1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162116311641165116611671168116911701171117211731174117511761177117811791180118111821183118411851186118711881189119011911192119311941195119611971198119912001201120212031204120512061207120812091210121112121213121412151216121712181219122012211222122312241225122612271228122912301231123212331234123512361237123812391240124112421243124412451246124712481249125012511252125312541255125612571258125912601261126212631264126512661267126812691270127112721273127412751276127712781279128012811282128312841285128612871288128912901291129212931294129512961297129812991300130113021303130413051306130713081309131013111312131313141315131613171318131913201321132213231324132513261327132813291330133113321333133413351336133713381339134013411342134313441345134613471348134913501351135213531354135513561357135813591360136113621363136413651366136713681369137013711372137313741375137613771378137913801381138213831384138513861387138813891390139113921393139413951396139713981399140014011402140314041405140614071408140914101411141214131414141514161417141814191420142114221423142414251426142714281429143014311432143314341435143614371438143914401441144214431444144514461447144814491450145114521453145414551456145714581459146014611462146314641465146614671468146914701471147214731474147514761477147814791480148114821483148414851486148714881489149014911492149314941495149614971498149915001501150215031504150515061507150815091510151115121513151415151516151715181519152015211522152315241525152615271528152915301531153215331534153515361537153815391540154115421543154415451546154715481549155015511552155315541555155615571558155915601561156215631564156515661567156815691570157115721573157415751576157715781579158015811582158315841585158615871588158915901591159215931594159515961597159815991600160116021603160416051606160716081609161016111612161316141615161616171618161916201621162216231624162516261627162816291630163116321633163416351636163716381639164016411642164316441645164616471648164916501651165216531654165516561657165816591660166116621663166416651666166716681669167016711672167316741675167616771678167916801681168216831684168516861687168816891690169116921693169416951696169716981699170017011702170317041705170617071708170917101711171217131714171517161717171817191720172117221723172417251726172717281729173017311732173317341735173617371738173917401741174217431744174517461747174817491750175117521753175417551756175717581759176017611762176317641765176617671768176917701771177217731774177517761777177817791780178117821783178417851786178717881789179017911792179317941795179617971798179918001801180218031804180518061807180818091810181118121813181418151816181718181819182018211822182318241825182618271828182918301831183218331834183518361837183818391840184118421843184418451846184718481849185018511852185318541855185618571858185918601861186218631864186518661867186818691870187118721873187418751876187718781879188018811882188318841885188618871888188918901891189218931894189518961897189818991900190119021903190419051906190719081909191019111912191319141915191619171918191919201921192219231924192519261927192819291930193119321933193419351936193719381939194019411942194319441945194619471948194919501951195219531954195519561957195819591960196119621963196419651966196719681969197019711972197319741975197619771978197919801981198219831984198519861987198819891990199119921993199419951996199719981999200020012002200320042005200620072008200920102011201220132014201520162017201820192020202120222023202420252026202720282029203020312032203320342035203620372038203920402041204220432044204520462047204820492050205120522053205420552056205720582059206020612062206320642065206620672068206920702071207220732074207520762077207820792080208120822083208420852086208720882089209020912092209320942095209620972098209921002101210221032104 |
- /*
- * Kernel-based Virtual Machine driver for Linux
- *
- * This module enables machines with Intel VT-x extensions to run virtual
- * machines without emulation or binary translation.
- *
- * Copyright (C) 2006 Qumranet, Inc.
- *
- * Authors:
- * Avi Kivity <avi@qumranet.com>
- * Yaniv Kamay <yaniv@qumranet.com>
- *
- * This work is licensed under the terms of the GNU GPL, version 2. See
- * the COPYING file in the top-level directory.
- *
- */
- #include "kvm.h"
- #include "vmx.h"
- #include "kvm_vmx.h"
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/highmem.h>
- #include <linux/profile.h>
- #include <asm/io.h>
- #include <asm/desc.h>
- #include "segment_descriptor.h"
- MODULE_AUTHOR("Qumranet");
- MODULE_LICENSE("GPL");
- static DEFINE_PER_CPU(struct vmcs *, vmxarea);
- static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
- #ifdef CONFIG_X86_64
- #define HOST_IS_64 1
- #else
- #define HOST_IS_64 0
- #endif
- static struct vmcs_descriptor {
- int size;
- int order;
- u32 revision_id;
- } vmcs_descriptor;
- #define VMX_SEGMENT_FIELD(seg) \
- [VCPU_SREG_##seg] = { \
- .selector = GUEST_##seg##_SELECTOR, \
- .base = GUEST_##seg##_BASE, \
- .limit = GUEST_##seg##_LIMIT, \
- .ar_bytes = GUEST_##seg##_AR_BYTES, \
- }
- static struct kvm_vmx_segment_field {
- unsigned selector;
- unsigned base;
- unsigned limit;
- unsigned ar_bytes;
- } kvm_vmx_segment_fields[] = {
- VMX_SEGMENT_FIELD(CS),
- VMX_SEGMENT_FIELD(DS),
- VMX_SEGMENT_FIELD(ES),
- VMX_SEGMENT_FIELD(FS),
- VMX_SEGMENT_FIELD(GS),
- VMX_SEGMENT_FIELD(SS),
- VMX_SEGMENT_FIELD(TR),
- VMX_SEGMENT_FIELD(LDTR),
- };
- static const u32 vmx_msr_index[] = {
- #ifdef CONFIG_X86_64
- MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
- #endif
- MSR_EFER, MSR_K6_STAR,
- };
- #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
- static inline int is_page_fault(u32 intr_info)
- {
- return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
- INTR_INFO_VALID_MASK)) ==
- (INTR_TYPE_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
- }
- static inline int is_external_interrupt(u32 intr_info)
- {
- return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
- == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
- }
- static struct vmx_msr_entry *find_msr_entry(struct kvm_vcpu *vcpu, u32 msr)
- {
- int i;
- for (i = 0; i < vcpu->nmsrs; ++i)
- if (vcpu->guest_msrs[i].index == msr)
- return &vcpu->guest_msrs[i];
- return NULL;
- }
- static void vmcs_clear(struct vmcs *vmcs)
- {
- u64 phys_addr = __pa(vmcs);
- u8 error;
- asm volatile (ASM_VMX_VMCLEAR_RAX "; setna %0"
- : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
- : "cc", "memory");
- if (error)
- printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
- vmcs, phys_addr);
- }
- static void __vcpu_clear(void *arg)
- {
- struct kvm_vcpu *vcpu = arg;
- int cpu = raw_smp_processor_id();
- if (vcpu->cpu == cpu)
- vmcs_clear(vcpu->vmcs);
- if (per_cpu(current_vmcs, cpu) == vcpu->vmcs)
- per_cpu(current_vmcs, cpu) = NULL;
- }
- static void vcpu_clear(struct kvm_vcpu *vcpu)
- {
- if (vcpu->cpu != raw_smp_processor_id() && vcpu->cpu != -1)
- smp_call_function_single(vcpu->cpu, __vcpu_clear, vcpu, 0, 1);
- else
- __vcpu_clear(vcpu);
- vcpu->launched = 0;
- }
- static unsigned long vmcs_readl(unsigned long field)
- {
- unsigned long value;
- asm volatile (ASM_VMX_VMREAD_RDX_RAX
- : "=a"(value) : "d"(field) : "cc");
- return value;
- }
- static u16 vmcs_read16(unsigned long field)
- {
- return vmcs_readl(field);
- }
- static u32 vmcs_read32(unsigned long field)
- {
- return vmcs_readl(field);
- }
- static u64 vmcs_read64(unsigned long field)
- {
- #ifdef CONFIG_X86_64
- return vmcs_readl(field);
- #else
- return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
- #endif
- }
- static noinline void vmwrite_error(unsigned long field, unsigned long value)
- {
- printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
- field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
- dump_stack();
- }
- static void vmcs_writel(unsigned long field, unsigned long value)
- {
- u8 error;
- asm volatile (ASM_VMX_VMWRITE_RAX_RDX "; setna %0"
- : "=q"(error) : "a"(value), "d"(field) : "cc" );
- if (unlikely(error))
- vmwrite_error(field, value);
- }
- static void vmcs_write16(unsigned long field, u16 value)
- {
- vmcs_writel(field, value);
- }
- static void vmcs_write32(unsigned long field, u32 value)
- {
- vmcs_writel(field, value);
- }
- static void vmcs_write64(unsigned long field, u64 value)
- {
- #ifdef CONFIG_X86_64
- vmcs_writel(field, value);
- #else
- vmcs_writel(field, value);
- asm volatile ("");
- vmcs_writel(field+1, value >> 32);
- #endif
- }
- /*
- * Switches to specified vcpu, until a matching vcpu_put(), but assumes
- * vcpu mutex is already taken.
- */
- static void vmx_vcpu_load(struct kvm_vcpu *vcpu)
- {
- u64 phys_addr = __pa(vcpu->vmcs);
- int cpu;
- cpu = get_cpu();
- if (vcpu->cpu != cpu)
- vcpu_clear(vcpu);
- if (per_cpu(current_vmcs, cpu) != vcpu->vmcs) {
- u8 error;
- per_cpu(current_vmcs, cpu) = vcpu->vmcs;
- asm volatile (ASM_VMX_VMPTRLD_RAX "; setna %0"
- : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
- : "cc");
- if (error)
- printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
- vcpu->vmcs, phys_addr);
- }
- if (vcpu->cpu != cpu) {
- struct descriptor_table dt;
- unsigned long sysenter_esp;
- vcpu->cpu = cpu;
- /*
- * Linux uses per-cpu TSS and GDT, so set these when switching
- * processors.
- */
- vmcs_writel(HOST_TR_BASE, read_tr_base()); /* 22.2.4 */
- get_gdt(&dt);
- vmcs_writel(HOST_GDTR_BASE, dt.base); /* 22.2.4 */
- rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
- vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
- }
- }
- static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
- {
- put_cpu();
- }
- static void vmx_vcpu_decache(struct kvm_vcpu *vcpu)
- {
- vcpu_clear(vcpu);
- }
- static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
- {
- return vmcs_readl(GUEST_RFLAGS);
- }
- static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
- {
- vmcs_writel(GUEST_RFLAGS, rflags);
- }
- static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
- {
- unsigned long rip;
- u32 interruptibility;
- rip = vmcs_readl(GUEST_RIP);
- rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
- vmcs_writel(GUEST_RIP, rip);
- /*
- * We emulated an instruction, so temporary interrupt blocking
- * should be removed, if set.
- */
- interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
- if (interruptibility & 3)
- vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
- interruptibility & ~3);
- vcpu->interrupt_window_open = 1;
- }
- static void vmx_inject_gp(struct kvm_vcpu *vcpu, unsigned error_code)
- {
- printk(KERN_DEBUG "inject_general_protection: rip 0x%lx\n",
- vmcs_readl(GUEST_RIP));
- vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
- GP_VECTOR |
- INTR_TYPE_EXCEPTION |
- INTR_INFO_DELIEVER_CODE_MASK |
- INTR_INFO_VALID_MASK);
- }
- /*
- * reads and returns guest's timestamp counter "register"
- * guest_tsc = host_tsc + tsc_offset -- 21.3
- */
- static u64 guest_read_tsc(void)
- {
- u64 host_tsc, tsc_offset;
- rdtscll(host_tsc);
- tsc_offset = vmcs_read64(TSC_OFFSET);
- return host_tsc + tsc_offset;
- }
- /*
- * writes 'guest_tsc' into guest's timestamp counter "register"
- * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
- */
- static void guest_write_tsc(u64 guest_tsc)
- {
- u64 host_tsc;
- rdtscll(host_tsc);
- vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
- }
- static void reload_tss(void)
- {
- #ifndef CONFIG_X86_64
- /*
- * VT restores TR but not its size. Useless.
- */
- struct descriptor_table gdt;
- struct segment_descriptor *descs;
- get_gdt(&gdt);
- descs = (void *)gdt.base;
- descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
- load_TR_desc();
- #endif
- }
- /*
- * Reads an msr value (of 'msr_index') into 'pdata'.
- * Returns 0 on success, non-0 otherwise.
- * Assumes vcpu_load() was already called.
- */
- static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
- {
- u64 data;
- struct vmx_msr_entry *msr;
- if (!pdata) {
- printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
- return -EINVAL;
- }
- switch (msr_index) {
- #ifdef CONFIG_X86_64
- case MSR_FS_BASE:
- data = vmcs_readl(GUEST_FS_BASE);
- break;
- case MSR_GS_BASE:
- data = vmcs_readl(GUEST_GS_BASE);
- break;
- case MSR_EFER:
- return kvm_get_msr_common(vcpu, msr_index, pdata);
- #endif
- case MSR_IA32_TIME_STAMP_COUNTER:
- data = guest_read_tsc();
- break;
- case MSR_IA32_SYSENTER_CS:
- data = vmcs_read32(GUEST_SYSENTER_CS);
- break;
- case MSR_IA32_SYSENTER_EIP:
- data = vmcs_readl(GUEST_SYSENTER_EIP);
- break;
- case MSR_IA32_SYSENTER_ESP:
- data = vmcs_readl(GUEST_SYSENTER_ESP);
- break;
- default:
- msr = find_msr_entry(vcpu, msr_index);
- if (msr) {
- data = msr->data;
- break;
- }
- return kvm_get_msr_common(vcpu, msr_index, pdata);
- }
- *pdata = data;
- return 0;
- }
- /*
- * Writes msr value into into the appropriate "register".
- * Returns 0 on success, non-0 otherwise.
- * Assumes vcpu_load() was already called.
- */
- static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
- {
- struct vmx_msr_entry *msr;
- switch (msr_index) {
- #ifdef CONFIG_X86_64
- case MSR_EFER:
- return kvm_set_msr_common(vcpu, msr_index, data);
- case MSR_FS_BASE:
- vmcs_writel(GUEST_FS_BASE, data);
- break;
- case MSR_GS_BASE:
- vmcs_writel(GUEST_GS_BASE, data);
- break;
- #endif
- case MSR_IA32_SYSENTER_CS:
- vmcs_write32(GUEST_SYSENTER_CS, data);
- break;
- case MSR_IA32_SYSENTER_EIP:
- vmcs_writel(GUEST_SYSENTER_EIP, data);
- break;
- case MSR_IA32_SYSENTER_ESP:
- vmcs_writel(GUEST_SYSENTER_ESP, data);
- break;
- case MSR_IA32_TIME_STAMP_COUNTER:
- guest_write_tsc(data);
- break;
- default:
- msr = find_msr_entry(vcpu, msr_index);
- if (msr) {
- msr->data = data;
- break;
- }
- return kvm_set_msr_common(vcpu, msr_index, data);
- msr->data = data;
- break;
- }
- return 0;
- }
- /*
- * Sync the rsp and rip registers into the vcpu structure. This allows
- * registers to be accessed by indexing vcpu->regs.
- */
- static void vcpu_load_rsp_rip(struct kvm_vcpu *vcpu)
- {
- vcpu->regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
- vcpu->rip = vmcs_readl(GUEST_RIP);
- }
- /*
- * Syncs rsp and rip back into the vmcs. Should be called after possible
- * modification.
- */
- static void vcpu_put_rsp_rip(struct kvm_vcpu *vcpu)
- {
- vmcs_writel(GUEST_RSP, vcpu->regs[VCPU_REGS_RSP]);
- vmcs_writel(GUEST_RIP, vcpu->rip);
- }
- static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg)
- {
- unsigned long dr7 = 0x400;
- u32 exception_bitmap;
- int old_singlestep;
- exception_bitmap = vmcs_read32(EXCEPTION_BITMAP);
- old_singlestep = vcpu->guest_debug.singlestep;
- vcpu->guest_debug.enabled = dbg->enabled;
- if (vcpu->guest_debug.enabled) {
- int i;
- dr7 |= 0x200; /* exact */
- for (i = 0; i < 4; ++i) {
- if (!dbg->breakpoints[i].enabled)
- continue;
- vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
- dr7 |= 2 << (i*2); /* global enable */
- dr7 |= 0 << (i*4+16); /* execution breakpoint */
- }
- exception_bitmap |= (1u << 1); /* Trap debug exceptions */
- vcpu->guest_debug.singlestep = dbg->singlestep;
- } else {
- exception_bitmap &= ~(1u << 1); /* Ignore debug exceptions */
- vcpu->guest_debug.singlestep = 0;
- }
- if (old_singlestep && !vcpu->guest_debug.singlestep) {
- unsigned long flags;
- flags = vmcs_readl(GUEST_RFLAGS);
- flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
- vmcs_writel(GUEST_RFLAGS, flags);
- }
- vmcs_write32(EXCEPTION_BITMAP, exception_bitmap);
- vmcs_writel(GUEST_DR7, dr7);
- return 0;
- }
- static __init int cpu_has_kvm_support(void)
- {
- unsigned long ecx = cpuid_ecx(1);
- return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */
- }
- static __init int vmx_disabled_by_bios(void)
- {
- u64 msr;
- rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
- return (msr & 5) == 1; /* locked but not enabled */
- }
- static void hardware_enable(void *garbage)
- {
- int cpu = raw_smp_processor_id();
- u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
- u64 old;
- rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
- if ((old & 5) != 5)
- /* enable and lock */
- wrmsrl(MSR_IA32_FEATURE_CONTROL, old | 5);
- write_cr4(read_cr4() | CR4_VMXE); /* FIXME: not cpu hotplug safe */
- asm volatile (ASM_VMX_VMXON_RAX : : "a"(&phys_addr), "m"(phys_addr)
- : "memory", "cc");
- }
- static void hardware_disable(void *garbage)
- {
- asm volatile (ASM_VMX_VMXOFF : : : "cc");
- }
- static __init void setup_vmcs_descriptor(void)
- {
- u32 vmx_msr_low, vmx_msr_high;
- rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
- vmcs_descriptor.size = vmx_msr_high & 0x1fff;
- vmcs_descriptor.order = get_order(vmcs_descriptor.size);
- vmcs_descriptor.revision_id = vmx_msr_low;
- }
- static struct vmcs *alloc_vmcs_cpu(int cpu)
- {
- int node = cpu_to_node(cpu);
- struct page *pages;
- struct vmcs *vmcs;
- pages = alloc_pages_node(node, GFP_KERNEL, vmcs_descriptor.order);
- if (!pages)
- return NULL;
- vmcs = page_address(pages);
- memset(vmcs, 0, vmcs_descriptor.size);
- vmcs->revision_id = vmcs_descriptor.revision_id; /* vmcs revision id */
- return vmcs;
- }
- static struct vmcs *alloc_vmcs(void)
- {
- return alloc_vmcs_cpu(raw_smp_processor_id());
- }
- static void free_vmcs(struct vmcs *vmcs)
- {
- free_pages((unsigned long)vmcs, vmcs_descriptor.order);
- }
- static __exit void free_kvm_area(void)
- {
- int cpu;
- for_each_online_cpu(cpu)
- free_vmcs(per_cpu(vmxarea, cpu));
- }
- extern struct vmcs *alloc_vmcs_cpu(int cpu);
- static __init int alloc_kvm_area(void)
- {
- int cpu;
- for_each_online_cpu(cpu) {
- struct vmcs *vmcs;
- vmcs = alloc_vmcs_cpu(cpu);
- if (!vmcs) {
- free_kvm_area();
- return -ENOMEM;
- }
- per_cpu(vmxarea, cpu) = vmcs;
- }
- return 0;
- }
- static __init int hardware_setup(void)
- {
- setup_vmcs_descriptor();
- return alloc_kvm_area();
- }
- static __exit void hardware_unsetup(void)
- {
- free_kvm_area();
- }
- static void update_exception_bitmap(struct kvm_vcpu *vcpu)
- {
- if (vcpu->rmode.active)
- vmcs_write32(EXCEPTION_BITMAP, ~0);
- else
- vmcs_write32(EXCEPTION_BITMAP, 1 << PF_VECTOR);
- }
- static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
- {
- struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
- if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
- vmcs_write16(sf->selector, save->selector);
- vmcs_writel(sf->base, save->base);
- vmcs_write32(sf->limit, save->limit);
- vmcs_write32(sf->ar_bytes, save->ar);
- } else {
- u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
- << AR_DPL_SHIFT;
- vmcs_write32(sf->ar_bytes, 0x93 | dpl);
- }
- }
- static void enter_pmode(struct kvm_vcpu *vcpu)
- {
- unsigned long flags;
- vcpu->rmode.active = 0;
- vmcs_writel(GUEST_TR_BASE, vcpu->rmode.tr.base);
- vmcs_write32(GUEST_TR_LIMIT, vcpu->rmode.tr.limit);
- vmcs_write32(GUEST_TR_AR_BYTES, vcpu->rmode.tr.ar);
- flags = vmcs_readl(GUEST_RFLAGS);
- flags &= ~(IOPL_MASK | X86_EFLAGS_VM);
- flags |= (vcpu->rmode.save_iopl << IOPL_SHIFT);
- vmcs_writel(GUEST_RFLAGS, flags);
- vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~CR4_VME_MASK) |
- (vmcs_readl(CR4_READ_SHADOW) & CR4_VME_MASK));
- update_exception_bitmap(vcpu);
- fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->rmode.es);
- fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->rmode.ds);
- fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->rmode.gs);
- fix_pmode_dataseg(VCPU_SREG_FS, &vcpu->rmode.fs);
- vmcs_write16(GUEST_SS_SELECTOR, 0);
- vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
- vmcs_write16(GUEST_CS_SELECTOR,
- vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
- vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
- }
- static int rmode_tss_base(struct kvm* kvm)
- {
- gfn_t base_gfn = kvm->memslots[0].base_gfn + kvm->memslots[0].npages - 3;
- return base_gfn << PAGE_SHIFT;
- }
- static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
- {
- struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
- save->selector = vmcs_read16(sf->selector);
- save->base = vmcs_readl(sf->base);
- save->limit = vmcs_read32(sf->limit);
- save->ar = vmcs_read32(sf->ar_bytes);
- vmcs_write16(sf->selector, vmcs_readl(sf->base) >> 4);
- vmcs_write32(sf->limit, 0xffff);
- vmcs_write32(sf->ar_bytes, 0xf3);
- }
- static void enter_rmode(struct kvm_vcpu *vcpu)
- {
- unsigned long flags;
- vcpu->rmode.active = 1;
- vcpu->rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
- vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
- vcpu->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
- vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
- vcpu->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
- vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
- flags = vmcs_readl(GUEST_RFLAGS);
- vcpu->rmode.save_iopl = (flags & IOPL_MASK) >> IOPL_SHIFT;
- flags |= IOPL_MASK | X86_EFLAGS_VM;
- vmcs_writel(GUEST_RFLAGS, flags);
- vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | CR4_VME_MASK);
- update_exception_bitmap(vcpu);
- vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
- vmcs_write32(GUEST_SS_LIMIT, 0xffff);
- vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
- vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
- vmcs_write32(GUEST_CS_LIMIT, 0xffff);
- vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
- fix_rmode_seg(VCPU_SREG_ES, &vcpu->rmode.es);
- fix_rmode_seg(VCPU_SREG_DS, &vcpu->rmode.ds);
- fix_rmode_seg(VCPU_SREG_GS, &vcpu->rmode.gs);
- fix_rmode_seg(VCPU_SREG_FS, &vcpu->rmode.fs);
- }
- #ifdef CONFIG_X86_64
- static void enter_lmode(struct kvm_vcpu *vcpu)
- {
- u32 guest_tr_ar;
- guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
- if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
- printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
- __FUNCTION__);
- vmcs_write32(GUEST_TR_AR_BYTES,
- (guest_tr_ar & ~AR_TYPE_MASK)
- | AR_TYPE_BUSY_64_TSS);
- }
- vcpu->shadow_efer |= EFER_LMA;
- find_msr_entry(vcpu, MSR_EFER)->data |= EFER_LMA | EFER_LME;
- vmcs_write32(VM_ENTRY_CONTROLS,
- vmcs_read32(VM_ENTRY_CONTROLS)
- | VM_ENTRY_CONTROLS_IA32E_MASK);
- }
- static void exit_lmode(struct kvm_vcpu *vcpu)
- {
- vcpu->shadow_efer &= ~EFER_LMA;
- vmcs_write32(VM_ENTRY_CONTROLS,
- vmcs_read32(VM_ENTRY_CONTROLS)
- & ~VM_ENTRY_CONTROLS_IA32E_MASK);
- }
- #endif
- static void vmx_decache_cr0_cr4_guest_bits(struct kvm_vcpu *vcpu)
- {
- vcpu->cr0 &= KVM_GUEST_CR0_MASK;
- vcpu->cr0 |= vmcs_readl(GUEST_CR0) & ~KVM_GUEST_CR0_MASK;
- vcpu->cr4 &= KVM_GUEST_CR4_MASK;
- vcpu->cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
- }
- static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
- {
- if (vcpu->rmode.active && (cr0 & CR0_PE_MASK))
- enter_pmode(vcpu);
- if (!vcpu->rmode.active && !(cr0 & CR0_PE_MASK))
- enter_rmode(vcpu);
- #ifdef CONFIG_X86_64
- if (vcpu->shadow_efer & EFER_LME) {
- if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK))
- enter_lmode(vcpu);
- if (is_paging(vcpu) && !(cr0 & CR0_PG_MASK))
- exit_lmode(vcpu);
- }
- #endif
- vmcs_writel(CR0_READ_SHADOW, cr0);
- vmcs_writel(GUEST_CR0,
- (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON);
- vcpu->cr0 = cr0;
- }
- /*
- * Used when restoring the VM to avoid corrupting segment registers
- */
- static void vmx_set_cr0_no_modeswitch(struct kvm_vcpu *vcpu, unsigned long cr0)
- {
- if (!vcpu->rmode.active && !(cr0 & CR0_PE_MASK))
- enter_rmode(vcpu);
- vcpu->rmode.active = ((cr0 & CR0_PE_MASK) == 0);
- update_exception_bitmap(vcpu);
- vmcs_writel(CR0_READ_SHADOW, cr0);
- vmcs_writel(GUEST_CR0,
- (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON);
- vcpu->cr0 = cr0;
- }
- static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
- {
- vmcs_writel(GUEST_CR3, cr3);
- }
- static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
- {
- vmcs_writel(CR4_READ_SHADOW, cr4);
- vmcs_writel(GUEST_CR4, cr4 | (vcpu->rmode.active ?
- KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON));
- vcpu->cr4 = cr4;
- }
- #ifdef CONFIG_X86_64
- static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
- {
- struct vmx_msr_entry *msr = find_msr_entry(vcpu, MSR_EFER);
- vcpu->shadow_efer = efer;
- if (efer & EFER_LMA) {
- vmcs_write32(VM_ENTRY_CONTROLS,
- vmcs_read32(VM_ENTRY_CONTROLS) |
- VM_ENTRY_CONTROLS_IA32E_MASK);
- msr->data = efer;
- } else {
- vmcs_write32(VM_ENTRY_CONTROLS,
- vmcs_read32(VM_ENTRY_CONTROLS) &
- ~VM_ENTRY_CONTROLS_IA32E_MASK);
- msr->data = efer & ~EFER_LME;
- }
- }
- #endif
- static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
- {
- struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
- return vmcs_readl(sf->base);
- }
- static void vmx_get_segment(struct kvm_vcpu *vcpu,
- struct kvm_segment *var, int seg)
- {
- struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
- u32 ar;
- var->base = vmcs_readl(sf->base);
- var->limit = vmcs_read32(sf->limit);
- var->selector = vmcs_read16(sf->selector);
- ar = vmcs_read32(sf->ar_bytes);
- if (ar & AR_UNUSABLE_MASK)
- ar = 0;
- var->type = ar & 15;
- var->s = (ar >> 4) & 1;
- var->dpl = (ar >> 5) & 3;
- var->present = (ar >> 7) & 1;
- var->avl = (ar >> 12) & 1;
- var->l = (ar >> 13) & 1;
- var->db = (ar >> 14) & 1;
- var->g = (ar >> 15) & 1;
- var->unusable = (ar >> 16) & 1;
- }
- static void vmx_set_segment(struct kvm_vcpu *vcpu,
- struct kvm_segment *var, int seg)
- {
- struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
- u32 ar;
- vmcs_writel(sf->base, var->base);
- vmcs_write32(sf->limit, var->limit);
- vmcs_write16(sf->selector, var->selector);
- if (var->unusable)
- ar = 1 << 16;
- else {
- ar = var->type & 15;
- ar |= (var->s & 1) << 4;
- ar |= (var->dpl & 3) << 5;
- ar |= (var->present & 1) << 7;
- ar |= (var->avl & 1) << 12;
- ar |= (var->l & 1) << 13;
- ar |= (var->db & 1) << 14;
- ar |= (var->g & 1) << 15;
- }
- if (ar == 0) /* a 0 value means unusable */
- ar = AR_UNUSABLE_MASK;
- vmcs_write32(sf->ar_bytes, ar);
- }
- static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
- {
- u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
- *db = (ar >> 14) & 1;
- *l = (ar >> 13) & 1;
- }
- static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
- {
- dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
- dt->base = vmcs_readl(GUEST_IDTR_BASE);
- }
- static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
- {
- vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
- vmcs_writel(GUEST_IDTR_BASE, dt->base);
- }
- static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
- {
- dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
- dt->base = vmcs_readl(GUEST_GDTR_BASE);
- }
- static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
- {
- vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
- vmcs_writel(GUEST_GDTR_BASE, dt->base);
- }
- static int init_rmode_tss(struct kvm* kvm)
- {
- struct page *p1, *p2, *p3;
- gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
- char *page;
- p1 = _gfn_to_page(kvm, fn++);
- p2 = _gfn_to_page(kvm, fn++);
- p3 = _gfn_to_page(kvm, fn);
- if (!p1 || !p2 || !p3) {
- kvm_printf(kvm,"%s: gfn_to_page failed\n", __FUNCTION__);
- return 0;
- }
- page = kmap_atomic(p1, KM_USER0);
- memset(page, 0, PAGE_SIZE);
- *(u16*)(page + 0x66) = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
- kunmap_atomic(page, KM_USER0);
- page = kmap_atomic(p2, KM_USER0);
- memset(page, 0, PAGE_SIZE);
- kunmap_atomic(page, KM_USER0);
- page = kmap_atomic(p3, KM_USER0);
- memset(page, 0, PAGE_SIZE);
- *(page + RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1) = ~0;
- kunmap_atomic(page, KM_USER0);
- return 1;
- }
- static void vmcs_write32_fixedbits(u32 msr, u32 vmcs_field, u32 val)
- {
- u32 msr_high, msr_low;
- rdmsr(msr, msr_low, msr_high);
- val &= msr_high;
- val |= msr_low;
- vmcs_write32(vmcs_field, val);
- }
- static void seg_setup(int seg)
- {
- struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
- vmcs_write16(sf->selector, 0);
- vmcs_writel(sf->base, 0);
- vmcs_write32(sf->limit, 0xffff);
- vmcs_write32(sf->ar_bytes, 0x93);
- }
- /*
- * Sets up the vmcs for emulated real mode.
- */
- static int vmx_vcpu_setup(struct kvm_vcpu *vcpu)
- {
- u32 host_sysenter_cs;
- u32 junk;
- unsigned long a;
- struct descriptor_table dt;
- int i;
- int ret = 0;
- int nr_good_msrs;
- extern asmlinkage void kvm_vmx_return(void);
- if (!init_rmode_tss(vcpu->kvm)) {
- ret = -ENOMEM;
- goto out;
- }
- memset(vcpu->regs, 0, sizeof(vcpu->regs));
- vcpu->regs[VCPU_REGS_RDX] = get_rdx_init_val();
- vcpu->cr8 = 0;
- vcpu->apic_base = 0xfee00000 |
- /*for vcpu 0*/ MSR_IA32_APICBASE_BSP |
- MSR_IA32_APICBASE_ENABLE;
- fx_init(vcpu);
- /*
- * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
- * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh.
- */
- vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
- vmcs_writel(GUEST_CS_BASE, 0x000f0000);
- vmcs_write32(GUEST_CS_LIMIT, 0xffff);
- vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
- seg_setup(VCPU_SREG_DS);
- seg_setup(VCPU_SREG_ES);
- seg_setup(VCPU_SREG_FS);
- seg_setup(VCPU_SREG_GS);
- seg_setup(VCPU_SREG_SS);
- vmcs_write16(GUEST_TR_SELECTOR, 0);
- vmcs_writel(GUEST_TR_BASE, 0);
- vmcs_write32(GUEST_TR_LIMIT, 0xffff);
- vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
- vmcs_write16(GUEST_LDTR_SELECTOR, 0);
- vmcs_writel(GUEST_LDTR_BASE, 0);
- vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
- vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
- vmcs_write32(GUEST_SYSENTER_CS, 0);
- vmcs_writel(GUEST_SYSENTER_ESP, 0);
- vmcs_writel(GUEST_SYSENTER_EIP, 0);
- vmcs_writel(GUEST_RFLAGS, 0x02);
- vmcs_writel(GUEST_RIP, 0xfff0);
- vmcs_writel(GUEST_RSP, 0);
- //todo: dr0 = dr1 = dr2 = dr3 = 0; dr6 = 0xffff0ff0
- vmcs_writel(GUEST_DR7, 0x400);
- vmcs_writel(GUEST_GDTR_BASE, 0);
- vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
- vmcs_writel(GUEST_IDTR_BASE, 0);
- vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
- vmcs_write32(GUEST_ACTIVITY_STATE, 0);
- vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
- vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
- /* I/O */
- vmcs_write64(IO_BITMAP_A, 0);
- vmcs_write64(IO_BITMAP_B, 0);
- guest_write_tsc(0);
- vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
- /* Special registers */
- vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
- /* Control */
- vmcs_write32_fixedbits(MSR_IA32_VMX_PINBASED_CTLS,
- PIN_BASED_VM_EXEC_CONTROL,
- PIN_BASED_EXT_INTR_MASK /* 20.6.1 */
- | PIN_BASED_NMI_EXITING /* 20.6.1 */
- );
- vmcs_write32_fixedbits(MSR_IA32_VMX_PROCBASED_CTLS,
- CPU_BASED_VM_EXEC_CONTROL,
- CPU_BASED_HLT_EXITING /* 20.6.2 */
- | CPU_BASED_CR8_LOAD_EXITING /* 20.6.2 */
- | CPU_BASED_CR8_STORE_EXITING /* 20.6.2 */
- | CPU_BASED_UNCOND_IO_EXITING /* 20.6.2 */
- | CPU_BASED_MOV_DR_EXITING
- | CPU_BASED_USE_TSC_OFFSETING /* 21.3 */
- );
- vmcs_write32(EXCEPTION_BITMAP, 1 << PF_VECTOR);
- vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
- vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0);
- vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */
- vmcs_writel(HOST_CR0, read_cr0()); /* 22.2.3 */
- vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */
- vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
- vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */
- vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
- vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */
- vmcs_write16(HOST_FS_SELECTOR, read_fs()); /* 22.2.4 */
- vmcs_write16(HOST_GS_SELECTOR, read_gs()); /* 22.2.4 */
- vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
- #ifdef CONFIG_X86_64
- rdmsrl(MSR_FS_BASE, a);
- vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
- rdmsrl(MSR_GS_BASE, a);
- vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
- #else
- vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
- vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
- #endif
- vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */
- get_idt(&dt);
- vmcs_writel(HOST_IDTR_BASE, dt.base); /* 22.2.4 */
- vmcs_writel(HOST_RIP, (unsigned long)kvm_vmx_return); /* 22.2.5 */
- rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
- vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
- rdmsrl(MSR_IA32_SYSENTER_ESP, a);
- vmcs_writel(HOST_IA32_SYSENTER_ESP, a); /* 22.2.3 */
- rdmsrl(MSR_IA32_SYSENTER_EIP, a);
- vmcs_writel(HOST_IA32_SYSENTER_EIP, a); /* 22.2.3 */
- for (i = 0; i < NR_VMX_MSR; ++i) {
- u32 index = vmx_msr_index[i];
- u32 data_low, data_high;
- u64 data;
- int j = vcpu->nmsrs;
- if (rdmsr_safe(index, &data_low, &data_high) < 0)
- continue;
- if (wrmsr_safe(index, data_low, data_high) < 0)
- continue;
- data = data_low | ((u64)data_high << 32);
- vcpu->host_msrs[j].index = index;
- vcpu->host_msrs[j].reserved = 0;
- vcpu->host_msrs[j].data = data;
- vcpu->guest_msrs[j] = vcpu->host_msrs[j];
- ++vcpu->nmsrs;
- }
- printk(KERN_DEBUG "kvm: msrs: %d\n", vcpu->nmsrs);
- nr_good_msrs = vcpu->nmsrs - NR_BAD_MSRS;
- vmcs_writel(VM_ENTRY_MSR_LOAD_ADDR,
- virt_to_phys(vcpu->guest_msrs + NR_BAD_MSRS));
- vmcs_writel(VM_EXIT_MSR_STORE_ADDR,
- virt_to_phys(vcpu->guest_msrs + NR_BAD_MSRS));
- vmcs_writel(VM_EXIT_MSR_LOAD_ADDR,
- virt_to_phys(vcpu->host_msrs + NR_BAD_MSRS));
- vmcs_write32_fixedbits(MSR_IA32_VMX_EXIT_CTLS, VM_EXIT_CONTROLS,
- (HOST_IS_64 << 9)); /* 22.2,1, 20.7.1 */
- vmcs_write32(VM_EXIT_MSR_STORE_COUNT, nr_good_msrs); /* 22.2.2 */
- vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, nr_good_msrs); /* 22.2.2 */
- vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, nr_good_msrs); /* 22.2.2 */
- /* 22.2.1, 20.8.1 */
- vmcs_write32_fixedbits(MSR_IA32_VMX_ENTRY_CTLS,
- VM_ENTRY_CONTROLS, 0);
- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */
- #ifdef CONFIG_X86_64
- vmcs_writel(VIRTUAL_APIC_PAGE_ADDR, 0);
- vmcs_writel(TPR_THRESHOLD, 0);
- #endif
- vmcs_writel(CR0_GUEST_HOST_MASK, KVM_GUEST_CR0_MASK);
- vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
- vcpu->cr0 = 0x60000010;
- vmx_set_cr0(vcpu, vcpu->cr0); // enter rmode
- vmx_set_cr4(vcpu, 0);
- #ifdef CONFIG_X86_64
- vmx_set_efer(vcpu, 0);
- #endif
- return 0;
- out:
- return ret;
- }
- static void inject_rmode_irq(struct kvm_vcpu *vcpu, int irq)
- {
- u16 ent[2];
- u16 cs;
- u16 ip;
- unsigned long flags;
- unsigned long ss_base = vmcs_readl(GUEST_SS_BASE);
- u16 sp = vmcs_readl(GUEST_RSP);
- u32 ss_limit = vmcs_read32(GUEST_SS_LIMIT);
- if (sp > ss_limit || sp - 6 > sp) {
- vcpu_printf(vcpu, "%s: #SS, rsp 0x%lx ss 0x%lx limit 0x%x\n",
- __FUNCTION__,
- vmcs_readl(GUEST_RSP),
- vmcs_readl(GUEST_SS_BASE),
- vmcs_read32(GUEST_SS_LIMIT));
- return;
- }
- if (kvm_read_guest(vcpu, irq * sizeof(ent), sizeof(ent), &ent) !=
- sizeof(ent)) {
- vcpu_printf(vcpu, "%s: read guest err\n", __FUNCTION__);
- return;
- }
- flags = vmcs_readl(GUEST_RFLAGS);
- cs = vmcs_readl(GUEST_CS_BASE) >> 4;
- ip = vmcs_readl(GUEST_RIP);
- if (kvm_write_guest(vcpu, ss_base + sp - 2, 2, &flags) != 2 ||
- kvm_write_guest(vcpu, ss_base + sp - 4, 2, &cs) != 2 ||
- kvm_write_guest(vcpu, ss_base + sp - 6, 2, &ip) != 2) {
- vcpu_printf(vcpu, "%s: write guest err\n", __FUNCTION__);
- return;
- }
- vmcs_writel(GUEST_RFLAGS, flags &
- ~( X86_EFLAGS_IF | X86_EFLAGS_AC | X86_EFLAGS_TF));
- vmcs_write16(GUEST_CS_SELECTOR, ent[1]) ;
- vmcs_writel(GUEST_CS_BASE, ent[1] << 4);
- vmcs_writel(GUEST_RIP, ent[0]);
- vmcs_writel(GUEST_RSP, (vmcs_readl(GUEST_RSP) & ~0xffff) | (sp - 6));
- }
- static void kvm_do_inject_irq(struct kvm_vcpu *vcpu)
- {
- int word_index = __ffs(vcpu->irq_summary);
- int bit_index = __ffs(vcpu->irq_pending[word_index]);
- int irq = word_index * BITS_PER_LONG + bit_index;
- clear_bit(bit_index, &vcpu->irq_pending[word_index]);
- if (!vcpu->irq_pending[word_index])
- clear_bit(word_index, &vcpu->irq_summary);
- if (vcpu->rmode.active) {
- inject_rmode_irq(vcpu, irq);
- return;
- }
- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
- irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
- }
- static void do_interrupt_requests(struct kvm_vcpu *vcpu,
- struct kvm_run *kvm_run)
- {
- u32 cpu_based_vm_exec_control;
- vcpu->interrupt_window_open =
- ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
- (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0);
- if (vcpu->interrupt_window_open &&
- vcpu->irq_summary &&
- !(vmcs_read32(VM_ENTRY_INTR_INFO_FIELD) & INTR_INFO_VALID_MASK))
- /*
- * If interrupts enabled, and not blocked by sti or mov ss. Good.
- */
- kvm_do_inject_irq(vcpu);
- cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
- if (!vcpu->interrupt_window_open &&
- (vcpu->irq_summary || kvm_run->request_interrupt_window))
- /*
- * Interrupts blocked. Wait for unblock.
- */
- cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
- else
- cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
- vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
- }
- static void kvm_guest_debug_pre(struct kvm_vcpu *vcpu)
- {
- struct kvm_guest_debug *dbg = &vcpu->guest_debug;
- set_debugreg(dbg->bp[0], 0);
- set_debugreg(dbg->bp[1], 1);
- set_debugreg(dbg->bp[2], 2);
- set_debugreg(dbg->bp[3], 3);
- if (dbg->singlestep) {
- unsigned long flags;
- flags = vmcs_readl(GUEST_RFLAGS);
- flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
- vmcs_writel(GUEST_RFLAGS, flags);
- }
- }
- static int handle_rmode_exception(struct kvm_vcpu *vcpu,
- int vec, u32 err_code)
- {
- if (!vcpu->rmode.active)
- return 0;
- if (vec == GP_VECTOR && err_code == 0)
- if (emulate_instruction(vcpu, NULL, 0, 0) == EMULATE_DONE)
- return 1;
- return 0;
- }
- static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- u32 intr_info, error_code;
- unsigned long cr2, rip;
- u32 vect_info;
- enum emulation_result er;
- int r;
- vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
- intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
- if ((vect_info & VECTORING_INFO_VALID_MASK) &&
- !is_page_fault(intr_info)) {
- printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
- "intr info 0x%x\n", __FUNCTION__, vect_info, intr_info);
- }
- if (is_external_interrupt(vect_info)) {
- int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
- set_bit(irq, vcpu->irq_pending);
- set_bit(irq / BITS_PER_LONG, &vcpu->irq_summary);
- }
- if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) { /* nmi */
- asm ("int $2");
- return 1;
- }
- error_code = 0;
- rip = vmcs_readl(GUEST_RIP);
- if (intr_info & INTR_INFO_DELIEVER_CODE_MASK)
- error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
- if (is_page_fault(intr_info)) {
- cr2 = vmcs_readl(EXIT_QUALIFICATION);
- spin_lock(&vcpu->kvm->lock);
- r = kvm_mmu_page_fault(vcpu, cr2, error_code);
- if (r < 0) {
- spin_unlock(&vcpu->kvm->lock);
- return r;
- }
- if (!r) {
- spin_unlock(&vcpu->kvm->lock);
- return 1;
- }
- er = emulate_instruction(vcpu, kvm_run, cr2, error_code);
- spin_unlock(&vcpu->kvm->lock);
- switch (er) {
- case EMULATE_DONE:
- return 1;
- case EMULATE_DO_MMIO:
- ++kvm_stat.mmio_exits;
- kvm_run->exit_reason = KVM_EXIT_MMIO;
- return 0;
- case EMULATE_FAIL:
- vcpu_printf(vcpu, "%s: emulate fail\n", __FUNCTION__);
- break;
- default:
- BUG();
- }
- }
- if (vcpu->rmode.active &&
- handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
- error_code))
- return 1;
- if ((intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK)) == (INTR_TYPE_EXCEPTION | 1)) {
- kvm_run->exit_reason = KVM_EXIT_DEBUG;
- return 0;
- }
- kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
- kvm_run->ex.exception = intr_info & INTR_INFO_VECTOR_MASK;
- kvm_run->ex.error_code = error_code;
- return 0;
- }
- static int handle_external_interrupt(struct kvm_vcpu *vcpu,
- struct kvm_run *kvm_run)
- {
- ++kvm_stat.irq_exits;
- return 1;
- }
- static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
- return 0;
- }
- static int get_io_count(struct kvm_vcpu *vcpu, u64 *count)
- {
- u64 inst;
- gva_t rip;
- int countr_size;
- int i, n;
- if ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_VM)) {
- countr_size = 2;
- } else {
- u32 cs_ar = vmcs_read32(GUEST_CS_AR_BYTES);
- countr_size = (cs_ar & AR_L_MASK) ? 8:
- (cs_ar & AR_DB_MASK) ? 4: 2;
- }
- rip = vmcs_readl(GUEST_RIP);
- if (countr_size != 8)
- rip += vmcs_readl(GUEST_CS_BASE);
- n = kvm_read_guest(vcpu, rip, sizeof(inst), &inst);
- for (i = 0; i < n; i++) {
- switch (((u8*)&inst)[i]) {
- case 0xf0:
- case 0xf2:
- case 0xf3:
- case 0x2e:
- case 0x36:
- case 0x3e:
- case 0x26:
- case 0x64:
- case 0x65:
- case 0x66:
- break;
- case 0x67:
- countr_size = (countr_size == 2) ? 4: (countr_size >> 1);
- default:
- goto done;
- }
- }
- return 0;
- done:
- countr_size *= 8;
- *count = vcpu->regs[VCPU_REGS_RCX] & (~0ULL >> (64 - countr_size));
- return 1;
- }
- static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- u64 exit_qualification;
- ++kvm_stat.io_exits;
- exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
- kvm_run->exit_reason = KVM_EXIT_IO;
- if (exit_qualification & 8)
- kvm_run->io.direction = KVM_EXIT_IO_IN;
- else
- kvm_run->io.direction = KVM_EXIT_IO_OUT;
- kvm_run->io.size = (exit_qualification & 7) + 1;
- kvm_run->io.string = (exit_qualification & 16) != 0;
- kvm_run->io.string_down
- = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
- kvm_run->io.rep = (exit_qualification & 32) != 0;
- kvm_run->io.port = exit_qualification >> 16;
- if (kvm_run->io.string) {
- if (!get_io_count(vcpu, &kvm_run->io.count))
- return 1;
- kvm_run->io.address = vmcs_readl(GUEST_LINEAR_ADDRESS);
- } else
- kvm_run->io.value = vcpu->regs[VCPU_REGS_RAX]; /* rax */
- return 0;
- }
- static void
- vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
- {
- /*
- * Patch in the VMCALL instruction:
- */
- hypercall[0] = 0x0f;
- hypercall[1] = 0x01;
- hypercall[2] = 0xc1;
- hypercall[3] = 0xc3;
- }
- static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- u64 exit_qualification;
- int cr;
- int reg;
- exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
- cr = exit_qualification & 15;
- reg = (exit_qualification >> 8) & 15;
- switch ((exit_qualification >> 4) & 3) {
- case 0: /* mov to cr */
- switch (cr) {
- case 0:
- vcpu_load_rsp_rip(vcpu);
- set_cr0(vcpu, vcpu->regs[reg]);
- skip_emulated_instruction(vcpu);
- return 1;
- case 3:
- vcpu_load_rsp_rip(vcpu);
- set_cr3(vcpu, vcpu->regs[reg]);
- skip_emulated_instruction(vcpu);
- return 1;
- case 4:
- vcpu_load_rsp_rip(vcpu);
- set_cr4(vcpu, vcpu->regs[reg]);
- skip_emulated_instruction(vcpu);
- return 1;
- case 8:
- vcpu_load_rsp_rip(vcpu);
- set_cr8(vcpu, vcpu->regs[reg]);
- skip_emulated_instruction(vcpu);
- return 1;
- };
- break;
- case 1: /*mov from cr*/
- switch (cr) {
- case 3:
- vcpu_load_rsp_rip(vcpu);
- vcpu->regs[reg] = vcpu->cr3;
- vcpu_put_rsp_rip(vcpu);
- skip_emulated_instruction(vcpu);
- return 1;
- case 8:
- printk(KERN_DEBUG "handle_cr: read CR8 "
- "cpu erratum AA15\n");
- vcpu_load_rsp_rip(vcpu);
- vcpu->regs[reg] = vcpu->cr8;
- vcpu_put_rsp_rip(vcpu);
- skip_emulated_instruction(vcpu);
- return 1;
- }
- break;
- case 3: /* lmsw */
- lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
- skip_emulated_instruction(vcpu);
- return 1;
- default:
- break;
- }
- kvm_run->exit_reason = 0;
- printk(KERN_ERR "kvm: unhandled control register: op %d cr %d\n",
- (int)(exit_qualification >> 4) & 3, cr);
- return 0;
- }
- static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- u64 exit_qualification;
- unsigned long val;
- int dr, reg;
- /*
- * FIXME: this code assumes the host is debugging the guest.
- * need to deal with guest debugging itself too.
- */
- exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
- dr = exit_qualification & 7;
- reg = (exit_qualification >> 8) & 15;
- vcpu_load_rsp_rip(vcpu);
- if (exit_qualification & 16) {
- /* mov from dr */
- switch (dr) {
- case 6:
- val = 0xffff0ff0;
- break;
- case 7:
- val = 0x400;
- break;
- default:
- val = 0;
- }
- vcpu->regs[reg] = val;
- } else {
- /* mov to dr */
- }
- vcpu_put_rsp_rip(vcpu);
- skip_emulated_instruction(vcpu);
- return 1;
- }
- static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- kvm_run->exit_reason = KVM_EXIT_CPUID;
- return 0;
- }
- static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- u32 ecx = vcpu->regs[VCPU_REGS_RCX];
- u64 data;
- if (vmx_get_msr(vcpu, ecx, &data)) {
- vmx_inject_gp(vcpu, 0);
- return 1;
- }
- /* FIXME: handling of bits 32:63 of rax, rdx */
- vcpu->regs[VCPU_REGS_RAX] = data & -1u;
- vcpu->regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
- skip_emulated_instruction(vcpu);
- return 1;
- }
- static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- u32 ecx = vcpu->regs[VCPU_REGS_RCX];
- u64 data = (vcpu->regs[VCPU_REGS_RAX] & -1u)
- | ((u64)(vcpu->regs[VCPU_REGS_RDX] & -1u) << 32);
- if (vmx_set_msr(vcpu, ecx, data) != 0) {
- vmx_inject_gp(vcpu, 0);
- return 1;
- }
- skip_emulated_instruction(vcpu);
- return 1;
- }
- static void post_kvm_run_save(struct kvm_vcpu *vcpu,
- struct kvm_run *kvm_run)
- {
- kvm_run->if_flag = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) != 0;
- kvm_run->cr8 = vcpu->cr8;
- kvm_run->apic_base = vcpu->apic_base;
- kvm_run->ready_for_interrupt_injection = (vcpu->interrupt_window_open &&
- vcpu->irq_summary == 0);
- }
- static int handle_interrupt_window(struct kvm_vcpu *vcpu,
- struct kvm_run *kvm_run)
- {
- /*
- * If the user space waits to inject interrupts, exit as soon as
- * possible
- */
- if (kvm_run->request_interrupt_window &&
- !vcpu->irq_summary) {
- kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
- ++kvm_stat.irq_window_exits;
- return 0;
- }
- return 1;
- }
- static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- skip_emulated_instruction(vcpu);
- if (vcpu->irq_summary)
- return 1;
- kvm_run->exit_reason = KVM_EXIT_HLT;
- ++kvm_stat.halt_exits;
- return 0;
- }
- static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- vmcs_writel(GUEST_RIP, vmcs_readl(GUEST_RIP)+3);
- return kvm_hypercall(vcpu, kvm_run);
- }
- /*
- * The exit handlers return 1 if the exit was handled fully and guest execution
- * may resume. Otherwise they set the kvm_run parameter to indicate what needs
- * to be done to userspace and return 0.
- */
- static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
- struct kvm_run *kvm_run) = {
- [EXIT_REASON_EXCEPTION_NMI] = handle_exception,
- [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt,
- [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault,
- [EXIT_REASON_IO_INSTRUCTION] = handle_io,
- [EXIT_REASON_CR_ACCESS] = handle_cr,
- [EXIT_REASON_DR_ACCESS] = handle_dr,
- [EXIT_REASON_CPUID] = handle_cpuid,
- [EXIT_REASON_MSR_READ] = handle_rdmsr,
- [EXIT_REASON_MSR_WRITE] = handle_wrmsr,
- [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window,
- [EXIT_REASON_HLT] = handle_halt,
- [EXIT_REASON_VMCALL] = handle_vmcall,
- };
- static const int kvm_vmx_max_exit_handlers =
- sizeof(kvm_vmx_exit_handlers) / sizeof(*kvm_vmx_exit_handlers);
- /*
- * The guest has exited. See if we can fix it or if we need userspace
- * assistance.
- */
- static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
- {
- u32 vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
- u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
- if ( (vectoring_info & VECTORING_INFO_VALID_MASK) &&
- exit_reason != EXIT_REASON_EXCEPTION_NMI )
- printk(KERN_WARNING "%s: unexpected, valid vectoring info and "
- "exit reason is 0x%x\n", __FUNCTION__, exit_reason);
- kvm_run->instruction_length = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
- if (exit_reason < kvm_vmx_max_exit_handlers
- && kvm_vmx_exit_handlers[exit_reason])
- return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run);
- else {
- kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
- kvm_run->hw.hardware_exit_reason = exit_reason;
- }
- return 0;
- }
- /*
- * Check if userspace requested an interrupt window, and that the
- * interrupt window is open.
- *
- * No need to exit to userspace if we already have an interrupt queued.
- */
- static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
- struct kvm_run *kvm_run)
- {
- return (!vcpu->irq_summary &&
- kvm_run->request_interrupt_window &&
- vcpu->interrupt_window_open &&
- (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF));
- }
- static int vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
- {
- u8 fail;
- u16 fs_sel, gs_sel, ldt_sel;
- int fs_gs_ldt_reload_needed;
- int r;
- again:
- /*
- * Set host fs and gs selectors. Unfortunately, 22.2.3 does not
- * allow segment selectors with cpl > 0 or ti == 1.
- */
- fs_sel = read_fs();
- gs_sel = read_gs();
- ldt_sel = read_ldt();
- fs_gs_ldt_reload_needed = (fs_sel & 7) | (gs_sel & 7) | ldt_sel;
- if (!fs_gs_ldt_reload_needed) {
- vmcs_write16(HOST_FS_SELECTOR, fs_sel);
- vmcs_write16(HOST_GS_SELECTOR, gs_sel);
- } else {
- vmcs_write16(HOST_FS_SELECTOR, 0);
- vmcs_write16(HOST_GS_SELECTOR, 0);
- }
- #ifdef CONFIG_X86_64
- vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
- vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
- #else
- vmcs_writel(HOST_FS_BASE, segment_base(fs_sel));
- vmcs_writel(HOST_GS_BASE, segment_base(gs_sel));
- #endif
- if (!vcpu->mmio_read_completed)
- do_interrupt_requests(vcpu, kvm_run);
- if (vcpu->guest_debug.enabled)
- kvm_guest_debug_pre(vcpu);
- fx_save(vcpu->host_fx_image);
- fx_restore(vcpu->guest_fx_image);
- save_msrs(vcpu->host_msrs, vcpu->nmsrs);
- load_msrs(vcpu->guest_msrs, NR_BAD_MSRS);
- asm (
- /* Store host registers */
- "pushf \n\t"
- #ifdef CONFIG_X86_64
- "push %%rax; push %%rbx; push %%rdx;"
- "push %%rsi; push %%rdi; push %%rbp;"
- "push %%r8; push %%r9; push %%r10; push %%r11;"
- "push %%r12; push %%r13; push %%r14; push %%r15;"
- "push %%rcx \n\t"
- ASM_VMX_VMWRITE_RSP_RDX "\n\t"
- #else
- "pusha; push %%ecx \n\t"
- ASM_VMX_VMWRITE_RSP_RDX "\n\t"
- #endif
- /* Check if vmlaunch of vmresume is needed */
- "cmp $0, %1 \n\t"
- /* Load guest registers. Don't clobber flags. */
- #ifdef CONFIG_X86_64
- "mov %c[cr2](%3), %%rax \n\t"
- "mov %%rax, %%cr2 \n\t"
- "mov %c[rax](%3), %%rax \n\t"
- "mov %c[rbx](%3), %%rbx \n\t"
- "mov %c[rdx](%3), %%rdx \n\t"
- "mov %c[rsi](%3), %%rsi \n\t"
- "mov %c[rdi](%3), %%rdi \n\t"
- "mov %c[rbp](%3), %%rbp \n\t"
- "mov %c[r8](%3), %%r8 \n\t"
- "mov %c[r9](%3), %%r9 \n\t"
- "mov %c[r10](%3), %%r10 \n\t"
- "mov %c[r11](%3), %%r11 \n\t"
- "mov %c[r12](%3), %%r12 \n\t"
- "mov %c[r13](%3), %%r13 \n\t"
- "mov %c[r14](%3), %%r14 \n\t"
- "mov %c[r15](%3), %%r15 \n\t"
- "mov %c[rcx](%3), %%rcx \n\t" /* kills %3 (rcx) */
- #else
- "mov %c[cr2](%3), %%eax \n\t"
- "mov %%eax, %%cr2 \n\t"
- "mov %c[rax](%3), %%eax \n\t"
- "mov %c[rbx](%3), %%ebx \n\t"
- "mov %c[rdx](%3), %%edx \n\t"
- "mov %c[rsi](%3), %%esi \n\t"
- "mov %c[rdi](%3), %%edi \n\t"
- "mov %c[rbp](%3), %%ebp \n\t"
- "mov %c[rcx](%3), %%ecx \n\t" /* kills %3 (ecx) */
- #endif
- /* Enter guest mode */
- "jne launched \n\t"
- ASM_VMX_VMLAUNCH "\n\t"
- "jmp kvm_vmx_return \n\t"
- "launched: " ASM_VMX_VMRESUME "\n\t"
- ".globl kvm_vmx_return \n\t"
- "kvm_vmx_return: "
- /* Save guest registers, load host registers, keep flags */
- #ifdef CONFIG_X86_64
- "xchg %3, (%%rsp) \n\t"
- "mov %%rax, %c[rax](%3) \n\t"
- "mov %%rbx, %c[rbx](%3) \n\t"
- "pushq (%%rsp); popq %c[rcx](%3) \n\t"
- "mov %%rdx, %c[rdx](%3) \n\t"
- "mov %%rsi, %c[rsi](%3) \n\t"
- "mov %%rdi, %c[rdi](%3) \n\t"
- "mov %%rbp, %c[rbp](%3) \n\t"
- "mov %%r8, %c[r8](%3) \n\t"
- "mov %%r9, %c[r9](%3) \n\t"
- "mov %%r10, %c[r10](%3) \n\t"
- "mov %%r11, %c[r11](%3) \n\t"
- "mov %%r12, %c[r12](%3) \n\t"
- "mov %%r13, %c[r13](%3) \n\t"
- "mov %%r14, %c[r14](%3) \n\t"
- "mov %%r15, %c[r15](%3) \n\t"
- "mov %%cr2, %%rax \n\t"
- "mov %%rax, %c[cr2](%3) \n\t"
- "mov (%%rsp), %3 \n\t"
- "pop %%rcx; pop %%r15; pop %%r14; pop %%r13; pop %%r12;"
- "pop %%r11; pop %%r10; pop %%r9; pop %%r8;"
- "pop %%rbp; pop %%rdi; pop %%rsi;"
- "pop %%rdx; pop %%rbx; pop %%rax \n\t"
- #else
- "xchg %3, (%%esp) \n\t"
- "mov %%eax, %c[rax](%3) \n\t"
- "mov %%ebx, %c[rbx](%3) \n\t"
- "pushl (%%esp); popl %c[rcx](%3) \n\t"
- "mov %%edx, %c[rdx](%3) \n\t"
- "mov %%esi, %c[rsi](%3) \n\t"
- "mov %%edi, %c[rdi](%3) \n\t"
- "mov %%ebp, %c[rbp](%3) \n\t"
- "mov %%cr2, %%eax \n\t"
- "mov %%eax, %c[cr2](%3) \n\t"
- "mov (%%esp), %3 \n\t"
- "pop %%ecx; popa \n\t"
- #endif
- "setbe %0 \n\t"
- "popf \n\t"
- : "=q" (fail)
- : "r"(vcpu->launched), "d"((unsigned long)HOST_RSP),
- "c"(vcpu),
- [rax]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RAX])),
- [rbx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBX])),
- [rcx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RCX])),
- [rdx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDX])),
- [rsi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RSI])),
- [rdi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDI])),
- [rbp]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBP])),
- #ifdef CONFIG_X86_64
- [r8 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R8 ])),
- [r9 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R9 ])),
- [r10]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R10])),
- [r11]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R11])),
- [r12]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R12])),
- [r13]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R13])),
- [r14]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R14])),
- [r15]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R15])),
- #endif
- [cr2]"i"(offsetof(struct kvm_vcpu, cr2))
- : "cc", "memory" );
- /*
- * Reload segment selectors ASAP. (it's needed for a functional
- * kernel: x86 relies on having __KERNEL_PDA in %fs and x86_64
- * relies on having 0 in %gs for the CPU PDA to work.)
- */
- if (fs_gs_ldt_reload_needed) {
- load_ldt(ldt_sel);
- load_fs(fs_sel);
- /*
- * If we have to reload gs, we must take care to
- * preserve our gs base.
- */
- local_irq_disable();
- load_gs(gs_sel);
- #ifdef CONFIG_X86_64
- wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
- #endif
- local_irq_enable();
- reload_tss();
- }
- ++kvm_stat.exits;
- save_msrs(vcpu->guest_msrs, NR_BAD_MSRS);
- load_msrs(vcpu->host_msrs, NR_BAD_MSRS);
- fx_save(vcpu->guest_fx_image);
- fx_restore(vcpu->host_fx_image);
- vcpu->interrupt_window_open = (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0;
- asm ("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
- kvm_run->exit_type = 0;
- if (fail) {
- kvm_run->exit_type = KVM_EXIT_TYPE_FAIL_ENTRY;
- kvm_run->exit_reason = vmcs_read32(VM_INSTRUCTION_ERROR);
- r = 0;
- } else {
- /*
- * Profile KVM exit RIPs:
- */
- if (unlikely(prof_on == KVM_PROFILING))
- profile_hit(KVM_PROFILING, (void *)vmcs_readl(GUEST_RIP));
- vcpu->launched = 1;
- kvm_run->exit_type = KVM_EXIT_TYPE_VM_EXIT;
- r = kvm_handle_exit(kvm_run, vcpu);
- if (r > 0) {
- /* Give scheduler a change to reschedule. */
- if (signal_pending(current)) {
- ++kvm_stat.signal_exits;
- post_kvm_run_save(vcpu, kvm_run);
- return -EINTR;
- }
- if (dm_request_for_irq_injection(vcpu, kvm_run)) {
- ++kvm_stat.request_irq_exits;
- post_kvm_run_save(vcpu, kvm_run);
- return -EINTR;
- }
- kvm_resched(vcpu);
- goto again;
- }
- }
- post_kvm_run_save(vcpu, kvm_run);
- return r;
- }
- static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
- {
- vmcs_writel(GUEST_CR3, vmcs_readl(GUEST_CR3));
- }
- static void vmx_inject_page_fault(struct kvm_vcpu *vcpu,
- unsigned long addr,
- u32 err_code)
- {
- u32 vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
- ++kvm_stat.pf_guest;
- if (is_page_fault(vect_info)) {
- printk(KERN_DEBUG "inject_page_fault: "
- "double fault 0x%lx @ 0x%lx\n",
- addr, vmcs_readl(GUEST_RIP));
- vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, 0);
- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
- DF_VECTOR |
- INTR_TYPE_EXCEPTION |
- INTR_INFO_DELIEVER_CODE_MASK |
- INTR_INFO_VALID_MASK);
- return;
- }
- vcpu->cr2 = addr;
- vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, err_code);
- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
- PF_VECTOR |
- INTR_TYPE_EXCEPTION |
- INTR_INFO_DELIEVER_CODE_MASK |
- INTR_INFO_VALID_MASK);
- }
- static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
- {
- if (vcpu->vmcs) {
- on_each_cpu(__vcpu_clear, vcpu, 0, 1);
- free_vmcs(vcpu->vmcs);
- vcpu->vmcs = NULL;
- }
- }
- static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
- {
- vmx_free_vmcs(vcpu);
- }
- static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
- {
- struct vmcs *vmcs;
- vcpu->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!vcpu->guest_msrs)
- return -ENOMEM;
- vcpu->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!vcpu->host_msrs)
- goto out_free_guest_msrs;
- vmcs = alloc_vmcs();
- if (!vmcs)
- goto out_free_msrs;
- vmcs_clear(vmcs);
- vcpu->vmcs = vmcs;
- vcpu->launched = 0;
- return 0;
- out_free_msrs:
- kfree(vcpu->host_msrs);
- vcpu->host_msrs = NULL;
- out_free_guest_msrs:
- kfree(vcpu->guest_msrs);
- vcpu->guest_msrs = NULL;
- return -ENOMEM;
- }
- static struct kvm_arch_ops vmx_arch_ops = {
- .cpu_has_kvm_support = cpu_has_kvm_support,
- .disabled_by_bios = vmx_disabled_by_bios,
- .hardware_setup = hardware_setup,
- .hardware_unsetup = hardware_unsetup,
- .hardware_enable = hardware_enable,
- .hardware_disable = hardware_disable,
- .vcpu_create = vmx_create_vcpu,
- .vcpu_free = vmx_free_vcpu,
- .vcpu_load = vmx_vcpu_load,
- .vcpu_put = vmx_vcpu_put,
- .vcpu_decache = vmx_vcpu_decache,
- .set_guest_debug = set_guest_debug,
- .get_msr = vmx_get_msr,
- .set_msr = vmx_set_msr,
- .get_segment_base = vmx_get_segment_base,
- .get_segment = vmx_get_segment,
- .set_segment = vmx_set_segment,
- .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
- .decache_cr0_cr4_guest_bits = vmx_decache_cr0_cr4_guest_bits,
- .set_cr0 = vmx_set_cr0,
- .set_cr0_no_modeswitch = vmx_set_cr0_no_modeswitch,
- .set_cr3 = vmx_set_cr3,
- .set_cr4 = vmx_set_cr4,
- #ifdef CONFIG_X86_64
- .set_efer = vmx_set_efer,
- #endif
- .get_idt = vmx_get_idt,
- .set_idt = vmx_set_idt,
- .get_gdt = vmx_get_gdt,
- .set_gdt = vmx_set_gdt,
- .cache_regs = vcpu_load_rsp_rip,
- .decache_regs = vcpu_put_rsp_rip,
- .get_rflags = vmx_get_rflags,
- .set_rflags = vmx_set_rflags,
- .tlb_flush = vmx_flush_tlb,
- .inject_page_fault = vmx_inject_page_fault,
- .inject_gp = vmx_inject_gp,
- .run = vmx_vcpu_run,
- .skip_emulated_instruction = skip_emulated_instruction,
- .vcpu_setup = vmx_vcpu_setup,
- .patch_hypercall = vmx_patch_hypercall,
- };
- static int __init vmx_init(void)
- {
- return kvm_init_arch(&vmx_arch_ops, THIS_MODULE);
- }
- static void __exit vmx_exit(void)
- {
- kvm_exit_arch();
- }
- module_init(vmx_init)
- module_exit(vmx_exit)
|