.
- */
- smp_mb();
- /*
- * When doing micro-threading, poke the inactive threads as well.
- * This gets them to the nap instruction after kvm_do_nap,
- * which reduces the time taken to unsplit later.
- * For POWER9 HPT guest on radix host, we need all the secondary
- * threads woken up so they can do the LPCR/LPIDR change.
- */
- if (cmd_bit || hpt_on_radix) {
- split_info.do_nap = 1; /* ask secondaries to nap when done */
- for (thr = 1; thr < threads_per_subcore; ++thr)
- if (!(active & (1 << thr)))
- kvmppc_ipi_thread(pcpu + thr);
- }
- vc->vcore_state = VCORE_RUNNING;
- preempt_disable();
- trace_kvmppc_run_core(vc, 0);
- for (sub = 0; sub < core_info.n_subcores; ++sub)
- spin_unlock(&core_info.vc[sub]->lock);
- guest_enter_irqoff();
- srcu_idx = srcu_read_lock(&vc->kvm->srcu);
- this_cpu_disable_ftrace();
- /*
- * Interrupts will be enabled once we get into the guest,
- * so tell lockdep that we're about to enable interrupts.
- */
- trace_hardirqs_on();
- trap = __kvmppc_vcore_entry();
- trace_hardirqs_off();
- this_cpu_enable_ftrace();
- srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
- set_irq_happened(trap);
- spin_lock(&vc->lock);
- /* prevent other vcpu threads from doing kvmppc_start_thread() now */
- vc->vcore_state = VCORE_EXITING;
- /* wait for secondary threads to finish writing their state to memory */
- kvmppc_wait_for_nap(controlled_threads);
- /* Return to whole-core mode if we split the core earlier */
- if (cmd_bit) {
- unsigned long hid0 = mfspr(SPRN_HID0);
- unsigned long loops = 0;
- hid0 &= ~HID0_POWER8_DYNLPARDIS;
- stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE;
- mb();
- mtspr(SPRN_HID0, hid0);
- isync();
- for (;;) {
- hid0 = mfspr(SPRN_HID0);
- if (!(hid0 & stat_bit))
- break;
- cpu_relax();
- ++loops;
- }
- } else if (hpt_on_radix) {
- /* Wait for all threads to have seen final sync */
- for (thr = 1; thr < controlled_threads; ++thr) {
- struct paca_struct *paca = paca_ptrs[pcpu + thr];
- while (paca->kvm_hstate.kvm_split_mode) {
- HMT_low();
- barrier();
- }
- HMT_medium();
- }
- }
- split_info.do_nap = 0;
- kvmppc_set_host_core(pcpu);
- local_irq_enable();
- guest_exit();
- /* Let secondaries go back to the offline loop */
- for (i = 0; i < controlled_threads; ++i) {
- kvmppc_release_hwthread(pcpu + i);
- if (sip && sip->napped[i])
- kvmppc_ipi_thread(pcpu + i);
- cpumask_clear_cpu(pcpu + i, &vc->kvm->arch.cpu_in_guest);
- }
- spin_unlock(&vc->lock);
- /* make sure updates to secondary vcpu structs are visible now */
- smp_mb();
- preempt_enable();
- for (sub = 0; sub < core_info.n_subcores; ++sub) {
- pvc = core_info.vc[sub];
- post_guest_process(pvc, pvc == vc);
- }
- spin_lock(&vc->lock);
- out:
- vc->vcore_state = VCORE_INACTIVE;
- trace_kvmppc_run_core(vc, 1);
- }
- /*
- * Load up hypervisor-mode registers on P9.
- */
- static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
- unsigned long lpcr)
- {
- struct kvmppc_vcore *vc = vcpu->arch.vcore;
- s64 hdec;
- u64 tb, purr, spurr;
- int trap;
- unsigned long host_hfscr = mfspr(SPRN_HFSCR);
- unsigned long host_ciabr = mfspr(SPRN_CIABR);
- unsigned long host_dawr = mfspr(SPRN_DAWR0);
- unsigned long host_dawrx = mfspr(SPRN_DAWRX0);
- unsigned long host_psscr = mfspr(SPRN_PSSCR);
- unsigned long host_pidr = mfspr(SPRN_PID);
- /*
- * P8 and P9 suppress the HDEC exception when LPCR[HDICE] = 0,
- * so set HDICE before writing HDEC.
- */
- mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr | LPCR_HDICE);
- isync();
- hdec = time_limit - mftb();
- if (hdec < 0) {
- mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr);
- isync();
- return BOOK3S_INTERRUPT_HV_DECREMENTER;
- }
- mtspr(SPRN_HDEC, hdec);
- if (vc->tb_offset) {
- u64 new_tb = mftb() + vc->tb_offset;
- mtspr(SPRN_TBU40, new_tb);
- tb = mftb();
- if ((tb & 0xffffff) < (new_tb & 0xffffff))
- mtspr(SPRN_TBU40, new_tb + 0x1000000);
- vc->tb_offset_applied = vc->tb_offset;
- }
- if (vc->pcr)
- mtspr(SPRN_PCR, vc->pcr | PCR_MASK);
- mtspr(SPRN_DPDES, vc->dpdes);
- mtspr(SPRN_VTB, vc->vtb);
- local_paca->kvm_hstate.host_purr = mfspr(SPRN_PURR);
- local_paca->kvm_hstate.host_spurr = mfspr(SPRN_SPURR);
- mtspr(SPRN_PURR, vcpu->arch.purr);
- mtspr(SPRN_SPURR, vcpu->arch.spurr);
- if (dawr_enabled()) {
- mtspr(SPRN_DAWR0, vcpu->arch.dawr);
- mtspr(SPRN_DAWRX0, vcpu->arch.dawrx);
- }
- mtspr(SPRN_CIABR, vcpu->arch.ciabr);
- mtspr(SPRN_IC, vcpu->arch.ic);
- mtspr(SPRN_PID, vcpu->arch.pid);
- mtspr(SPRN_PSSCR, vcpu->arch.psscr | PSSCR_EC |
- (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG));
- mtspr(SPRN_HFSCR, vcpu->arch.hfscr);
- mtspr(SPRN_SPRG0, vcpu->arch.shregs.sprg0);
- mtspr(SPRN_SPRG1, vcpu->arch.shregs.sprg1);
- mtspr(SPRN_SPRG2, vcpu->arch.shregs.sprg2);
- mtspr(SPRN_SPRG3, vcpu->arch.shregs.sprg3);
- mtspr(SPRN_AMOR, ~0UL);
- mtspr(SPRN_LPCR, lpcr);
- isync();
- kvmppc_xive_push_vcpu(vcpu);
- mtspr(SPRN_SRR0, vcpu->arch.shregs.srr0);
- mtspr(SPRN_SRR1, vcpu->arch.shregs.srr1);
- trap = __kvmhv_vcpu_entry_p9(vcpu);
- /* Advance host PURR/SPURR by the amount used by guest */
- purr = mfspr(SPRN_PURR);
- spurr = mfspr(SPRN_SPURR);
- mtspr(SPRN_PURR, local_paca->kvm_hstate.host_purr +
- purr - vcpu->arch.purr);
- mtspr(SPRN_SPURR, local_paca->kvm_hstate.host_spurr +
- spurr - vcpu->arch.spurr);
- vcpu->arch.purr = purr;
- vcpu->arch.spurr = spurr;
- vcpu->arch.ic = mfspr(SPRN_IC);
- vcpu->arch.pid = mfspr(SPRN_PID);
- vcpu->arch.psscr = mfspr(SPRN_PSSCR) & PSSCR_GUEST_VIS;
- vcpu->arch.shregs.sprg0 = mfspr(SPRN_SPRG0);
- vcpu->arch.shregs.sprg1 = mfspr(SPRN_SPRG1);
- vcpu->arch.shregs.sprg2 = mfspr(SPRN_SPRG2);
- vcpu->arch.shregs.sprg3 = mfspr(SPRN_SPRG3);
- /* Preserve PSSCR[FAKE_SUSPEND] until we've called kvmppc_save_tm_hv */
- mtspr(SPRN_PSSCR, host_psscr |
- (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG));
- mtspr(SPRN_HFSCR, host_hfscr);
- mtspr(SPRN_CIABR, host_ciabr);
- mtspr(SPRN_DAWR0, host_dawr);
- mtspr(SPRN_DAWRX0, host_dawrx);
- mtspr(SPRN_PID, host_pidr);
- /*
- * Since this is radix, do a eieio; tlbsync; ptesync sequence in
- * case we interrupted the guest between a tlbie and a ptesync.
- */
- asm volatile("eieio; tlbsync; ptesync");
- /*
- * cp_abort is required if the processor supports local copy-paste
- * to clear the copy buffer that was under control of the guest.
- */
- if (cpu_has_feature(CPU_FTR_ARCH_31))
- asm volatile(PPC_CP_ABORT);
- mtspr(SPRN_LPID, vcpu->kvm->arch.host_lpid); /* restore host LPID */
- isync();
- vc->dpdes = mfspr(SPRN_DPDES);
- vc->vtb = mfspr(SPRN_VTB);
- mtspr(SPRN_DPDES, 0);
- if (vc->pcr)
- mtspr(SPRN_PCR, PCR_MASK);
- if (vc->tb_offset_applied) {
- u64 new_tb = mftb() - vc->tb_offset_applied;
- mtspr(SPRN_TBU40, new_tb);
- tb = mftb();
- if ((tb & 0xffffff) < (new_tb & 0xffffff))
- mtspr(SPRN_TBU40, new_tb + 0x1000000);
- vc->tb_offset_applied = 0;
- }
- mtspr(SPRN_HDEC, 0x7fffffff);
- mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr);
- return trap;
- }
- /*
- * Virtual-mode guest entry for POWER9 and later when the host and
- * guest are both using the radix MMU. The LPIDR has already been set.
- */
- static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
- unsigned long lpcr)
- {
- struct kvmppc_vcore *vc = vcpu->arch.vcore;
- unsigned long host_dscr = mfspr(SPRN_DSCR);
- unsigned long host_tidr = mfspr(SPRN_TIDR);
- unsigned long host_iamr = mfspr(SPRN_IAMR);
- unsigned long host_amr = mfspr(SPRN_AMR);
- unsigned long host_fscr = mfspr(SPRN_FSCR);
- s64 dec;
- u64 tb;
- int trap, save_pmu;
- dec = mfspr(SPRN_DEC);
- tb = mftb();
- if (dec < 0)
- return BOOK3S_INTERRUPT_HV_DECREMENTER;
- local_paca->kvm_hstate.dec_expires = dec + tb;
- if (local_paca->kvm_hstate.dec_expires < time_limit)
- time_limit = local_paca->kvm_hstate.dec_expires;
- vcpu->arch.ceded = 0;
- kvmhv_save_host_pmu(); /* saves it to PACA kvm_hstate */
- kvmppc_subcore_enter_guest();
- vc->entry_exit_map = 1;
- vc->in_guest = 1;
- if (vcpu->arch.vpa.pinned_addr) {
- struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
- u32 yield_count = be32_to_cpu(lp->yield_count) + 1;
- lp->yield_count = cpu_to_be32(yield_count);
- vcpu->arch.vpa.dirty = 1;
- }
- if (cpu_has_feature(CPU_FTR_TM) ||
- cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
- kvmppc_restore_tm_hv(vcpu, vcpu->arch.shregs.msr, true);
- #ifdef CONFIG_PPC_PSERIES
- if (kvmhv_on_pseries()) {
- barrier();
- if (vcpu->arch.vpa.pinned_addr) {
- struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
- get_lppaca()->pmcregs_in_use = lp->pmcregs_in_use;
- } else {
- get_lppaca()->pmcregs_in_use = 1;
- }
- barrier();
- }
- #endif
- kvmhv_load_guest_pmu(vcpu);
- msr_check_and_set(MSR_FP | MSR_VEC | MSR_VSX);
- load_fp_state(&vcpu->arch.fp);
- #ifdef CONFIG_ALTIVEC
- load_vr_state(&vcpu->arch.vr);
- #endif
- mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
- mtspr(SPRN_DSCR, vcpu->arch.dscr);
- mtspr(SPRN_IAMR, vcpu->arch.iamr);
- mtspr(SPRN_PSPB, vcpu->arch.pspb);
- mtspr(SPRN_FSCR, vcpu->arch.fscr);
- mtspr(SPRN_TAR, vcpu->arch.tar);
- mtspr(SPRN_EBBHR, vcpu->arch.ebbhr);
- mtspr(SPRN_EBBRR, vcpu->arch.ebbrr);
- mtspr(SPRN_BESCR, vcpu->arch.bescr);
- mtspr(SPRN_WORT, vcpu->arch.wort);
- mtspr(SPRN_TIDR, vcpu->arch.tid);
- mtspr(SPRN_DAR, vcpu->arch.shregs.dar);
- mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr);
- mtspr(SPRN_AMR, vcpu->arch.amr);
- mtspr(SPRN_UAMOR, vcpu->arch.uamor);
- if (!(vcpu->arch.ctrl & 1))
- mtspr(SPRN_CTRLT, mfspr(SPRN_CTRLF) & ~1);
- mtspr(SPRN_DEC, vcpu->arch.dec_expires - mftb());
- if (kvmhv_on_pseries()) {
- /*
- * We need to save and restore the guest visible part of the
- * psscr (i.e. using SPRN_PSSCR_PR) since the hypervisor
- * doesn't do this for us. Note only required if pseries since
- * this is done in kvmhv_load_hv_regs_and_go() below otherwise.
- */
- unsigned long host_psscr;
- /* call our hypervisor to load up HV regs and go */
- struct hv_guest_state hvregs;
- host_psscr = mfspr(SPRN_PSSCR_PR);
- mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr);
- kvmhv_save_hv_regs(vcpu, &hvregs);
- hvregs.lpcr = lpcr;
- vcpu->arch.regs.msr = vcpu->arch.shregs.msr;
- hvregs.version = HV_GUEST_STATE_VERSION;
- if (vcpu->arch.nested) {
- hvregs.lpid = vcpu->arch.nested->shadow_lpid;
- hvregs.vcpu_token = vcpu->arch.nested_vcpu_id;
- } else {
- hvregs.lpid = vcpu->kvm->arch.lpid;
- hvregs.vcpu_token = vcpu->vcpu_id;
- }
- hvregs.hdec_expiry = time_limit;
- trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs),
- __pa(&vcpu->arch.regs));
- kvmhv_restore_hv_return_state(vcpu, &hvregs);
- vcpu->arch.shregs.msr = vcpu->arch.regs.msr;
- vcpu->arch.shregs.dar = mfspr(SPRN_DAR);
- vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR);
- vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR);
- mtspr(SPRN_PSSCR_PR, host_psscr);
- /* H_CEDE has to be handled now, not later */
- if (trap == BOOK3S_INTERRUPT_SYSCALL && !vcpu->arch.nested &&
- kvmppc_get_gpr(vcpu, 3) == H_CEDE) {
- kvmppc_nested_cede(vcpu);
- kvmppc_set_gpr(vcpu, 3, 0);
- trap = 0;
- }
- } else {
- trap = kvmhv_load_hv_regs_and_go(vcpu, time_limit, lpcr);
- }
- vcpu->arch.slb_max = 0;
- dec = mfspr(SPRN_DEC);
- if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */
- dec = (s32) dec;
- tb = mftb();
- vcpu->arch.dec_expires = dec + tb;
- vcpu->cpu = -1;
- vcpu->arch.thread_cpu = -1;
- /* Save guest CTRL register, set runlatch to 1 */
- vcpu->arch.ctrl = mfspr(SPRN_CTRLF);
- if (!(vcpu->arch.ctrl & 1))
- mtspr(SPRN_CTRLT, vcpu->arch.ctrl | 1);
- vcpu->arch.iamr = mfspr(SPRN_IAMR);
- vcpu->arch.pspb = mfspr(SPRN_PSPB);
- vcpu->arch.fscr = mfspr(SPRN_FSCR);
- vcpu->arch.tar = mfspr(SPRN_TAR);
- vcpu->arch.ebbhr = mfspr(SPRN_EBBHR);
- vcpu->arch.ebbrr = mfspr(SPRN_EBBRR);
- vcpu->arch.bescr = mfspr(SPRN_BESCR);
- vcpu->arch.wort = mfspr(SPRN_WORT);
- vcpu->arch.tid = mfspr(SPRN_TIDR);
- vcpu->arch.amr = mfspr(SPRN_AMR);
- vcpu->arch.uamor = mfspr(SPRN_UAMOR);
- vcpu->arch.dscr = mfspr(SPRN_DSCR);
- mtspr(SPRN_PSPB, 0);
- mtspr(SPRN_WORT, 0);
- mtspr(SPRN_UAMOR, 0);
- mtspr(SPRN_DSCR, host_dscr);
- mtspr(SPRN_TIDR, host_tidr);
- mtspr(SPRN_IAMR, host_iamr);
- mtspr(SPRN_PSPB, 0);
- if (host_amr != vcpu->arch.amr)
- mtspr(SPRN_AMR, host_amr);
- if (host_fscr != vcpu->arch.fscr)
- mtspr(SPRN_FSCR, host_fscr);
- msr_check_and_set(MSR_FP | MSR_VEC | MSR_VSX);
- store_fp_state(&vcpu->arch.fp);
- #ifdef CONFIG_ALTIVEC
- store_vr_state(&vcpu->arch.vr);
- #endif
- vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
- if (cpu_has_feature(CPU_FTR_TM) ||
- cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
- kvmppc_save_tm_hv(vcpu, vcpu->arch.shregs.msr, true);
- save_pmu = 1;
- if (vcpu->arch.vpa.pinned_addr) {
- struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
- u32 yield_count = be32_to_cpu(lp->yield_count) + 1;
- lp->yield_count = cpu_to_be32(yield_count);
- vcpu->arch.vpa.dirty = 1;
- save_pmu = lp->pmcregs_in_use;
- }
- /* Must save pmu if this guest is capable of running nested guests */
- save_pmu |= nesting_enabled(vcpu->kvm);
- kvmhv_save_guest_pmu(vcpu, save_pmu);
- #ifdef CONFIG_PPC_PSERIES
- if (kvmhv_on_pseries()) {
- barrier();
- get_lppaca()->pmcregs_in_use = ppc_get_pmu_inuse();
- barrier();
- }
- #endif
- vc->entry_exit_map = 0x101;
- vc->in_guest = 0;
- mtspr(SPRN_DEC, local_paca->kvm_hstate.dec_expires - mftb());
- mtspr(SPRN_SPRG_VDSO_WRITE, local_paca->sprg_vdso);
- kvmhv_load_host_pmu();
- kvmppc_subcore_exit_guest();
- return trap;
- }
- /*
- * Wait for some other vcpu thread to execute us, and
- * wake us up when we need to handle something in the host.
- */
- static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc,
- struct kvm_vcpu *vcpu, int wait_state)
- {
- DEFINE_WAIT(wait);
- prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
- if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
- spin_unlock(&vc->lock);
- schedule();
- spin_lock(&vc->lock);
- }
- finish_wait(&vcpu->arch.cpu_run, &wait);
- }
- static void grow_halt_poll_ns(struct kvmppc_vcore *vc)
- {
- if (!halt_poll_ns_grow)
- return;
- vc->halt_poll_ns *= halt_poll_ns_grow;
- if (vc->halt_poll_ns < halt_poll_ns_grow_start)
- vc->halt_poll_ns = halt_poll_ns_grow_start;
- }
- static void shrink_halt_poll_ns(struct kvmppc_vcore *vc)
- {
- if (halt_poll_ns_shrink == 0)
- vc->halt_poll_ns = 0;
- else
- vc->halt_poll_ns /= halt_poll_ns_shrink;
- }
- #ifdef CONFIG_KVM_XICS
- static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
- {
- if (!xics_on_xive())
- return false;
- return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr <
- vcpu->arch.xive_saved_state.cppr;
- }
- #else
- static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
- {
- return false;
- }
- #endif /* CONFIG_KVM_XICS */
- static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu)
- {
- if (vcpu->arch.pending_exceptions || vcpu->arch.prodded ||
- kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu))
- return true;
- return false;
- }
- /*
- * Check to see if any of the runnable vcpus on the vcore have pending
- * exceptions or are no longer ceded
- */
- static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc)
- {
- struct kvm_vcpu *vcpu;
- int i;
- for_each_runnable_thread(i, vcpu, vc) {
- if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu))
- return 1;
- }
- return 0;
- }
- /*
- * All the vcpus in this vcore are idle, so wait for a decrementer
- * or external interrupt to one of the vcpus. vc->lock is held.
- */
- static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
- {
- ktime_t cur, start_poll, start_wait;
- int do_sleep = 1;
- u64 block_ns;
- /* Poll for pending exceptions and ceded state */
- cur = start_poll = ktime_get();
- if (vc->halt_poll_ns) {
- ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
- ++vc->runner->stat.halt_attempted_poll;
- vc->vcore_state = VCORE_POLLING;
- spin_unlock(&vc->lock);
- do {
- if (kvmppc_vcore_check_block(vc)) {
- do_sleep = 0;
- break;
- }
- cur = ktime_get();
- } while (single_task_running() && ktime_before(cur, stop));
- spin_lock(&vc->lock);
- vc->vcore_state = VCORE_INACTIVE;
- if (!do_sleep) {
- ++vc->runner->stat.halt_successful_poll;
- goto out;
- }
- }
- prepare_to_rcuwait(&vc->wait);
- set_current_state(TASK_INTERRUPTIBLE);
- if (kvmppc_vcore_check_block(vc)) {
- finish_rcuwait(&vc->wait);
- do_sleep = 0;
- /* If we polled, count this as a successful poll */
- if (vc->halt_poll_ns)
- ++vc->runner->stat.halt_successful_poll;
- goto out;
- }
- start_wait = ktime_get();
- vc->vcore_state = VCORE_SLEEPING;
- trace_kvmppc_vcore_blocked(vc, 0);
- spin_unlock(&vc->lock);
- schedule();
- finish_rcuwait(&vc->wait);
- spin_lock(&vc->lock);
- vc->vcore_state = VCORE_INACTIVE;
- trace_kvmppc_vcore_blocked(vc, 1);
- ++vc->runner->stat.halt_successful_wait;
- cur = ktime_get();
- out:
- block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll);
- /* Attribute wait time */
- if (do_sleep) {
- vc->runner->stat.halt_wait_ns +=
- ktime_to_ns(cur) - ktime_to_ns(start_wait);
- /* Attribute failed poll time */
- if (vc->halt_poll_ns)
- vc->runner->stat.halt_poll_fail_ns +=
- ktime_to_ns(start_wait) -
- ktime_to_ns(start_poll);
- } else {
- /* Attribute successful poll time */
- if (vc->halt_poll_ns)
- vc->runner->stat.halt_poll_success_ns +=
- ktime_to_ns(cur) -
- ktime_to_ns(start_poll);
- }
- /* Adjust poll time */
- if (halt_poll_ns) {
- if (block_ns <= vc->halt_poll_ns)
- ;
- /* We slept and blocked for longer than the max halt time */
- else if (vc->halt_poll_ns && block_ns > halt_poll_ns)
- shrink_halt_poll_ns(vc);
- /* We slept and our poll time is too small */
- else if (vc->halt_poll_ns < halt_poll_ns &&
- block_ns < halt_poll_ns)
- grow_halt_poll_ns(vc);
- if (vc->halt_poll_ns > halt_poll_ns)
- vc->halt_poll_ns = halt_poll_ns;
- } else
- vc->halt_poll_ns = 0;
- trace_kvmppc_vcore_wakeup(do_sleep, block_ns);
- }
- /*
- * This never fails for a radix guest, as none of the operations it does
- * for a radix guest can fail or have a way to report failure.
- * kvmhv_run_single_vcpu() relies on this fact.
- */
- static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu)
- {
- int r = 0;
- struct kvm *kvm = vcpu->kvm;
- mutex_lock(&kvm->arch.mmu_setup_lock);
- if (!kvm->arch.mmu_ready) {
- if (!kvm_is_radix(kvm))
- r = kvmppc_hv_setup_htab_rma(vcpu);
- if (!r) {
- if (cpu_has_feature(CPU_FTR_ARCH_300))
- kvmppc_setup_partition_table(kvm);
- kvm->arch.mmu_ready = 1;
- }
- }
- mutex_unlock(&kvm->arch.mmu_setup_lock);
- return r;
- }
- static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu)
- {
- struct kvm_run *run = vcpu->run;
- int n_ceded, i, r;
- struct kvmppc_vcore *vc;
- struct kvm_vcpu *v;
- trace_kvmppc_run_vcpu_enter(vcpu);
- run->exit_reason = 0;
- vcpu->arch.ret = RESUME_GUEST;
- vcpu->arch.trap = 0;
- kvmppc_update_vpas(vcpu);
- /*
- * Synchronize with other threads in this virtual core
- */
- vc = vcpu->arch.vcore;
- spin_lock(&vc->lock);
- vcpu->arch.ceded = 0;
- vcpu->arch.run_task = current;
- vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
- vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
- vcpu->arch.busy_preempt = TB_NIL;
- WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu);
- ++vc->n_runnable;
- /*
- * This happens the first time this is called for a vcpu.
- * If the vcore is already running, we may be able to start
- * this thread straight away and have it join in.
- */
- if (!signal_pending(current)) {
- if ((vc->vcore_state == VCORE_PIGGYBACK ||
- vc->vcore_state == VCORE_RUNNING) &&
- !VCORE_IS_EXITING(vc)) {
- kvmppc_create_dtl_entry(vcpu, vc);
- kvmppc_start_thread(vcpu, vc);
- trace_kvm_guest_enter(vcpu);
- } else if (vc->vcore_state == VCORE_SLEEPING) {
- rcuwait_wake_up(&vc->wait);
- }
- }
- while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
- !signal_pending(current)) {
- /* See if the MMU is ready to go */
- if (!vcpu->kvm->arch.mmu_ready) {
- spin_unlock(&vc->lock);
- r = kvmhv_setup_mmu(vcpu);
- spin_lock(&vc->lock);
- if (r) {
- run->exit_reason = KVM_EXIT_FAIL_ENTRY;
- run->fail_entry.
- hardware_entry_failure_reason = 0;
- vcpu->arch.ret = r;
- break;
- }
- }
- if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
- kvmppc_vcore_end_preempt(vc);
- if (vc->vcore_state != VCORE_INACTIVE) {
- kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE);
- continue;
- }
- for_each_runnable_thread(i, v, vc) {
- kvmppc_core_prepare_to_enter(v);
- if (signal_pending(v->arch.run_task)) {
- kvmppc_remove_runnable(vc, v);
- v->stat.signal_exits++;
- v->run->exit_reason = KVM_EXIT_INTR;
- v->arch.ret = -EINTR;
- wake_up(&v->arch.cpu_run);
- }
- }
- if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
- break;
- n_ceded = 0;
- for_each_runnable_thread(i, v, vc) {
- if (!kvmppc_vcpu_woken(v))
- n_ceded += v->arch.ceded;
- else
- v->arch.ceded = 0;
- }
- vc->runner = vcpu;
- if (n_ceded == vc->n_runnable) {
- kvmppc_vcore_blocked(vc);
- } else if (need_resched()) {
- kvmppc_vcore_preempt(vc);
- /* Let something else run */
- cond_resched_lock(&vc->lock);
- if (vc->vcore_state == VCORE_PREEMPT)
- kvmppc_vcore_end_preempt(vc);
- } else {
- kvmppc_run_core(vc);
- }
- vc->runner = NULL;
- }
- while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
- (vc->vcore_state == VCORE_RUNNING ||
- vc->vcore_state == VCORE_EXITING ||
- vc->vcore_state == VCORE_PIGGYBACK))
- kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE);
- if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
- kvmppc_vcore_end_preempt(vc);
- if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
- kvmppc_remove_runnable(vc, vcpu);
- vcpu->stat.signal_exits++;
- run->exit_reason = KVM_EXIT_INTR;
- vcpu->arch.ret = -EINTR;
- }
- if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
- /* Wake up some vcpu to run the core */
- i = -1;
- v = next_runnable_thread(vc, &i);
- wake_up(&v->arch.cpu_run);
- }
- trace_kvmppc_run_vcpu_exit(vcpu);
- spin_unlock(&vc->lock);
- return vcpu->arch.ret;
- }
- int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
- unsigned long lpcr)
- {
- struct kvm_run *run = vcpu->run;
- int trap, r, pcpu;
- int srcu_idx, lpid;
- struct kvmppc_vcore *vc;
- struct kvm *kvm = vcpu->kvm;
- struct kvm_nested_guest *nested = vcpu->arch.nested;
- trace_kvmppc_run_vcpu_enter(vcpu);
- run->exit_reason = 0;
- vcpu->arch.ret = RESUME_GUEST;
- vcpu->arch.trap = 0;
- vc = vcpu->arch.vcore;
- vcpu->arch.ceded = 0;
- vcpu->arch.run_task = current;
- vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
- vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
- vcpu->arch.busy_preempt = TB_NIL;
- vcpu->arch.last_inst = KVM_INST_FETCH_FAILED;
- vc->runnable_threads[0] = vcpu;
- vc->n_runnable = 1;
- vc->runner = vcpu;
- /* See if the MMU is ready to go */
- if (!kvm->arch.mmu_ready)
- kvmhv_setup_mmu(vcpu);
- if (need_resched())
- cond_resched();
- kvmppc_update_vpas(vcpu);
- init_vcore_to_run(vc);
- vc->preempt_tb = TB_NIL;
- preempt_disable();
- pcpu = smp_processor_id();
- vc->pcpu = pcpu;
- kvmppc_prepare_radix_vcpu(vcpu, pcpu);
- local_irq_disable();
- hard_irq_disable();
- if (signal_pending(current))
- goto sigpend;
- if (lazy_irq_pending() || need_resched() || !kvm->arch.mmu_ready)
- goto out;
- if (!nested) {
- kvmppc_core_prepare_to_enter(vcpu);
- if (vcpu->arch.doorbell_request) {
- vc->dpdes = 1;
- smp_wmb();
- vcpu->arch.doorbell_request = 0;
- }
- if (test_bit(BOOK3S_IRQPRIO_EXTERNAL,
- &vcpu->arch.pending_exceptions))
- lpcr |= LPCR_MER;
- } else if (vcpu->arch.pending_exceptions ||
- vcpu->arch.doorbell_request ||
- xive_interrupt_pending(vcpu)) {
- vcpu->arch.ret = RESUME_HOST;
- goto out;
- }
- kvmppc_clear_host_core(pcpu);
- local_paca->kvm_hstate.tid = 0;
- local_paca->kvm_hstate.napping = 0;
- local_paca->kvm_hstate.kvm_split_mode = NULL;
- kvmppc_start_thread(vcpu, vc);
- kvmppc_create_dtl_entry(vcpu, vc);
- trace_kvm_guest_enter(vcpu);
- vc->vcore_state = VCORE_RUNNING;
- trace_kvmppc_run_core(vc, 0);
- if (cpu_has_feature(CPU_FTR_HVMODE)) {
- lpid = nested ? nested->shadow_lpid : kvm->arch.lpid;
- mtspr(SPRN_LPID, lpid);
- isync();
- kvmppc_check_need_tlb_flush(kvm, pcpu, nested);
- }
- guest_enter_irqoff();
- srcu_idx = srcu_read_lock(&kvm->srcu);
- this_cpu_disable_ftrace();
- /* Tell lockdep that we're about to enable interrupts */
- trace_hardirqs_on();
- trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr);
- vcpu->arch.trap = trap;
- trace_hardirqs_off();
- this_cpu_enable_ftrace();
- srcu_read_unlock(&kvm->srcu, srcu_idx);
- if (cpu_has_feature(CPU_FTR_HVMODE)) {
- mtspr(SPRN_LPID, kvm->arch.host_lpid);
- isync();
- }
- set_irq_happened(trap);
- kvmppc_set_host_core(pcpu);
- local_irq_enable();
- guest_exit();
- cpumask_clear_cpu(pcpu, &kvm->arch.cpu_in_guest);
- preempt_enable();
- /*
- * cancel pending decrementer exception if DEC is now positive, or if
- * entering a nested guest in which case the decrementer is now owned
- * by L2 and the L1 decrementer is provided in hdec_expires
- */
- if (kvmppc_core_pending_dec(vcpu) &&
- ((get_tb() < vcpu->arch.dec_expires) ||
- (trap == BOOK3S_INTERRUPT_SYSCALL &&
- kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED)))
- kvmppc_core_dequeue_dec(vcpu);
- trace_kvm_guest_exit(vcpu);
- r = RESUME_GUEST;
- if (trap) {
- if (!nested)
- r = kvmppc_handle_exit_hv(vcpu, current);
- else
- r = kvmppc_handle_nested_exit(vcpu);
- }
- vcpu->arch.ret = r;
- if (is_kvmppc_resume_guest(r) && vcpu->arch.ceded &&
- !kvmppc_vcpu_woken(vcpu)) {
- kvmppc_set_timer(vcpu);
- while (vcpu->arch.ceded && !kvmppc_vcpu_woken(vcpu)) {
- if (signal_pending(current)) {
- vcpu->stat.signal_exits++;
- run->exit_reason = KVM_EXIT_INTR;
- vcpu->arch.ret = -EINTR;
- break;
- }
- spin_lock(&vc->lock);
- kvmppc_vcore_blocked(vc);
- spin_unlock(&vc->lock);
- }
- }
- vcpu->arch.ceded = 0;
- vc->vcore_state = VCORE_INACTIVE;
- trace_kvmppc_run_core(vc, 1);
- done:
- kvmppc_remove_runnable(vc, vcpu);
- trace_kvmppc_run_vcpu_exit(vcpu);
- return vcpu->arch.ret;
- sigpend:
- vcpu->stat.signal_exits++;
- run->exit_reason = KVM_EXIT_INTR;
- vcpu->arch.ret = -EINTR;
- out:
- local_irq_enable();
- preempt_enable();
- goto done;
- }
- static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu)
- {
- struct kvm_run *run = vcpu->run;
- int r;
- int srcu_idx;
- unsigned long ebb_regs[3] = {}; /* shut up GCC */
- unsigned long user_tar = 0;
- unsigned int user_vrsave;
- struct kvm *kvm;
- if (!vcpu->arch.sane) {
- run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
- return -EINVAL;
- }
- /*
- * Don't allow entry with a suspended transaction, because
- * the guest entry/exit code will lose it.
- * If the guest has TM enabled, save away their TM-related SPRs
- * (they will get restored by the TM unavailable interrupt).
- */
- #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
- if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs &&
- (current->thread.regs->msr & MSR_TM)) {
- if (MSR_TM_ACTIVE(current->thread.regs->msr)) {
- run->exit_reason = KVM_EXIT_FAIL_ENTRY;
- run->fail_entry.hardware_entry_failure_reason = 0;
- return -EINVAL;
- }
- /* Enable TM so we can read the TM SPRs */
- mtmsr(mfmsr() | MSR_TM);
- current->thread.tm_tfhar = mfspr(SPRN_TFHAR);
- current->thread.tm_tfiar = mfspr(SPRN_TFIAR);
- current->thread.tm_texasr = mfspr(SPRN_TEXASR);
- current->thread.regs->msr &= ~MSR_TM;
- }
- #endif
- /*
- * Force online to 1 for the sake of old userspace which doesn't
- * set it.
- */
- if (!vcpu->arch.online) {
- atomic_inc(&vcpu->arch.vcore->online_count);
- vcpu->arch.online = 1;
- }
- kvmppc_core_prepare_to_enter(vcpu);
- /* No need to go into the guest when all we'll do is come back out */
- if (signal_pending(current)) {
- run->exit_reason = KVM_EXIT_INTR;
- return -EINTR;
- }
- kvm = vcpu->kvm;
- atomic_inc(&kvm->arch.vcpus_running);
- /* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */
- smp_mb();
- flush_all_to_thread(current);
- /* Save userspace EBB and other register values */
- if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
- ebb_regs[0] = mfspr(SPRN_EBBHR);
- ebb_regs[1] = mfspr(SPRN_EBBRR);
- ebb_regs[2] = mfspr(SPRN_BESCR);
- user_tar = mfspr(SPRN_TAR);
- }
- user_vrsave = mfspr(SPRN_VRSAVE);
- vcpu->arch.waitp = &vcpu->arch.vcore->wait;
- vcpu->arch.pgdir = kvm->mm->pgd;
- vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
- do {
- /*
- * The early POWER9 chips that can't mix radix and HPT threads
- * on the same core also need the workaround for the problem
- * where the TLB would prefetch entries in the guest exit path
- * for radix guests using the guest PIDR value and LPID 0.
- * The workaround is in the old path (kvmppc_run_vcpu())
- * but not the new path (kvmhv_run_single_vcpu()).
- */
- if (kvm->arch.threads_indep && kvm_is_radix(kvm) &&
- !no_mixing_hpt_and_radix)
- r = kvmhv_run_single_vcpu(vcpu, ~(u64)0,
- vcpu->arch.vcore->lpcr);
- else
- r = kvmppc_run_vcpu(vcpu);
- if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
- !(vcpu->arch.shregs.msr & MSR_PR)) {
- trace_kvm_hcall_enter(vcpu);
- r = kvmppc_pseries_do_hcall(vcpu);
- trace_kvm_hcall_exit(vcpu, r);
- kvmppc_core_prepare_to_enter(vcpu);
- } else if (r == RESUME_PAGE_FAULT) {
- srcu_idx = srcu_read_lock(&kvm->srcu);
- r = kvmppc_book3s_hv_page_fault(vcpu,
- vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
- srcu_read_unlock(&kvm->srcu, srcu_idx);
- } else if (r == RESUME_PASSTHROUGH) {
- if (WARN_ON(xics_on_xive()))
- r = H_SUCCESS;
- else
- r = kvmppc_xics_rm_complete(vcpu, 0);
- }
- } while (is_kvmppc_resume_guest(r));
- /* Restore userspace EBB and other register values */
- if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
- mtspr(SPRN_EBBHR, ebb_regs[0]);
- mtspr(SPRN_EBBRR, ebb_regs[1]);
- mtspr(SPRN_BESCR, ebb_regs[2]);
- mtspr(SPRN_TAR, user_tar);
- mtspr(SPRN_FSCR, current->thread.fscr);
- }
- mtspr(SPRN_VRSAVE, user_vrsave);
- vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
- atomic_dec(&kvm->arch.vcpus_running);
- return r;
- }
- static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
- int shift, int sllp)
- {
- (*sps)->page_shift = shift;
- (*sps)->slb_enc = sllp;
- (*sps)->enc[0].page_shift = shift;
- (*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift);
- /*
- * Add 16MB MPSS support (may get filtered out by userspace)
- */
- if (shift != 24) {
- int penc = kvmppc_pgsize_lp_encoding(shift, 24);
- if (penc != -1) {
- (*sps)->enc[1].page_shift = 24;
- (*sps)->enc[1].pte_enc = penc;
- }
- }
- (*sps)++;
- }
- static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
- struct kvm_ppc_smmu_info *info)
- {
- struct kvm_ppc_one_seg_page_size *sps;
- /*
- * POWER7, POWER8 and POWER9 all support 32 storage keys for data.
- * POWER7 doesn't support keys for instruction accesses,
- * POWER8 and POWER9 do.
- */
- info->data_keys = 32;
- info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0;
- /* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */
- info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS;
- info->slb_size = 32;
- /* We only support these sizes for now, and no muti-size segments */
- sps = &info->sps[0];
- kvmppc_add_seg_page_size(&sps, 12, 0);
- kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01);
- kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L);
- /* If running as a nested hypervisor, we don't support HPT guests */
- if (kvmhv_on_pseries())
- info->flags |= KVM_PPC_NO_HASH;
- return 0;
- }
- /*
- * Get (and clear) the dirty memory log for a memory slot.
- */
- static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
- struct kvm_dirty_log *log)
- {
- struct kvm_memslots *slots;
- struct kvm_memory_slot *memslot;
- int i, r;
- unsigned long n;
- unsigned long *buf, *p;
- struct kvm_vcpu *vcpu;
- mutex_lock(&kvm->slots_lock);
- r = -EINVAL;
- if (log->slot >= KVM_USER_MEM_SLOTS)
- goto out;
- slots = kvm_memslots(kvm);
- memslot = id_to_memslot(slots, log->slot);
- r = -ENOENT;
- if (!memslot || !memslot->dirty_bitmap)
- goto out;
- /*
- * Use second half of bitmap area because both HPT and radix
- * accumulate bits in the first half.
- */
- n = kvm_dirty_bitmap_bytes(memslot);
- buf = memslot->dirty_bitmap + n / sizeof(long);
- memset(buf, 0, n);
- if (kvm_is_radix(kvm))
- r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf);
- else
- r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf);
- if (r)
- goto out;
- /*
- * We accumulate dirty bits in the first half of the
- * memslot's dirty_bitmap area, for when pages are paged
- * out or modified by the host directly. Pick up these
- * bits and add them to the map.
- */
- p = memslot->dirty_bitmap;
- for (i = 0; i < n / sizeof(long); ++i)
- buf[i] |= xchg(&p[i], 0);
- /* Harvest dirty bits from VPA and DTL updates */
- /* Note: we never modify the SLB shadow buffer areas */
- kvm_for_each_vcpu(i, vcpu, kvm) {
- spin_lock(&vcpu->arch.vpa_update_lock);
- kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf);
- kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf);
- spin_unlock(&vcpu->arch.vpa_update_lock);
- }
- r = -EFAULT;
- if (copy_to_user(log->dirty_bitmap, buf, n))
- goto out;
- r = 0;
- out:
- mutex_unlock(&kvm->slots_lock);
- return r;
- }
- static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot)
- {
- vfree(slot->arch.rmap);
- slot->arch.rmap = NULL;
- }
- static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
- struct kvm_memory_slot *slot,
- const struct kvm_userspace_memory_region *mem,
- enum kvm_mr_change change)
- {
- unsigned long npages = mem->memory_size >> PAGE_SHIFT;
- if (change == KVM_MR_CREATE) {
- unsigned long size = array_size(npages, sizeof(*slot->arch.rmap));
- if ((size >> PAGE_SHIFT) > totalram_pages())
- return -ENOMEM;
- slot->arch.rmap = vzalloc(size);
- if (!slot->arch.rmap)
- return -ENOMEM;
- }
- return 0;
- }
- static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
- const struct kvm_userspace_memory_region *mem,
- const struct kvm_memory_slot *old,
- const struct kvm_memory_slot *new,
- enum kvm_mr_change change)
- {
- unsigned long npages = mem->memory_size >> PAGE_SHIFT;
- /*
- * If we are making a new memslot, it might make
- * some address that was previously cached as emulated
- * MMIO be no longer emulated MMIO, so invalidate
- * all the caches of emulated MMIO translations.
- */
- if (npages)
- atomic64_inc(&kvm->arch.mmio_update);
- /*
- * For change == KVM_MR_MOVE or KVM_MR_DELETE, higher levels
- * have already called kvm_arch_flush_shadow_memslot() to
- * flush shadow mappings. For KVM_MR_CREATE we have no
- * previous mappings. So the only case to handle is
- * KVM_MR_FLAGS_ONLY when the KVM_MEM_LOG_DIRTY_PAGES bit
- * has been changed.
- * For radix guests, we flush on setting KVM_MEM_LOG_DIRTY_PAGES
- * to get rid of any THP PTEs in the partition-scoped page tables
- * so we can track dirtiness at the page level; we flush when
- * clearing KVM_MEM_LOG_DIRTY_PAGES so that we can go back to
- * using THP PTEs.
- */
- if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) &&
- ((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES))
- kvmppc_radix_flush_memslot(kvm, old);
- /*
- * If UV hasn't yet called H_SVM_INIT_START, don't register memslots.
- */
- if (!kvm->arch.secure_guest)
- return;
- switch (change) {
- case KVM_MR_CREATE:
- /*
- * @TODO kvmppc_uvmem_memslot_create() can fail and
- * return error. Fix this.
- */
- kvmppc_uvmem_memslot_create(kvm, new);
- break;
- case KVM_MR_DELETE:
- kvmppc_uvmem_memslot_delete(kvm, old);
- break;
- default:
- /* TODO: Handle KVM_MR_MOVE */
- break;
- }
- }
- /*
- * Update LPCR values in kvm->arch and in vcores.
- * Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion
- * of kvm->arch.lpcr update).
- */
- void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
- {
- long int i;
- u32 cores_done = 0;
- if ((kvm->arch.lpcr & mask) == lpcr)
- return;
- kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
- for (i = 0; i < KVM_MAX_VCORES; ++i) {
- struct kvmppc_vcore *vc = kvm->arch.vcores[i];
- if (!vc)
- continue;
- spin_lock(&vc->lock);
- vc->lpcr = (vc->lpcr & ~mask) | lpcr;
- spin_unlock(&vc->lock);
- if (++cores_done >= kvm->arch.online_vcores)
- break;
- }
- }
- void kvmppc_setup_partition_table(struct kvm *kvm)
- {
- unsigned long dw0, dw1;
- if (!kvm_is_radix(kvm)) {
- /* PS field - page size for VRMA */
- dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) |
- ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1);
- /* HTABSIZE and HTABORG fields */
- dw0 |= kvm->arch.sdr1;
- /* Second dword as set by userspace */
- dw1 = kvm->arch.process_table;
- } else {
- dw0 = PATB_HR | radix__get_tree_size() |
- __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE;
- dw1 = PATB_GR | kvm->arch.process_table;
- }
- kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1);
- }
- /*
- * Set up HPT (hashed page table) and RMA (real-mode area).
- * Must be called with kvm->arch.mmu_setup_lock held.
- */
- static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
- {
- int err = 0;
- struct kvm *kvm = vcpu->kvm;
- unsigned long hva;
- struct kvm_memory_slot *memslot;
- struct vm_area_struct *vma;
- unsigned long lpcr = 0, senc;
- unsigned long psize, porder;
- int srcu_idx;
- /* Allocate hashed page table (if not done already) and reset it */
- if (!kvm->arch.hpt.virt) {
- int order = KVM_DEFAULT_HPT_ORDER;
- struct kvm_hpt_info info;
- err = kvmppc_allocate_hpt(&info, order);
- /* If we get here, it means userspace didn't specify a
- * size explicitly. So, try successively smaller
- * sizes if the default failed. */
- while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER)
- err = kvmppc_allocate_hpt(&info, order);
- if (err < 0) {
- pr_err("KVM: Couldn't alloc HPT\n");
- goto out;
- }
- kvmppc_set_hpt(kvm, &info);
- }
- /* Look up the memslot for guest physical address 0 */
- srcu_idx = srcu_read_lock(&kvm->srcu);
- memslot = gfn_to_memslot(kvm, 0);
- /* We must have some memory at 0 by now */
- err = -EINVAL;
- if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
- goto out_srcu;
- /* Look up the VMA for the start of this memory slot */
- hva = memslot->userspace_addr;
- mmap_read_lock(kvm->mm);
- vma = find_vma(kvm->mm, hva);
- if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
- goto up_out;
- psize = vma_kernel_pagesize(vma);
- mmap_read_unlock(kvm->mm);
- /* We can handle 4k, 64k or 16M pages in the VRMA */
- if (psize >= 0x1000000)
- psize = 0x1000000;
- else if (psize >= 0x10000)
- psize = 0x10000;
- else
- psize = 0x1000;
- porder = __ilog2(psize);
- senc = slb_pgsize_encoding(psize);
- kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
- (VRMA_VSID << SLB_VSID_SHIFT_1T);
- /* Create HPTEs in the hash page table for the VRMA */
- kvmppc_map_vrma(vcpu, memslot, porder);
- /* Update VRMASD field in the LPCR */
- if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
- /* the -4 is to account for senc values starting at 0x10 */
- lpcr = senc << (LPCR_VRMASD_SH - 4);
- kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
- }
- /* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */
- smp_wmb();
- err = 0;
- out_srcu:
- srcu_read_unlock(&kvm->srcu, srcu_idx);
- out:
- return err;
- up_out:
- mmap_read_unlock(kvm->mm);
- goto out_srcu;
- }
- /*
- * Must be called with kvm->arch.mmu_setup_lock held and
- * mmu_ready = 0 and no vcpus running.
- */
- int kvmppc_switch_mmu_to_hpt(struct kvm *kvm)
- {
- if (nesting_enabled(kvm))
- kvmhv_release_all_nested(kvm);
- kvmppc_rmap_reset(kvm);
- kvm->arch.process_table = 0;
- /* Mutual exclusion with kvm_unmap_hva_range etc. */
- spin_lock(&kvm->mmu_lock);
- kvm->arch.radix = 0;
- spin_unlock(&kvm->mmu_lock);
- kvmppc_free_radix(kvm);
- kvmppc_update_lpcr(kvm, LPCR_VPM1,
- LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR);
- return 0;
- }
- /*
- * Must be called with kvm->arch.mmu_setup_lock held and
- * mmu_ready = 0 and no vcpus running.
- */
- int kvmppc_switch_mmu_to_radix(struct kvm *kvm)
- {
- int err;
- err = kvmppc_init_vm_radix(kvm);
- if (err)
- return err;
- kvmppc_rmap_reset(kvm);
- /* Mutual exclusion with kvm_unmap_hva_range etc. */
- spin_lock(&kvm->mmu_lock);
- kvm->arch.radix = 1;
- spin_unlock(&kvm->mmu_lock);
- kvmppc_free_hpt(&kvm->arch.hpt);
- kvmppc_update_lpcr(kvm, LPCR_UPRT | LPCR_GTSE | LPCR_HR,
- LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR);
- return 0;
- }
- #ifdef CONFIG_KVM_XICS
- /*
- * Allocate a per-core structure for managing state about which cores are
- * running in the host versus the guest and for exchanging data between
- * real mode KVM and CPU running in the host.
- * This is only done for the first VM.
- * The allocated structure stays even if all VMs have stopped.
- * It is only freed when the kvm-hv module is unloaded.
- * It's OK for this routine to fail, we just don't support host
- * core operations like redirecting H_IPI wakeups.
- */
- void kvmppc_alloc_host_rm_ops(void)
- {
- struct kvmppc_host_rm_ops *ops;
- unsigned long l_ops;
- int cpu, core;
- int size;
- /* Not the first time here ? */
- if (kvmppc_host_rm_ops_hv != NULL)
- return;
- ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL);
- if (!ops)
- return;
- size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core);
- ops->rm_core = kzalloc(size, GFP_KERNEL);
- if (!ops->rm_core) {
- kfree(ops);
- return;
- }
- cpus_read_lock();
- for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) {
- if (!cpu_online(cpu))
- continue;
- core = cpu >> threads_shift;
- ops->rm_core[core].rm_state.in_host = 1;
- }
- ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv;
- /*
- * Make the contents of the kvmppc_host_rm_ops structure visible
- * to other CPUs before we assign it to the global variable.
- * Do an atomic assignment (no locks used here), but if someone
- * beats us to it, just free our copy and return.
- */
- smp_wmb();
- l_ops = (unsigned long) ops;
- if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) {
- cpus_read_unlock();
- kfree(ops->rm_core);
- kfree(ops);
- return;
- }
- cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE,
- "ppc/kvm_book3s:prepare",
- kvmppc_set_host_core,
- kvmppc_clear_host_core);
- cpus_read_unlock();
- }
- void kvmppc_free_host_rm_ops(void)
- {
- if (kvmppc_host_rm_ops_hv) {
- cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE);
- kfree(kvmppc_host_rm_ops_hv->rm_core);
- kfree(kvmppc_host_rm_ops_hv);
- kvmppc_host_rm_ops_hv = NULL;
- }
- }
- #endif
- static int kvmppc_core_init_vm_hv(struct kvm *kvm)
- {
- unsigned long lpcr, lpid;
- char buf[32];
- int ret;
- mutex_init(&kvm->arch.uvmem_lock);
- INIT_LIST_HEAD(&kvm->arch.uvmem_pfns);
- mutex_init(&kvm->arch.mmu_setup_lock);
- /* Allocate the guest's logical partition ID */
- lpid = kvmppc_alloc_lpid();
- if ((long)lpid < 0)
- return -ENOMEM;
- kvm->arch.lpid = lpid;
- kvmppc_alloc_host_rm_ops();
- kvmhv_vm_nested_init(kvm);
- /*
- * Since we don't flush the TLB when tearing down a VM,
- * and this lpid might have previously been used,
- * make sure we flush on each core before running the new VM.
- * On POWER9, the tlbie in mmu_partition_table_set_entry()
- * does this flush for us.
- */
- if (!cpu_has_feature(CPU_FTR_ARCH_300))
- cpumask_setall(&kvm->arch.need_tlb_flush);
- /* Start out with the default set of hcalls enabled */
- memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
- sizeof(kvm->arch.enabled_hcalls));
- if (!cpu_has_feature(CPU_FTR_ARCH_300))
- kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
- /* Init LPCR for virtual RMA mode */
- if (cpu_has_feature(CPU_FTR_HVMODE)) {
- kvm->arch.host_lpid = mfspr(SPRN_LPID);
- kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
- lpcr &= LPCR_PECE | LPCR_LPES;
- } else {
- lpcr = 0;
- }
- lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
- LPCR_VPM0 | LPCR_VPM1;
- kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
- (VRMA_VSID << SLB_VSID_SHIFT_1T);
- /* On POWER8 turn on online bit to enable PURR/SPURR */
- if (cpu_has_feature(CPU_FTR_ARCH_207S))
- lpcr |= LPCR_ONL;
- /*
- * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed)
- * Set HVICE bit to enable hypervisor virtualization interrupts.
- * Set HEIC to prevent OS interrupts to go to hypervisor (should
- * be unnecessary but better safe than sorry in case we re-enable
- * EE in HV mode with this LPCR still set)
- */
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- lpcr &= ~LPCR_VPM0;
- lpcr |= LPCR_HVICE | LPCR_HEIC;
- /*
- * If xive is enabled, we route 0x500 interrupts directly
- * to the guest.
- */
- if (xics_on_xive())
- lpcr |= LPCR_LPES;
- }
- /*
- * If the host uses radix, the guest starts out as radix.
- */
- if (radix_enabled()) {
- kvm->arch.radix = 1;
- kvm->arch.mmu_ready = 1;
- lpcr &= ~LPCR_VPM1;
- lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
- ret = kvmppc_init_vm_radix(kvm);
- if (ret) {
- kvmppc_free_lpid(kvm->arch.lpid);
- return ret;
- }
- kvmppc_setup_partition_table(kvm);
- }
- kvm->arch.lpcr = lpcr;
- /* Initialization for future HPT resizes */
- kvm->arch.resize_hpt = NULL;
- /*
- * Work out how many sets the TLB has, for the use of
- * the TLB invalidation loop in book3s_hv_rmhandlers.S.
- */
- if (radix_enabled())
- kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */
- else if (cpu_has_feature(CPU_FTR_ARCH_300))
- kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */
- else if (cpu_has_feature(CPU_FTR_ARCH_207S))
- kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */
- else
- kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */
- /*
- * Track that we now have a HV mode VM active. This blocks secondary
- * CPU threads from coming online.
- * On POWER9, we only need to do this if the "indep_threads_mode"
- * module parameter has been set to N.
- */
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- if (!indep_threads_mode && !cpu_has_feature(CPU_FTR_HVMODE)) {
- pr_warn("KVM: Ignoring indep_threads_mode=N in nested hypervisor\n");
- kvm->arch.threads_indep = true;
- } else {
- kvm->arch.threads_indep = indep_threads_mode;
- }
- }
- if (!kvm->arch.threads_indep)
- kvm_hv_vm_activated();
- /*
- * Initialize smt_mode depending on processor.
- * POWER8 and earlier have to use "strict" threading, where
- * all vCPUs in a vcore have to run on the same (sub)core,
- * whereas on POWER9 the threads can each run a different
- * guest.
- */
- if (!cpu_has_feature(CPU_FTR_ARCH_300))
- kvm->arch.smt_mode = threads_per_subcore;
- else
- kvm->arch.smt_mode = 1;
- kvm->arch.emul_smt_mode = 1;
- /*
- * Create a debugfs directory for the VM
- */
- snprintf(buf, sizeof(buf), "vm%d", current->pid);
- kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir);
- kvmppc_mmu_debugfs_init(kvm);
- if (radix_enabled())
- kvmhv_radix_debugfs_init(kvm);
- return 0;
- }
- static void kvmppc_free_vcores(struct kvm *kvm)
- {
- long int i;
- for (i = 0; i < KVM_MAX_VCORES; ++i)
- kfree(kvm->arch.vcores[i]);
- kvm->arch.online_vcores = 0;
- }
- static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
- {
- debugfs_remove_recursive(kvm->arch.debugfs_dir);
- if (!kvm->arch.threads_indep)
- kvm_hv_vm_deactivated();
- kvmppc_free_vcores(kvm);
- if (kvm_is_radix(kvm))
- kvmppc_free_radix(kvm);
- else
- kvmppc_free_hpt(&kvm->arch.hpt);
- /* Perform global invalidation and return lpid to the pool */
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- if (nesting_enabled(kvm))
- kvmhv_release_all_nested(kvm);
- kvm->arch.process_table = 0;
- if (kvm->arch.secure_guest)
- uv_svm_terminate(kvm->arch.lpid);
- kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0);
- }
- kvmppc_free_lpid(kvm->arch.lpid);
- kvmppc_free_pimap(kvm);
- }
- /* We don't need to emulate any privileged instructions or dcbz */
- static int kvmppc_core_emulate_op_hv(struct kvm_vcpu *vcpu,
- unsigned int inst, int *advance)
- {
- return EMULATE_FAIL;
- }
- static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
- ulong spr_val)
- {
- return EMULATE_FAIL;
- }
- static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
- ulong *spr_val)
- {
- return EMULATE_FAIL;
- }
- static int kvmppc_core_check_processor_compat_hv(void)
- {
- if (cpu_has_feature(CPU_FTR_HVMODE) &&
- cpu_has_feature(CPU_FTR_ARCH_206))
- return 0;
- /* POWER9 in radix mode is capable of being a nested hypervisor. */
- if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled())
- return 0;
- return -EIO;
- }
- #ifdef CONFIG_KVM_XICS
- void kvmppc_free_pimap(struct kvm *kvm)
- {
- kfree(kvm->arch.pimap);
- }
- static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void)
- {
- return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL);
- }
- static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
- {
- struct irq_desc *desc;
- struct kvmppc_irq_map *irq_map;
- struct kvmppc_passthru_irqmap *pimap;
- struct irq_chip *chip;
- int i, rc = 0;
- if (!kvm_irq_bypass)
- return 1;
- desc = irq_to_desc(host_irq);
- if (!desc)
- return -EIO;
- mutex_lock(&kvm->lock);
- pimap = kvm->arch.pimap;
- if (pimap == NULL) {
- /* First call, allocate structure to hold IRQ map */
- pimap = kvmppc_alloc_pimap();
- if (pimap == NULL) {
- mutex_unlock(&kvm->lock);
- return -ENOMEM;
- }
- kvm->arch.pimap = pimap;
- }
- /*
- * For now, we only support interrupts for which the EOI operation
- * is an OPAL call followed by a write to XIRR, since that's
- * what our real-mode EOI code does, or a XIVE interrupt
- */
- chip = irq_data_get_irq_chip(&desc->irq_data);
- if (!chip || !(is_pnv_opal_msi(chip) || is_xive_irq(chip))) {
- pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n",
- host_irq, guest_gsi);
- mutex_unlock(&kvm->lock);
- return -ENOENT;
- }
- /*
- * See if we already have an entry for this guest IRQ number.
- * If it's mapped to a hardware IRQ number, that's an error,
- * otherwise re-use this entry.
- */
- for (i = 0; i < pimap->n_mapped; i++) {
- if (guest_gsi == pimap->mapped[i].v_hwirq) {
- if (pimap->mapped[i].r_hwirq) {
- mutex_unlock(&kvm->lock);
- return -EINVAL;
- }
- break;
- }
- }
- if (i == KVMPPC_PIRQ_MAPPED) {
- mutex_unlock(&kvm->lock);
- return -EAGAIN; /* table is full */
- }
- irq_map = &pimap->mapped[i];
- irq_map->v_hwirq = guest_gsi;
- irq_map->desc = desc;
- /*
- * Order the above two stores before the next to serialize with
- * the KVM real mode handler.
- */
- smp_wmb();
- irq_map->r_hwirq = desc->irq_data.hwirq;
- if (i == pimap->n_mapped)
- pimap->n_mapped++;
- if (xics_on_xive())
- rc = kvmppc_xive_set_mapped(kvm, guest_gsi, desc);
- else
- kvmppc_xics_set_mapped(kvm, guest_gsi, desc->irq_data.hwirq);
- if (rc)
- irq_map->r_hwirq = 0;
- mutex_unlock(&kvm->lock);
- return 0;
- }
- static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
- {
- struct irq_desc *desc;
- struct kvmppc_passthru_irqmap *pimap;
- int i, rc = 0;
- if (!kvm_irq_bypass)
- return 0;
- desc = irq_to_desc(host_irq);
- if (!desc)
- return -EIO;
- mutex_lock(&kvm->lock);
- if (!kvm->arch.pimap)
- goto unlock;
- pimap = kvm->arch.pimap;
- for (i = 0; i < pimap->n_mapped; i++) {
- if (guest_gsi == pimap->mapped[i].v_hwirq)
- break;
- }
- if (i == pimap->n_mapped) {
- mutex_unlock(&kvm->lock);
- return -ENODEV;
- }
- if (xics_on_xive())
- rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, pimap->mapped[i].desc);
- else
- kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq);
- /* invalidate the entry (what do do on error from the above ?) */
- pimap->mapped[i].r_hwirq = 0;
- /*
- * We don't free this structure even when the count goes to
- * zero. The structure is freed when we destroy the VM.
- */
- unlock:
- mutex_unlock(&kvm->lock);
- return rc;
- }
- static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons,
- struct irq_bypass_producer *prod)
- {
- int ret = 0;
- struct kvm_kernel_irqfd *irqfd =
- container_of(cons, struct kvm_kernel_irqfd, consumer);
- irqfd->producer = prod;
- ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
- if (ret)
- pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n",
- prod->irq, irqfd->gsi, ret);
- return ret;
- }
- static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons,
- struct irq_bypass_producer *prod)
- {
- int ret;
- struct kvm_kernel_irqfd *irqfd =
- container_of(cons, struct kvm_kernel_irqfd, consumer);
- irqfd->producer = NULL;
- /*
- * When producer of consumer is unregistered, we change back to
- * default external interrupt handling mode - KVM real mode
- * will switch back to host.
- */
- ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
- if (ret)
- pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n",
- prod->irq, irqfd->gsi, ret);
- }
- #endif
- static long kvm_arch_vm_ioctl_hv(struct file *filp,
- unsigned int ioctl, unsigned long arg)
- {
- struct kvm *kvm __maybe_unused = filp->private_data;
- void __user *argp = (void __user *)arg;
- long r;
- switch (ioctl) {
- case KVM_PPC_ALLOCATE_HTAB: {
- u32 htab_order;
- /* If we're a nested hypervisor, we currently only support radix */
- if (kvmhv_on_pseries()) {
- r = -EOPNOTSUPP;
- break;
- }
- r = -EFAULT;
- if (get_user(htab_order, (u32 __user *)argp))
- break;
- r = kvmppc_alloc_reset_hpt(kvm, htab_order);
- if (r)
- break;
- r = 0;
- break;
- }
- case KVM_PPC_GET_HTAB_FD: {
- struct kvm_get_htab_fd ghf;
- r = -EFAULT;
- if (copy_from_user(&ghf, argp, sizeof(ghf)))
- break;
- r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
- break;
- }
- case KVM_PPC_RESIZE_HPT_PREPARE: {
- struct kvm_ppc_resize_hpt rhpt;
- r = -EFAULT;
- if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
- break;
- r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt);
- break;
- }
- case KVM_PPC_RESIZE_HPT_COMMIT: {
- struct kvm_ppc_resize_hpt rhpt;
- r = -EFAULT;
- if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
- break;
- r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt);
- break;
- }
- default:
- r = -ENOTTY;
- }
- return r;
- }
- /*
- * List of hcall numbers to enable by default.
- * For compatibility with old userspace, we enable by default
- * all hcalls that were implemented before the hcall-enabling
- * facility was added. Note this list should not include H_RTAS.
- */
- static unsigned int default_hcall_list[] = {
- H_REMOVE,
- H_ENTER,
- H_READ,
- H_PROTECT,
- H_BULK_REMOVE,
- H_GET_TCE,
- H_PUT_TCE,
- H_SET_DABR,
- H_SET_XDABR,
- H_CEDE,
- H_PROD,
- H_CONFER,
- H_REGISTER_VPA,
- #ifdef CONFIG_KVM_XICS
- H_EOI,
- H_CPPR,
- H_IPI,
- H_IPOLL,
- H_XIRR,
- H_XIRR_X,
- #endif
- 0
- };
- static void init_default_hcalls(void)
- {
- int i;
- unsigned int hcall;
- for (i = 0; default_hcall_list[i]; ++i) {
- hcall = default_hcall_list[i];
- WARN_ON(!kvmppc_hcall_impl_hv(hcall));
- __set_bit(hcall / 4, default_enabled_hcalls);
- }
- }
- static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
- {
- unsigned long lpcr;
- int radix;
- int err;
- /* If not on a POWER9, reject it */
- if (!cpu_has_feature(CPU_FTR_ARCH_300))
- return -ENODEV;
- /* If any unknown flags set, reject it */
- if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE))
- return -EINVAL;
- /* GR (guest radix) bit in process_table field must match */
- radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX);
- if (!!(cfg->process_table & PATB_GR) != radix)
- return -EINVAL;
- /* Process table size field must be reasonable, i.e. <= 24 */
- if ((cfg->process_table & PRTS_MASK) > 24)
- return -EINVAL;
- /* We can change a guest to/from radix now, if the host is radix */
- if (radix && !radix_enabled())
- return -EINVAL;
- /* If we're a nested hypervisor, we currently only support radix */
- if (kvmhv_on_pseries() && !radix)
- return -EINVAL;
- mutex_lock(&kvm->arch.mmu_setup_lock);
- if (radix != kvm_is_radix(kvm)) {
- if (kvm->arch.mmu_ready) {
- kvm->arch.mmu_ready = 0;
- /* order mmu_ready vs. vcpus_running */
- smp_mb();
- if (atomic_read(&kvm->arch.vcpus_running)) {
- kvm->arch.mmu_ready = 1;
- err = -EBUSY;
- goto out_unlock;
- }
- }
- if (radix)
- err = kvmppc_switch_mmu_to_radix(kvm);
- else
- err = kvmppc_switch_mmu_to_hpt(kvm);
- if (err)
- goto out_unlock;
- }
- kvm->arch.process_table = cfg->process_table;
- kvmppc_setup_partition_table(kvm);
- lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0;
- kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE);
- err = 0;
- out_unlock:
- mutex_unlock(&kvm->arch.mmu_setup_lock);
- return err;
- }
- static int kvmhv_enable_nested(struct kvm *kvm)
- {
- if (!nested)
- return -EPERM;
- if (!cpu_has_feature(CPU_FTR_ARCH_300) || no_mixing_hpt_and_radix)
- return -ENODEV;
- /* kvm == NULL means the caller is testing if the capability exists */
- if (kvm)
- kvm->arch.nested_enable = true;
- return 0;
- }
- static int kvmhv_load_from_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
- int size)
- {
- int rc = -EINVAL;
- if (kvmhv_vcpu_is_radix(vcpu)) {
- rc = kvmhv_copy_from_guest_radix(vcpu, *eaddr, ptr, size);
- if (rc > 0)
- rc = -EINVAL;
- }
- /* For now quadrants are the only way to access nested guest memory */
- if (rc && vcpu->arch.nested)
- rc = -EAGAIN;
- return rc;
- }
- static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
- int size)
- {
- int rc = -EINVAL;
- if (kvmhv_vcpu_is_radix(vcpu)) {
- rc = kvmhv_copy_to_guest_radix(vcpu, *eaddr, ptr, size);
- if (rc > 0)
- rc = -EINVAL;
- }
- /* For now quadrants are the only way to access nested guest memory */
- if (rc && vcpu->arch.nested)
- rc = -EAGAIN;
- return rc;
- }
- static void unpin_vpa_reset(struct kvm *kvm, struct kvmppc_vpa *vpa)
- {
- unpin_vpa(kvm, vpa);
- vpa->gpa = 0;
- vpa->pinned_addr = NULL;
- vpa->dirty = false;
- vpa->update_pending = 0;
- }
- /*
- * Enable a guest to become a secure VM, or test whether
- * that could be enabled.
- * Called when the KVM_CAP_PPC_SECURE_GUEST capability is
- * tested (kvm == NULL) or enabled (kvm != NULL).
- */
- static int kvmhv_enable_svm(struct kvm *kvm)
- {
- if (!kvmppc_uvmem_available())
- return -EINVAL;
- if (kvm)
- kvm->arch.svm_enabled = 1;
- return 0;
- }
- /*
- * IOCTL handler to turn off secure mode of guest
- *
- * - Release all device pages
- * - Issue ucall to terminate the guest on the UV side
- * - Unpin the VPA pages.
- * - Reinit the partition scoped page tables
- */
- static int kvmhv_svm_off(struct kvm *kvm)
- {
- struct kvm_vcpu *vcpu;
- int mmu_was_ready;
- int srcu_idx;
- int ret = 0;
- int i;
- if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START))
- return ret;
- mutex_lock(&kvm->arch.mmu_setup_lock);
- mmu_was_ready = kvm->arch.mmu_ready;
- if (kvm->arch.mmu_ready) {
- kvm->arch.mmu_ready = 0;
- /* order mmu_ready vs. vcpus_running */
- smp_mb();
- if (atomic_read(&kvm->arch.vcpus_running)) {
- kvm->arch.mmu_ready = 1;
- ret = -EBUSY;
- goto out;
- }
- }
- srcu_idx = srcu_read_lock(&kvm->srcu);
- for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
- struct kvm_memory_slot *memslot;
- struct kvm_memslots *slots = __kvm_memslots(kvm, i);
- if (!slots)
- continue;
- kvm_for_each_memslot(memslot, slots) {
- kvmppc_uvmem_drop_pages(memslot, kvm, true);
- uv_unregister_mem_slot(kvm->arch.lpid, memslot->id);
- }
- }
- srcu_read_unlock(&kvm->srcu, srcu_idx);
- ret = uv_svm_terminate(kvm->arch.lpid);
- if (ret != U_SUCCESS) {
- ret = -EINVAL;
- goto out;
- }
- /*
- * When secure guest is reset, all the guest pages are sent
- * to UV via UV_PAGE_IN before the non-boot vcpus get a
- * chance to run and unpin their VPA pages. Unpinning of all
- * VPA pages is done here explicitly so that VPA pages
- * can be migrated to the secure side.
- *
- * This is required to for the secure SMP guest to reboot
- * correctly.
- */
- kvm_for_each_vcpu(i, vcpu, kvm) {
- spin_lock(&vcpu->arch.vpa_update_lock);
- unpin_vpa_reset(kvm, &vcpu->arch.dtl);
- unpin_vpa_reset(kvm, &vcpu->arch.slb_shadow);
- unpin_vpa_reset(kvm, &vcpu->arch.vpa);
- spin_unlock(&vcpu->arch.vpa_update_lock);
- }
- kvmppc_setup_partition_table(kvm);
- kvm->arch.secure_guest = 0;
- kvm->arch.mmu_ready = mmu_was_ready;
- out:
- mutex_unlock(&kvm->arch.mmu_setup_lock);
- return ret;
- }
- static struct kvmppc_ops kvm_ops_hv = {
- .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
- .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
- .get_one_reg = kvmppc_get_one_reg_hv,
- .set_one_reg = kvmppc_set_one_reg_hv,
- .vcpu_load = kvmppc_core_vcpu_load_hv,
- .vcpu_put = kvmppc_core_vcpu_put_hv,
- .inject_interrupt = kvmppc_inject_interrupt_hv,
- .set_msr = kvmppc_set_msr_hv,
- .vcpu_run = kvmppc_vcpu_run_hv,
- .vcpu_create = kvmppc_core_vcpu_create_hv,
- .vcpu_free = kvmppc_core_vcpu_free_hv,
- .check_requests = kvmppc_core_check_requests_hv,
- .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv,
- .flush_memslot = kvmppc_core_flush_memslot_hv,
- .prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
- .commit_memory_region = kvmppc_core_commit_memory_region_hv,
- .unmap_hva_range = kvm_unmap_hva_range_hv,
- .age_hva = kvm_age_hva_hv,
- .test_age_hva = kvm_test_age_hva_hv,
- .set_spte_hva = kvm_set_spte_hva_hv,
- .free_memslot = kvmppc_core_free_memslot_hv,
- .init_vm = kvmppc_core_init_vm_hv,
- .destroy_vm = kvmppc_core_destroy_vm_hv,
- .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
- .emulate_op = kvmppc_core_emulate_op_hv,
- .emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
- .emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
- .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
- .arch_vm_ioctl = kvm_arch_vm_ioctl_hv,
- .hcall_implemented = kvmppc_hcall_impl_hv,
- #ifdef CONFIG_KVM_XICS
- .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv,
- .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv,
- #endif
- .configure_mmu = kvmhv_configure_mmu,
- .get_rmmu_info = kvmhv_get_rmmu_info,
- .set_smt_mode = kvmhv_set_smt_mode,
- .enable_nested = kvmhv_enable_nested,
- .load_from_eaddr = kvmhv_load_from_eaddr,
- .store_to_eaddr = kvmhv_store_to_eaddr,
- .enable_svm = kvmhv_enable_svm,
- .svm_off = kvmhv_svm_off,
- };
- static int kvm_init_subcore_bitmap(void)
- {
- int i, j;
- int nr_cores = cpu_nr_cores();
- struct sibling_subcore_state *sibling_subcore_state;
- for (i = 0; i < nr_cores; i++) {
- int first_cpu = i * threads_per_core;
- int node = cpu_to_node(first_cpu);
- /* Ignore if it is already allocated. */
- if (paca_ptrs[first_cpu]->sibling_subcore_state)
- continue;
- sibling_subcore_state =
- kzalloc_node(sizeof(struct sibling_subcore_state),
- GFP_KERNEL, node);
- if (!sibling_subcore_state)
- return -ENOMEM;
- for (j = 0; j < threads_per_core; j++) {
- int cpu = first_cpu + j;
- paca_ptrs[cpu]->sibling_subcore_state =
- sibling_subcore_state;
- }
- }
- return 0;
- }
- static int kvmppc_radix_possible(void)
- {
- return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled();
- }
- static int kvmppc_book3s_init_hv(void)
- {
- int r;
- if (!tlbie_capable) {
- pr_err("KVM-HV: Host does not support TLBIE\n");
- return -ENODEV;
- }
- /*
- * FIXME!! Do we need to check on all cpus ?
- */
- r = kvmppc_core_check_processor_compat_hv();
- if (r < 0)
- return -ENODEV;
- r = kvmhv_nested_init();
- if (r)
- return r;
- r = kvm_init_subcore_bitmap();
- if (r)
- return r;
- /*
- * We need a way of accessing the XICS interrupt controller,
- * either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or
- * indirectly, via OPAL.
- */
- #ifdef CONFIG_SMP
- if (!xics_on_xive() && !kvmhv_on_pseries() &&
- !local_paca->kvm_hstate.xics_phys) {
- struct device_node *np;
- np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc");
- if (!np) {
- pr_err("KVM-HV: Cannot determine method for accessing XICS\n");
- return -ENODEV;
- }
- /* presence of intc confirmed - node can be dropped again */
- of_node_put(np);
- }
- #endif
- kvm_ops_hv.owner = THIS_MODULE;
- kvmppc_hv_ops = &kvm_ops_hv;
- init_default_hcalls();
- init_vcore_lists();
- r = kvmppc_mmu_hv_init();
- if (r)
- return r;
- if (kvmppc_radix_possible()) {
- r = kvmppc_radix_init();
- if (r)
- return r;
- }
- /*
- * POWER9 chips before version 2.02 can't have some threads in
- * HPT mode and some in radix mode on the same core.
- */
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- unsigned int pvr = mfspr(SPRN_PVR);
- if ((pvr >> 16) == PVR_POWER9 &&
- (((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) ||
- ((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101)))
- no_mixing_hpt_and_radix = true;
- }
- r = kvmppc_uvmem_init();
- if (r < 0)
- pr_err("KVM-HV: kvmppc_uvmem_init failed %d\n", r);
- return r;
- }
- static void kvmppc_book3s_exit_hv(void)
- {
- kvmppc_uvmem_free();
- kvmppc_free_host_rm_ops();
- if (kvmppc_radix_possible())
- kvmppc_radix_exit();
- kvmppc_hv_ops = NULL;
- kvmhv_nested_exit();
- }
- module_init(kvmppc_book3s_init_hv);
- module_exit(kvmppc_book3s_exit_hv);
- MODULE_LICENSE("GPL");
- MODULE_ALIAS_MISCDEV(KVM_MINOR);
- MODULE_ALIAS("devname:kvm");
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