| /* |
| * Kernel-based Virtual Machine driver for Linux |
| * |
| * AMD SVM support |
| * |
| * Copyright (C) 2006 Qumranet, Inc. |
| * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
| * |
| * Authors: |
| * Yaniv Kamay <yaniv@qumranet.com> |
| * Avi Kivity <avi@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 <linux/kvm_host.h> |
| |
| #include "irq.h" |
| #include "mmu.h" |
| #include "kvm_cache_regs.h" |
| #include "x86.h" |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/vmalloc.h> |
| #include <linux/highmem.h> |
| #include <linux/sched.h> |
| #include <linux/ftrace_event.h> |
| #include <linux/slab.h> |
| |
| #include <asm/perf_event.h> |
| #include <asm/tlbflush.h> |
| #include <asm/desc.h> |
| #include <asm/kvm_para.h> |
| |
| #include <asm/virtext.h> |
| #include "trace.h" |
| |
| #define __ex(x) __kvm_handle_fault_on_reboot(x) |
| |
| MODULE_AUTHOR("Qumranet"); |
| MODULE_LICENSE("GPL"); |
| |
| #define IOPM_ALLOC_ORDER 2 |
| #define MSRPM_ALLOC_ORDER 1 |
| |
| #define SEG_TYPE_LDT 2 |
| #define SEG_TYPE_BUSY_TSS16 3 |
| |
| #define SVM_FEATURE_NPT (1 << 0) |
| #define SVM_FEATURE_LBRV (1 << 1) |
| #define SVM_FEATURE_SVML (1 << 2) |
| #define SVM_FEATURE_NRIP (1 << 3) |
| #define SVM_FEATURE_TSC_RATE (1 << 4) |
| #define SVM_FEATURE_VMCB_CLEAN (1 << 5) |
| #define SVM_FEATURE_FLUSH_ASID (1 << 6) |
| #define SVM_FEATURE_DECODE_ASSIST (1 << 7) |
| #define SVM_FEATURE_PAUSE_FILTER (1 << 10) |
| |
| #define NESTED_EXIT_HOST 0 /* Exit handled on host level */ |
| #define NESTED_EXIT_DONE 1 /* Exit caused nested vmexit */ |
| #define NESTED_EXIT_CONTINUE 2 /* Further checks needed */ |
| |
| #define DEBUGCTL_RESERVED_BITS (~(0x3fULL)) |
| |
| #define TSC_RATIO_RSVD 0xffffff0000000000ULL |
| #define TSC_RATIO_MIN 0x0000000000000001ULL |
| #define TSC_RATIO_MAX 0x000000ffffffffffULL |
| |
| static bool erratum_383_found __read_mostly; |
| |
| static const u32 host_save_user_msrs[] = { |
| #ifdef CONFIG_X86_64 |
| MSR_STAR, MSR_LSTAR, MSR_CSTAR, MSR_SYSCALL_MASK, MSR_KERNEL_GS_BASE, |
| MSR_FS_BASE, |
| #endif |
| MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, |
| }; |
| |
| #define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs) |
| |
| struct kvm_vcpu; |
| |
| struct nested_state { |
| struct vmcb *hsave; |
| u64 hsave_msr; |
| u64 vm_cr_msr; |
| u64 vmcb; |
| |
| /* These are the merged vectors */ |
| u32 *msrpm; |
| |
| /* gpa pointers to the real vectors */ |
| u64 vmcb_msrpm; |
| u64 vmcb_iopm; |
| |
| /* A VMEXIT is required but not yet emulated */ |
| bool exit_required; |
| |
| /* cache for intercepts of the guest */ |
| u32 intercept_cr; |
| u32 intercept_dr; |
| u32 intercept_exceptions; |
| u64 intercept; |
| |
| /* Nested Paging related state */ |
| u64 nested_cr3; |
| }; |
| |
| #define MSRPM_OFFSETS 16 |
| static u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly; |
| |
| struct vcpu_svm { |
| struct kvm_vcpu vcpu; |
| struct vmcb *vmcb; |
| unsigned long vmcb_pa; |
| struct svm_cpu_data *svm_data; |
| uint64_t asid_generation; |
| uint64_t sysenter_esp; |
| uint64_t sysenter_eip; |
| |
| u64 next_rip; |
| |
| u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS]; |
| struct { |
| u16 fs; |
| u16 gs; |
| u16 ldt; |
| u64 gs_base; |
| } host; |
| |
| u32 *msrpm; |
| |
| ulong nmi_iret_rip; |
| |
| struct nested_state nested; |
| |
| bool nmi_singlestep; |
| |
| unsigned int3_injected; |
| unsigned long int3_rip; |
| u32 apf_reason; |
| |
| u64 tsc_ratio; |
| }; |
| |
| static DEFINE_PER_CPU(u64, current_tsc_ratio); |
| #define TSC_RATIO_DEFAULT 0x0100000000ULL |
| |
| #define MSR_INVALID 0xffffffffU |
| |
| static struct svm_direct_access_msrs { |
| u32 index; /* Index of the MSR */ |
| bool always; /* True if intercept is always on */ |
| } direct_access_msrs[] = { |
| { .index = MSR_STAR, .always = true }, |
| { .index = MSR_IA32_SYSENTER_CS, .always = true }, |
| #ifdef CONFIG_X86_64 |
| { .index = MSR_GS_BASE, .always = true }, |
| { .index = MSR_FS_BASE, .always = true }, |
| { .index = MSR_KERNEL_GS_BASE, .always = true }, |
| { .index = MSR_LSTAR, .always = true }, |
| { .index = MSR_CSTAR, .always = true }, |
| { .index = MSR_SYSCALL_MASK, .always = true }, |
| #endif |
| { .index = MSR_IA32_LASTBRANCHFROMIP, .always = false }, |
| { .index = MSR_IA32_LASTBRANCHTOIP, .always = false }, |
| { .index = MSR_IA32_LASTINTFROMIP, .always = false }, |
| { .index = MSR_IA32_LASTINTTOIP, .always = false }, |
| { .index = MSR_INVALID, .always = false }, |
| }; |
| |
| /* enable NPT for AMD64 and X86 with PAE */ |
| #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE) |
| static bool npt_enabled = true; |
| #else |
| static bool npt_enabled; |
| #endif |
| static int npt = 1; |
| |
| module_param(npt, int, S_IRUGO); |
| |
| static int nested = 1; |
| module_param(nested, int, S_IRUGO); |
| |
| static void svm_flush_tlb(struct kvm_vcpu *vcpu); |
| static void svm_complete_interrupts(struct vcpu_svm *svm); |
| |
| static int nested_svm_exit_handled(struct vcpu_svm *svm); |
| static int nested_svm_intercept(struct vcpu_svm *svm); |
| static int nested_svm_vmexit(struct vcpu_svm *svm); |
| static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr, |
| bool has_error_code, u32 error_code); |
| static u64 __scale_tsc(u64 ratio, u64 tsc); |
| |
| enum { |
| VMCB_INTERCEPTS, /* Intercept vectors, TSC offset, |
| pause filter count */ |
| VMCB_PERM_MAP, /* IOPM Base and MSRPM Base */ |
| VMCB_ASID, /* ASID */ |
| VMCB_INTR, /* int_ctl, int_vector */ |
| VMCB_NPT, /* npt_en, nCR3, gPAT */ |
| VMCB_CR, /* CR0, CR3, CR4, EFER */ |
| VMCB_DR, /* DR6, DR7 */ |
| VMCB_DT, /* GDT, IDT */ |
| VMCB_SEG, /* CS, DS, SS, ES, CPL */ |
| VMCB_CR2, /* CR2 only */ |
| VMCB_LBR, /* DBGCTL, BR_FROM, BR_TO, LAST_EX_FROM, LAST_EX_TO */ |
| VMCB_DIRTY_MAX, |
| }; |
| |
| /* TPR and CR2 are always written before VMRUN */ |
| #define VMCB_ALWAYS_DIRTY_MASK ((1U << VMCB_INTR) | (1U << VMCB_CR2)) |
| |
| static inline void mark_all_dirty(struct vmcb *vmcb) |
| { |
| vmcb->control.clean = 0; |
| } |
| |
| static inline void mark_all_clean(struct vmcb *vmcb) |
| { |
| vmcb->control.clean = ((1 << VMCB_DIRTY_MAX) - 1) |
| & ~VMCB_ALWAYS_DIRTY_MASK; |
| } |
| |
| static inline void mark_dirty(struct vmcb *vmcb, int bit) |
| { |
| vmcb->control.clean &= ~(1 << bit); |
| } |
| |
| static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu) |
| { |
| return container_of(vcpu, struct vcpu_svm, vcpu); |
| } |
| |
| static void recalc_intercepts(struct vcpu_svm *svm) |
| { |
| struct vmcb_control_area *c, *h; |
| struct nested_state *g; |
| |
| mark_dirty(svm->vmcb, VMCB_INTERCEPTS); |
| |
| if (!is_guest_mode(&svm->vcpu)) |
| return; |
| |
| c = &svm->vmcb->control; |
| h = &svm->nested.hsave->control; |
| g = &svm->nested; |
| |
| c->intercept_cr = h->intercept_cr | g->intercept_cr; |
| c->intercept_dr = h->intercept_dr | g->intercept_dr; |
| c->intercept_exceptions = h->intercept_exceptions | g->intercept_exceptions; |
| c->intercept = h->intercept | g->intercept; |
| } |
| |
| static inline struct vmcb *get_host_vmcb(struct vcpu_svm *svm) |
| { |
| if (is_guest_mode(&svm->vcpu)) |
| return svm->nested.hsave; |
| else |
| return svm->vmcb; |
| } |
| |
| static inline void set_cr_intercept(struct vcpu_svm *svm, int bit) |
| { |
| struct vmcb *vmcb = get_host_vmcb(svm); |
| |
| vmcb->control.intercept_cr |= (1U << bit); |
| |
| recalc_intercepts(svm); |
| } |
| |
| static inline void clr_cr_intercept(struct vcpu_svm *svm, int bit) |
| { |
| struct vmcb *vmcb = get_host_vmcb(svm); |
| |
| vmcb->control.intercept_cr &= ~(1U << bit); |
| |
| recalc_intercepts(svm); |
| } |
| |
| static inline bool is_cr_intercept(struct vcpu_svm *svm, int bit) |
| { |
| struct vmcb *vmcb = get_host_vmcb(svm); |
| |
| return vmcb->control.intercept_cr & (1U << bit); |
| } |
| |
| static inline void set_dr_intercept(struct vcpu_svm *svm, int bit) |
| { |
| struct vmcb *vmcb = get_host_vmcb(svm); |
| |
| vmcb->control.intercept_dr |= (1U << bit); |
| |
| recalc_intercepts(svm); |
| } |
| |
| static inline void clr_dr_intercept(struct vcpu_svm *svm, int bit) |
| { |
| struct vmcb *vmcb = get_host_vmcb(svm); |
| |
| vmcb->control.intercept_dr &= ~(1U << bit); |
| |
| recalc_intercepts(svm); |
| } |
| |
| static inline void set_exception_intercept(struct vcpu_svm *svm, int bit) |
| { |
| struct vmcb *vmcb = get_host_vmcb(svm); |
| |
| vmcb->control.intercept_exceptions |= (1U << bit); |
| |
| recalc_intercepts(svm); |
| } |
| |
| static inline void clr_exception_intercept(struct vcpu_svm *svm, int bit) |
| { |
| struct vmcb *vmcb = get_host_vmcb(svm); |
| |
| vmcb->control.intercept_exceptions &= ~(1U << bit); |
| |
| recalc_intercepts(svm); |
| } |
| |
| static inline void set_intercept(struct vcpu_svm *svm, int bit) |
| { |
| struct vmcb *vmcb = get_host_vmcb(svm); |
| |
| vmcb->control.intercept |= (1ULL << bit); |
| |
| recalc_intercepts(svm); |
| } |
| |
| static inline void clr_intercept(struct vcpu_svm *svm, int bit) |
| { |
| struct vmcb *vmcb = get_host_vmcb(svm); |
| |
| vmcb->control.intercept &= ~(1ULL << bit); |
| |
| recalc_intercepts(svm); |
| } |
| |
| static inline void enable_gif(struct vcpu_svm *svm) |
| { |
| svm->vcpu.arch.hflags |= HF_GIF_MASK; |
| } |
| |
| static inline void disable_gif(struct vcpu_svm *svm) |
| { |
| svm->vcpu.arch.hflags &= ~HF_GIF_MASK; |
| } |
| |
| static inline bool gif_set(struct vcpu_svm *svm) |
| { |
| return !!(svm->vcpu.arch.hflags & HF_GIF_MASK); |
| } |
| |
| static unsigned long iopm_base; |
| |
| struct kvm_ldttss_desc { |
| u16 limit0; |
| u16 base0; |
| unsigned base1:8, type:5, dpl:2, p:1; |
| unsigned limit1:4, zero0:3, g:1, base2:8; |
| u32 base3; |
| u32 zero1; |
| } __attribute__((packed)); |
| |
| struct svm_cpu_data { |
| int cpu; |
| |
| u64 asid_generation; |
| u32 max_asid; |
| u32 next_asid; |
| struct kvm_ldttss_desc *tss_desc; |
| |
| struct page *save_area; |
| }; |
| |
| static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data); |
| |
| struct svm_init_data { |
| int cpu; |
| int r; |
| }; |
| |
| static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000}; |
| |
| #define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges) |
| #define MSRS_RANGE_SIZE 2048 |
| #define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2) |
| |
| static u32 svm_msrpm_offset(u32 msr) |
| { |
| u32 offset; |
| int i; |
| |
| for (i = 0; i < NUM_MSR_MAPS; i++) { |
| if (msr < msrpm_ranges[i] || |
| msr >= msrpm_ranges[i] + MSRS_IN_RANGE) |
| continue; |
| |
| offset = (msr - msrpm_ranges[i]) / 4; /* 4 msrs per u8 */ |
| offset += (i * MSRS_RANGE_SIZE); /* add range offset */ |
| |
| /* Now we have the u8 offset - but need the u32 offset */ |
| return offset / 4; |
| } |
| |
| /* MSR not in any range */ |
| return MSR_INVALID; |
| } |
| |
| #define MAX_INST_SIZE 15 |
| |
| static inline void clgi(void) |
| { |
| asm volatile (__ex(SVM_CLGI)); |
| } |
| |
| static inline void stgi(void) |
| { |
| asm volatile (__ex(SVM_STGI)); |
| } |
| |
| static inline void invlpga(unsigned long addr, u32 asid) |
| { |
| asm volatile (__ex(SVM_INVLPGA) : : "a"(addr), "c"(asid)); |
| } |
| |
| static int get_npt_level(void) |
| { |
| #ifdef CONFIG_X86_64 |
| return PT64_ROOT_LEVEL; |
| #else |
| return PT32E_ROOT_LEVEL; |
| #endif |
| } |
| |
| static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer) |
| { |
| vcpu->arch.efer = efer; |
| if (!npt_enabled && !(efer & EFER_LMA)) |
| efer &= ~EFER_LME; |
| |
| to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME; |
| mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR); |
| } |
| |
| static int is_external_interrupt(u32 info) |
| { |
| info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID; |
| return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR); |
| } |
| |
| static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| u32 ret = 0; |
| |
| if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) |
| ret |= KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS; |
| return ret & mask; |
| } |
| |
| static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| if (mask == 0) |
| svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK; |
| else |
| svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK; |
| |
| } |
| |
| static void skip_emulated_instruction(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| if (svm->vmcb->control.next_rip != 0) |
| svm->next_rip = svm->vmcb->control.next_rip; |
| |
| if (!svm->next_rip) { |
| if (emulate_instruction(vcpu, EMULTYPE_SKIP) != |
| EMULATE_DONE) |
| printk(KERN_DEBUG "%s: NOP\n", __func__); |
| return; |
| } |
| if (svm->next_rip - kvm_rip_read(vcpu) > MAX_INST_SIZE) |
| printk(KERN_ERR "%s: ip 0x%lx next 0x%llx\n", |
| __func__, kvm_rip_read(vcpu), svm->next_rip); |
| |
| kvm_rip_write(vcpu, svm->next_rip); |
| svm_set_interrupt_shadow(vcpu, 0); |
| } |
| |
| static void svm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr, |
| bool has_error_code, u32 error_code, |
| bool reinject) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| /* |
| * If we are within a nested VM we'd better #VMEXIT and let the guest |
| * handle the exception |
| */ |
| if (!reinject && |
| nested_svm_check_exception(svm, nr, has_error_code, error_code)) |
| return; |
| |
| if (nr == BP_VECTOR && !static_cpu_has(X86_FEATURE_NRIPS)) { |
| unsigned long rip, old_rip = kvm_rip_read(&svm->vcpu); |
| |
| /* |
| * For guest debugging where we have to reinject #BP if some |
| * INT3 is guest-owned: |
| * Emulate nRIP by moving RIP forward. Will fail if injection |
| * raises a fault that is not intercepted. Still better than |
| * failing in all cases. |
| */ |
| skip_emulated_instruction(&svm->vcpu); |
| rip = kvm_rip_read(&svm->vcpu); |
| svm->int3_rip = rip + svm->vmcb->save.cs.base; |
| svm->int3_injected = rip - old_rip; |
| } |
| |
| svm->vmcb->control.event_inj = nr |
| | SVM_EVTINJ_VALID |
| | (has_error_code ? SVM_EVTINJ_VALID_ERR : 0) |
| | SVM_EVTINJ_TYPE_EXEPT; |
| svm->vmcb->control.event_inj_err = error_code; |
| } |
| |
| static void svm_init_erratum_383(void) |
| { |
| u32 low, high; |
| int err; |
| u64 val; |
| |
| if (!cpu_has_amd_erratum(amd_erratum_383)) |
| return; |
| |
| /* Use _safe variants to not break nested virtualization */ |
| val = native_read_msr_safe(MSR_AMD64_DC_CFG, &err); |
| if (err) |
| return; |
| |
| val |= (1ULL << 47); |
| |
| low = lower_32_bits(val); |
| high = upper_32_bits(val); |
| |
| native_write_msr_safe(MSR_AMD64_DC_CFG, low, high); |
| |
| erratum_383_found = true; |
| } |
| |
| static int has_svm(void) |
| { |
| const char *msg; |
| |
| if (!cpu_has_svm(&msg)) { |
| printk(KERN_INFO "has_svm: %s\n", msg); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static void svm_hardware_disable(void *garbage) |
| { |
| /* Make sure we clean up behind us */ |
| if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) |
| wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT); |
| |
| cpu_svm_disable(); |
| |
| amd_pmu_disable_virt(); |
| } |
| |
| static int svm_hardware_enable(void *garbage) |
| { |
| |
| struct svm_cpu_data *sd; |
| uint64_t efer; |
| struct desc_ptr gdt_descr; |
| struct desc_struct *gdt; |
| int me = raw_smp_processor_id(); |
| |
| rdmsrl(MSR_EFER, efer); |
| if (efer & EFER_SVME) |
| return -EBUSY; |
| |
| if (!has_svm()) { |
| printk(KERN_ERR "svm_hardware_enable: err EOPNOTSUPP on %d\n", |
| me); |
| return -EINVAL; |
| } |
| sd = per_cpu(svm_data, me); |
| |
| if (!sd) { |
| printk(KERN_ERR "svm_hardware_enable: svm_data is NULL on %d\n", |
| me); |
| return -EINVAL; |
| } |
| |
| sd->asid_generation = 1; |
| sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1; |
| sd->next_asid = sd->max_asid + 1; |
| |
| native_store_gdt(&gdt_descr); |
| gdt = (struct desc_struct *)gdt_descr.address; |
| sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS); |
| |
| wrmsrl(MSR_EFER, efer | EFER_SVME); |
| |
| wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT); |
| |
| if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) { |
| wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT); |
| __get_cpu_var(current_tsc_ratio) = TSC_RATIO_DEFAULT; |
| } |
| |
| svm_init_erratum_383(); |
| |
| amd_pmu_enable_virt(); |
| |
| return 0; |
| } |
| |
| static void svm_cpu_uninit(int cpu) |
| { |
| struct svm_cpu_data *sd = per_cpu(svm_data, raw_smp_processor_id()); |
| |
| if (!sd) |
| return; |
| |
| per_cpu(svm_data, raw_smp_processor_id()) = NULL; |
| __free_page(sd->save_area); |
| kfree(sd); |
| } |
| |
| static int svm_cpu_init(int cpu) |
| { |
| struct svm_cpu_data *sd; |
| int r; |
| |
| sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL); |
| if (!sd) |
| return -ENOMEM; |
| sd->cpu = cpu; |
| sd->save_area = alloc_page(GFP_KERNEL); |
| r = -ENOMEM; |
| if (!sd->save_area) |
| goto err_1; |
| |
| per_cpu(svm_data, cpu) = sd; |
| |
| return 0; |
| |
| err_1: |
| kfree(sd); |
| return r; |
| |
| } |
| |
| static bool valid_msr_intercept(u32 index) |
| { |
| int i; |
| |
| for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) |
| if (direct_access_msrs[i].index == index) |
| return true; |
| |
| return false; |
| } |
| |
| static void set_msr_interception(u32 *msrpm, unsigned msr, |
| int read, int write) |
| { |
| u8 bit_read, bit_write; |
| unsigned long tmp; |
| u32 offset; |
| |
| /* |
| * If this warning triggers extend the direct_access_msrs list at the |
| * beginning of the file |
| */ |
| WARN_ON(!valid_msr_intercept(msr)); |
| |
| offset = svm_msrpm_offset(msr); |
| bit_read = 2 * (msr & 0x0f); |
| bit_write = 2 * (msr & 0x0f) + 1; |
| tmp = msrpm[offset]; |
| |
| BUG_ON(offset == MSR_INVALID); |
| |
| read ? clear_bit(bit_read, &tmp) : set_bit(bit_read, &tmp); |
| write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp); |
| |
| msrpm[offset] = tmp; |
| } |
| |
| static void svm_vcpu_init_msrpm(u32 *msrpm) |
| { |
| int i; |
| |
| memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER)); |
| |
| for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) { |
| if (!direct_access_msrs[i].always) |
| continue; |
| |
| set_msr_interception(msrpm, direct_access_msrs[i].index, 1, 1); |
| } |
| } |
| |
| static void add_msr_offset(u32 offset) |
| { |
| int i; |
| |
| for (i = 0; i < MSRPM_OFFSETS; ++i) { |
| |
| /* Offset already in list? */ |
| if (msrpm_offsets[i] == offset) |
| return; |
| |
| /* Slot used by another offset? */ |
| if (msrpm_offsets[i] != MSR_INVALID) |
| continue; |
| |
| /* Add offset to list */ |
| msrpm_offsets[i] = offset; |
| |
| return; |
| } |
| |
| /* |
| * If this BUG triggers the msrpm_offsets table has an overflow. Just |
| * increase MSRPM_OFFSETS in this case. |
| */ |
| BUG(); |
| } |
| |
| static void init_msrpm_offsets(void) |
| { |
| int i; |
| |
| memset(msrpm_offsets, 0xff, sizeof(msrpm_offsets)); |
| |
| for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) { |
| u32 offset; |
| |
| offset = svm_msrpm_offset(direct_access_msrs[i].index); |
| BUG_ON(offset == MSR_INVALID); |
| |
| add_msr_offset(offset); |
| } |
| } |
| |
| static void svm_enable_lbrv(struct vcpu_svm *svm) |
| { |
| u32 *msrpm = svm->msrpm; |
| |
| svm->vmcb->control.lbr_ctl = 1; |
| set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1); |
| set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1); |
| set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1); |
| set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1); |
| } |
| |
| static void svm_disable_lbrv(struct vcpu_svm *svm) |
| { |
| u32 *msrpm = svm->msrpm; |
| |
| svm->vmcb->control.lbr_ctl = 0; |
| set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0); |
| set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0); |
| set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0); |
| set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0); |
| } |
| |
| static __init int svm_hardware_setup(void) |
| { |
| int cpu; |
| struct page *iopm_pages; |
| void *iopm_va; |
| int r; |
| |
| iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER); |
| |
| if (!iopm_pages) |
| return -ENOMEM; |
| |
| iopm_va = page_address(iopm_pages); |
| memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER)); |
| iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT; |
| |
| init_msrpm_offsets(); |
| |
| if (boot_cpu_has(X86_FEATURE_NX)) |
| kvm_enable_efer_bits(EFER_NX); |
| |
| if (boot_cpu_has(X86_FEATURE_FXSR_OPT)) |
| kvm_enable_efer_bits(EFER_FFXSR); |
| |
| if (boot_cpu_has(X86_FEATURE_TSCRATEMSR)) { |
| u64 max; |
| |
| kvm_has_tsc_control = true; |
| |
| /* |
| * Make sure the user can only configure tsc_khz values that |
| * fit into a signed integer. |
| * A min value is not calculated needed because it will always |
| * be 1 on all machines and a value of 0 is used to disable |
| * tsc-scaling for the vcpu. |
| */ |
| max = min(0x7fffffffULL, __scale_tsc(tsc_khz, TSC_RATIO_MAX)); |
| |
| kvm_max_guest_tsc_khz = max; |
| } |
| |
| if (nested) { |
| printk(KERN_INFO "kvm: Nested Virtualization enabled\n"); |
| kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE); |
| } |
| |
| for_each_possible_cpu(cpu) { |
| r = svm_cpu_init(cpu); |
| if (r) |
| goto err; |
| } |
| |
| if (!boot_cpu_has(X86_FEATURE_NPT)) |
| npt_enabled = false; |
| |
| if (npt_enabled && !npt) { |
| printk(KERN_INFO "kvm: Nested Paging disabled\n"); |
| npt_enabled = false; |
| } |
| |
| if (npt_enabled) { |
| printk(KERN_INFO "kvm: Nested Paging enabled\n"); |
| kvm_enable_tdp(); |
| } else |
| kvm_disable_tdp(); |
| |
| return 0; |
| |
| err: |
| __free_pages(iopm_pages, IOPM_ALLOC_ORDER); |
| iopm_base = 0; |
| return r; |
| } |
| |
| static __exit void svm_hardware_unsetup(void) |
| { |
| int cpu; |
| |
| for_each_possible_cpu(cpu) |
| svm_cpu_uninit(cpu); |
| |
| __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER); |
| iopm_base = 0; |
| } |
| |
| static void init_seg(struct vmcb_seg *seg) |
| { |
| seg->selector = 0; |
| seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK | |
| SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */ |
| seg->limit = 0xffff; |
| seg->base = 0; |
| } |
| |
| static void init_sys_seg(struct vmcb_seg *seg, uint32_t type) |
| { |
| seg->selector = 0; |
| seg->attrib = SVM_SELECTOR_P_MASK | type; |
| seg->limit = 0xffff; |
| seg->base = 0; |
| } |
| |
| static u64 __scale_tsc(u64 ratio, u64 tsc) |
| { |
| u64 mult, frac, _tsc; |
| |
| mult = ratio >> 32; |
| frac = ratio & ((1ULL << 32) - 1); |
| |
| _tsc = tsc; |
| _tsc *= mult; |
| _tsc += (tsc >> 32) * frac; |
| _tsc += ((tsc & ((1ULL << 32) - 1)) * frac) >> 32; |
| |
| return _tsc; |
| } |
| |
| static u64 svm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| u64 _tsc = tsc; |
| |
| if (svm->tsc_ratio != TSC_RATIO_DEFAULT) |
| _tsc = __scale_tsc(svm->tsc_ratio, tsc); |
| |
| return _tsc; |
| } |
| |
| static void svm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| u64 ratio; |
| u64 khz; |
| |
| /* TSC scaling supported? */ |
| if (!boot_cpu_has(X86_FEATURE_TSCRATEMSR)) |
| return; |
| |
| /* TSC-Scaling disabled or guest TSC same frequency as host TSC? */ |
| if (user_tsc_khz == 0) { |
| vcpu->arch.virtual_tsc_khz = 0; |
| svm->tsc_ratio = TSC_RATIO_DEFAULT; |
| return; |
| } |
| |
| khz = user_tsc_khz; |
| |
| /* TSC scaling required - calculate ratio */ |
| ratio = khz << 32; |
| do_div(ratio, tsc_khz); |
| |
| if (ratio == 0 || ratio & TSC_RATIO_RSVD) { |
| WARN_ONCE(1, "Invalid TSC ratio - virtual-tsc-khz=%u\n", |
| user_tsc_khz); |
| return; |
| } |
| vcpu->arch.virtual_tsc_khz = user_tsc_khz; |
| svm->tsc_ratio = ratio; |
| } |
| |
| static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| u64 g_tsc_offset = 0; |
| |
| if (is_guest_mode(vcpu)) { |
| g_tsc_offset = svm->vmcb->control.tsc_offset - |
| svm->nested.hsave->control.tsc_offset; |
| svm->nested.hsave->control.tsc_offset = offset; |
| } |
| |
| svm->vmcb->control.tsc_offset = offset + g_tsc_offset; |
| |
| mark_dirty(svm->vmcb, VMCB_INTERCEPTS); |
| } |
| |
| static void svm_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm->vmcb->control.tsc_offset += adjustment; |
| if (is_guest_mode(vcpu)) |
| svm->nested.hsave->control.tsc_offset += adjustment; |
| mark_dirty(svm->vmcb, VMCB_INTERCEPTS); |
| } |
| |
| static u64 svm_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc) |
| { |
| u64 tsc; |
| |
| tsc = svm_scale_tsc(vcpu, native_read_tsc()); |
| |
| return target_tsc - tsc; |
| } |
| |
| static void init_vmcb(struct vcpu_svm *svm) |
| { |
| struct vmcb_control_area *control = &svm->vmcb->control; |
| struct vmcb_save_area *save = &svm->vmcb->save; |
| |
| svm->vcpu.fpu_active = 1; |
| svm->vcpu.arch.hflags = 0; |
| |
| set_cr_intercept(svm, INTERCEPT_CR0_READ); |
| set_cr_intercept(svm, INTERCEPT_CR3_READ); |
| set_cr_intercept(svm, INTERCEPT_CR4_READ); |
| set_cr_intercept(svm, INTERCEPT_CR0_WRITE); |
| set_cr_intercept(svm, INTERCEPT_CR3_WRITE); |
| set_cr_intercept(svm, INTERCEPT_CR4_WRITE); |
| set_cr_intercept(svm, INTERCEPT_CR8_WRITE); |
| |
| set_dr_intercept(svm, INTERCEPT_DR0_READ); |
| set_dr_intercept(svm, INTERCEPT_DR1_READ); |
| set_dr_intercept(svm, INTERCEPT_DR2_READ); |
| set_dr_intercept(svm, INTERCEPT_DR3_READ); |
| set_dr_intercept(svm, INTERCEPT_DR4_READ); |
| set_dr_intercept(svm, INTERCEPT_DR5_READ); |
| set_dr_intercept(svm, INTERCEPT_DR6_READ); |
| set_dr_intercept(svm, INTERCEPT_DR7_READ); |
| |
| set_dr_intercept(svm, INTERCEPT_DR0_WRITE); |
| set_dr_intercept(svm, INTERCEPT_DR1_WRITE); |
| set_dr_intercept(svm, INTERCEPT_DR2_WRITE); |
| set_dr_intercept(svm, INTERCEPT_DR3_WRITE); |
| set_dr_intercept(svm, INTERCEPT_DR4_WRITE); |
| set_dr_intercept(svm, INTERCEPT_DR5_WRITE); |
| set_dr_intercept(svm, INTERCEPT_DR6_WRITE); |
| set_dr_intercept(svm, INTERCEPT_DR7_WRITE); |
| |
| set_exception_intercept(svm, PF_VECTOR); |
| set_exception_intercept(svm, UD_VECTOR); |
| set_exception_intercept(svm, MC_VECTOR); |
| |
| set_intercept(svm, INTERCEPT_INTR); |
| set_intercept(svm, INTERCEPT_NMI); |
| set_intercept(svm, INTERCEPT_SMI); |
| set_intercept(svm, INTERCEPT_SELECTIVE_CR0); |
| set_intercept(svm, INTERCEPT_CPUID); |
| set_intercept(svm, INTERCEPT_INVD); |
| set_intercept(svm, INTERCEPT_HLT); |
| set_intercept(svm, INTERCEPT_INVLPG); |
| set_intercept(svm, INTERCEPT_INVLPGA); |
| set_intercept(svm, INTERCEPT_IOIO_PROT); |
| set_intercept(svm, INTERCEPT_MSR_PROT); |
| set_intercept(svm, INTERCEPT_TASK_SWITCH); |
| set_intercept(svm, INTERCEPT_SHUTDOWN); |
| set_intercept(svm, INTERCEPT_VMRUN); |
| set_intercept(svm, INTERCEPT_VMMCALL); |
| set_intercept(svm, INTERCEPT_VMLOAD); |
| set_intercept(svm, INTERCEPT_VMSAVE); |
| set_intercept(svm, INTERCEPT_STGI); |
| set_intercept(svm, INTERCEPT_CLGI); |
| set_intercept(svm, INTERCEPT_SKINIT); |
| set_intercept(svm, INTERCEPT_WBINVD); |
| set_intercept(svm, INTERCEPT_MONITOR); |
| set_intercept(svm, INTERCEPT_MWAIT); |
| set_intercept(svm, INTERCEPT_XSETBV); |
| |
| control->iopm_base_pa = iopm_base; |
| control->msrpm_base_pa = __pa(svm->msrpm); |
| control->int_ctl = V_INTR_MASKING_MASK; |
| |
| init_seg(&save->es); |
| init_seg(&save->ss); |
| init_seg(&save->ds); |
| init_seg(&save->fs); |
| init_seg(&save->gs); |
| |
| save->cs.selector = 0xf000; |
| /* Executable/Readable Code Segment */ |
| save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK | |
| SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK; |
| save->cs.limit = 0xffff; |
| /* |
| * cs.base should really be 0xffff0000, but vmx can't handle that, so |
| * be consistent with it. |
| * |
| * Replace when we have real mode working for vmx. |
| */ |
| save->cs.base = 0xf0000; |
| |
| save->gdtr.limit = 0xffff; |
| save->idtr.limit = 0xffff; |
| |
| init_sys_seg(&save->ldtr, SEG_TYPE_LDT); |
| init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16); |
| |
| svm_set_efer(&svm->vcpu, 0); |
| save->dr6 = 0xffff0ff0; |
| save->dr7 = 0x400; |
| kvm_set_rflags(&svm->vcpu, 2); |
| save->rip = 0x0000fff0; |
| svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip; |
| |
| /* |
| * This is the guest-visible cr0 value. |
| * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0. |
| */ |
| svm->vcpu.arch.cr0 = 0; |
| (void)kvm_set_cr0(&svm->vcpu, X86_CR0_NW | X86_CR0_CD | X86_CR0_ET); |
| |
| save->cr4 = X86_CR4_PAE; |
| /* rdx = ?? */ |
| |
| if (npt_enabled) { |
| /* Setup VMCB for Nested Paging */ |
| control->nested_ctl = 1; |
| clr_intercept(svm, INTERCEPT_INVLPG); |
| clr_exception_intercept(svm, PF_VECTOR); |
| clr_cr_intercept(svm, INTERCEPT_CR3_READ); |
| clr_cr_intercept(svm, INTERCEPT_CR3_WRITE); |
| save->g_pat = 0x0007040600070406ULL; |
| save->cr3 = 0; |
| save->cr4 = 0; |
| } |
| svm->asid_generation = 0; |
| |
| svm->nested.vmcb = 0; |
| svm->vcpu.arch.hflags = 0; |
| |
| if (boot_cpu_has(X86_FEATURE_PAUSEFILTER)) { |
| control->pause_filter_count = 3000; |
| set_intercept(svm, INTERCEPT_PAUSE); |
| } |
| |
| mark_all_dirty(svm->vmcb); |
| |
| enable_gif(svm); |
| } |
| |
| static int svm_vcpu_reset(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| init_vmcb(svm); |
| |
| if (!kvm_vcpu_is_bsp(vcpu)) { |
| kvm_rip_write(vcpu, 0); |
| svm->vmcb->save.cs.base = svm->vcpu.arch.sipi_vector << 12; |
| svm->vmcb->save.cs.selector = svm->vcpu.arch.sipi_vector << 8; |
| } |
| vcpu->arch.regs_avail = ~0; |
| vcpu->arch.regs_dirty = ~0; |
| |
| return 0; |
| } |
| |
| static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id) |
| { |
| struct vcpu_svm *svm; |
| struct page *page; |
| struct page *msrpm_pages; |
| struct page *hsave_page; |
| struct page *nested_msrpm_pages; |
| int err; |
| |
| svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); |
| if (!svm) { |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| svm->tsc_ratio = TSC_RATIO_DEFAULT; |
| |
| err = kvm_vcpu_init(&svm->vcpu, kvm, id); |
| if (err) |
| goto free_svm; |
| |
| err = -ENOMEM; |
| page = alloc_page(GFP_KERNEL); |
| if (!page) |
| goto uninit; |
| |
| msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER); |
| if (!msrpm_pages) |
| goto free_page1; |
| |
| nested_msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER); |
| if (!nested_msrpm_pages) |
| goto free_page2; |
| |
| hsave_page = alloc_page(GFP_KERNEL); |
| if (!hsave_page) |
| goto free_page3; |
| |
| svm->nested.hsave = page_address(hsave_page); |
| |
| svm->msrpm = page_address(msrpm_pages); |
| svm_vcpu_init_msrpm(svm->msrpm); |
| |
| svm->nested.msrpm = page_address(nested_msrpm_pages); |
| svm_vcpu_init_msrpm(svm->nested.msrpm); |
| |
| svm->vmcb = page_address(page); |
| clear_page(svm->vmcb); |
| svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT; |
| svm->asid_generation = 0; |
| init_vmcb(svm); |
| kvm_write_tsc(&svm->vcpu, 0); |
| |
| err = fx_init(&svm->vcpu); |
| if (err) |
| goto free_page4; |
| |
| svm->vcpu.arch.apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE; |
| if (kvm_vcpu_is_bsp(&svm->vcpu)) |
| svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP; |
| |
| return &svm->vcpu; |
| |
| free_page4: |
| __free_page(hsave_page); |
| free_page3: |
| __free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER); |
| free_page2: |
| __free_pages(msrpm_pages, MSRPM_ALLOC_ORDER); |
| free_page1: |
| __free_page(page); |
| uninit: |
| kvm_vcpu_uninit(&svm->vcpu); |
| free_svm: |
| kmem_cache_free(kvm_vcpu_cache, svm); |
| out: |
| return ERR_PTR(err); |
| } |
| |
| static void svm_free_vcpu(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| __free_page(pfn_to_page(svm->vmcb_pa >> PAGE_SHIFT)); |
| __free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER); |
| __free_page(virt_to_page(svm->nested.hsave)); |
| __free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER); |
| kvm_vcpu_uninit(vcpu); |
| kmem_cache_free(kvm_vcpu_cache, svm); |
| } |
| |
| static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| int i; |
| |
| if (unlikely(cpu != vcpu->cpu)) { |
| svm->asid_generation = 0; |
| mark_all_dirty(svm->vmcb); |
| } |
| |
| #ifdef CONFIG_X86_64 |
| rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host.gs_base); |
| #endif |
| savesegment(fs, svm->host.fs); |
| savesegment(gs, svm->host.gs); |
| svm->host.ldt = kvm_read_ldt(); |
| |
| for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++) |
| rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]); |
| |
| if (static_cpu_has(X86_FEATURE_TSCRATEMSR) && |
| svm->tsc_ratio != __get_cpu_var(current_tsc_ratio)) { |
| __get_cpu_var(current_tsc_ratio) = svm->tsc_ratio; |
| wrmsrl(MSR_AMD64_TSC_RATIO, svm->tsc_ratio); |
| } |
| } |
| |
| static void svm_vcpu_put(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| int i; |
| |
| ++vcpu->stat.host_state_reload; |
| kvm_load_ldt(svm->host.ldt); |
| #ifdef CONFIG_X86_64 |
| loadsegment(fs, svm->host.fs); |
| wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gs); |
| load_gs_index(svm->host.gs); |
| #else |
| #ifdef CONFIG_X86_32_LAZY_GS |
| loadsegment(gs, svm->host.gs); |
| #endif |
| #endif |
| for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++) |
| wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]); |
| } |
| |
| static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu) |
| { |
| return to_svm(vcpu)->vmcb->save.rflags; |
| } |
| |
| static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) |
| { |
| to_svm(vcpu)->vmcb->save.rflags = rflags; |
| } |
| |
| static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) |
| { |
| switch (reg) { |
| case VCPU_EXREG_PDPTR: |
| BUG_ON(!npt_enabled); |
| load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu)); |
| break; |
| default: |
| BUG(); |
| } |
| } |
| |
| static void svm_set_vintr(struct vcpu_svm *svm) |
| { |
| set_intercept(svm, INTERCEPT_VINTR); |
| } |
| |
| static void svm_clear_vintr(struct vcpu_svm *svm) |
| { |
| clr_intercept(svm, INTERCEPT_VINTR); |
| } |
| |
| static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg) |
| { |
| struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save; |
| |
| switch (seg) { |
| case VCPU_SREG_CS: return &save->cs; |
| case VCPU_SREG_DS: return &save->ds; |
| case VCPU_SREG_ES: return &save->es; |
| case VCPU_SREG_FS: return &save->fs; |
| case VCPU_SREG_GS: return &save->gs; |
| case VCPU_SREG_SS: return &save->ss; |
| case VCPU_SREG_TR: return &save->tr; |
| case VCPU_SREG_LDTR: return &save->ldtr; |
| } |
| BUG(); |
| return NULL; |
| } |
| |
| static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg) |
| { |
| struct vmcb_seg *s = svm_seg(vcpu, seg); |
| |
| return s->base; |
| } |
| |
| static void svm_get_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg) |
| { |
| struct vmcb_seg *s = svm_seg(vcpu, seg); |
| |
| var->base = s->base; |
| var->limit = s->limit; |
| var->selector = s->selector; |
| var->type = s->attrib & SVM_SELECTOR_TYPE_MASK; |
| var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1; |
| var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3; |
| var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1; |
| var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1; |
| var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1; |
| var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1; |
| var->g = (s->attrib >> SVM_SELECTOR_G_SHIFT) & 1; |
| |
| /* |
| * AMD's VMCB does not have an explicit unusable field, so emulate it |
| * for cross vendor migration purposes by "not present" |
| */ |
| var->unusable = !var->present || (var->type == 0); |
| |
| switch (seg) { |
| case VCPU_SREG_CS: |
| /* |
| * SVM always stores 0 for the 'G' bit in the CS selector in |
| * the VMCB on a VMEXIT. This hurts cross-vendor migration: |
| * Intel's VMENTRY has a check on the 'G' bit. |
| */ |
| var->g = s->limit > 0xfffff; |
| break; |
| case VCPU_SREG_TR: |
| /* |
| * Work around a bug where the busy flag in the tr selector |
| * isn't exposed |
| */ |
| var->type |= 0x2; |
| break; |
| case VCPU_SREG_DS: |
| case VCPU_SREG_ES: |
| case VCPU_SREG_FS: |
| case VCPU_SREG_GS: |
| /* |
| * The accessed bit must always be set in the segment |
| * descriptor cache, although it can be cleared in the |
| * descriptor, the cached bit always remains at 1. Since |
| * Intel has a check on this, set it here to support |
| * cross-vendor migration. |
| */ |
| if (!var->unusable) |
| var->type |= 0x1; |
| break; |
| case VCPU_SREG_SS: |
| /* |
| * On AMD CPUs sometimes the DB bit in the segment |
| * descriptor is left as 1, although the whole segment has |
| * been made unusable. Clear it here to pass an Intel VMX |
| * entry check when cross vendor migrating. |
| */ |
| if (var->unusable) |
| var->db = 0; |
| break; |
| } |
| } |
| |
| static int svm_get_cpl(struct kvm_vcpu *vcpu) |
| { |
| struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save; |
| |
| return save->cpl; |
| } |
| |
| static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| dt->size = svm->vmcb->save.idtr.limit; |
| dt->address = svm->vmcb->save.idtr.base; |
| } |
| |
| static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm->vmcb->save.idtr.limit = dt->size; |
| svm->vmcb->save.idtr.base = dt->address ; |
| mark_dirty(svm->vmcb, VMCB_DT); |
| } |
| |
| static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| dt->size = svm->vmcb->save.gdtr.limit; |
| dt->address = svm->vmcb->save.gdtr.base; |
| } |
| |
| static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm->vmcb->save.gdtr.limit = dt->size; |
| svm->vmcb->save.gdtr.base = dt->address ; |
| mark_dirty(svm->vmcb, VMCB_DT); |
| } |
| |
| static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu) |
| { |
| } |
| |
| static void svm_decache_cr3(struct kvm_vcpu *vcpu) |
| { |
| } |
| |
| static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) |
| { |
| } |
| |
| static void update_cr0_intercept(struct vcpu_svm *svm) |
| { |
| ulong gcr0 = svm->vcpu.arch.cr0; |
| u64 *hcr0 = &svm->vmcb->save.cr0; |
| |
| if (!svm->vcpu.fpu_active) |
| *hcr0 |= SVM_CR0_SELECTIVE_MASK; |
| else |
| *hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK) |
| | (gcr0 & SVM_CR0_SELECTIVE_MASK); |
| |
| mark_dirty(svm->vmcb, VMCB_CR); |
| |
| if (gcr0 == *hcr0 && svm->vcpu.fpu_active) { |
| clr_cr_intercept(svm, INTERCEPT_CR0_READ); |
| clr_cr_intercept(svm, INTERCEPT_CR0_WRITE); |
| } else { |
| set_cr_intercept(svm, INTERCEPT_CR0_READ); |
| set_cr_intercept(svm, INTERCEPT_CR0_WRITE); |
| } |
| } |
| |
| static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| #ifdef CONFIG_X86_64 |
| if (vcpu->arch.efer & EFER_LME) { |
| if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { |
| vcpu->arch.efer |= EFER_LMA; |
| svm->vmcb->save.efer |= EFER_LMA | EFER_LME; |
| } |
| |
| if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) { |
| vcpu->arch.efer &= ~EFER_LMA; |
| svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME); |
| } |
| } |
| #endif |
| vcpu->arch.cr0 = cr0; |
| |
| if (!npt_enabled) |
| cr0 |= X86_CR0_PG | X86_CR0_WP; |
| |
| if (!vcpu->fpu_active) |
| cr0 |= X86_CR0_TS; |
| /* |
| * re-enable caching here because the QEMU bios |
| * does not do it - this results in some delay at |
| * reboot |
| */ |
| cr0 &= ~(X86_CR0_CD | X86_CR0_NW); |
| svm->vmcb->save.cr0 = cr0; |
| mark_dirty(svm->vmcb, VMCB_CR); |
| update_cr0_intercept(svm); |
| } |
| |
| static int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) |
| { |
| unsigned long host_cr4_mce = read_cr4() & X86_CR4_MCE; |
| unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4; |
| |
| if (cr4 & X86_CR4_VMXE) |
| return 1; |
| |
| if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE)) |
| svm_flush_tlb(vcpu); |
| |
| vcpu->arch.cr4 = cr4; |
| if (!npt_enabled) |
| cr4 |= X86_CR4_PAE; |
| cr4 |= host_cr4_mce; |
| to_svm(vcpu)->vmcb->save.cr4 = cr4; |
| mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR); |
| return 0; |
| } |
| |
| static void svm_set_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| struct vmcb_seg *s = svm_seg(vcpu, seg); |
| |
| s->base = var->base; |
| s->limit = var->limit; |
| s->selector = var->selector; |
| if (var->unusable) |
| s->attrib = 0; |
| else { |
| s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK); |
| s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT; |
| s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT; |
| s->attrib |= (var->present & 1) << SVM_SELECTOR_P_SHIFT; |
| s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT; |
| s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT; |
| s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT; |
| s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT; |
| } |
| if (seg == VCPU_SREG_CS) |
| svm->vmcb->save.cpl |
| = (svm->vmcb->save.cs.attrib |
| >> SVM_SELECTOR_DPL_SHIFT) & 3; |
| |
| mark_dirty(svm->vmcb, VMCB_SEG); |
| } |
| |
| static void update_db_intercept(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| clr_exception_intercept(svm, DB_VECTOR); |
| clr_exception_intercept(svm, BP_VECTOR); |
| |
| if (svm->nmi_singlestep) |
| set_exception_intercept(svm, DB_VECTOR); |
| |
| if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) { |
| if (vcpu->guest_debug & |
| (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) |
| set_exception_intercept(svm, DB_VECTOR); |
| if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) |
| set_exception_intercept(svm, BP_VECTOR); |
| } else |
| vcpu->guest_debug = 0; |
| } |
| |
| static void svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) |
| svm->vmcb->save.dr7 = dbg->arch.debugreg[7]; |
| else |
| svm->vmcb->save.dr7 = vcpu->arch.dr7; |
| |
| mark_dirty(svm->vmcb, VMCB_DR); |
| |
| update_db_intercept(vcpu); |
| } |
| |
| static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd) |
| { |
| if (sd->next_asid > sd->max_asid) { |
| ++sd->asid_generation; |
| sd->next_asid = 1; |
| svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID; |
| } |
| |
| svm->asid_generation = sd->asid_generation; |
| svm->vmcb->control.asid = sd->next_asid++; |
| |
| mark_dirty(svm->vmcb, VMCB_ASID); |
| } |
| |
| static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm->vmcb->save.dr7 = value; |
| mark_dirty(svm->vmcb, VMCB_DR); |
| } |
| |
| static int pf_interception(struct vcpu_svm *svm) |
| { |
| u64 fault_address = svm->vmcb->control.exit_info_2; |
| u32 error_code; |
| int r = 1; |
| |
| switch (svm->apf_reason) { |
| default: |
| error_code = svm->vmcb->control.exit_info_1; |
| |
| trace_kvm_page_fault(fault_address, error_code); |
| if (!npt_enabled && kvm_event_needs_reinjection(&svm->vcpu)) |
| kvm_mmu_unprotect_page_virt(&svm->vcpu, fault_address); |
| r = kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code, |
| svm->vmcb->control.insn_bytes, |
| svm->vmcb->control.insn_len); |
| break; |
| case KVM_PV_REASON_PAGE_NOT_PRESENT: |
| svm->apf_reason = 0; |
| local_irq_disable(); |
| kvm_async_pf_task_wait(fault_address); |
| local_irq_enable(); |
| break; |
| case KVM_PV_REASON_PAGE_READY: |
| svm->apf_reason = 0; |
| local_irq_disable(); |
| kvm_async_pf_task_wake(fault_address); |
| local_irq_enable(); |
| break; |
| } |
| return r; |
| } |
| |
| static int db_interception(struct vcpu_svm *svm) |
| { |
| struct kvm_run *kvm_run = svm->vcpu.run; |
| |
| if (!(svm->vcpu.guest_debug & |
| (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) && |
| !svm->nmi_singlestep) { |
| kvm_queue_exception(&svm->vcpu, DB_VECTOR); |
| return 1; |
| } |
| |
| if (svm->nmi_singlestep) { |
| svm->nmi_singlestep = false; |
| if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP)) |
| svm->vmcb->save.rflags &= |
| ~(X86_EFLAGS_TF | X86_EFLAGS_RF); |
| update_db_intercept(&svm->vcpu); |
| } |
| |
| if (svm->vcpu.guest_debug & |
| (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) { |
| kvm_run->exit_reason = KVM_EXIT_DEBUG; |
| kvm_run->debug.arch.pc = |
| svm->vmcb->save.cs.base + svm->vmcb->save.rip; |
| kvm_run->debug.arch.exception = DB_VECTOR; |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int bp_interception(struct vcpu_svm *svm) |
| { |
| struct kvm_run *kvm_run = svm->vcpu.run; |
| |
| kvm_run->exit_reason = KVM_EXIT_DEBUG; |
| kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip; |
| kvm_run->debug.arch.exception = BP_VECTOR; |
| return 0; |
| } |
| |
| static int ud_interception(struct vcpu_svm *svm) |
| { |
| int er; |
| |
| er = emulate_instruction(&svm->vcpu, EMULTYPE_TRAP_UD); |
| if (er != EMULATE_DONE) |
| kvm_queue_exception(&svm->vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| static void svm_fpu_activate(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| clr_exception_intercept(svm, NM_VECTOR); |
| |
| svm->vcpu.fpu_active = 1; |
| update_cr0_intercept(svm); |
| } |
| |
| static int nm_interception(struct vcpu_svm *svm) |
| { |
| svm_fpu_activate(&svm->vcpu); |
| return 1; |
| } |
| |
| static bool is_erratum_383(void) |
| { |
| int err, i; |
| u64 value; |
| |
| if (!erratum_383_found) |
| return false; |
| |
| value = native_read_msr_safe(MSR_IA32_MC0_STATUS, &err); |
| if (err) |
| return false; |
| |
| /* Bit 62 may or may not be set for this mce */ |
| value &= ~(1ULL << 62); |
| |
| if (value != 0xb600000000010015ULL) |
| return false; |
| |
| /* Clear MCi_STATUS registers */ |
| for (i = 0; i < 6; ++i) |
| native_write_msr_safe(MSR_IA32_MCx_STATUS(i), 0, 0); |
| |
| value = native_read_msr_safe(MSR_IA32_MCG_STATUS, &err); |
| if (!err) { |
| u32 low, high; |
| |
| value &= ~(1ULL << 2); |
| low = lower_32_bits(value); |
| high = upper_32_bits(value); |
| |
| native_write_msr_safe(MSR_IA32_MCG_STATUS, low, high); |
| } |
| |
| /* Flush tlb to evict multi-match entries */ |
| __flush_tlb_all(); |
| |
| return true; |
| } |
| |
| static void svm_handle_mce(struct vcpu_svm *svm) |
| { |
| if (is_erratum_383()) { |
| /* |
| * Erratum 383 triggered. Guest state is corrupt so kill the |
| * guest. |
| */ |
| pr_err("KVM: Guest triggered AMD Erratum 383\n"); |
| |
| kvm_make_request(KVM_REQ_TRIPLE_FAULT, &svm->vcpu); |
| |
| return; |
| } |
| |
| /* |
| * On an #MC intercept the MCE handler is not called automatically in |
| * the host. So do it by hand here. |
| */ |
| asm volatile ( |
| "int $0x12\n"); |
| /* not sure if we ever come back to this point */ |
| |
| return; |
| } |
| |
| static int mc_interception(struct vcpu_svm *svm) |
| { |
| return 1; |
| } |
| |
| static int shutdown_interception(struct vcpu_svm *svm) |
| { |
| struct kvm_run *kvm_run = svm->vcpu.run; |
| |
| /* |
| * VMCB is undefined after a SHUTDOWN intercept |
| * so reinitialize it. |
| */ |
| clear_page(svm->vmcb); |
| init_vmcb(svm); |
| |
| kvm_run->exit_reason = KVM_EXIT_SHUTDOWN; |
| return 0; |
| } |
| |
| static int io_interception(struct vcpu_svm *svm) |
| { |
| struct kvm_vcpu *vcpu = &svm->vcpu; |
| u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */ |
| int size, in, string; |
| unsigned port; |
| |
| ++svm->vcpu.stat.io_exits; |
| string = (io_info & SVM_IOIO_STR_MASK) != 0; |
| in = (io_info & SVM_IOIO_TYPE_MASK) != 0; |
| if (string || in) |
| return emulate_instruction(vcpu, 0) == EMULATE_DONE; |
| |
| port = io_info >> 16; |
| size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT; |
| svm->next_rip = svm->vmcb->control.exit_info_2; |
| skip_emulated_instruction(&svm->vcpu); |
| |
| return kvm_fast_pio_out(vcpu, size, port); |
| } |
| |
| static int nmi_interception(struct vcpu_svm *svm) |
| { |
| return 1; |
| } |
| |
| static int intr_interception(struct vcpu_svm *svm) |
| { |
| ++svm->vcpu.stat.irq_exits; |
| return 1; |
| } |
| |
| static int nop_on_interception(struct vcpu_svm *svm) |
| { |
| return 1; |
| } |
| |
| static int halt_interception(struct vcpu_svm *svm) |
| { |
| svm->next_rip = kvm_rip_read(&svm->vcpu) + 1; |
| skip_emulated_instruction(&svm->vcpu); |
| return kvm_emulate_halt(&svm->vcpu); |
| } |
| |
| static int vmmcall_interception(struct vcpu_svm *svm) |
| { |
| svm->next_rip = kvm_rip_read(&svm->vcpu) + 3; |
| skip_emulated_instruction(&svm->vcpu); |
| kvm_emulate_hypercall(&svm->vcpu); |
| return 1; |
| } |
| |
| static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| return svm->nested.nested_cr3; |
| } |
| |
| static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| u64 cr3 = svm->nested.nested_cr3; |
| u64 pdpte; |
| int ret; |
| |
| ret = kvm_read_guest_page(vcpu->kvm, gpa_to_gfn(cr3), &pdpte, |
| offset_in_page(cr3) + index * 8, 8); |
| if (ret) |
| return 0; |
| return pdpte; |
| } |
| |
| static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu, |
| unsigned long root) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm->vmcb->control.nested_cr3 = root; |
| mark_dirty(svm->vmcb, VMCB_NPT); |
| svm_flush_tlb(vcpu); |
| } |
| |
| static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu, |
| struct x86_exception *fault) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm->vmcb->control.exit_code = SVM_EXIT_NPF; |
| svm->vmcb->control.exit_code_hi = 0; |
| svm->vmcb->control.exit_info_1 = fault->error_code; |
| svm->vmcb->control.exit_info_2 = fault->address; |
| |
| nested_svm_vmexit(svm); |
| } |
| |
| static int nested_svm_init_mmu_context(struct kvm_vcpu *vcpu) |
| { |
| int r; |
| |
| r = kvm_init_shadow_mmu(vcpu, &vcpu->arch.mmu); |
| |
| vcpu->arch.mmu.set_cr3 = nested_svm_set_tdp_cr3; |
| vcpu->arch.mmu.get_cr3 = nested_svm_get_tdp_cr3; |
| vcpu->arch.mmu.get_pdptr = nested_svm_get_tdp_pdptr; |
| vcpu->arch.mmu.inject_page_fault = nested_svm_inject_npf_exit; |
| vcpu->arch.mmu.shadow_root_level = get_npt_level(); |
| vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu; |
| |
| return r; |
| } |
| |
| static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu) |
| { |
| vcpu->arch.walk_mmu = &vcpu->arch.mmu; |
| } |
| |
| static int nested_svm_check_permissions(struct vcpu_svm *svm) |
| { |
| if (!(svm->vcpu.arch.efer & EFER_SVME) |
| || !is_paging(&svm->vcpu)) { |
| kvm_queue_exception(&svm->vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| if (svm->vmcb->save.cpl) { |
| kvm_inject_gp(&svm->vcpu, 0); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr, |
| bool has_error_code, u32 error_code) |
| { |
| int vmexit; |
| |
| if (!is_guest_mode(&svm->vcpu)) |
| return 0; |
| |
| svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr; |
| svm->vmcb->control.exit_code_hi = 0; |
| svm->vmcb->control.exit_info_1 = error_code; |
| svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2; |
| |
| vmexit = nested_svm_intercept(svm); |
| if (vmexit == NESTED_EXIT_DONE) |
| svm->nested.exit_required = true; |
| |
| return vmexit; |
| } |
| |
| /* This function returns true if it is save to enable the irq window */ |
| static inline bool nested_svm_intr(struct vcpu_svm *svm) |
| { |
| if (!is_guest_mode(&svm->vcpu)) |
| return true; |
| |
| if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK)) |
| return true; |
| |
| if (!(svm->vcpu.arch.hflags & HF_HIF_MASK)) |
| return false; |
| |
| /* |
| * if vmexit was already requested (by intercepted exception |
| * for instance) do not overwrite it with "external interrupt" |
| * vmexit. |
| */ |
| if (svm->nested.exit_required) |
| return false; |
| |
| svm->vmcb->control.exit_code = SVM_EXIT_INTR; |
| svm->vmcb->control.exit_info_1 = 0; |
| svm->vmcb->control.exit_info_2 = 0; |
| |
| if (svm->nested.intercept & 1ULL) { |
| /* |
| * The #vmexit can't be emulated here directly because this |
| * code path runs with irqs and preemtion disabled. A |
| * #vmexit emulation might sleep. Only signal request for |
| * the #vmexit here. |
| */ |
| svm->nested.exit_required = true; |
| trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /* This function returns true if it is save to enable the nmi window */ |
| static inline bool nested_svm_nmi(struct vcpu_svm *svm) |
| { |
| if (!is_guest_mode(&svm->vcpu)) |
| return true; |
| |
| if (!(svm->nested.intercept & (1ULL << INTERCEPT_NMI))) |
| return true; |
| |
| svm->vmcb->control.exit_code = SVM_EXIT_NMI; |
| svm->nested.exit_required = true; |
| |
| return false; |
| } |
| |
| static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, struct page **_page) |
| { |
| struct page *page; |
| |
| might_sleep(); |
| |
| page = gfn_to_page(svm->vcpu.kvm, gpa >> PAGE_SHIFT); |
| if (is_error_page(page)) |
| goto error; |
| |
| *_page = page; |
| |
| return kmap(page); |
| |
| error: |
| kvm_release_page_clean(page); |
| kvm_inject_gp(&svm->vcpu, 0); |
| |
| return NULL; |
| } |
| |
| static void nested_svm_unmap(struct page *page) |
| { |
| kunmap(page); |
| kvm_release_page_dirty(page); |
| } |
| |
| static int nested_svm_intercept_ioio(struct vcpu_svm *svm) |
| { |
| unsigned port; |
| u8 val, bit; |
| u64 gpa; |
| |
| if (!(svm->nested.intercept & (1ULL << INTERCEPT_IOIO_PROT))) |
| return NESTED_EXIT_HOST; |
| |
| port = svm->vmcb->control.exit_info_1 >> 16; |
| gpa = svm->nested.vmcb_iopm + (port / 8); |
| bit = port % 8; |
| val = 0; |
| |
| if (kvm_read_guest(svm->vcpu.kvm, gpa, &val, 1)) |
| val &= (1 << bit); |
| |
| return val ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; |
| } |
| |
| static int nested_svm_exit_handled_msr(struct vcpu_svm *svm) |
| { |
| u32 offset, msr, value; |
| int write, mask; |
| |
| if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT))) |
| return NESTED_EXIT_HOST; |
| |
| msr = svm->vcpu.arch.regs[VCPU_REGS_RCX]; |
| offset = svm_msrpm_offset(msr); |
| write = svm->vmcb->control.exit_info_1 & 1; |
| mask = 1 << ((2 * (msr & 0xf)) + write); |
| |
| if (offset == MSR_INVALID) |
| return NESTED_EXIT_DONE; |
| |
| /* Offset is in 32 bit units but need in 8 bit units */ |
| offset *= 4; |
| |
| if (kvm_read_guest(svm->vcpu.kvm, svm->nested.vmcb_msrpm + offset, &value, 4)) |
| return NESTED_EXIT_DONE; |
| |
| return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; |
| } |
| |
| static int nested_svm_exit_special(struct vcpu_svm *svm) |
| { |
| u32 exit_code = svm->vmcb->control.exit_code; |
| |
| switch (exit_code) { |
| case SVM_EXIT_INTR: |
| case SVM_EXIT_NMI: |
| case SVM_EXIT_EXCP_BASE + MC_VECTOR: |
| return NESTED_EXIT_HOST; |
| case SVM_EXIT_NPF: |
| /* For now we are always handling NPFs when using them */ |
| if (npt_enabled) |
| return NESTED_EXIT_HOST; |
| break; |
| case SVM_EXIT_EXCP_BASE + PF_VECTOR: |
| /* When we're shadowing, trap PFs, but not async PF */ |
| if (!npt_enabled && svm->apf_reason == 0) |
| return NESTED_EXIT_HOST; |
| break; |
| case SVM_EXIT_EXCP_BASE + NM_VECTOR: |
| nm_interception(svm); |
| break; |
| default: |
| break; |
| } |
| |
| return NESTED_EXIT_CONTINUE; |
| } |
| |
| /* |
| * If this function returns true, this #vmexit was already handled |
| */ |
| static int nested_svm_intercept(struct vcpu_svm *svm) |
| { |
| u32 exit_code = svm->vmcb->control.exit_code; |
| int vmexit = NESTED_EXIT_HOST; |
| |
| switch (exit_code) { |
| case SVM_EXIT_MSR: |
| vmexit = nested_svm_exit_handled_msr(svm); |
| break; |
| case SVM_EXIT_IOIO: |
| vmexit = nested_svm_intercept_ioio(svm); |
| break; |
| case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: { |
| u32 bit = 1U << (exit_code - SVM_EXIT_READ_CR0); |
| if (svm->nested.intercept_cr & bit) |
| vmexit = NESTED_EXIT_DONE; |
| break; |
| } |
| case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: { |
| u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0); |
| if (svm->nested.intercept_dr & bit) |
| vmexit = NESTED_EXIT_DONE; |
| break; |
| } |
| case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { |
| u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE); |
| if (svm->nested.intercept_exceptions & excp_bits) |
| vmexit = NESTED_EXIT_DONE; |
| /* async page fault always cause vmexit */ |
| else if ((exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR) && |
| svm->apf_reason != 0) |
| vmexit = NESTED_EXIT_DONE; |
| break; |
| } |
| case SVM_EXIT_ERR: { |
| vmexit = NESTED_EXIT_DONE; |
| break; |
| } |
| default: { |
| u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR); |
| if (svm->nested.intercept & exit_bits) |
| vmexit = NESTED_EXIT_DONE; |
| } |
| } |
| |
| return vmexit; |
| } |
| |
| static int nested_svm_exit_handled(struct vcpu_svm *svm) |
| { |
| int vmexit; |
| |
| vmexit = nested_svm_intercept(svm); |
| |
| if (vmexit == NESTED_EXIT_DONE) |
| nested_svm_vmexit(svm); |
| |
| return vmexit; |
| } |
| |
| static inline void copy_vmcb_control_area(struct vmcb *dst_vmcb, struct vmcb *from_vmcb) |
| { |
| struct vmcb_control_area *dst = &dst_vmcb->control; |
| struct vmcb_control_area *from = &from_vmcb->control; |
| |
| dst->intercept_cr = from->intercept_cr; |
| dst->intercept_dr = from->intercept_dr; |
| dst->intercept_exceptions = from->intercept_exceptions; |
| dst->intercept = from->intercept; |
| dst->iopm_base_pa = from->iopm_base_pa; |
| dst->msrpm_base_pa = from->msrpm_base_pa; |
| dst->tsc_offset = from->tsc_offset; |
| dst->asid = from->asid; |
| dst->tlb_ctl = from->tlb_ctl; |
| dst->int_ctl = from->int_ctl; |
| dst->int_vector = from->int_vector; |
| dst->int_state = from->int_state; |
| dst->exit_code = from->exit_code; |
| dst->exit_code_hi = from->exit_code_hi; |
| dst->exit_info_1 = from->exit_info_1; |
| dst->exit_info_2 = from->exit_info_2; |
| dst->exit_int_info = from->exit_int_info; |
| dst->exit_int_info_err = from->exit_int_info_err; |
| dst->nested_ctl = from->nested_ctl; |
| dst->event_inj = from->event_inj; |
| dst->event_inj_err = from->event_inj_err; |
| dst->nested_cr3 = from->nested_cr3; |
| dst->lbr_ctl = from->lbr_ctl; |
| } |
| |
| static int nested_svm_vmexit(struct vcpu_svm *svm) |
| { |
| struct vmcb *nested_vmcb; |
| struct vmcb *hsave = svm->nested.hsave; |
| struct vmcb *vmcb = svm->vmcb; |
| struct page *page; |
| |
| trace_kvm_nested_vmexit_inject(vmcb->control.exit_code, |
| vmcb->control.exit_info_1, |
| vmcb->control.exit_info_2, |
| vmcb->control.exit_int_info, |
| vmcb->control.exit_int_info_err, |
| KVM_ISA_SVM); |
| |
| nested_vmcb = nested_svm_map(svm, svm->nested.vmcb, &page); |
| if (!nested_vmcb) |
| return 1; |
| |
| /* Exit Guest-Mode */ |
| leave_guest_mode(&svm->vcpu); |
| svm->nested.vmcb = 0; |
| |
| /* Give the current vmcb to the guest */ |
| disable_gif(svm); |
| |
| nested_vmcb->save.es = vmcb->save.es; |
| nested_vmcb->save.cs = vmcb->save.cs; |
| nested_vmcb->save.ss = vmcb->save.ss; |
| nested_vmcb->save.ds = vmcb->save.ds; |
| nested_vmcb->save.gdtr = vmcb->save.gdtr; |
| nested_vmcb->save.idtr = vmcb->save.idtr; |
| nested_vmcb->save.efer = svm->vcpu.arch.efer; |
| nested_vmcb->save.cr0 = kvm_read_cr0(&svm->vcpu); |
| nested_vmcb->save.cr3 = kvm_read_cr3(&svm->vcpu); |
| nested_vmcb->save.cr2 = vmcb->save.cr2; |
| nested_vmcb->save.cr4 = svm->vcpu.arch.cr4; |
| nested_vmcb->save.rflags = kvm_get_rflags(&svm->vcpu); |
| nested_vmcb->save.rip = vmcb->save.rip; |
| nested_vmcb->save.rsp = vmcb->save.rsp; |
| nested_vmcb->save.rax = vmcb->save.rax; |
| nested_vmcb->save.dr7 = vmcb->save.dr7; |
| nested_vmcb->save.dr6 = vmcb->save.dr6; |
| nested_vmcb->save.cpl = vmcb->save.cpl; |
| |
| nested_vmcb->control.int_ctl = vmcb->control.int_ctl; |
| nested_vmcb->control.int_vector = vmcb->control.int_vector; |
| nested_vmcb->control.int_state = vmcb->control.int_state; |
| nested_vmcb->control.exit_code = vmcb->control.exit_code; |
| nested_vmcb->control.exit_code_hi = vmcb->control.exit_code_hi; |
| nested_vmcb->control.exit_info_1 = vmcb->control.exit_info_1; |
| nested_vmcb->control.exit_info_2 = vmcb->control.exit_info_2; |
| nested_vmcb->control.exit_int_info = vmcb->control.exit_int_info; |
| nested_vmcb->control.exit_int_info_err = vmcb->control.exit_int_info_err; |
| nested_vmcb->control.next_rip = vmcb->control.next_rip; |
| |
| /* |
| * If we emulate a VMRUN/#VMEXIT in the same host #vmexit cycle we have |
| * to make sure that we do not lose injected events. So check event_inj |
| * here and copy it to exit_int_info if it is valid. |
| * Exit_int_info and event_inj can't be both valid because the case |
| * below only happens on a VMRUN instruction intercept which has |
| * no valid exit_int_info set. |
| */ |
| if (vmcb->control.event_inj & SVM_EVTINJ_VALID) { |
| struct vmcb_control_area *nc = &nested_vmcb->control; |
| |
| nc->exit_int_info = vmcb->control.event_inj; |
| nc->exit_int_info_err = vmcb->control.event_inj_err; |
| } |
| |
| nested_vmcb->control.tlb_ctl = 0; |
| nested_vmcb->control.event_inj = 0; |
| nested_vmcb->control.event_inj_err = 0; |
| |
| /* We always set V_INTR_MASKING and remember the old value in hflags */ |
| if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK)) |
| nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK; |
| |
| /* Restore the original control entries */ |
| copy_vmcb_control_area(vmcb, hsave); |
| |
| kvm_clear_exception_queue(&svm->vcpu); |
| kvm_clear_interrupt_queue(&svm->vcpu); |
| |
| svm->nested.nested_cr3 = 0; |
| |
| /* Restore selected save entries */ |
| svm->vmcb->save.es = hsave->save.es; |
| svm->vmcb->save.cs = hsave->save.cs; |
| svm->vmcb->save.ss = hsave->save.ss; |
| svm->vmcb->save.ds = hsave->save.ds; |
| svm->vmcb->save.gdtr = hsave->save.gdtr; |
| svm->vmcb->save.idtr = hsave->save.idtr; |
| kvm_set_rflags(&svm->vcpu, hsave->save.rflags); |
| svm_set_efer(&svm->vcpu, hsave->save.efer); |
| svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE); |
| svm_set_cr4(&svm->vcpu, hsave->save.cr4); |
| if (npt_enabled) { |
| svm->vmcb->save.cr3 = hsave->save.cr3; |
| svm->vcpu.arch.cr3 = hsave->save.cr3; |
| } else { |
| (void)kvm_set_cr3(&svm->vcpu, hsave->save.cr3); |
| } |
| kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, hsave->save.rax); |
| kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, hsave->save.rsp); |
| kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, hsave->save.rip); |
| svm->vmcb->save.dr7 = 0; |
| svm->vmcb->save.cpl = 0; |
| svm->vmcb->control.exit_int_info = 0; |
| |
| mark_all_dirty(svm->vmcb); |
| |
| nested_svm_unmap(page); |
| |
| nested_svm_uninit_mmu_context(&svm->vcpu); |
| kvm_mmu_reset_context(&svm->vcpu); |
| kvm_mmu_load(&svm->vcpu); |
| |
| return 0; |
| } |
| |
| static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm) |
| { |
| /* |
| * This function merges the msr permission bitmaps of kvm and the |
| * nested vmcb. It is omptimized in that it only merges the parts where |
| * the kvm msr permission bitmap may contain zero bits |
| */ |
| int i; |
| |
| if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT))) |
| return true; |
| |
| for (i = 0; i < MSRPM_OFFSETS; i++) { |
| u32 value, p; |
| u64 offset; |
| |
| if (msrpm_offsets[i] == 0xffffffff) |
| break; |
| |
| p = msrpm_offsets[i]; |
| offset = svm->nested.vmcb_msrpm + (p * 4); |
| |
| if (kvm_read_guest(svm->vcpu.kvm, offset, &value, 4)) |
| return false; |
| |
| svm->nested.msrpm[p] = svm->msrpm[p] | value; |
| } |
| |
| svm->vmcb->control.msrpm_base_pa = __pa(svm->nested.msrpm); |
| |
| return true; |
| } |
| |
| static bool nested_vmcb_checks(struct vmcb *vmcb) |
| { |
| if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0) |
| return false; |
| |
| if (vmcb->control.asid == 0) |
| return false; |
| |
| if (vmcb->control.nested_ctl && !npt_enabled) |
| return false; |
| |
| return true; |
| } |
| |
| static bool nested_svm_vmrun(struct vcpu_svm *svm) |
| { |
| struct vmcb *nested_vmcb; |
| struct vmcb *hsave = svm->nested.hsave; |
| struct vmcb *vmcb = svm->vmcb; |
| struct page *page; |
| u64 vmcb_gpa; |
| |
| vmcb_gpa = svm->vmcb->save.rax; |
| |
| nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page); |
| if (!nested_vmcb) |
| return false; |
| |
| if (!nested_vmcb_checks(nested_vmcb)) { |
| nested_vmcb->control.exit_code = SVM_EXIT_ERR; |
| nested_vmcb->control.exit_code_hi = 0; |
| nested_vmcb->control.exit_info_1 = 0; |
| nested_vmcb->control.exit_info_2 = 0; |
| |
| nested_svm_unmap(page); |
| |
| return false; |
| } |
| |
| trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa, |
| nested_vmcb->save.rip, |
| nested_vmcb->control.int_ctl, |
| nested_vmcb->control.event_inj, |
| nested_vmcb->control.nested_ctl); |
| |
| trace_kvm_nested_intercepts(nested_vmcb->control.intercept_cr & 0xffff, |
| nested_vmcb->control.intercept_cr >> 16, |
| nested_vmcb->control.intercept_exceptions, |
| nested_vmcb->control.intercept); |
| |
| /* Clear internal status */ |
| kvm_clear_exception_queue(&svm->vcpu); |
| kvm_clear_interrupt_queue(&svm->vcpu); |
| |
| /* |
| * Save the old vmcb, so we don't need to pick what we save, but can |
| * restore everything when a VMEXIT occurs |
| */ |
| hsave->save.es = vmcb->save.es; |
| hsave->save.cs = vmcb->save.cs; |
| hsave->save.ss = vmcb->save.ss; |
| hsave->save.ds = vmcb->save.ds; |
| hsave->save.gdtr = vmcb->save.gdtr; |
| hsave->save.idtr = vmcb->save.idtr; |
| hsave->save.efer = svm->vcpu.arch.efer; |
| hsave->save.cr0 = kvm_read_cr0(&svm->vcpu); |
| hsave->save.cr4 = svm->vcpu.arch.cr4; |
| hsave->save.rflags = kvm_get_rflags(&svm->vcpu); |
| hsave->save.rip = kvm_rip_read(&svm->vcpu); |
| hsave->save.rsp = vmcb->save.rsp; |
| hsave->save.rax = vmcb->save.rax; |
| if (npt_enabled) |
| hsave->save.cr3 = vmcb->save.cr3; |
| else |
| hsave->save.cr3 = kvm_read_cr3(&svm->vcpu); |
| |
| copy_vmcb_control_area(hsave, vmcb); |
| |
| if (kvm_get_rflags(&svm->vcpu) & X86_EFLAGS_IF) |
| svm->vcpu.arch.hflags |= HF_HIF_MASK; |
| else |
| svm->vcpu.arch.hflags &= ~HF_HIF_MASK; |
| |
| if (nested_vmcb->control.nested_ctl) { |
| kvm_mmu_unload(&svm->vcpu); |
| svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3; |
| nested_svm_init_mmu_context(&svm->vcpu); |
| } |
| |
| /* Load the nested guest state */ |
| svm->vmcb->save.es = nested_vmcb->save.es; |
| svm->vmcb->save.cs = nested_vmcb->save.cs; |
| svm->vmcb->save.ss = nested_vmcb->save.ss; |
| svm->vmcb->save.ds = nested_vmcb->save.ds; |
| svm->vmcb->save.gdtr = nested_vmcb->save.gdtr; |
| svm->vmcb->save.idtr = nested_vmcb->save.idtr; |
| kvm_set_rflags(&svm->vcpu, nested_vmcb->save.rflags); |
| svm_set_efer(&svm->vcpu, nested_vmcb->save.efer); |
| svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0); |
| svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4); |
| if (npt_enabled) { |
| svm->vmcb->save.cr3 = nested_vmcb->save.cr3; |
| svm->vcpu.arch.cr3 = nested_vmcb->save.cr3; |
| } else |
| (void)kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3); |
| |
| /* Guest paging mode is active - reset mmu */ |
| kvm_mmu_reset_context(&svm->vcpu); |
| |
| svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2; |
| kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, nested_vmcb->save.rax); |
| kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, nested_vmcb->save.rsp); |
| kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, nested_vmcb->save.rip); |
| |
| /* In case we don't even reach vcpu_run, the fields are not updated */ |
| svm->vmcb->save.rax = nested_vmcb->save.rax; |
| svm->vmcb->save.rsp = nested_vmcb->save.rsp; |
| svm->vmcb->save.rip = nested_vmcb->save.rip; |
| svm->vmcb->save.dr7 = nested_vmcb->save.dr7; |
| svm->vmcb->save.dr6 = nested_vmcb->save.dr6; |
| svm->vmcb->save.cpl = nested_vmcb->save.cpl; |
| |
| svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL; |
| svm->nested.vmcb_iopm = nested_vmcb->control.iopm_base_pa & ~0x0fffULL; |
| |
| /* cache intercepts */ |
| svm->nested.intercept_cr = nested_vmcb->control.intercept_cr; |
| svm->nested.intercept_dr = nested_vmcb->control.intercept_dr; |
| svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions; |
| svm->nested.intercept = nested_vmcb->control.intercept; |
| |
| svm_flush_tlb(&svm->vcpu); |
| svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK; |
| if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK) |
| svm->vcpu.arch.hflags |= HF_VINTR_MASK; |
| else |
| svm->vcpu.arch.hflags &= ~HF_VINTR_MASK; |
| |
| if (svm->vcpu.arch.hflags & HF_VINTR_MASK) { |
| /* We only want the cr8 intercept bits of the guest */ |
| clr_cr_intercept(svm, INTERCEPT_CR8_READ); |
| clr_cr_intercept(svm, INTERCEPT_CR8_WRITE); |
| } |
| |
| /* We don't want to see VMMCALLs from a nested guest */ |
| clr_intercept(svm, INTERCEPT_VMMCALL); |
| |
| svm->vmcb->control.lbr_ctl = nested_vmcb->control.lbr_ctl; |
| svm->vmcb->control.int_vector = nested_vmcb->control.int_vector; |
| svm->vmcb->control.int_state = nested_vmcb->control.int_state; |
| svm->vmcb->control.tsc_offset += nested_vmcb->control.tsc_offset; |
| svm->vmcb->control.event_inj = nested_vmcb->control.event_inj; |
| svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err; |
| |
| nested_svm_unmap(page); |
| |
| /* Enter Guest-Mode */ |
| enter_guest_mode(&svm->vcpu); |
| |
| /* |
| * Merge guest and host intercepts - must be called with vcpu in |
| * guest-mode to take affect here |
| */ |
| recalc_intercepts(svm); |
| |
| svm->nested.vmcb = vmcb_gpa; |
| |
| enable_gif(svm); |
| |
| mark_all_dirty(svm->vmcb); |
| |
| return true; |
| } |
| |
| static void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb) |
| { |
| to_vmcb->save.fs = from_vmcb->save.fs; |
| to_vmcb->save.gs = from_vmcb->save.gs; |
| to_vmcb->save.tr = from_vmcb->save.tr; |
| to_vmcb->save.ldtr = from_vmcb->save.ldtr; |
| to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base; |
| to_vmcb->save.star = from_vmcb->save.star; |
| to_vmcb->save.lstar = from_vmcb->save.lstar; |
| to_vmcb->save.cstar = from_vmcb->save.cstar; |
| to_vmcb->save.sfmask = from_vmcb->save.sfmask; |
| to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs; |
| to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp; |
| to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip; |
| } |
| |
| static int vmload_interception(struct vcpu_svm *svm) |
| { |
| struct vmcb *nested_vmcb; |
| struct page *page; |
| |
| if (nested_svm_check_permissions(svm)) |
| return 1; |
| |
| nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page); |
| if (!nested_vmcb) |
| return 1; |
| |
| svm->next_rip = kvm_rip_read(&svm->vcpu) + 3; |
| skip_emulated_instruction(&svm->vcpu); |
| |
| nested_svm_vmloadsave(nested_vmcb, svm->vmcb); |
| nested_svm_unmap(page); |
| |
| return 1; |
| } |
| |
| static int vmsave_interception(struct vcpu_svm *svm) |
| { |
| struct vmcb *nested_vmcb; |
| struct page *page; |
| |
| if (nested_svm_check_permissions(svm)) |
| return 1; |
| |
| nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page); |
| if (!nested_vmcb) |
| return 1; |
| |
| svm->next_rip = kvm_rip_read(&svm->vcpu) + 3; |
| skip_emulated_instruction(&svm->vcpu); |
| |
| nested_svm_vmloadsave(svm->vmcb, nested_vmcb); |
| nested_svm_unmap(page); |
| |
| return 1; |
| } |
| |
| static int vmrun_interception(struct vcpu_svm *svm) |
| { |
| if (nested_svm_check_permissions(svm)) |
| return 1; |
| |
| /* Save rip after vmrun instruction */ |
| kvm_rip_write(&svm->vcpu, kvm_rip_read(&svm->vcpu) + 3); |
| |
| if (!nested_svm_vmrun(svm)) |
| return 1; |
| |
| if (!nested_svm_vmrun_msrpm(svm)) |
| goto failed; |
| |
| return 1; |
| |
| failed: |
| |
| svm->vmcb->control.exit_code = SVM_EXIT_ERR; |
| svm->vmcb->control.exit_code_hi = 0; |
| svm->vmcb->control.exit_info_1 = 0; |
| svm->vmcb->control.exit_info_2 = 0; |
| |
| nested_svm_vmexit(svm); |
| |
| return 1; |
| } |
| |
| static int stgi_interception(struct vcpu_svm *svm) |
| { |
| if (nested_svm_check_permissions(svm)) |
| return 1; |
| |
| svm->next_rip = kvm_rip_read(&svm->vcpu) + 3; |
| skip_emulated_instruction(&svm->vcpu); |
| kvm_make_request(KVM_REQ_EVENT, &svm->vcpu); |
| |
| enable_gif(svm); |
| |
| return 1; |
| } |
| |
| static int clgi_interception(struct vcpu_svm *svm) |
| { |
| if (nested_svm_check_permissions(svm)) |
| return 1; |
| |
| svm->next_rip = kvm_rip_read(&svm->vcpu) + 3; |
| skip_emulated_instruction(&svm->vcpu); |
| |
| disable_gif(svm); |
| |
| /* After a CLGI no interrupts should come */ |
| svm_clear_vintr(svm); |
| svm->vmcb->control.int_ctl &= ~V_IRQ_MASK; |
| |
| mark_dirty(svm->vmcb, VMCB_INTR); |
| |
| return 1; |
| } |
| |
| static int invlpga_interception(struct vcpu_svm *svm) |
| { |
| struct kvm_vcpu *vcpu = &svm->vcpu; |
| |
| trace_kvm_invlpga(svm->vmcb->save.rip, vcpu->arch.regs[VCPU_REGS_RCX], |
| vcpu->arch.regs[VCPU_REGS_RAX]); |
| |
| /* Let's treat INVLPGA the same as INVLPG (can be optimized!) */ |
| kvm_mmu_invlpg(vcpu, vcpu->arch.regs[VCPU_REGS_RAX]); |
| |
| svm->next_rip = kvm_rip_read(&svm->vcpu) + 3; |
| skip_emulated_instruction(&svm->vcpu); |
| return 1; |
| } |
| |
| static int skinit_interception(struct vcpu_svm *svm) |
| { |
| trace_kvm_skinit(svm->vmcb->save.rip, svm->vcpu.arch.regs[VCPU_REGS_RAX]); |
| |
| kvm_queue_exception(&svm->vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| static int xsetbv_interception(struct vcpu_svm *svm) |
| { |
| u64 new_bv = kvm_read_edx_eax(&svm->vcpu); |
| u32 index = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX); |
| |
| if (kvm_set_xcr(&svm->vcpu, index, new_bv) == 0) { |
| svm->next_rip = kvm_rip_read(&svm->vcpu) + 3; |
| skip_emulated_instruction(&svm->vcpu); |
| } |
| |
| return 1; |
| } |
| |
| static int invalid_op_interception(struct vcpu_svm *svm) |
| { |
| kvm_queue_exception(&svm->vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| static int task_switch_interception(struct vcpu_svm *svm) |
| { |
| u16 tss_selector; |
| int reason; |
| int int_type = svm->vmcb->control.exit_int_info & |
| SVM_EXITINTINFO_TYPE_MASK; |
| int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK; |
| uint32_t type = |
| svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK; |
| uint32_t idt_v = |
| svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID; |
| bool has_error_code = false; |
| u32 error_code = 0; |
| |
| tss_selector = (u16)svm->vmcb->control.exit_info_1; |
| |
| if (svm->vmcb->control.exit_info_2 & |
| (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET)) |
| reason = TASK_SWITCH_IRET; |
| else if (svm->vmcb->control.exit_info_2 & |
| (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP)) |
| reason = TASK_SWITCH_JMP; |
| else if (idt_v) |
| reason = TASK_SWITCH_GATE; |
| else |
| reason = TASK_SWITCH_CALL; |
| |
| if (reason == TASK_SWITCH_GATE) { |
| switch (type) { |
| case SVM_EXITINTINFO_TYPE_NMI: |
| svm->vcpu.arch.nmi_injected = false; |
| break; |
| case SVM_EXITINTINFO_TYPE_EXEPT: |
| if (svm->vmcb->control.exit_info_2 & |
| (1ULL << SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE)) { |
| has_error_code = true; |
| error_code = |
| (u32)svm->vmcb->control.exit_info_2; |
| } |
| kvm_clear_exception_queue(&svm->vcpu); |
| break; |
| case SVM_EXITINTINFO_TYPE_INTR: |
| kvm_clear_interrupt_queue(&svm->vcpu); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| if (reason != TASK_SWITCH_GATE || |
| int_type == SVM_EXITINTINFO_TYPE_SOFT || |
| (int_type == SVM_EXITINTINFO_TYPE_EXEPT && |
| (int_vec == OF_VECTOR || int_vec == BP_VECTOR))) |
| skip_emulated_instruction(&svm->vcpu); |
| |
| if (kvm_task_switch(&svm->vcpu, tss_selector, reason, |
| has_error_code, error_code) == EMULATE_FAIL) { |
| svm->vcpu.run->exit_reason = KVM_EXIT_INTERNAL_ERROR; |
| svm->vcpu.run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; |
| svm->vcpu.run->internal.ndata = 0; |
| return 0; |
| } |
| return 1; |
| } |
| |
| static int cpuid_interception(struct vcpu_svm *svm) |
| { |
| svm->next_rip = kvm_rip_read(&svm->vcpu) + 2; |
| kvm_emulate_cpuid(&svm->vcpu); |
| return 1; |
| } |
| |
| static int iret_interception(struct vcpu_svm *svm) |
| { |
| ++svm->vcpu.stat.nmi_window_exits; |
| clr_intercept(svm, INTERCEPT_IRET); |
| svm->vcpu.arch.hflags |= HF_IRET_MASK; |
| svm->nmi_iret_rip = kvm_rip_read(&svm->vcpu); |
| return 1; |
| } |
| |
| static int invlpg_interception(struct vcpu_svm *svm) |
| { |
| if (!static_cpu_has(X86_FEATURE_DECODEASSISTS)) |
| return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE; |
| |
| kvm_mmu_invlpg(&svm->vcpu, svm->vmcb->control.exit_info_1); |
| skip_emulated_instruction(&svm->vcpu); |
| return 1; |
| } |
| |
| static int emulate_on_interception(struct vcpu_svm *svm) |
| { |
| return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE; |
| } |
| |
| bool check_selective_cr0_intercepted(struct vcpu_svm *svm, unsigned long val) |
| { |
| unsigned long cr0 = svm->vcpu.arch.cr0; |
| bool ret = false; |
| u64 intercept; |
| |
| intercept = svm->nested.intercept; |
| |
| if (!is_guest_mode(&svm->vcpu) || |
| (!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0)))) |
| return false; |
| |
| cr0 &= ~SVM_CR0_SELECTIVE_MASK; |
| val &= ~SVM_CR0_SELECTIVE_MASK; |
| |
| if (cr0 ^ val) { |
| svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE; |
| ret = (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE); |
| } |
| |
| return ret; |
| } |
| |
| #define CR_VALID (1ULL << 63) |
| |
| static int cr_interception(struct vcpu_svm *svm) |
| { |
| int reg, cr; |
| unsigned long val; |
| int err; |
| |
| if (!static_cpu_has(X86_FEATURE_DECODEASSISTS)) |
| return emulate_on_interception(svm); |
| |
| if (unlikely((svm->vmcb->control.exit_info_1 & CR_VALID) == 0)) |
| return emulate_on_interception(svm); |
| |
| reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK; |
| cr = svm->vmcb->control.exit_code - SVM_EXIT_READ_CR0; |
| |
| err = 0; |
| if (cr >= 16) { /* mov to cr */ |
| cr -= 16; |
| val = kvm_register_read(&svm->vcpu, reg); |
| switch (cr) { |
| case 0: |
| if (!check_selective_cr0_intercepted(svm, val)) |
| err = kvm_set_cr0(&svm->vcpu, val); |
| else |
| return 1; |
| |
| break; |
| case 3: |
| err = kvm_set_cr3(&svm->vcpu, val); |
| break; |
| case 4: |
| err = kvm_set_cr4(&svm->vcpu, val); |
| break; |
| case 8: |
| err = kvm_set_cr8(&svm->vcpu, val); |
| break; |
| default: |
| WARN(1, "unhandled write to CR%d", cr); |
| kvm_queue_exception(&svm->vcpu, UD_VECTOR); |
| return 1; |
| } |
| } else { /* mov from cr */ |
| switch (cr) { |
| case 0: |
| val = kvm_read_cr0(&svm->vcpu); |
| break; |
| case 2: |
| val = svm->vcpu.arch.cr2; |
| break; |
| case 3: |
| val = kvm_read_cr3(&svm->vcpu); |
| break; |
| case 4: |
| val = kvm_read_cr4(&svm->vcpu); |
| break; |
| case 8: |
| val = kvm_get_cr8(&svm->vcpu); |
| break; |
| default: |
| WARN(1, "unhandled read from CR%d", cr); |
| kvm_queue_exception(&svm->vcpu, UD_VECTOR); |
| return 1; |
| } |
| kvm_register_write(&svm->vcpu, reg, val); |
| } |
| kvm_complete_insn_gp(&svm->vcpu, err); |
| |
| return 1; |
| } |
| |
| static int dr_interception(struct vcpu_svm *svm) |
| { |
| int reg, dr; |
| unsigned long val; |
| int err; |
| |
| if (!boot_cpu_has(X86_FEATURE_DECODEASSISTS)) |
| return emulate_on_interception(svm); |
| |
| reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK; |
| dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0; |
| |
| if (dr >= 16) { /* mov to DRn */ |
| val = kvm_register_read(&svm->vcpu, reg); |
| kvm_set_dr(&svm->vcpu, dr - 16, val); |
| } else { |
| err = kvm_get_dr(&svm->vcpu, dr, &val); |
| if (!err) |
| kvm_register_write(&svm->vcpu, reg, val); |
| } |
| |
| skip_emulated_instruction(&svm->vcpu); |
| |
| return 1; |
| } |
| |
| static int cr8_write_interception(struct vcpu_svm *svm) |
| { |
| struct kvm_run *kvm_run = svm->vcpu.run; |
| int r; |
| |
| u8 cr8_prev = kvm_get_cr8(&svm->vcpu); |
| /* instruction emulation calls kvm_set_cr8() */ |
| r = cr_interception(svm); |
| if (irqchip_in_kernel(svm->vcpu.kvm)) { |
| clr_cr_intercept(svm, INTERCEPT_CR8_WRITE); |
| return r; |
| } |
| if (cr8_prev <= kvm_get_cr8(&svm->vcpu)) |
| return r; |
| kvm_run->exit_reason = KVM_EXIT_SET_TPR; |
| return 0; |
| } |
| |
| u64 svm_read_l1_tsc(struct kvm_vcpu *vcpu) |
| { |
| struct vmcb *vmcb = get_host_vmcb(to_svm(vcpu)); |
| return vmcb->control.tsc_offset + |
| svm_scale_tsc(vcpu, native_read_tsc()); |
| } |
| |
| static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| switch (ecx) { |
| case MSR_IA32_TSC: { |
| *data = svm->vmcb->control.tsc_offset + |
| svm_scale_tsc(vcpu, native_read_tsc()); |
| |
| break; |
| } |
| case MSR_STAR: |
| *data = svm->vmcb->save.star; |
| break; |
| #ifdef CONFIG_X86_64 |
| case MSR_LSTAR: |
| *data = svm->vmcb->save.lstar; |
| break; |
| case MSR_CSTAR: |
| *data = svm->vmcb->save.cstar; |
| break; |
| case MSR_KERNEL_GS_BASE: |
| *data = svm->vmcb->save.kernel_gs_base; |
| break; |
| case MSR_SYSCALL_MASK: |
| *data = svm->vmcb->save.sfmask; |
| break; |
| #endif |
| case MSR_IA32_SYSENTER_CS: |
| *data = svm->vmcb->save.sysenter_cs; |
| break; |
| case MSR_IA32_SYSENTER_EIP: |
| *data = svm->sysenter_eip; |
| break; |
| case MSR_IA32_SYSENTER_ESP: |
| *data = svm->sysenter_esp; |
| break; |
| /* |
| * Nobody will change the following 5 values in the VMCB so we can |
| * safely return them on rdmsr. They will always be 0 until LBRV is |
| * implemented. |
| */ |
| case MSR_IA32_DEBUGCTLMSR: |
| *data = svm->vmcb->save.dbgctl; |
| break; |
| case MSR_IA32_LASTBRANCHFROMIP: |
| *data = svm->vmcb->save.br_from; |
| break; |
| case MSR_IA32_LASTBRANCHTOIP: |
| *data = svm->vmcb->save.br_to; |
| break; |
| case MSR_IA32_LASTINTFROMIP: |
| *data = svm->vmcb->save.last_excp_from; |
| break; |
| case MSR_IA32_LASTINTTOIP: |
| *data = svm->vmcb->save.last_excp_to; |
| break; |
| case MSR_VM_HSAVE_PA: |
| *data = svm->nested.hsave_msr; |
| break; |
| case MSR_VM_CR: |
| *data = svm->nested.vm_cr_msr; |
| break; |
| case MSR_IA32_UCODE_REV: |
| *data = 0x01000065; |
| break; |
| default: |
| return kvm_get_msr_common(vcpu, ecx, data); |
| } |
| return 0; |
| } |
| |
| static int rdmsr_interception(struct vcpu_svm *svm) |
| { |
| u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX]; |
| u64 data; |
| |
| if (svm_get_msr(&svm->vcpu, ecx, &data)) { |
| trace_kvm_msr_read_ex(ecx); |
| kvm_inject_gp(&svm->vcpu, 0); |
| } else { |
| trace_kvm_msr_read(ecx, data); |
| |
| svm->vcpu.arch.regs[VCPU_REGS_RAX] = data & 0xffffffff; |
| svm->vcpu.arch |