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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- *
- * Copyright 2010-2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
- */
- #include <linux/types.h>
- #include <linux/string.h>
- #include <linux/kvm.h>
- #include <linux/kvm_host.h>
- #include <linux/hugetlb.h>
- #include <linux/module.h>
- #include <linux/log2.h>
- #include <linux/sizes.h>
- #include <asm/trace.h>
- #include <asm/kvm_ppc.h>
- #include <asm/kvm_book3s.h>
- #include <asm/book3s/64/mmu-hash.h>
- #include <asm/hvcall.h>
- #include <asm/synch.h>
- #include <asm/ppc-opcode.h>
- #include <asm/pte-walk.h>
- /* Translate address of a vmalloc'd thing to a linear map address */
- static void *real_vmalloc_addr(void *x)
- {
- unsigned long addr = (unsigned long) x;
- pte_t *p;
- /*
- * assume we don't have huge pages in vmalloc space...
- * So don't worry about THP collapse/split. Called
- * Only in realmode with MSR_EE = 0, hence won't need irq_save/restore.
- */
- p = find_init_mm_pte(addr, NULL);
- if (!p || !pte_present(*p))
- return NULL;
- addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK);
- return __va(addr);
- }
- /* Return 1 if we need to do a global tlbie, 0 if we can use tlbiel */
- static int global_invalidates(struct kvm *kvm)
- {
- int global;
- int cpu;
- /*
- * If there is only one vcore, and it's currently running,
- * as indicated by local_paca->kvm_hstate.kvm_vcpu being set,
- * we can use tlbiel as long as we mark all other physical
- * cores as potentially having stale TLB entries for this lpid.
- * Otherwise, don't use tlbiel.
- */
- if (kvm->arch.online_vcores == 1 && local_paca->kvm_hstate.kvm_vcpu)
- global = 0;
- else
- global = 1;
- if (!global) {
- /* any other core might now have stale TLB entries... */
- smp_wmb();
- cpumask_setall(&kvm->arch.need_tlb_flush);
- cpu = local_paca->kvm_hstate.kvm_vcore->pcpu;
- /*
- * On POWER9, threads are independent but the TLB is shared,
- * so use the bit for the first thread to represent the core.
- */
- if (cpu_has_feature(CPU_FTR_ARCH_300))
- cpu = cpu_first_tlb_thread_sibling(cpu);
- cpumask_clear_cpu(cpu, &kvm->arch.need_tlb_flush);
- }
- return global;
- }
- /*
- * Add this HPTE into the chain for the real page.
- * Must be called with the chain locked; it unlocks the chain.
- */
- void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
- unsigned long *rmap, long pte_index, int realmode)
- {
- struct revmap_entry *head, *tail;
- unsigned long i;
- if (*rmap & KVMPPC_RMAP_PRESENT) {
- i = *rmap & KVMPPC_RMAP_INDEX;
- head = &kvm->arch.hpt.rev[i];
- if (realmode)
- head = real_vmalloc_addr(head);
- tail = &kvm->arch.hpt.rev[head->back];
- if (realmode)
- tail = real_vmalloc_addr(tail);
- rev->forw = i;
- rev->back = head->back;
- tail->forw = pte_index;
- head->back = pte_index;
- } else {
- rev->forw = rev->back = pte_index;
- *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) |
- pte_index | KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_HPT;
- }
- unlock_rmap(rmap);
- }
- EXPORT_SYMBOL_GPL(kvmppc_add_revmap_chain);
- /* Update the dirty bitmap of a memslot */
- void kvmppc_update_dirty_map(const struct kvm_memory_slot *memslot,
- unsigned long gfn, unsigned long psize)
- {
- unsigned long npages;
- if (!psize || !memslot->dirty_bitmap)
- return;
- npages = (psize + PAGE_SIZE - 1) / PAGE_SIZE;
- gfn -= memslot->base_gfn;
- set_dirty_bits_atomic(memslot->dirty_bitmap, gfn, npages);
- }
- EXPORT_SYMBOL_GPL(kvmppc_update_dirty_map);
- static void kvmppc_set_dirty_from_hpte(struct kvm *kvm,
- unsigned long hpte_v, unsigned long hpte_gr)
- {
- struct kvm_memory_slot *memslot;
- unsigned long gfn;
- unsigned long psize;
- psize = kvmppc_actual_pgsz(hpte_v, hpte_gr);
- gfn = hpte_rpn(hpte_gr, psize);
- memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn);
- if (memslot && memslot->dirty_bitmap)
- kvmppc_update_dirty_map(memslot, gfn, psize);
- }
- /* Returns a pointer to the revmap entry for the page mapped by a HPTE */
- static unsigned long *revmap_for_hpte(struct kvm *kvm, unsigned long hpte_v,
- unsigned long hpte_gr,
- struct kvm_memory_slot **memslotp,
- unsigned long *gfnp)
- {
- struct kvm_memory_slot *memslot;
- unsigned long *rmap;
- unsigned long gfn;
- gfn = hpte_rpn(hpte_gr, kvmppc_actual_pgsz(hpte_v, hpte_gr));
- memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn);
- if (memslotp)
- *memslotp = memslot;
- if (gfnp)
- *gfnp = gfn;
- if (!memslot)
- return NULL;
- rmap = real_vmalloc_addr(&memslot->arch.rmap[gfn - memslot->base_gfn]);
- return rmap;
- }
- /* Remove this HPTE from the chain for a real page */
- static void remove_revmap_chain(struct kvm *kvm, long pte_index,
- struct revmap_entry *rev,
- unsigned long hpte_v, unsigned long hpte_r)
- {
- struct revmap_entry *next, *prev;
- unsigned long ptel, head;
- unsigned long *rmap;
- unsigned long rcbits;
- struct kvm_memory_slot *memslot;
- unsigned long gfn;
- rcbits = hpte_r & (HPTE_R_R | HPTE_R_C);
- ptel = rev->guest_rpte |= rcbits;
- rmap = revmap_for_hpte(kvm, hpte_v, ptel, &memslot, &gfn);
- if (!rmap)
- return;
- lock_rmap(rmap);
- head = *rmap & KVMPPC_RMAP_INDEX;
- next = real_vmalloc_addr(&kvm->arch.hpt.rev[rev->forw]);
- prev = real_vmalloc_addr(&kvm->arch.hpt.rev[rev->back]);
- next->back = rev->back;
- prev->forw = rev->forw;
- if (head == pte_index) {
- head = rev->forw;
- if (head == pte_index)
- *rmap &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX);
- else
- *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | head;
- }
- *rmap |= rcbits << KVMPPC_RMAP_RC_SHIFT;
- if (rcbits & HPTE_R_C)
- kvmppc_update_dirty_map(memslot, gfn,
- kvmppc_actual_pgsz(hpte_v, hpte_r));
- unlock_rmap(rmap);
- }
- long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags,
- long pte_index, unsigned long pteh, unsigned long ptel,
- pgd_t *pgdir, bool realmode, unsigned long *pte_idx_ret)
- {
- unsigned long i, pa, gpa, gfn, psize;
- unsigned long slot_fn, hva;
- __be64 *hpte;
- struct revmap_entry *rev;
- unsigned long g_ptel;
- struct kvm_memory_slot *memslot;
- unsigned hpage_shift;
- bool is_ci;
- unsigned long *rmap;
- pte_t *ptep;
- unsigned int writing;
- unsigned long mmu_seq;
- unsigned long rcbits;
- if (kvm_is_radix(kvm))
- return H_FUNCTION;
- psize = kvmppc_actual_pgsz(pteh, ptel);
- if (!psize)
- return H_PARAMETER;
- writing = hpte_is_writable(ptel);
- pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID);
- ptel &= ~HPTE_GR_RESERVED;
- g_ptel = ptel;
- /* used later to detect if we might have been invalidated */
- mmu_seq = kvm->mmu_notifier_seq;
- smp_rmb();
- /* Find the memslot (if any) for this address */
- gpa = (ptel & HPTE_R_RPN) & ~(psize - 1);
- gfn = gpa >> PAGE_SHIFT;
- memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn);
- pa = 0;
- is_ci = false;
- rmap = NULL;
- if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) {
- /* Emulated MMIO - mark this with key=31 */
- pteh |= HPTE_V_ABSENT;
- ptel |= HPTE_R_KEY_HI | HPTE_R_KEY_LO;
- goto do_insert;
- }
- /* Check if the requested page fits entirely in the memslot. */
- if (!slot_is_aligned(memslot, psize))
- return H_PARAMETER;
- slot_fn = gfn - memslot->base_gfn;
- rmap = &memslot->arch.rmap[slot_fn];
- /* Translate to host virtual address */
- hva = __gfn_to_hva_memslot(memslot, gfn);
- arch_spin_lock(&kvm->mmu_lock.rlock.raw_lock);
- ptep = find_kvm_host_pte(kvm, mmu_seq, hva, &hpage_shift);
- if (ptep) {
- pte_t pte;
- unsigned int host_pte_size;
- if (hpage_shift)
- host_pte_size = 1ul << hpage_shift;
- else
- host_pte_size = PAGE_SIZE;
- /*
- * We should always find the guest page size
- * to <= host page size, if host is using hugepage
- */
- if (host_pte_size < psize) {
- arch_spin_unlock(&kvm->mmu_lock.rlock.raw_lock);
- return H_PARAMETER;
- }
- pte = kvmppc_read_update_linux_pte(ptep, writing);
- if (pte_present(pte) && !pte_protnone(pte)) {
- if (writing && !__pte_write(pte))
- /* make the actual HPTE be read-only */
- ptel = hpte_make_readonly(ptel);
- is_ci = pte_ci(pte);
- pa = pte_pfn(pte) << PAGE_SHIFT;
- pa |= hva & (host_pte_size - 1);
- pa |= gpa & ~PAGE_MASK;
- }
- }
- arch_spin_unlock(&kvm->mmu_lock.rlock.raw_lock);
- ptel &= HPTE_R_KEY | HPTE_R_PP0 | (psize-1);
- ptel |= pa;
- if (pa)
- pteh |= HPTE_V_VALID;
- else {
- pteh |= HPTE_V_ABSENT;
- ptel &= ~(HPTE_R_KEY_HI | HPTE_R_KEY_LO);
- }
- /*If we had host pte mapping then Check WIMG */
- if (ptep && !hpte_cache_flags_ok(ptel, is_ci)) {
- if (is_ci)
- return H_PARAMETER;
- /*
- * Allow guest to map emulated device memory as
- * uncacheable, but actually make it cacheable.
- */
- ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G);
- ptel |= HPTE_R_M;
- }
- /* Find and lock the HPTEG slot to use */
- do_insert:
- if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
- return H_PARAMETER;
- if (likely((flags & H_EXACT) == 0)) {
- pte_index &= ~7UL;
- hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
- for (i = 0; i < 8; ++i) {
- if ((be64_to_cpu(*hpte) & HPTE_V_VALID) == 0 &&
- try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID |
- HPTE_V_ABSENT))
- break;
- hpte += 2;
- }
- if (i == 8) {
- /*
- * Since try_lock_hpte doesn't retry (not even stdcx.
- * failures), it could be that there is a free slot
- * but we transiently failed to lock it. Try again,
- * actually locking each slot and checking it.
- */
- hpte -= 16;
- for (i = 0; i < 8; ++i) {
- u64 pte;
- while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
- cpu_relax();
- pte = be64_to_cpu(hpte[0]);
- if (!(pte & (HPTE_V_VALID | HPTE_V_ABSENT)))
- break;
- __unlock_hpte(hpte, pte);
- hpte += 2;
- }
- if (i == 8)
- return H_PTEG_FULL;
- }
- pte_index += i;
- } else {
- hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
- if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID |
- HPTE_V_ABSENT)) {
- /* Lock the slot and check again */
- u64 pte;
- while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
- cpu_relax();
- pte = be64_to_cpu(hpte[0]);
- if (pte & (HPTE_V_VALID | HPTE_V_ABSENT)) {
- __unlock_hpte(hpte, pte);
- return H_PTEG_FULL;
- }
- }
- }
- /* Save away the guest's idea of the second HPTE dword */
- rev = &kvm->arch.hpt.rev[pte_index];
- if (realmode)
- rev = real_vmalloc_addr(rev);
- if (rev) {
- rev->guest_rpte = g_ptel;
- note_hpte_modification(kvm, rev);
- }
- /* Link HPTE into reverse-map chain */
- if (pteh & HPTE_V_VALID) {
- if (realmode)
- rmap = real_vmalloc_addr(rmap);
- lock_rmap(rmap);
- /* Check for pending invalidations under the rmap chain lock */
- if (mmu_notifier_retry(kvm, mmu_seq)) {
- /* inval in progress, write a non-present HPTE */
- pteh |= HPTE_V_ABSENT;
- pteh &= ~HPTE_V_VALID;
- ptel &= ~(HPTE_R_KEY_HI | HPTE_R_KEY_LO);
- unlock_rmap(rmap);
- } else {
- kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index,
- realmode);
- /* Only set R/C in real HPTE if already set in *rmap */
- rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT;
- ptel &= rcbits | ~(HPTE_R_R | HPTE_R_C);
- }
- }
- /* Convert to new format on P9 */
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- ptel = hpte_old_to_new_r(pteh, ptel);
- pteh = hpte_old_to_new_v(pteh);
- }
- hpte[1] = cpu_to_be64(ptel);
- /* Write the first HPTE dword, unlocking the HPTE and making it valid */
- eieio();
- __unlock_hpte(hpte, pteh);
- asm volatile("ptesync" : : : "memory");
- *pte_idx_ret = pte_index;
- return H_SUCCESS;
- }
- EXPORT_SYMBOL_GPL(kvmppc_do_h_enter);
- long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
- long pte_index, unsigned long pteh, unsigned long ptel)
- {
- return kvmppc_do_h_enter(vcpu->kvm, flags, pte_index, pteh, ptel,
- vcpu->arch.pgdir, true,
- &vcpu->arch.regs.gpr[4]);
- }
- #ifdef __BIG_ENDIAN__
- #define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token))
- #else
- #define LOCK_TOKEN (*(u32 *)(&get_paca()->paca_index))
- #endif
- static inline int is_mmio_hpte(unsigned long v, unsigned long r)
- {
- return ((v & HPTE_V_ABSENT) &&
- (r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) ==
- (HPTE_R_KEY_HI | HPTE_R_KEY_LO));
- }
- static inline void fixup_tlbie_lpid(unsigned long rb_value, unsigned long lpid)
- {
- if (cpu_has_feature(CPU_FTR_P9_TLBIE_ERAT_BUG)) {
- /* Radix flush for a hash guest */
- unsigned long rb,rs,prs,r,ric;
- rb = PPC_BIT(52); /* IS = 2 */
- rs = 0; /* lpid = 0 */
- prs = 0; /* partition scoped */
- r = 1; /* radix format */
- ric = 0; /* RIC_FLSUH_TLB */
- /*
- * Need the extra ptesync to make sure we don't
- * re-order the tlbie
- */
- asm volatile("ptesync": : :"memory");
- asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
- : : "r"(rb), "i"(r), "i"(prs),
- "i"(ric), "r"(rs) : "memory");
- }
- if (cpu_has_feature(CPU_FTR_P9_TLBIE_STQ_BUG)) {
- asm volatile("ptesync": : :"memory");
- asm volatile(PPC_TLBIE_5(%0,%1,0,0,0) : :
- "r" (rb_value), "r" (lpid));
- }
- }
- static void do_tlbies(struct kvm *kvm, unsigned long *rbvalues,
- long npages, int global, bool need_sync)
- {
- long i;
- /*
- * We use the POWER9 5-operand versions of tlbie and tlbiel here.
- * Since we are using RIC=0 PRS=0 R=0, and P7/P8 tlbiel ignores
- * the RS field, this is backwards-compatible with P7 and P8.
- */
- if (global) {
- if (need_sync)
- asm volatile("ptesync" : : : "memory");
- for (i = 0; i < npages; ++i) {
- asm volatile(PPC_TLBIE_5(%0,%1,0,0,0) : :
- "r" (rbvalues[i]), "r" (kvm->arch.lpid));
- }
- fixup_tlbie_lpid(rbvalues[i - 1], kvm->arch.lpid);
- asm volatile("eieio; tlbsync; ptesync" : : : "memory");
- } else {
- if (need_sync)
- asm volatile("ptesync" : : : "memory");
- for (i = 0; i < npages; ++i) {
- asm volatile(PPC_TLBIEL(%0,%1,0,0,0) : :
- "r" (rbvalues[i]), "r" (0));
- }
- asm volatile("ptesync" : : : "memory");
- }
- }
- long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
- unsigned long pte_index, unsigned long avpn,
- unsigned long *hpret)
- {
- __be64 *hpte;
- unsigned long v, r, rb;
- struct revmap_entry *rev;
- u64 pte, orig_pte, pte_r;
- if (kvm_is_radix(kvm))
- return H_FUNCTION;
- if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
- return H_PARAMETER;
- hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
- while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
- cpu_relax();
- pte = orig_pte = be64_to_cpu(hpte[0]);
- pte_r = be64_to_cpu(hpte[1]);
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- pte = hpte_new_to_old_v(pte, pte_r);
- pte_r = hpte_new_to_old_r(pte_r);
- }
- if ((pte & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 ||
- ((flags & H_AVPN) && (pte & ~0x7fUL) != avpn) ||
- ((flags & H_ANDCOND) && (pte & avpn) != 0)) {
- __unlock_hpte(hpte, orig_pte);
- return H_NOT_FOUND;
- }
- rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
- v = pte & ~HPTE_V_HVLOCK;
- if (v & HPTE_V_VALID) {
- hpte[0] &= ~cpu_to_be64(HPTE_V_VALID);
- rb = compute_tlbie_rb(v, pte_r, pte_index);
- do_tlbies(kvm, &rb, 1, global_invalidates(kvm), true);
- /*
- * The reference (R) and change (C) bits in a HPT
- * entry can be set by hardware at any time up until
- * the HPTE is invalidated and the TLB invalidation
- * sequence has completed. This means that when
- * removing a HPTE, we need to re-read the HPTE after
- * the invalidation sequence has completed in order to
- * obtain reliable values of R and C.
- */
- remove_revmap_chain(kvm, pte_index, rev, v,
- be64_to_cpu(hpte[1]));
- }
- r = rev->guest_rpte & ~HPTE_GR_RESERVED;
- note_hpte_modification(kvm, rev);
- unlock_hpte(hpte, 0);
- if (is_mmio_hpte(v, pte_r))
- atomic64_inc(&kvm->arch.mmio_update);
- if (v & HPTE_V_ABSENT)
- v = (v & ~HPTE_V_ABSENT) | HPTE_V_VALID;
- hpret[0] = v;
- hpret[1] = r;
- return H_SUCCESS;
- }
- EXPORT_SYMBOL_GPL(kvmppc_do_h_remove);
- long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
- unsigned long pte_index, unsigned long avpn)
- {
- return kvmppc_do_h_remove(vcpu->kvm, flags, pte_index, avpn,
- &vcpu->arch.regs.gpr[4]);
- }
- long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
- {
- struct kvm *kvm = vcpu->kvm;
- unsigned long *args = &vcpu->arch.regs.gpr[4];
- __be64 *hp, *hptes[4];
- unsigned long tlbrb[4];
- long int i, j, k, n, found, indexes[4];
- unsigned long flags, req, pte_index, rcbits;
- int global;
- long int ret = H_SUCCESS;
- struct revmap_entry *rev, *revs[4];
- u64 hp0, hp1;
- if (kvm_is_radix(kvm))
- return H_FUNCTION;
- global = global_invalidates(kvm);
- for (i = 0; i < 4 && ret == H_SUCCESS; ) {
- n = 0;
- for (; i < 4; ++i) {
- j = i * 2;
- pte_index = args[j];
- flags = pte_index >> 56;
- pte_index &= ((1ul << 56) - 1);
- req = flags >> 6;
- flags &= 3;
- if (req == 3) { /* no more requests */
- i = 4;
- break;
- }
- if (req != 1 || flags == 3 ||
- pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt)) {
- /* parameter error */
- args[j] = ((0xa0 | flags) << 56) + pte_index;
- ret = H_PARAMETER;
- break;
- }
- hp = (__be64 *) (kvm->arch.hpt.virt + (pte_index << 4));
- /* to avoid deadlock, don't spin except for first */
- if (!try_lock_hpte(hp, HPTE_V_HVLOCK)) {
- if (n)
- break;
- while (!try_lock_hpte(hp, HPTE_V_HVLOCK))
- cpu_relax();
- }
- found = 0;
- hp0 = be64_to_cpu(hp[0]);
- hp1 = be64_to_cpu(hp[1]);
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- hp0 = hpte_new_to_old_v(hp0, hp1);
- hp1 = hpte_new_to_old_r(hp1);
- }
- if (hp0 & (HPTE_V_ABSENT | HPTE_V_VALID)) {
- switch (flags & 3) {
- case 0: /* absolute */
- found = 1;
- break;
- case 1: /* andcond */
- if (!(hp0 & args[j + 1]))
- found = 1;
- break;
- case 2: /* AVPN */
- if ((hp0 & ~0x7fUL) == args[j + 1])
- found = 1;
- break;
- }
- }
- if (!found) {
- hp[0] &= ~cpu_to_be64(HPTE_V_HVLOCK);
- args[j] = ((0x90 | flags) << 56) + pte_index;
- continue;
- }
- args[j] = ((0x80 | flags) << 56) + pte_index;
- rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
- note_hpte_modification(kvm, rev);
- if (!(hp0 & HPTE_V_VALID)) {
- /* insert R and C bits from PTE */
- rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C);
- args[j] |= rcbits << (56 - 5);
- hp[0] = 0;
- if (is_mmio_hpte(hp0, hp1))
- atomic64_inc(&kvm->arch.mmio_update);
- continue;
- }
- /* leave it locked */
- hp[0] &= ~cpu_to_be64(HPTE_V_VALID);
- tlbrb[n] = compute_tlbie_rb(hp0, hp1, pte_index);
- indexes[n] = j;
- hptes[n] = hp;
- revs[n] = rev;
- ++n;
- }
- if (!n)
- break;
- /* Now that we've collected a batch, do the tlbies */
- do_tlbies(kvm, tlbrb, n, global, true);
- /* Read PTE low words after tlbie to get final R/C values */
- for (k = 0; k < n; ++k) {
- j = indexes[k];
- pte_index = args[j] & ((1ul << 56) - 1);
- hp = hptes[k];
- rev = revs[k];
- remove_revmap_chain(kvm, pte_index, rev,
- be64_to_cpu(hp[0]), be64_to_cpu(hp[1]));
- rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C);
- args[j] |= rcbits << (56 - 5);
- __unlock_hpte(hp, 0);
- }
- }
- return ret;
- }
- long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
- unsigned long pte_index, unsigned long avpn,
- unsigned long va)
- {
- struct kvm *kvm = vcpu->kvm;
- __be64 *hpte;
- struct revmap_entry *rev;
- unsigned long v, r, rb, mask, bits;
- u64 pte_v, pte_r;
- if (kvm_is_radix(kvm))
- return H_FUNCTION;
- if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
- return H_PARAMETER;
- hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
- while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
- cpu_relax();
- v = pte_v = be64_to_cpu(hpte[0]);
- if (cpu_has_feature(CPU_FTR_ARCH_300))
- v = hpte_new_to_old_v(v, be64_to_cpu(hpte[1]));
- if ((v & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 ||
- ((flags & H_AVPN) && (v & ~0x7fUL) != avpn)) {
- __unlock_hpte(hpte, pte_v);
- return H_NOT_FOUND;
- }
- pte_r = be64_to_cpu(hpte[1]);
- bits = (flags << 55) & HPTE_R_PP0;
- bits |= (flags << 48) & HPTE_R_KEY_HI;
- bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
- /* Update guest view of 2nd HPTE dword */
- mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N |
- HPTE_R_KEY_HI | HPTE_R_KEY_LO;
- rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
- if (rev) {
- r = (rev->guest_rpte & ~mask) | bits;
- rev->guest_rpte = r;
- note_hpte_modification(kvm, rev);
- }
- /* Update HPTE */
- if (v & HPTE_V_VALID) {
- /*
- * If the page is valid, don't let it transition from
- * readonly to writable. If it should be writable, we'll
- * take a trap and let the page fault code sort it out.
- */
- r = (pte_r & ~mask) | bits;
- if (hpte_is_writable(r) && !hpte_is_writable(pte_r))
- r = hpte_make_readonly(r);
- /* If the PTE is changing, invalidate it first */
- if (r != pte_r) {
- rb = compute_tlbie_rb(v, r, pte_index);
- hpte[0] = cpu_to_be64((pte_v & ~HPTE_V_VALID) |
- HPTE_V_ABSENT);
- do_tlbies(kvm, &rb, 1, global_invalidates(kvm), true);
- /* Don't lose R/C bit updates done by hardware */
- r |= be64_to_cpu(hpte[1]) & (HPTE_R_R | HPTE_R_C);
- hpte[1] = cpu_to_be64(r);
- }
- }
- unlock_hpte(hpte, pte_v & ~HPTE_V_HVLOCK);
- asm volatile("ptesync" : : : "memory");
- if (is_mmio_hpte(v, pte_r))
- atomic64_inc(&kvm->arch.mmio_update);
- return H_SUCCESS;
- }
- long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
- unsigned long pte_index)
- {
- struct kvm *kvm = vcpu->kvm;
- __be64 *hpte;
- unsigned long v, r;
- int i, n = 1;
- struct revmap_entry *rev = NULL;
- if (kvm_is_radix(kvm))
- return H_FUNCTION;
- if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
- return H_PARAMETER;
- if (flags & H_READ_4) {
- pte_index &= ~3;
- n = 4;
- }
- rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
- for (i = 0; i < n; ++i, ++pte_index) {
- hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
- v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK;
- r = be64_to_cpu(hpte[1]);
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- v = hpte_new_to_old_v(v, r);
- r = hpte_new_to_old_r(r);
- }
- if (v & HPTE_V_ABSENT) {
- v &= ~HPTE_V_ABSENT;
- v |= HPTE_V_VALID;
- }
- if (v & HPTE_V_VALID) {
- r = rev[i].guest_rpte | (r & (HPTE_R_R | HPTE_R_C));
- r &= ~HPTE_GR_RESERVED;
- }
- vcpu->arch.regs.gpr[4 + i * 2] = v;
- vcpu->arch.regs.gpr[5 + i * 2] = r;
- }
- return H_SUCCESS;
- }
- long kvmppc_h_clear_ref(struct kvm_vcpu *vcpu, unsigned long flags,
- unsigned long pte_index)
- {
- struct kvm *kvm = vcpu->kvm;
- __be64 *hpte;
- unsigned long v, r, gr;
- struct revmap_entry *rev;
- unsigned long *rmap;
- long ret = H_NOT_FOUND;
- if (kvm_is_radix(kvm))
- return H_FUNCTION;
- if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
- return H_PARAMETER;
- rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
- hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
- while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
- cpu_relax();
- v = be64_to_cpu(hpte[0]);
- r = be64_to_cpu(hpte[1]);
- if (!(v & (HPTE_V_VALID | HPTE_V_ABSENT)))
- goto out;
- gr = rev->guest_rpte;
- if (rev->guest_rpte & HPTE_R_R) {
- rev->guest_rpte &= ~HPTE_R_R;
- note_hpte_modification(kvm, rev);
- }
- if (v & HPTE_V_VALID) {
- gr |= r & (HPTE_R_R | HPTE_R_C);
- if (r & HPTE_R_R) {
- kvmppc_clear_ref_hpte(kvm, hpte, pte_index);
- rmap = revmap_for_hpte(kvm, v, gr, NULL, NULL);
- if (rmap) {
- lock_rmap(rmap);
- *rmap |= KVMPPC_RMAP_REFERENCED;
- unlock_rmap(rmap);
- }
- }
- }
- vcpu->arch.regs.gpr[4] = gr;
- ret = H_SUCCESS;
- out:
- unlock_hpte(hpte, v & ~HPTE_V_HVLOCK);
- return ret;
- }
- long kvmppc_h_clear_mod(struct kvm_vcpu *vcpu, unsigned long flags,
- unsigned long pte_index)
- {
- struct kvm *kvm = vcpu->kvm;
- __be64 *hpte;
- unsigned long v, r, gr;
- struct revmap_entry *rev;
- long ret = H_NOT_FOUND;
- if (kvm_is_radix(kvm))
- return H_FUNCTION;
- if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
- return H_PARAMETER;
- rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
- hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
- while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
- cpu_relax();
- v = be64_to_cpu(hpte[0]);
- r = be64_to_cpu(hpte[1]);
- if (!(v & (HPTE_V_VALID | HPTE_V_ABSENT)))
- goto out;
- gr = rev->guest_rpte;
- if (gr & HPTE_R_C) {
- rev->guest_rpte &= ~HPTE_R_C;
- note_hpte_modification(kvm, rev);
- }
- if (v & HPTE_V_VALID) {
- /* need to make it temporarily absent so C is stable */
- hpte[0] |= cpu_to_be64(HPTE_V_ABSENT);
- kvmppc_invalidate_hpte(kvm, hpte, pte_index);
- r = be64_to_cpu(hpte[1]);
- gr |= r & (HPTE_R_R | HPTE_R_C);
- if (r & HPTE_R_C) {
- hpte[1] = cpu_to_be64(r & ~HPTE_R_C);
- eieio();
- kvmppc_set_dirty_from_hpte(kvm, v, gr);
- }
- }
- vcpu->arch.regs.gpr[4] = gr;
- ret = H_SUCCESS;
- out:
- unlock_hpte(hpte, v & ~HPTE_V_HVLOCK);
- return ret;
- }
- static int kvmppc_get_hpa(struct kvm_vcpu *vcpu, unsigned long mmu_seq,
- unsigned long gpa, int writing, unsigned long *hpa,
- struct kvm_memory_slot **memslot_p)
- {
- struct kvm *kvm = vcpu->kvm;
- struct kvm_memory_slot *memslot;
- unsigned long gfn, hva, pa, psize = PAGE_SHIFT;
- unsigned int shift;
- pte_t *ptep, pte;
- /* Find the memslot for this address */
- gfn = gpa >> PAGE_SHIFT;
- memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn);
- if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
- return H_PARAMETER;
- /* Translate to host virtual address */
- hva = __gfn_to_hva_memslot(memslot, gfn);
- /* Try to find the host pte for that virtual address */
- ptep = find_kvm_host_pte(kvm, mmu_seq, hva, &shift);
- if (!ptep)
- return H_TOO_HARD;
- pte = kvmppc_read_update_linux_pte(ptep, writing);
- if (!pte_present(pte))
- return H_TOO_HARD;
- /* Convert to a physical address */
- if (shift)
- psize = 1UL << shift;
- pa = pte_pfn(pte) << PAGE_SHIFT;
- pa |= hva & (psize - 1);
- pa |= gpa & ~PAGE_MASK;
- if (hpa)
- *hpa = pa;
- if (memslot_p)
- *memslot_p = memslot;
- return H_SUCCESS;
- }
- static long kvmppc_do_h_page_init_zero(struct kvm_vcpu *vcpu,
- unsigned long dest)
- {
- struct kvm_memory_slot *memslot;
- struct kvm *kvm = vcpu->kvm;
- unsigned long pa, mmu_seq;
- long ret = H_SUCCESS;
- int i;
- /* Used later to detect if we might have been invalidated */
- mmu_seq = kvm->mmu_notifier_seq;
- smp_rmb();
- arch_spin_lock(&kvm->mmu_lock.rlock.raw_lock);
- ret = kvmppc_get_hpa(vcpu, mmu_seq, dest, 1, &pa, &memslot);
- if (ret != H_SUCCESS)
- goto out_unlock;
- /* Zero the page */
- for (i = 0; i < SZ_4K; i += L1_CACHE_BYTES, pa += L1_CACHE_BYTES)
- dcbz((void *)pa);
- kvmppc_update_dirty_map(memslot, dest >> PAGE_SHIFT, PAGE_SIZE);
- out_unlock:
- arch_spin_unlock(&kvm->mmu_lock.rlock.raw_lock);
- return ret;
- }
- static long kvmppc_do_h_page_init_copy(struct kvm_vcpu *vcpu,
- unsigned long dest, unsigned long src)
- {
- unsigned long dest_pa, src_pa, mmu_seq;
- struct kvm_memory_slot *dest_memslot;
- struct kvm *kvm = vcpu->kvm;
- long ret = H_SUCCESS;
- /* Used later to detect if we might have been invalidated */
- mmu_seq = kvm->mmu_notifier_seq;
- smp_rmb();
- arch_spin_lock(&kvm->mmu_lock.rlock.raw_lock);
- ret = kvmppc_get_hpa(vcpu, mmu_seq, dest, 1, &dest_pa, &dest_memslot);
- if (ret != H_SUCCESS)
- goto out_unlock;
- ret = kvmppc_get_hpa(vcpu, mmu_seq, src, 0, &src_pa, NULL);
- if (ret != H_SUCCESS)
- goto out_unlock;
- /* Copy the page */
- memcpy((void *)dest_pa, (void *)src_pa, SZ_4K);
- kvmppc_update_dirty_map(dest_memslot, dest >> PAGE_SHIFT, PAGE_SIZE);
- out_unlock:
- arch_spin_unlock(&kvm->mmu_lock.rlock.raw_lock);
- return ret;
- }
- long kvmppc_rm_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags,
- unsigned long dest, unsigned long src)
- {
- struct kvm *kvm = vcpu->kvm;
- u64 pg_mask = SZ_4K - 1; /* 4K page size */
- long ret = H_SUCCESS;
- /* Don't handle radix mode here, go up to the virtual mode handler */
- if (kvm_is_radix(kvm))
- return H_TOO_HARD;
- /* 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_do_h_page_init_copy(vcpu, dest, src);
- else if (flags & H_ZERO_PAGE)
- ret = kvmppc_do_h_page_init_zero(vcpu, dest);
- /* We can ignore the other flags */
- return ret;
- }
- void kvmppc_invalidate_hpte(struct kvm *kvm, __be64 *hptep,
- unsigned long pte_index)
- {
- unsigned long rb;
- u64 hp0, hp1;
- hptep[0] &= ~cpu_to_be64(HPTE_V_VALID);
- hp0 = be64_to_cpu(hptep[0]);
- hp1 = be64_to_cpu(hptep[1]);
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- hp0 = hpte_new_to_old_v(hp0, hp1);
- hp1 = hpte_new_to_old_r(hp1);
- }
- rb = compute_tlbie_rb(hp0, hp1, pte_index);
- do_tlbies(kvm, &rb, 1, 1, true);
- }
- EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte);
- void kvmppc_clear_ref_hpte(struct kvm *kvm, __be64 *hptep,
- unsigned long pte_index)
- {
- unsigned long rb;
- unsigned char rbyte;
- u64 hp0, hp1;
- hp0 = be64_to_cpu(hptep[0]);
- hp1 = be64_to_cpu(hptep[1]);
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- hp0 = hpte_new_to_old_v(hp0, hp1);
- hp1 = hpte_new_to_old_r(hp1);
- }
- rb = compute_tlbie_rb(hp0, hp1, pte_index);
- rbyte = (be64_to_cpu(hptep[1]) & ~HPTE_R_R) >> 8;
- /* modify only the second-last byte, which contains the ref bit */
- *((char *)hptep + 14) = rbyte;
- do_tlbies(kvm, &rb, 1, 1, false);
- }
- EXPORT_SYMBOL_GPL(kvmppc_clear_ref_hpte);
- static int slb_base_page_shift[4] = {
- 24, /* 16M */
- 16, /* 64k */
- 34, /* 16G */
- 20, /* 1M, unsupported */
- };
- static struct mmio_hpte_cache_entry *mmio_cache_search(struct kvm_vcpu *vcpu,
- unsigned long eaddr, unsigned long slb_v, long mmio_update)
- {
- struct mmio_hpte_cache_entry *entry = NULL;
- unsigned int pshift;
- unsigned int i;
- for (i = 0; i < MMIO_HPTE_CACHE_SIZE; i++) {
- entry = &vcpu->arch.mmio_cache.entry[i];
- if (entry->mmio_update == mmio_update) {
- pshift = entry->slb_base_pshift;
- if ((entry->eaddr >> pshift) == (eaddr >> pshift) &&
- entry->slb_v == slb_v)
- return entry;
- }
- }
- return NULL;
- }
- static struct mmio_hpte_cache_entry *
- next_mmio_cache_entry(struct kvm_vcpu *vcpu)
- {
- unsigned int index = vcpu->arch.mmio_cache.index;
- vcpu->arch.mmio_cache.index++;
- if (vcpu->arch.mmio_cache.index == MMIO_HPTE_CACHE_SIZE)
- vcpu->arch.mmio_cache.index = 0;
- return &vcpu->arch.mmio_cache.entry[index];
- }
- /* When called from virtmode, this func should be protected by
- * preempt_disable(), otherwise, the holding of HPTE_V_HVLOCK
- * can trigger deadlock issue.
- */
- long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v,
- unsigned long valid)
- {
- unsigned int i;
- unsigned int pshift;
- unsigned long somask;
- unsigned long vsid, hash;
- unsigned long avpn;
- __be64 *hpte;
- unsigned long mask, val;
- unsigned long v, r, orig_v;
- /* Get page shift, work out hash and AVPN etc. */
- mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_SECONDARY;
- val = 0;
- pshift = 12;
- if (slb_v & SLB_VSID_L) {
- mask |= HPTE_V_LARGE;
- val |= HPTE_V_LARGE;
- pshift = slb_base_page_shift[(slb_v & SLB_VSID_LP) >> 4];
- }
- if (slb_v & SLB_VSID_B_1T) {
- somask = (1UL << 40) - 1;
- vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T;
- vsid ^= vsid << 25;
- } else {
- somask = (1UL << 28) - 1;
- vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT;
- }
- hash = (vsid ^ ((eaddr & somask) >> pshift)) & kvmppc_hpt_mask(&kvm->arch.hpt);
- avpn = slb_v & ~(somask >> 16); /* also includes B */
- avpn |= (eaddr & somask) >> 16;
- if (pshift >= 24)
- avpn &= ~((1UL << (pshift - 16)) - 1);
- else
- avpn &= ~0x7fUL;
- val |= avpn;
- for (;;) {
- hpte = (__be64 *)(kvm->arch.hpt.virt + (hash << 7));
- for (i = 0; i < 16; i += 2) {
- /* Read the PTE racily */
- v = be64_to_cpu(hpte[i]) & ~HPTE_V_HVLOCK;
- if (cpu_has_feature(CPU_FTR_ARCH_300))
- v = hpte_new_to_old_v(v, be64_to_cpu(hpte[i+1]));
- /* Check valid/absent, hash, segment size and AVPN */
- if (!(v & valid) || (v & mask) != val)
- continue;
- /* Lock the PTE and read it under the lock */
- while (!try_lock_hpte(&hpte[i], HPTE_V_HVLOCK))
- cpu_relax();
- v = orig_v = be64_to_cpu(hpte[i]) & ~HPTE_V_HVLOCK;
- r = be64_to_cpu(hpte[i+1]);
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- v = hpte_new_to_old_v(v, r);
- r = hpte_new_to_old_r(r);
- }
- /*
- * Check the HPTE again, including base page size
- */
- if ((v & valid) && (v & mask) == val &&
- kvmppc_hpte_base_page_shift(v, r) == pshift)
- /* Return with the HPTE still locked */
- return (hash << 3) + (i >> 1);
- __unlock_hpte(&hpte[i], orig_v);
- }
- if (val & HPTE_V_SECONDARY)
- break;
- val |= HPTE_V_SECONDARY;
- hash = hash ^ kvmppc_hpt_mask(&kvm->arch.hpt);
- }
- return -1;
- }
- EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte);
- /*
- * Called in real mode to check whether an HPTE not found fault
- * is due to accessing a paged-out page or an emulated MMIO page,
- * or if a protection fault is due to accessing a page that the
- * guest wanted read/write access to but which we made read-only.
- * Returns a possibly modified status (DSISR) value if not
- * (i.e. pass the interrupt to the guest),
- * -1 to pass the fault up to host kernel mode code, -2 to do that
- * and also load the instruction word (for MMIO emulation),
- * or 0 if we should make the guest retry the access.
- */
- long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
- unsigned long slb_v, unsigned int status, bool data)
- {
- struct kvm *kvm = vcpu->kvm;
- long int index;
- unsigned long v, r, gr, orig_v;
- __be64 *hpte;
- unsigned long valid;
- struct revmap_entry *rev;
- unsigned long pp, key;
- struct mmio_hpte_cache_entry *cache_entry = NULL;
- long mmio_update = 0;
- /* For protection fault, expect to find a valid HPTE */
- valid = HPTE_V_VALID;
- if (status & DSISR_NOHPTE) {
- valid |= HPTE_V_ABSENT;
- mmio_update = atomic64_read(&kvm->arch.mmio_update);
- cache_entry = mmio_cache_search(vcpu, addr, slb_v, mmio_update);
- }
- if (cache_entry) {
- index = cache_entry->pte_index;
- v = cache_entry->hpte_v;
- r = cache_entry->hpte_r;
- gr = cache_entry->rpte;
- } else {
- index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid);
- if (index < 0) {
- if (status & DSISR_NOHPTE)
- return status; /* there really was no HPTE */
- return 0; /* for prot fault, HPTE disappeared */
- }
- hpte = (__be64 *)(kvm->arch.hpt.virt + (index << 4));
- v = orig_v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK;
- r = be64_to_cpu(hpte[1]);
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
- v = hpte_new_to_old_v(v, r);
- r = hpte_new_to_old_r(r);
- }
- rev = real_vmalloc_addr(&kvm->arch.hpt.rev[index]);
- gr = rev->guest_rpte;
- unlock_hpte(hpte, orig_v);
- }
- /* For not found, if the HPTE is valid by now, retry the instruction */
- if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID))
- return 0;
- /* Check access permissions to the page */
- pp = gr & (HPTE_R_PP0 | HPTE_R_PP);
- key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS;
- status &= ~DSISR_NOHPTE; /* DSISR_NOHPTE == SRR1_ISI_NOPT */
- if (!data) {
- if (gr & (HPTE_R_N | HPTE_R_G))
- return status | SRR1_ISI_N_G_OR_CIP;
- if (!hpte_read_permission(pp, slb_v & key))
- return status | SRR1_ISI_PROT;
- } else if (status & DSISR_ISSTORE) {
- /* check write permission */
- if (!hpte_write_permission(pp, slb_v & key))
- return status | DSISR_PROTFAULT;
- } else {
- if (!hpte_read_permission(pp, slb_v & key))
- return status | DSISR_PROTFAULT;
- }
- /* Check storage key, if applicable */
- if (data && (vcpu->arch.shregs.msr & MSR_DR)) {
- unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr);
- if (status & DSISR_ISSTORE)
- perm >>= 1;
- if (perm & 1)
- return status | DSISR_KEYFAULT;
- }
- /* Save HPTE info for virtual-mode handler */
- vcpu->arch.pgfault_addr = addr;
- vcpu->arch.pgfault_index = index;
- vcpu->arch.pgfault_hpte[0] = v;
- vcpu->arch.pgfault_hpte[1] = r;
- vcpu->arch.pgfault_cache = cache_entry;
- /* Check the storage key to see if it is possibly emulated MMIO */
- if ((r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) ==
- (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) {
- if (!cache_entry) {
- unsigned int pshift = 12;
- unsigned int pshift_index;
- if (slb_v & SLB_VSID_L) {
- pshift_index = ((slb_v & SLB_VSID_LP) >> 4);
- pshift = slb_base_page_shift[pshift_index];
- }
- cache_entry = next_mmio_cache_entry(vcpu);
- cache_entry->eaddr = addr;
- cache_entry->slb_base_pshift = pshift;
- cache_entry->pte_index = index;
- cache_entry->hpte_v = v;
- cache_entry->hpte_r = r;
- cache_entry->rpte = gr;
- cache_entry->slb_v = slb_v;
- cache_entry->mmio_update = mmio_update;
- }
- if (data && (vcpu->arch.shregs.msr & MSR_IR))
- return -2; /* MMIO emulation - load instr word */
- }
- return -1; /* send fault up to host kernel mode */
- }
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