/* * 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 * Yaniv Kamay * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #include "irq.h" #include "mmu.h" #include #include #include #include #include #include #include #include #include "kvm_cache_regs.h" #include "x86.h" #include #include #include #include #include #include "trace.h" #define __ex(x) __kvm_handle_fault_on_reboot(x) MODULE_AUTHOR("Qumranet"); MODULE_LICENSE("GPL"); static int __read_mostly bypass_guest_pf = 1; module_param(bypass_guest_pf, bool, S_IRUGO); static int __read_mostly enable_vpid = 1; module_param_named(vpid, enable_vpid, bool, 0444); static int __read_mostly flexpriority_enabled = 1; module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO); static int __read_mostly enable_ept = 1; module_param_named(ept, enable_ept, bool, S_IRUGO); static int __read_mostly enable_unrestricted_guest = 1; module_param_named(unrestricted_guest, enable_unrestricted_guest, bool, S_IRUGO); static int __read_mostly emulate_invalid_guest_state = 0; module_param(emulate_invalid_guest_state, bool, S_IRUGO); #define KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST \ (X86_CR0_WP | X86_CR0_NE | X86_CR0_NW | X86_CR0_CD) #define KVM_GUEST_CR0_MASK \ (KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE) #define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST \ (X86_CR0_WP | X86_CR0_NE | X86_CR0_TS | X86_CR0_MP) #define KVM_VM_CR0_ALWAYS_ON \ (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE) #define KVM_CR4_GUEST_OWNED_BITS \ (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \ | X86_CR4_OSXMMEXCPT) #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE) #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE) /* * These 2 parameters are used to config the controls for Pause-Loop Exiting: * ple_gap: upper bound on the amount of time between two successive * executions of PAUSE in a loop. Also indicate if ple enabled. * According to test, this time is usually small than 41 cycles. * ple_window: upper bound on the amount of time a guest is allowed to execute * in a PAUSE loop. Tests indicate that most spinlocks are held for * less than 2^12 cycles * Time is measured based on a counter that runs at the same rate as the TSC, * refer SDM volume 3b section 21.6.13 & 22.1.3. */ #define KVM_VMX_DEFAULT_PLE_GAP 41 #define KVM_VMX_DEFAULT_PLE_WINDOW 4096 static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP; module_param(ple_gap, int, S_IRUGO); static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW; module_param(ple_window, int, S_IRUGO); struct vmcs { u32 revision_id; u32 abort; char data[0]; }; struct shared_msr_entry { unsigned index; u64 data; u64 mask; }; struct vcpu_vmx { struct kvm_vcpu vcpu; struct list_head local_vcpus_link; unsigned long host_rsp; int launched; u8 fail; u32 idt_vectoring_info; struct shared_msr_entry *guest_msrs; int nmsrs; int save_nmsrs; #ifdef CONFIG_X86_64 u64 msr_host_kernel_gs_base; u64 msr_guest_kernel_gs_base; #endif struct vmcs *vmcs; struct { int loaded; u16 fs_sel, gs_sel, ldt_sel; int gs_ldt_reload_needed; int fs_reload_needed; } host_state; struct { int vm86_active; u8 save_iopl; struct kvm_save_segment { u16 selector; unsigned long base; u32 limit; u32 ar; } tr, es, ds, fs, gs; struct { bool pending; u8 vector; unsigned rip; } irq; } rmode; int vpid; bool emulation_required; /* Support for vnmi-less CPUs */ int soft_vnmi_blocked; ktime_t entry_time; s64 vnmi_blocked_time; u32 exit_reason; bool rdtscp_enabled; }; static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu) { return container_of(vcpu, struct vcpu_vmx, vcpu); } static int init_rmode(struct kvm *kvm); static u64 construct_eptp(unsigned long root_hpa); static DEFINE_PER_CPU(struct vmcs *, vmxarea); static DEFINE_PER_CPU(struct vmcs *, current_vmcs); static DEFINE_PER_CPU(struct list_head, vcpus_on_cpu); static unsigned long *vmx_io_bitmap_a; static unsigned long *vmx_io_bitmap_b; static unsigned long *vmx_msr_bitmap_legacy; static unsigned long *vmx_msr_bitmap_longmode; static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS); static DEFINE_SPINLOCK(vmx_vpid_lock); static struct vmcs_config { int size; int order; u32 revision_id; u32 pin_based_exec_ctrl; u32 cpu_based_exec_ctrl; u32 cpu_based_2nd_exec_ctrl; u32 vmexit_ctrl; u32 vmentry_ctrl; } vmcs_config; static struct vmx_capability { u32 ept; u32 vpid; } vmx_capability; #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 u64 host_efer; static void ept_save_pdptrs(struct kvm_vcpu *vcpu); /* * Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it * away by decrementing the array size. */ static const u32 vmx_msr_index[] = { #ifdef CONFIG_X86_64 MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, #endif MSR_EFER, MSR_TSC_AUX, 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_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK); } static inline int is_no_device(u32 intr_info) { return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | INTR_INFO_VALID_MASK)) == (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK); } static inline int is_invalid_opcode(u32 intr_info) { return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | INTR_INFO_VALID_MASK)) == (INTR_TYPE_HARD_EXCEPTION | UD_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 inline int is_machine_check(u32 intr_info) { return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | INTR_INFO_VALID_MASK)) == (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK); } static inline int cpu_has_vmx_msr_bitmap(void) { return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS; } static inline int cpu_has_vmx_tpr_shadow(void) { return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW; } static inline int vm_need_tpr_shadow(struct kvm *kvm) { return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm)); } static inline int cpu_has_secondary_exec_ctrls(void) { return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; } static inline bool cpu_has_vmx_virtualize_apic_accesses(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; } static inline bool cpu_has_vmx_flexpriority(void) { return cpu_has_vmx_tpr_shadow() && cpu_has_vmx_virtualize_apic_accesses(); } static inline bool cpu_has_vmx_ept_execute_only(void) { return !!(vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT); } static inline bool cpu_has_vmx_eptp_uncacheable(void) { return !!(vmx_capability.ept & VMX_EPTP_UC_BIT); } static inline bool cpu_has_vmx_eptp_writeback(void) { return !!(vmx_capability.ept & VMX_EPTP_WB_BIT); } static inline bool cpu_has_vmx_ept_2m_page(void) { return !!(vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT); } static inline bool cpu_has_vmx_ept_1g_page(void) { return !!(vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT); } static inline int cpu_has_vmx_invept_individual_addr(void) { return !!(vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT); } static inline int cpu_has_vmx_invept_context(void) { return !!(vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT); } static inline int cpu_has_vmx_invept_global(void) { return !!(vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT); } static inline int cpu_has_vmx_ept(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_EPT; } static inline int cpu_has_vmx_unrestricted_guest(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_UNRESTRICTED_GUEST; } static inline int cpu_has_vmx_ple(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_PAUSE_LOOP_EXITING; } static inline int vm_need_virtualize_apic_accesses(struct kvm *kvm) { return flexpriority_enabled && (cpu_has_vmx_virtualize_apic_accesses()) && (irqchip_in_kernel(kvm)); } static inline int cpu_has_vmx_vpid(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_VPID; } static inline int cpu_has_vmx_rdtscp(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_RDTSCP; } static inline int cpu_has_virtual_nmis(void) { return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS; } static inline bool report_flexpriority(void) { return flexpriority_enabled; } static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr) { int i; for (i = 0; i < vmx->nmsrs; ++i) if (vmx_msr_index[vmx->guest_msrs[i].index] == msr) return i; return -1; } static inline void __invvpid(int ext, u16 vpid, gva_t gva) { struct { u64 vpid : 16; u64 rsvd : 48; u64 gva; } operand = { vpid, 0, gva }; asm volatile (__ex(ASM_VMX_INVVPID) /* CF==1 or ZF==1 --> rc = -1 */ "; ja 1f ; ud2 ; 1:" : : "a"(&operand), "c"(ext) : "cc", "memory"); } static inline void __invept(int ext, u64 eptp, gpa_t gpa) { struct { u64 eptp, gpa; } operand = {eptp, gpa}; asm volatile (__ex(ASM_VMX_INVEPT) /* CF==1 or ZF==1 --> rc = -1 */ "; ja 1f ; ud2 ; 1:\n" : : "a" (&operand), "c" (ext) : "cc", "memory"); } static struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr) { int i; i = __find_msr_index(vmx, msr); if (i >= 0) return &vmx->guest_msrs[i]; return NULL; } static void vmcs_clear(struct vmcs *vmcs) { u64 phys_addr = __pa(vmcs); u8 error; asm volatile (__ex(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 vcpu_vmx *vmx = arg; int cpu = raw_smp_processor_id(); if (vmx->vcpu.cpu == cpu) vmcs_clear(vmx->vmcs); if (per_cpu(current_vmcs, cpu) == vmx->vmcs) per_cpu(current_vmcs, cpu) = NULL; rdtscll(vmx->vcpu.arch.host_tsc); list_del(&vmx->local_vcpus_link); vmx->vcpu.cpu = -1; vmx->launched = 0; } static void vcpu_clear(struct vcpu_vmx *vmx) { if (vmx->vcpu.cpu == -1) return; smp_call_function_single(vmx->vcpu.cpu, __vcpu_clear, vmx, 1); } static inline void vpid_sync_vcpu_all(struct vcpu_vmx *vmx) { if (vmx->vpid == 0) return; __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0); } static inline void ept_sync_global(void) { if (cpu_has_vmx_invept_global()) __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0); } static inline void ept_sync_context(u64 eptp) { if (enable_ept) { if (cpu_has_vmx_invept_context()) __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0); else ept_sync_global(); } } static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa) { if (enable_ept) { if (cpu_has_vmx_invept_individual_addr()) __invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR, eptp, gpa); else ept_sync_context(eptp); } } static unsigned long vmcs_readl(unsigned long field) { unsigned long value; asm volatile (__ex(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 (__ex(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) { vmcs_writel(field, value); #ifndef CONFIG_X86_64 asm volatile (""); vmcs_writel(field+1, value >> 32); #endif } static void vmcs_clear_bits(unsigned long field, u32 mask) { vmcs_writel(field, vmcs_readl(field) & ~mask); } static void vmcs_set_bits(unsigned long field, u32 mask) { vmcs_writel(field, vmcs_readl(field) | mask); } static void update_exception_bitmap(struct kvm_vcpu *vcpu) { u32 eb; eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR); if (!vcpu->fpu_active) eb |= 1u << NM_VECTOR; /* * Unconditionally intercept #DB so we can maintain dr6 without * reading it every exit. */ eb |= 1u << DB_VECTOR; if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) { if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) eb |= 1u << BP_VECTOR; } if (to_vmx(vcpu)->rmode.vm86_active) eb = ~0; if (enable_ept) eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */ vmcs_write32(EXCEPTION_BITMAP, eb); } static void reload_tss(void) { /* * VT restores TR but not its size. Useless. */ struct descriptor_table gdt; struct desc_struct *descs; kvm_get_gdt(&gdt); descs = (void *)gdt.base; descs[GDT_ENTRY_TSS].type = 9; /* available TSS */ load_TR_desc(); } static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset) { u64 guest_efer; u64 ignore_bits; guest_efer = vmx->vcpu.arch.shadow_efer; /* * NX is emulated; LMA and LME handled by hardware; SCE meaninless * outside long mode */ ignore_bits = EFER_NX | EFER_SCE; #ifdef CONFIG_X86_64 ignore_bits |= EFER_LMA | EFER_LME; /* SCE is meaningful only in long mode on Intel */ if (guest_efer & EFER_LMA) ignore_bits &= ~(u64)EFER_SCE; #endif guest_efer &= ~ignore_bits; guest_efer |= host_efer & ignore_bits; vmx->guest_msrs[efer_offset].data = guest_efer; vmx->guest_msrs[efer_offset].mask = ~ignore_bits; return true; } static void vmx_save_host_state(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); int i; if (vmx->host_state.loaded) return; vmx->host_state.loaded = 1; /* * Set host fs and gs selectors. Unfortunately, 22.2.3 does not * allow segment selectors with cpl > 0 or ti == 1. */ vmx->host_state.ldt_sel = kvm_read_ldt(); vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel; vmx->host_state.fs_sel = kvm_read_fs(); if (!(vmx->host_state.fs_sel & 7)) { vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel); vmx->host_state.fs_reload_needed = 0; } else { vmcs_write16(HOST_FS_SELECTOR, 0); vmx->host_state.fs_reload_needed = 1; } vmx->host_state.gs_sel = kvm_read_gs(); if (!(vmx->host_state.gs_sel & 7)) vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel); else { vmcs_write16(HOST_GS_SELECTOR, 0); vmx->host_state.gs_ldt_reload_needed = 1; } #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(vmx->host_state.fs_sel)); vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel)); #endif #ifdef CONFIG_X86_64 if (is_long_mode(&vmx->vcpu)) { rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); } #endif for (i = 0; i < vmx->save_nmsrs; ++i) kvm_set_shared_msr(vmx->guest_msrs[i].index, vmx->guest_msrs[i].data, vmx->guest_msrs[i].mask); } static void __vmx_load_host_state(struct vcpu_vmx *vmx) { unsigned long flags; if (!vmx->host_state.loaded) return; ++vmx->vcpu.stat.host_state_reload; vmx->host_state.loaded = 0; if (vmx->host_state.fs_reload_needed) kvm_load_fs(vmx->host_state.fs_sel); if (vmx->host_state.gs_ldt_reload_needed) { kvm_load_ldt(vmx->host_state.ldt_sel); /* * If we have to reload gs, we must take care to * preserve our gs base. */ local_irq_save(flags); kvm_load_gs(vmx->host_state.gs_sel); #ifdef CONFIG_X86_64 wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE)); #endif local_irq_restore(flags); } reload_tss(); #ifdef CONFIG_X86_64 if (is_long_mode(&vmx->vcpu)) { rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); } #endif } static void vmx_load_host_state(struct vcpu_vmx *vmx) { preempt_disable(); __vmx_load_host_state(vmx); preempt_enable(); } /* * 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, int cpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); u64 phys_addr = __pa(vmx->vmcs); u64 tsc_this, delta, new_offset; if (vcpu->cpu != cpu) { vcpu_clear(vmx); kvm_migrate_timers(vcpu); set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests); local_irq_disable(); list_add(&vmx->local_vcpus_link, &per_cpu(vcpus_on_cpu, cpu)); local_irq_enable(); } if (per_cpu(current_vmcs, cpu) != vmx->vmcs) { u8 error; per_cpu(current_vmcs, cpu) = vmx->vmcs; asm volatile (__ex(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", vmx->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, kvm_read_tr_base()); /* 22.2.4 */ kvm_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 */ /* * Make sure the time stamp counter is monotonous. */ rdtscll(tsc_this); if (tsc_this < vcpu->arch.host_tsc) { delta = vcpu->arch.host_tsc - tsc_this; new_offset = vmcs_read64(TSC_OFFSET) + delta; vmcs_write64(TSC_OFFSET, new_offset); } } } static void vmx_vcpu_put(struct kvm_vcpu *vcpu) { __vmx_load_host_state(to_vmx(vcpu)); } static void vmx_fpu_activate(struct kvm_vcpu *vcpu) { if (vcpu->fpu_active) return; vcpu->fpu_active = 1; vmcs_clear_bits(GUEST_CR0, X86_CR0_TS); if (vcpu->arch.cr0 & X86_CR0_TS) vmcs_set_bits(GUEST_CR0, X86_CR0_TS); update_exception_bitmap(vcpu); } static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu) { if (!vcpu->fpu_active) return; vcpu->fpu_active = 0; vmcs_set_bits(GUEST_CR0, X86_CR0_TS); update_exception_bitmap(vcpu); } static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu) { unsigned long rflags; rflags = vmcs_readl(GUEST_RFLAGS); if (to_vmx(vcpu)->rmode.vm86_active) rflags &= ~(unsigned long)(X86_EFLAGS_IOPL | X86_EFLAGS_VM); return rflags; } static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) { if (to_vmx(vcpu)->rmode.vm86_active) rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; vmcs_writel(GUEST_RFLAGS, rflags); } static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) { u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); int ret = 0; if (interruptibility & GUEST_INTR_STATE_STI) ret |= X86_SHADOW_INT_STI; if (interruptibility & GUEST_INTR_STATE_MOV_SS) ret |= X86_SHADOW_INT_MOV_SS; return ret & mask; } static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) { u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); u32 interruptibility = interruptibility_old; interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS); if (mask & X86_SHADOW_INT_MOV_SS) interruptibility |= GUEST_INTR_STATE_MOV_SS; if (mask & X86_SHADOW_INT_STI) interruptibility |= GUEST_INTR_STATE_STI; if ((interruptibility != interruptibility_old)) vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility); } static void skip_emulated_instruction(struct kvm_vcpu *vcpu) { unsigned long rip; rip = kvm_rip_read(vcpu); rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN); kvm_rip_write(vcpu, rip); /* skipping an emulated instruction also counts */ vmx_set_interrupt_shadow(vcpu, 0); } static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr, bool has_error_code, u32 error_code) { struct vcpu_vmx *vmx = to_vmx(vcpu); u32 intr_info = nr | INTR_INFO_VALID_MASK; if (has_error_code) { vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code); intr_info |= INTR_INFO_DELIVER_CODE_MASK; } if (vmx->rmode.vm86_active) { vmx->rmode.irq.pending = true; vmx->rmode.irq.vector = nr; vmx->rmode.irq.rip = kvm_rip_read(vcpu); if (kvm_exception_is_soft(nr)) vmx->rmode.irq.rip += vmx->vcpu.arch.event_exit_inst_len; intr_info |= INTR_TYPE_SOFT_INTR; vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info); vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1); kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1); return; } if (kvm_exception_is_soft(nr)) { vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, vmx->vcpu.arch.event_exit_inst_len); intr_info |= INTR_TYPE_SOFT_EXCEPTION; } else intr_info |= INTR_TYPE_HARD_EXCEPTION; vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info); } static bool vmx_rdtscp_supported(void) { return cpu_has_vmx_rdtscp(); } /* * Swap MSR entry in host/guest MSR entry array. */ static void move_msr_up(struct vcpu_vmx *vmx, int from, int to) { struct shared_msr_entry tmp; tmp = vmx->guest_msrs[to]; vmx->guest_msrs[to] = vmx->guest_msrs[from]; vmx->guest_msrs[from] = tmp; } /* * Set up the vmcs to automatically save and restore system * msrs. Don't touch the 64-bit msrs if the guest is in legacy * mode, as fiddling with msrs is very expensive. */ static void setup_msrs(struct vcpu_vmx *vmx) { int save_nmsrs, index; unsigned long *msr_bitmap; vmx_load_host_state(vmx); save_nmsrs = 0; #ifdef CONFIG_X86_64 if (is_long_mode(&vmx->vcpu)) { index = __find_msr_index(vmx, MSR_SYSCALL_MASK); if (index >= 0) move_msr_up(vmx, index, save_nmsrs++); index = __find_msr_index(vmx, MSR_LSTAR); if (index >= 0) move_msr_up(vmx, index, save_nmsrs++); index = __find_msr_index(vmx, MSR_CSTAR); if (index >= 0) move_msr_up(vmx, index, save_nmsrs++); index = __find_msr_index(vmx, MSR_TSC_AUX); if (index >= 0 && vmx->rdtscp_enabled) move_msr_up(vmx, index, save_nmsrs++); /* * MSR_K6_STAR is only needed on long mode guests, and only * if efer.sce is enabled. */ index = __find_msr_index(vmx, MSR_K6_STAR); if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE)) move_msr_up(vmx, index, save_nmsrs++); } #endif index = __find_msr_index(vmx, MSR_EFER); if (index >= 0 && update_transition_efer(vmx, index)) move_msr_up(vmx, index, save_nmsrs++); vmx->save_nmsrs = save_nmsrs; if (cpu_has_vmx_msr_bitmap()) { if (is_long_mode(&vmx->vcpu)) msr_bitmap = vmx_msr_bitmap_longmode; else msr_bitmap = vmx_msr_bitmap_legacy; vmcs_write64(MSR_BITMAP, __pa(msr_bitmap)); } } /* * 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) { vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc); } /* * 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 shared_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_KERNEL_GS_BASE: vmx_load_host_state(to_vmx(vcpu)); data = to_vmx(vcpu)->msr_guest_kernel_gs_base; break; #endif case MSR_EFER: return kvm_get_msr_common(vcpu, msr_index, pdata); case MSR_IA32_TSC: 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; case MSR_TSC_AUX: if (!to_vmx(vcpu)->rdtscp_enabled) return 1; /* Otherwise falls through */ default: vmx_load_host_state(to_vmx(vcpu)); msr = find_msr_entry(to_vmx(vcpu), msr_index); if (msr) { vmx_load_host_state(to_vmx(vcpu)); 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 vcpu_vmx *vmx = to_vmx(vcpu); struct shared_msr_entry *msr; u64 host_tsc; int ret = 0; switch (msr_index) { case MSR_EFER: vmx_load_host_state(vmx); ret = kvm_set_msr_common(vcpu, msr_index, data); break; #ifdef CONFIG_X86_64 case MSR_FS_BASE: vmcs_writel(GUEST_FS_BASE, data); break; case MSR_GS_BASE: vmcs_writel(GUEST_GS_BASE, data); break; case MSR_KERNEL_GS_BASE: vmx_load_host_state(vmx); vmx->msr_guest_kernel_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_TSC: rdtscll(host_tsc); guest_write_tsc(data, host_tsc); break; case MSR_IA32_CR_PAT: if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { vmcs_write64(GUEST_IA32_PAT, data); vcpu->arch.pat = data; break; } ret = kvm_set_msr_common(vcpu, msr_index, data); break; case MSR_TSC_AUX: if (!vmx->rdtscp_enabled) return 1; /* Check reserved bit, higher 32 bits should be zero */ if ((data >> 32) != 0) return 1; /* Otherwise falls through */ default: msr = find_msr_entry(vmx, msr_index); if (msr) { vmx_load_host_state(vmx); msr->data = data; break; } ret = kvm_set_msr_common(vcpu, msr_index, data); } return ret; } static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) { __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); switch (reg) { case VCPU_REGS_RSP: vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP); break; case VCPU_REGS_RIP: vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP); break; case VCPU_EXREG_PDPTR: if (enable_ept) ept_save_pdptrs(vcpu); break; default: break; } } static void set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) { if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]); else vmcs_writel(GUEST_DR7, vcpu->arch.dr7); update_exception_bitmap(vcpu); } static __init int cpu_has_kvm_support(void) { return cpu_has_vmx(); } static __init int vmx_disabled_by_bios(void) { u64 msr; rdmsrl(MSR_IA32_FEATURE_CONTROL, msr); return (msr & (FEATURE_CONTROL_LOCKED | FEATURE_CONTROL_VMXON_ENABLED)) == FEATURE_CONTROL_LOCKED; /* locked but not enabled */ } static int hardware_enable(void *garbage) { int cpu = raw_smp_processor_id(); u64 phys_addr = __pa(per_cpu(vmxarea, cpu)); u64 old; if (read_cr4() & X86_CR4_VMXE) return -EBUSY; INIT_LIST_HEAD(&per_cpu(vcpus_on_cpu, cpu)); rdmsrl(MSR_IA32_FEATURE_CONTROL, old); if ((old & (FEATURE_CONTROL_LOCKED | FEATURE_CONTROL_VMXON_ENABLED)) != (FEATURE_CONTROL_LOCKED | FEATURE_CONTROL_VMXON_ENABLED)) /* enable and lock */ wrmsrl(MSR_IA32_FEATURE_CONTROL, old | FEATURE_CONTROL_LOCKED | FEATURE_CONTROL_VMXON_ENABLED); write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */ asm volatile (ASM_VMX_VMXON_RAX : : "a"(&phys_addr), "m"(phys_addr) : "memory", "cc"); ept_sync_global(); return 0; } static void vmclear_local_vcpus(void) { int cpu = raw_smp_processor_id(); struct vcpu_vmx *vmx, *n; list_for_each_entry_safe(vmx, n, &per_cpu(vcpus_on_cpu, cpu), local_vcpus_link) __vcpu_clear(vmx); } /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot() * tricks. */ static void kvm_cpu_vmxoff(void) { asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc"); write_cr4(read_cr4() & ~X86_CR4_VMXE); } static void hardware_disable(void *garbage) { vmclear_local_vcpus(); kvm_cpu_vmxoff(); } static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt, u32 msr, u32 *result) { u32 vmx_msr_low, vmx_msr_high; u32 ctl = ctl_min | ctl_opt; rdmsr(msr, vmx_msr_low, vmx_msr_high); ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */ ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */ /* Ensure minimum (required) set of control bits are supported. */ if (ctl_min & ~ctl) return -EIO; *result = ctl; return 0; } static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf) { u32 vmx_msr_low, vmx_msr_high; u32 min, opt, min2, opt2; u32 _pin_based_exec_control = 0; u32 _cpu_based_exec_control = 0; u32 _cpu_based_2nd_exec_control = 0; u32 _vmexit_control = 0; u32 _vmentry_control = 0; min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING; opt = PIN_BASED_VIRTUAL_NMIS; if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS, &_pin_based_exec_control) < 0) return -EIO; min = CPU_BASED_HLT_EXITING | #ifdef CONFIG_X86_64 CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING | #endif CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING | CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MOV_DR_EXITING | CPU_BASED_USE_TSC_OFFSETING | CPU_BASED_MWAIT_EXITING | CPU_BASED_MONITOR_EXITING | CPU_BASED_INVLPG_EXITING; opt = CPU_BASED_TPR_SHADOW | CPU_BASED_USE_MSR_BITMAPS | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS, &_cpu_based_exec_control) < 0) return -EIO; #ifdef CONFIG_X86_64 if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)) _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING & ~CPU_BASED_CR8_STORE_EXITING; #endif if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) { min2 = 0; opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | SECONDARY_EXEC_WBINVD_EXITING | SECONDARY_EXEC_ENABLE_VPID | SECONDARY_EXEC_ENABLE_EPT | SECONDARY_EXEC_UNRESTRICTED_GUEST | SECONDARY_EXEC_PAUSE_LOOP_EXITING | SECONDARY_EXEC_RDTSCP; if (adjust_vmx_controls(min2, opt2, MSR_IA32_VMX_PROCBASED_CTLS2, &_cpu_based_2nd_exec_control) < 0) return -EIO; } #ifndef CONFIG_X86_64 if (!(_cpu_based_2nd_exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW; #endif if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) { /* CR3 accesses and invlpg don't need to cause VM Exits when EPT enabled */ _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING | CPU_BASED_INVLPG_EXITING); rdmsr(MSR_IA32_VMX_EPT_VPID_CAP, vmx_capability.ept, vmx_capability.vpid); } min = 0; #ifdef CONFIG_X86_64 min |= VM_EXIT_HOST_ADDR_SPACE_SIZE; #endif opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT; if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS, &_vmexit_control) < 0) return -EIO; min = 0; opt = VM_ENTRY_LOAD_IA32_PAT; if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS, &_vmentry_control) < 0) return -EIO; rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high); /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */ if ((vmx_msr_high & 0x1fff) > PAGE_SIZE) return -EIO; #ifdef CONFIG_X86_64 /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */ if (vmx_msr_high & (1u<<16)) return -EIO; #endif /* Require Write-Back (WB) memory type for VMCS accesses. */ if (((vmx_msr_high >> 18) & 15) != 6) return -EIO; vmcs_conf->size = vmx_msr_high & 0x1fff; vmcs_conf->order = get_order(vmcs_config.size); vmcs_conf->revision_id = vmx_msr_low; vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control; vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control; vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control; vmcs_conf->vmexit_ctrl = _vmexit_control; vmcs_conf->vmentry_ctrl = _vmentry_control; return 0; } static struct vmcs *alloc_vmcs_cpu(int cpu) { int node = cpu_to_node(cpu); struct page *pages; struct vmcs *vmcs; pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order); if (!pages) return NULL; vmcs = page_address(pages); memset(vmcs, 0, vmcs_config.size); vmcs->revision_id = vmcs_config.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_config.order); } static void free_kvm_area(void) { int cpu; for_each_possible_cpu(cpu) { free_vmcs(per_cpu(vmxarea, cpu)); per_cpu(vmxarea, cpu) = NULL; } } static __init int alloc_kvm_area(void) { int cpu; for_each_possible_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) { if (setup_vmcs_config(&vmcs_config) < 0) return -EIO; if (boot_cpu_has(X86_FEATURE_NX)) kvm_enable_efer_bits(EFER_NX); if (!cpu_has_vmx_vpid()) enable_vpid = 0; if (!cpu_has_vmx_ept()) { enable_ept = 0; enable_unrestricted_guest = 0; } if (!cpu_has_vmx_unrestricted_guest()) enable_unrestricted_guest = 0; if (!cpu_has_vmx_flexpriority()) flexpriority_enabled = 0; if (!cpu_has_vmx_tpr_shadow()) kvm_x86_ops->update_cr8_intercept = NULL; if (enable_ept && !cpu_has_vmx_ept_2m_page()) kvm_disable_largepages(); if (!cpu_has_vmx_ple()) ple_gap = 0; return alloc_kvm_area(); } static __exit void hardware_unsetup(void) { free_kvm_area(); } 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; struct vcpu_vmx *vmx = to_vmx(vcpu); vmx->emulation_required = 1; vmx->rmode.vm86_active = 0; vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base); vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit); vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar); flags = vmcs_readl(GUEST_RFLAGS); flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM); flags |= (vmx->rmode.save_iopl << IOPL_SHIFT); vmcs_writel(GUEST_RFLAGS, flags); vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) | (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME)); update_exception_bitmap(vcpu); if (emulate_invalid_guest_state) return; fix_pmode_dataseg(VCPU_SREG_ES, &vmx->rmode.es); fix_pmode_dataseg(VCPU_SREG_DS, &vmx->rmode.ds); fix_pmode_dataseg(VCPU_SREG_GS, &vmx->rmode.gs); fix_pmode_dataseg(VCPU_SREG_FS, &vmx->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 gva_t rmode_tss_base(struct kvm *kvm) { if (!kvm->arch.tss_addr) { struct kvm_memslots *slots; gfn_t base_gfn; slots = rcu_dereference(kvm->memslots); base_gfn = kvm->memslots->memslots[0].base_gfn + kvm->memslots->memslots[0].npages - 3; return base_gfn << PAGE_SHIFT; } return kvm->arch.tss_addr; } 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, save->base >> 4); vmcs_write32(sf->base, save->base & 0xfffff); vmcs_write32(sf->limit, 0xffff); vmcs_write32(sf->ar_bytes, 0xf3); } static void enter_rmode(struct kvm_vcpu *vcpu) { unsigned long flags; struct vcpu_vmx *vmx = to_vmx(vcpu); if (enable_unrestricted_guest) return; vmx->emulation_required = 1; vmx->rmode.vm86_active = 1; vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE); vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm)); vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT); vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1); vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES); vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); flags = vmcs_readl(GUEST_RFLAGS); vmx->rmode.save_iopl = (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; vmcs_writel(GUEST_RFLAGS, flags); vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME); update_exception_bitmap(vcpu); if (emulate_invalid_guest_state) goto continue_rmode; 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); if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000) vmcs_writel(GUEST_CS_BASE, 0xf0000); vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4); fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es); fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds); fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs); fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs); continue_rmode: kvm_mmu_reset_context(vcpu); init_rmode(vcpu->kvm); } static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer) { struct vcpu_vmx *vmx = to_vmx(vcpu); struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER); if (!msr) return; /* * Force kernel_gs_base reloading before EFER changes, as control * of this msr depends on is_long_mode(). */ vmx_load_host_state(to_vmx(vcpu)); vcpu->arch.shadow_efer = efer; if (!msr) return; if (efer & EFER_LMA) { vmcs_write32(VM_ENTRY_CONTROLS, vmcs_read32(VM_ENTRY_CONTROLS) | VM_ENTRY_IA32E_MODE); msr->data = efer; } else { vmcs_write32(VM_ENTRY_CONTROLS, vmcs_read32(VM_ENTRY_CONTROLS) & ~VM_ENTRY_IA32E_MODE); msr->data = efer & ~EFER_LME; } setup_msrs(vmx); } #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", __func__); vmcs_write32(GUEST_TR_AR_BYTES, (guest_tr_ar & ~AR_TYPE_MASK) | AR_TYPE_BUSY_64_TSS); } vcpu->arch.shadow_efer |= EFER_LMA; vmx_set_efer(vcpu, vcpu->arch.shadow_efer); } static void exit_lmode(struct kvm_vcpu *vcpu) { vcpu->arch.shadow_efer &= ~EFER_LMA; vmcs_write32(VM_ENTRY_CONTROLS, vmcs_read32(VM_ENTRY_CONTROLS) & ~VM_ENTRY_IA32E_MODE); } #endif static void vmx_flush_tlb(struct kvm_vcpu *vcpu) { vpid_sync_vcpu_all(to_vmx(vcpu)); if (enable_ept) ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa)); } static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) { ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits; vcpu->arch.cr4 &= ~cr4_guest_owned_bits; vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & cr4_guest_owned_bits; } static void ept_load_pdptrs(struct kvm_vcpu *vcpu) { if (!test_bit(VCPU_EXREG_PDPTR, (unsigned long *)&vcpu->arch.regs_dirty)) return; if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) { vmcs_write64(GUEST_PDPTR0, vcpu->arch.pdptrs[0]); vmcs_write64(GUEST_PDPTR1, vcpu->arch.pdptrs[1]); vmcs_write64(GUEST_PDPTR2, vcpu->arch.pdptrs[2]); vmcs_write64(GUEST_PDPTR3, vcpu->arch.pdptrs[3]); } } static void ept_save_pdptrs(struct kvm_vcpu *vcpu) { if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) { vcpu->arch.pdptrs[0] = vmcs_read64(GUEST_PDPTR0); vcpu->arch.pdptrs[1] = vmcs_read64(GUEST_PDPTR1); vcpu->arch.pdptrs[2] = vmcs_read64(GUEST_PDPTR2); vcpu->arch.pdptrs[3] = vmcs_read64(GUEST_PDPTR3); } __set_bit(VCPU_EXREG_PDPTR, (unsigned long *)&vcpu->arch.regs_avail); __set_bit(VCPU_EXREG_PDPTR, (unsigned long *)&vcpu->arch.regs_dirty); } static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4); static void ept_update_paging_mode_cr0(unsigned long *hw_cr0, unsigned long cr0, struct kvm_vcpu *vcpu) { if (!(cr0 & X86_CR0_PG)) { /* From paging/starting to nonpaging */ vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) | (CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING)); vcpu->arch.cr0 = cr0; vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); } else if (!is_paging(vcpu)) { /* From nonpaging to paging */ vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) & ~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING)); vcpu->arch.cr0 = cr0; vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); } if (!(cr0 & X86_CR0_WP)) *hw_cr0 &= ~X86_CR0_WP; } static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) { struct vcpu_vmx *vmx = to_vmx(vcpu); unsigned long hw_cr0; if (enable_unrestricted_guest) hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST) | KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST; else hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON; vmx_fpu_deactivate(vcpu); if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE)) enter_pmode(vcpu); if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE)) enter_rmode(vcpu); #ifdef CONFIG_X86_64 if (vcpu->arch.shadow_efer & EFER_LME) { if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) enter_lmode(vcpu); if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) exit_lmode(vcpu); } #endif if (enable_ept) ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu); vmcs_writel(CR0_READ_SHADOW, cr0); vmcs_writel(GUEST_CR0, hw_cr0); vcpu->arch.cr0 = cr0; if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE)) vmx_fpu_activate(vcpu); } static u64 construct_eptp(unsigned long root_hpa) { u64 eptp; /* TODO write the value reading from MSR */ eptp = VMX_EPT_DEFAULT_MT | VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT; eptp |= (root_hpa & PAGE_MASK); return eptp; } static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) { unsigned long guest_cr3; u64 eptp; guest_cr3 = cr3; if (enable_ept) { eptp = construct_eptp(cr3); vmcs_write64(EPT_POINTER, eptp); guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 : vcpu->kvm->arch.ept_identity_map_addr; ept_load_pdptrs(vcpu); } vmx_flush_tlb(vcpu); vmcs_writel(GUEST_CR3, guest_cr3); if (vcpu->arch.cr0 & X86_CR0_PE) vmx_fpu_deactivate(vcpu); } static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) { unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ? KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON); vcpu->arch.cr4 = cr4; if (enable_ept) { if (!is_paging(vcpu)) { hw_cr4 &= ~X86_CR4_PAE; hw_cr4 |= X86_CR4_PSE; } else if (!(cr4 & X86_CR4_PAE)) { hw_cr4 &= ~X86_CR4_PAE; } } vmcs_writel(CR4_READ_SHADOW, cr4); vmcs_writel(GUEST_CR4, hw_cr4); } 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) && !emulate_invalid_guest_state) 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 int vmx_get_cpl(struct kvm_vcpu *vcpu) { if (!(vcpu->arch.cr0 & X86_CR0_PE)) /* if real mode */ return 0; if (vmx_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */ return 3; return vmcs_read16(GUEST_CS_SELECTOR) & 3; } static u32 vmx_segment_access_rights(struct kvm_segment *var) { u32 ar; 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; return ar; } static void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { struct vcpu_vmx *vmx = to_vmx(vcpu); struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; u32 ar; if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) { vmx->rmode.tr.selector = var->selector; vmx->rmode.tr.base = var->base; vmx->rmode.tr.limit = var->limit; vmx->rmode.tr.ar = vmx_segment_access_rights(var); return; } vmcs_writel(sf->base, var->base); vmcs_write32(sf->limit, var->limit); vmcs_write16(sf->selector, var->selector); if (vmx->rmode.vm86_active && var->s) { /* * Hack real-mode segments into vm86 compatibility. */ if (var->base == 0xffff0000 && var->selector == 0xf000) vmcs_writel(sf->base, 0xf0000); ar = 0xf3; } else ar = vmx_segment_access_rights(var); /* * Fix the "Accessed" bit in AR field of segment registers for older * qemu binaries. * IA32 arch specifies that at the time of processor reset the * "Accessed" bit in the AR field of segment registers is 1. And qemu * is setting it to 0 in the usedland code. This causes invalid guest * state vmexit when "unrestricted guest" mode is turned on. * Fix for this setup issue in cpu_reset is being pushed in the qemu * tree. Newer qemu binaries with that qemu fix would not need this * kvm hack. */ if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR)) ar |= 0x1; /* Accessed */ 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 bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg) { struct kvm_segment var; u32 ar; vmx_get_segment(vcpu, &var, seg); ar = vmx_segment_access_rights(&var); if (var.base != (var.selector << 4)) return false; if (var.limit != 0xffff) return false; if (ar != 0xf3) return false; return true; } static bool code_segment_valid(struct kvm_vcpu *vcpu) { struct kvm_segment cs; unsigned int cs_rpl; vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); cs_rpl = cs.selector & SELECTOR_RPL_MASK; if (cs.unusable) return false; if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK)) return false; if (!cs.s) return false; if (cs.type & AR_TYPE_WRITEABLE_MASK) { if (cs.dpl > cs_rpl) return false; } else { if (cs.dpl != cs_rpl) return false; } if (!cs.present) return false; /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */ return true; } static bool stack_segment_valid(struct kvm_vcpu *vcpu) { struct kvm_segment ss; unsigned int ss_rpl; vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); ss_rpl = ss.selector & SELECTOR_RPL_MASK; if (ss.unusable) return true; if (ss.type != 3 && ss.type != 7) return false; if (!ss.s) return false; if (ss.dpl != ss_rpl) /* DPL != RPL */ return false; if (!ss.present) return false; return true; } static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg) { struct kvm_segment var; unsigned int rpl; vmx_get_segment(vcpu, &var, seg); rpl = var.selector & SELECTOR_RPL_MASK; if (var.unusable) return true; if (!var.s) return false; if (!var.present) return false; if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) { if (var.dpl < rpl) /* DPL < RPL */ return false; } /* TODO: Add other members to kvm_segment_field to allow checking for other access * rights flags */ return true; } static bool tr_valid(struct kvm_vcpu *vcpu) { struct kvm_segment tr; vmx_get_segment(vcpu, &tr, VCPU_SREG_TR); if (tr.unusable) return false; if (tr.selector & SELECTOR_TI_MASK) /* TI = 1 */ return false; if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */ return false; if (!tr.present) return false; return true; } static bool ldtr_valid(struct kvm_vcpu *vcpu) { struct kvm_segment ldtr; vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR); if (ldtr.unusable) return true; if (ldtr.selector & SELECTOR_TI_MASK) /* TI = 1 */ return false; if (ldtr.type != 2) return false; if (!ldtr.present) return false; return true; } static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu) { struct kvm_segment cs, ss; vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); return ((cs.selector & SELECTOR_RPL_MASK) == (ss.selector & SELECTOR_RPL_MASK)); } /* * Check if guest state is valid. Returns true if valid, false if * not. * We assume that registers are always usable */ static bool guest_state_valid(struct kvm_vcpu *vcpu) { /* real mode guest state checks */ if (!(vcpu->arch.cr0 & X86_CR0_PE)) { if (!rmode_segment_valid(vcpu, VCPU_SREG_CS)) return false; if (!rmode_segment_valid(vcpu, VCPU_SREG_SS)) return false; if (!rmode_segment_valid(vcpu, VCPU_SREG_DS)) return false; if (!rmode_segment_valid(vcpu, VCPU_SREG_ES)) return false; if (!rmode_segment_valid(vcpu, VCPU_SREG_FS)) return false; if (!rmode_segment_valid(vcpu, VCPU_SREG_GS)) return false; } else { /* protected mode guest state checks */ if (!cs_ss_rpl_check(vcpu)) return false; if (!code_segment_valid(vcpu)) return false; if (!stack_segment_valid(vcpu)) return false; if (!data_segment_valid(vcpu, VCPU_SREG_DS)) return false; if (!data_segment_valid(vcpu, VCPU_SREG_ES)) return false; if (!data_segment_valid(vcpu, VCPU_SREG_FS)) return false; if (!data_segment_valid(vcpu, VCPU_SREG_GS)) return false; if (!tr_valid(vcpu)) return false; if (!ldtr_valid(vcpu)) return false; } /* TODO: * - Add checks on RIP * - Add checks on RFLAGS */ return true; } static int init_rmode_tss(struct kvm *kvm) { gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT; u16 data = 0; int ret = 0; int r; r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); if (r < 0) goto out; data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE; r = kvm_write_guest_page(kvm, fn++, &data, TSS_IOPB_BASE_OFFSET, sizeof(u16)); if (r < 0) goto out; r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE); if (r < 0) goto out; r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); if (r < 0) goto out; data = ~0; r = kvm_write_guest_page(kvm, fn, &data, RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1, sizeof(u8)); if (r < 0) goto out; ret = 1; out: return ret; } static int init_rmode_identity_map(struct kvm *kvm) { int i, r, ret; pfn_t identity_map_pfn; u32 tmp; if (!enable_ept) return 1; if (unlikely(!kvm->arch.ept_identity_pagetable)) { printk(KERN_ERR "EPT: identity-mapping pagetable " "haven't been allocated!\n"); return 0; } if (likely(kvm->arch.ept_identity_pagetable_done)) return 1; ret = 0; identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT; r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE); if (r < 0) goto out; /* Set up identity-mapping pagetable for EPT in real mode */ for (i = 0; i < PT32_ENT_PER_PAGE; i++) { tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE); r = kvm_write_guest_page(kvm, identity_map_pfn, &tmp, i * sizeof(tmp), sizeof(tmp)); if (r < 0) goto out; } kvm->arch.ept_identity_pagetable_done = true; ret = 1; out: return ret; } static void seg_setup(int seg) { struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; unsigned int ar; vmcs_write16(sf->selector, 0); vmcs_writel(sf->base, 0); vmcs_write32(sf->limit, 0xffff); if (enable_unrestricted_guest) { ar = 0x93; if (seg == VCPU_SREG_CS) ar |= 0x08; /* code segment */ } else ar = 0xf3; vmcs_write32(sf->ar_bytes, ar); } static int alloc_apic_access_page(struct kvm *kvm) { struct kvm_userspace_memory_region kvm_userspace_mem; int r = 0; mutex_lock(&kvm->slots_lock); if (kvm->arch.apic_access_page) goto out; kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT; kvm_userspace_mem.flags = 0; kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL; kvm_userspace_mem.memory_size = PAGE_SIZE; r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0); if (r) goto out; kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00); out: mutex_unlock(&kvm->slots_lock); return r; } static int alloc_identity_pagetable(struct kvm *kvm) { struct kvm_userspace_memory_region kvm_userspace_mem; int r = 0; mutex_lock(&kvm->slots_lock); if (kvm->arch.ept_identity_pagetable) goto out; kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT; kvm_userspace_mem.flags = 0; kvm_userspace_mem.guest_phys_addr = kvm->arch.ept_identity_map_addr; kvm_userspace_mem.memory_size = PAGE_SIZE; r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0); if (r) goto out; kvm->arch.ept_identity_pagetable = gfn_to_page(kvm, kvm->arch.ept_identity_map_addr >> PAGE_SHIFT); out: mutex_unlock(&kvm->slots_lock); return r; } static void allocate_vpid(struct vcpu_vmx *vmx) { int vpid; vmx->vpid = 0; if (!enable_vpid) return; spin_lock(&vmx_vpid_lock); vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS); if (vpid < VMX_NR_VPIDS) { vmx->vpid = vpid; __set_bit(vpid, vmx_vpid_bitmap); } spin_unlock(&vmx_vpid_lock); } static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr) { int f = sizeof(unsigned long); if (!cpu_has_vmx_msr_bitmap()) return; /* * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals * have the write-low and read-high bitmap offsets the wrong way round. * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. */ if (msr <= 0x1fff) { __clear_bit(msr, msr_bitmap + 0x000 / f); /* read-low */ __clear_bit(msr, msr_bitmap + 0x800 / f); /* write-low */ } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { msr &= 0x1fff; __clear_bit(msr, msr_bitmap + 0x400 / f); /* read-high */ __clear_bit(msr, msr_bitmap + 0xc00 / f); /* write-high */ } } static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only) { if (!longmode_only) __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr); __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr); } /* * Sets up the vmcs for emulated real mode. */ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) { u32 host_sysenter_cs, msr_low, msr_high; u32 junk; u64 host_pat, tsc_this, tsc_base; unsigned long a; struct descriptor_table dt; int i; unsigned long kvm_vmx_return; u32 exec_control; /* I/O */ vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a)); vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b)); if (cpu_has_vmx_msr_bitmap()) vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy)); vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */ /* Control */ vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, vmcs_config.pin_based_exec_ctrl); exec_control = vmcs_config.cpu_based_exec_ctrl; if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) { exec_control &= ~CPU_BASED_TPR_SHADOW; #ifdef CONFIG_X86_64 exec_control |= CPU_BASED_CR8_STORE_EXITING | CPU_BASED_CR8_LOAD_EXITING; #endif } if (!enable_ept) exec_control |= CPU_BASED_CR3_STORE_EXITING | CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_INVLPG_EXITING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control); if (cpu_has_secondary_exec_ctrls()) { exec_control = vmcs_config.cpu_based_2nd_exec_ctrl; if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; if (vmx->vpid == 0) exec_control &= ~SECONDARY_EXEC_ENABLE_VPID; if (!enable_ept) { exec_control &= ~SECONDARY_EXEC_ENABLE_EPT; enable_unrestricted_guest = 0; } if (!enable_unrestricted_guest) exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST; if (!ple_gap) exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING; vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control); } if (ple_gap) { vmcs_write32(PLE_GAP, ple_gap); vmcs_write32(PLE_WINDOW, ple_window); } vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf); vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf); 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, kvm_read_fs()); /* 22.2.4 */ vmcs_write16(HOST_GS_SELECTOR, kvm_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 */ kvm_get_idt(&dt); vmcs_writel(HOST_IDTR_BASE, dt.base); /* 22.2.4 */ asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return)); vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */ vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0); vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0); vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0); 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 */ if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) { rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high); host_pat = msr_low | ((u64) msr_high << 32); vmcs_write64(HOST_IA32_PAT, host_pat); } if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high); host_pat = msr_low | ((u64) msr_high << 32); /* Write the default value follow host pat */ vmcs_write64(GUEST_IA32_PAT, host_pat); /* Keep arch.pat sync with GUEST_IA32_PAT */ vmx->vcpu.arch.pat = host_pat; } for (i = 0; i < NR_VMX_MSR; ++i) { u32 index = vmx_msr_index[i]; u32 data_low, data_high; int j = vmx->nmsrs; if (rdmsr_safe(index, &data_low, &data_high) < 0) continue; if (wrmsr_safe(index, data_low, data_high) < 0) continue; vmx->guest_msrs[j].index = i; vmx->guest_msrs[j].data = 0; vmx->guest_msrs[j].mask = -1ull; ++vmx->nmsrs; } vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl); /* 22.2.1, 20.8.1 */ vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl); vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL); vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS; if (enable_ept) vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE; vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits); tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc; rdtscll(tsc_this); if (tsc_this < vmx->vcpu.kvm->arch.vm_init_tsc) tsc_base = tsc_this; guest_write_tsc(0, tsc_base); return 0; } static int init_rmode(struct kvm *kvm) { if (!init_rmode_tss(kvm)) return 0; if (!init_rmode_identity_map(kvm)) return 0; return 1; } static int vmx_vcpu_reset(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); u64 msr; int ret, idx; vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)); idx = srcu_read_lock(&vcpu->kvm->srcu); if (!init_rmode(vmx->vcpu.kvm)) { ret = -ENOMEM; goto out; } vmx->rmode.vm86_active = 0; vmx->soft_vnmi_blocked = 0; vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val(); kvm_set_cr8(&vmx->vcpu, 0); msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE; if (kvm_vcpu_is_bsp(&vmx->vcpu)) msr |= MSR_IA32_APICBASE_BSP; kvm_set_apic_base(&vmx->vcpu, msr); fx_init(&vmx->vcpu); seg_setup(VCPU_SREG_CS); /* * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh. */ if (kvm_vcpu_is_bsp(&vmx->vcpu)) { vmcs_write16(GUEST_CS_SELECTOR, 0xf000); vmcs_writel(GUEST_CS_BASE, 0x000f0000); } else { vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8); vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12); } 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); if (kvm_vcpu_is_bsp(&vmx->vcpu)) kvm_rip_write(vcpu, 0xfff0); else kvm_rip_write(vcpu, 0); kvm_register_write(vcpu, VCPU_REGS_RSP, 0); 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); /* Special registers */ vmcs_write64(GUEST_IA32_DEBUGCTL, 0); setup_msrs(vmx); vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */ if (cpu_has_vmx_tpr_shadow()) { vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0); if (vm_need_tpr_shadow(vmx->vcpu.kvm)) vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, page_to_phys(vmx->vcpu.arch.apic->regs_page)); vmcs_write32(TPR_THRESHOLD, 0); } if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) vmcs_write64(APIC_ACCESS_ADDR, page_to_phys(vmx->vcpu.kvm->arch.apic_access_page)); if (vmx->vpid != 0) vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid); vmx->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET; vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */ vmx_set_cr4(&vmx->vcpu, 0); vmx_set_efer(&vmx->vcpu, 0); vmx_fpu_activate(&vmx->vcpu); update_exception_bitmap(&vmx->vcpu); vpid_sync_vcpu_all(vmx); ret = 0; /* HACK: Don't enable emulation on guest boot/reset */ vmx->emulation_required = 0; out: srcu_read_unlock(&vcpu->kvm->srcu, idx); return ret; } static void enable_irq_window(struct kvm_vcpu *vcpu) { u32 cpu_based_vm_exec_control; cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); } static void enable_nmi_window(struct kvm_vcpu *vcpu) { u32 cpu_based_vm_exec_control; if (!cpu_has_virtual_nmis()) { enable_irq_window(vcpu); return; } cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); } static void vmx_inject_irq(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); uint32_t intr; int irq = vcpu->arch.interrupt.nr; trace_kvm_inj_virq(irq); ++vcpu->stat.irq_injections; if (vmx->rmode.vm86_active) { vmx->rmode.irq.pending = true; vmx->rmode.irq.vector = irq; vmx->rmode.irq.rip = kvm_rip_read(vcpu); if (vcpu->arch.interrupt.soft) vmx->rmode.irq.rip += vmx->vcpu.arch.event_exit_inst_len; vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK); vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1); kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1); return; } intr = irq | INTR_INFO_VALID_MASK; if (vcpu->arch.interrupt.soft) { intr |= INTR_TYPE_SOFT_INTR; vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, vmx->vcpu.arch.event_exit_inst_len); } else intr |= INTR_TYPE_EXT_INTR; vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr); } static void vmx_inject_nmi(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); if (!cpu_has_virtual_nmis()) { /* * Tracking the NMI-blocked state in software is built upon * finding the next open IRQ window. This, in turn, depends on * well-behaving guests: They have to keep IRQs disabled at * least as long as the NMI handler runs. Otherwise we may * cause NMI nesting, maybe breaking the guest. But as this is * highly unlikely, we can live with the residual risk. */ vmx->soft_vnmi_blocked = 1; vmx->vnmi_blocked_time = 0; } ++vcpu->stat.nmi_injections; if (vmx->rmode.vm86_active) { vmx->rmode.irq.pending = true; vmx->rmode.irq.vector = NMI_VECTOR; vmx->rmode.irq.rip = kvm_rip_read(vcpu); vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, NMI_VECTOR | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK); vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1); kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1); return; } vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR); } static int vmx_nmi_allowed(struct kvm_vcpu *vcpu) { if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked) return 0; return !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_NMI)); } static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu) { if (!cpu_has_virtual_nmis()) return to_vmx(vcpu)->soft_vnmi_blocked; else return !!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI); } static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked) { struct vcpu_vmx *vmx = to_vmx(vcpu); if (!cpu_has_virtual_nmis()) { if (vmx->soft_vnmi_blocked != masked) { vmx->soft_vnmi_blocked = masked; vmx->vnmi_blocked_time = 0; } } else { if (masked) vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI); else vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI); } } static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu) { return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) && !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS)); } static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr) { int ret; struct kvm_userspace_memory_region tss_mem = { .slot = TSS_PRIVATE_MEMSLOT, .guest_phys_addr = addr, .memory_size = PAGE_SIZE * 3, .flags = 0, }; ret = kvm_set_memory_region(kvm, &tss_mem, 0); if (ret) return ret; kvm->arch.tss_addr = addr; return 0; } static int handle_rmode_exception(struct kvm_vcpu *vcpu, int vec, u32 err_code) { /* * Instruction with address size override prefix opcode 0x67 * Cause the #SS fault with 0 error code in VM86 mode. */ if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0) if (emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE) return 1; /* * Forward all other exceptions that are valid in real mode. * FIXME: Breaks guest debugging in real mode, needs to be fixed with * the required debugging infrastructure rework. */ switch (vec) { case DB_VECTOR: if (vcpu->guest_debug & (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) return 0; kvm_queue_exception(vcpu, vec); return 1; case BP_VECTOR: if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) return 0; /* fall through */ case DE_VECTOR: case OF_VECTOR: case BR_VECTOR: case UD_VECTOR: case DF_VECTOR: case SS_VECTOR: case GP_VECTOR: case MF_VECTOR: kvm_queue_exception(vcpu, vec); return 1; } return 0; } /* * Trigger machine check on the host. We assume all the MSRs are already set up * by the CPU and that we still run on the same CPU as the MCE occurred on. * We pass a fake environment to the machine check handler because we want * the guest to be always treated like user space, no matter what context * it used internally. */ static void kvm_machine_check(void) { #if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64) struct pt_regs regs = { .cs = 3, /* Fake ring 3 no matter what the guest ran on */ .flags = X86_EFLAGS_IF, }; do_machine_check(®s, 0); #endif } static int handle_machine_check(struct kvm_vcpu *vcpu) { /* already handled by vcpu_run */ return 1; } static int handle_exception(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); struct kvm_run *kvm_run = vcpu->run; u32 intr_info, ex_no, error_code; unsigned long cr2, rip, dr6; u32 vect_info; enum emulation_result er; vect_info = vmx->idt_vectoring_info; intr_info = vmcs_read32(VM_EXIT_INTR_INFO); if (is_machine_check(intr_info)) return handle_machine_check(vcpu); if ((vect_info & VECTORING_INFO_VALID_MASK) && !is_page_fault(intr_info)) { vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX; vcpu->run->internal.ndata = 2; vcpu->run->internal.data[0] = vect_info; vcpu->run->internal.data[1] = intr_info; return 0; } if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR) return 1; /* already handled by vmx_vcpu_run() */ if (is_no_device(intr_info)) { vmx_fpu_activate(vcpu); return 1; } if (is_invalid_opcode(intr_info)) { er = emulate_instruction(vcpu, 0, 0, EMULTYPE_TRAP_UD); if (er != EMULATE_DONE) kvm_queue_exception(vcpu, UD_VECTOR); return 1; } error_code = 0; rip = kvm_rip_read(vcpu); if (intr_info & INTR_INFO_DELIVER_CODE_MASK) error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE); if (is_page_fault(intr_info)) { /* EPT won't cause page fault directly */ if (enable_ept) BUG(); cr2 = vmcs_readl(EXIT_QUALIFICATION); trace_kvm_page_fault(cr2, error_code); if (kvm_event_needs_reinjection(vcpu)) kvm_mmu_unprotect_page_virt(vcpu, cr2); return kvm_mmu_page_fault(vcpu, cr2, error_code); } if (vmx->rmode.vm86_active && handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK, error_code)) { if (vcpu->arch.halt_request) { vcpu->arch.halt_request = 0; return kvm_emulate_halt(vcpu); } return 1; } ex_no = intr_info & INTR_INFO_VECTOR_MASK; switch (ex_no) { case DB_VECTOR: dr6 = vmcs_readl(EXIT_QUALIFICATION); if (!(vcpu->guest_debug & (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) { vcpu->arch.dr6 = dr6 | DR6_FIXED_1; kvm_queue_exception(vcpu, DB_VECTOR); return 1; } kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1; kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7); /* fall through */ case BP_VECTOR: kvm_run->exit_reason = KVM_EXIT_DEBUG; kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip; kvm_run->debug.arch.exception = ex_no; break; default: kvm_run->exit_reason = KVM_EXIT_EXCEPTION; kvm_run->ex.exception = ex_no; kvm_run->ex.error_code = error_code; break; } return 0; } static int handle_external_interrupt(struct kvm_vcpu *vcpu) { ++vcpu->stat.irq_exits; return 1; } static int handle_triple_fault(struct kvm_vcpu *vcpu) { vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; return 0; } static int handle_io(struct kvm_vcpu *vcpu) { unsigned long exit_qualification; int size, in, string; unsigned port; ++vcpu->stat.io_exits; exit_qualification = vmcs_readl(EXIT_QUALIFICATION); string = (exit_qualification & 16) != 0; if (string) { if (emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DO_MMIO) return 0; return 1; } size = (exit_qualification & 7) + 1; in = (exit_qualification & 8) != 0; port = exit_qualification >> 16; skip_emulated_instruction(vcpu); return kvm_emulate_pio(vcpu, in, size, port); } 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; } static int handle_cr(struct kvm_vcpu *vcpu) { unsigned long exit_qualification, val; int cr; int reg; exit_qualification = vmcs_readl(EXIT_QUALIFICATION); cr = exit_qualification & 15; reg = (exit_qualification >> 8) & 15; switch ((exit_qualification >> 4) & 3) { case 0: /* mov to cr */ val = kvm_register_read(vcpu, reg); trace_kvm_cr_write(cr, val); switch (cr) { case 0: kvm_set_cr0(vcpu, val); skip_emulated_instruction(vcpu); return 1; case 3: kvm_set_cr3(vcpu, val); skip_emulated_instruction(vcpu); return 1; case 4: kvm_set_cr4(vcpu, val); skip_emulated_instruction(vcpu); return 1; case 8: { u8 cr8_prev = kvm_get_cr8(vcpu); u8 cr8 = kvm_register_read(vcpu, reg); kvm_set_cr8(vcpu, cr8); skip_emulated_instruction(vcpu); if (irqchip_in_kernel(vcpu->kvm)) return 1; if (cr8_prev <= cr8) return 1; vcpu->run->exit_reason = KVM_EXIT_SET_TPR; return 0; } }; break; case 2: /* clts */ vmx_fpu_deactivate(vcpu); vcpu->arch.cr0 &= ~X86_CR0_TS; vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0); trace_kvm_cr_write(0, vcpu->arch.cr0); vmx_fpu_activate(vcpu); skip_emulated_instruction(vcpu); return 1; case 1: /*mov from cr*/ switch (cr) { case 3: kvm_register_write(vcpu, reg, vcpu->arch.cr3); trace_kvm_cr_read(cr, vcpu->arch.cr3); skip_emulated_instruction(vcpu); return 1; case 8: val = kvm_get_cr8(vcpu); kvm_register_write(vcpu, reg, val); trace_kvm_cr_read(cr, val); skip_emulated_instruction(vcpu); return 1; } break; case 3: /* lmsw */ val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f; trace_kvm_cr_write(0, (vcpu->arch.cr0 & ~0xful) | val); kvm_lmsw(vcpu, val); skip_emulated_instruction(vcpu); return 1; default: break; } vcpu->run->exit_reason = 0; pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n", (int)(exit_qualification >> 4) & 3, cr); return 0; } static int handle_dr(struct kvm_vcpu *vcpu) { unsigned long exit_qualification; unsigned long val; int dr, reg; if (!kvm_require_cpl(vcpu, 0)) return 1; dr = vmcs_readl(GUEST_DR7); if (dr & DR7_GD) { /* * As the vm-exit takes precedence over the debug trap, we * need to emulate the latter, either for the host or the * guest debugging itself. */ if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { vcpu->run->debug.arch.dr6 = vcpu->arch.dr6; vcpu->run->debug.arch.dr7 = dr; vcpu->run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + vmcs_readl(GUEST_RIP); vcpu->run->debug.arch.exception = DB_VECTOR; vcpu->run->exit_reason = KVM_EXIT_DEBUG; return 0; } else { vcpu->arch.dr7 &= ~DR7_GD; vcpu->arch.dr6 |= DR6_BD; vmcs_writel(GUEST_DR7, vcpu->arch.dr7); kvm_queue_exception(vcpu, DB_VECTOR); return 1; } } exit_qualification = vmcs_readl(EXIT_QUALIFICATION); dr = exit_qualification & DEBUG_REG_ACCESS_NUM; reg = DEBUG_REG_ACCESS_REG(exit_qualification); if (exit_qualification & TYPE_MOV_FROM_DR) { switch (dr) { case 0 ... 3: val = vcpu->arch.db[dr]; break; case 6: val = vcpu->arch.dr6; break; case 7: val = vcpu->arch.dr7; break; default: val = 0; } kvm_register_write(vcpu, reg, val); } else { val = vcpu->arch.regs[reg]; switch (dr) { case 0 ... 3: vcpu->arch.db[dr] = val; if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) vcpu->arch.eff_db[dr] = val; break; case 4 ... 5: if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) kvm_queue_exception(vcpu, UD_VECTOR); break; case 6: if (val & 0xffffffff00000000ULL) { kvm_queue_exception(vcpu, GP_VECTOR); break; } vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1; break; case 7: if (val & 0xffffffff00000000ULL) { kvm_queue_exception(vcpu, GP_VECTOR); break; } vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { vmcs_writel(GUEST_DR7, vcpu->arch.dr7); vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK); } break; } } skip_emulated_instruction(vcpu); return 1; } static int handle_cpuid(struct kvm_vcpu *vcpu) { kvm_emulate_cpuid(vcpu); return 1; } static int handle_rdmsr(struct kvm_vcpu *vcpu) { u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; u64 data; if (vmx_get_msr(vcpu, ecx, &data)) { kvm_inject_gp(vcpu, 0); return 1; } trace_kvm_msr_read(ecx, data); /* FIXME: handling of bits 32:63 of rax, rdx */ vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u; vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u; skip_emulated_instruction(vcpu); return 1; } static int handle_wrmsr(struct kvm_vcpu *vcpu) { u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u) | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32); trace_kvm_msr_write(ecx, data); if (vmx_set_msr(vcpu, ecx, data) != 0) { kvm_inject_gp(vcpu, 0); return 1; } skip_emulated_instruction(vcpu); return 1; } static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu) { return 1; } static int handle_interrupt_window(struct kvm_vcpu *vcpu) { u32 cpu_based_vm_exec_control; /* clear pending irq */ cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); ++vcpu->stat.irq_window_exits; /* * If the user space waits to inject interrupts, exit as soon as * possible */ if (!irqchip_in_kernel(vcpu->kvm) && vcpu->run->request_interrupt_window && !kvm_cpu_has_interrupt(vcpu)) { vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; return 0; } return 1; } static int handle_halt(struct kvm_vcpu *vcpu) { skip_emulated_instruction(vcpu); return kvm_emulate_halt(vcpu); } static int handle_vmcall(struct kvm_vcpu *vcpu) { skip_emulated_instruction(vcpu); kvm_emulate_hypercall(vcpu); return 1; } static int handle_vmx_insn(struct kvm_vcpu *vcpu) { kvm_queue_exception(vcpu, UD_VECTOR); return 1; } static int handle_invlpg(struct kvm_vcpu *vcpu) { unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); kvm_mmu_invlpg(vcpu, exit_qualification); skip_emulated_instruction(vcpu); return 1; } static int handle_wbinvd(struct kvm_vcpu *vcpu) { skip_emulated_instruction(vcpu); /* TODO: Add support for VT-d/pass-through device */ return 1; } static int handle_apic_access(struct kvm_vcpu *vcpu) { unsigned long exit_qualification; enum emulation_result er; unsigned long offset; exit_qualification = vmcs_readl(EXIT_QUALIFICATION); offset = exit_qualification & 0xffful; er = emulate_instruction(vcpu, 0, 0, 0); if (er != EMULATE_DONE) { printk(KERN_ERR "Fail to handle apic access vmexit! Offset is 0x%lx\n", offset); return -ENOEXEC; } return 1; } static int handle_task_switch(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); unsigned long exit_qualification; u16 tss_selector; int reason, type, idt_v; idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK); type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK); exit_qualification = vmcs_readl(EXIT_QUALIFICATION); reason = (u32)exit_qualification >> 30; if (reason == TASK_SWITCH_GATE && idt_v) { switch (type) { case INTR_TYPE_NMI_INTR: vcpu->arch.nmi_injected = false; if (cpu_has_virtual_nmis()) vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI); break; case INTR_TYPE_EXT_INTR: case INTR_TYPE_SOFT_INTR: kvm_clear_interrupt_queue(vcpu); break; case INTR_TYPE_HARD_EXCEPTION: case INTR_TYPE_SOFT_EXCEPTION: kvm_clear_exception_queue(vcpu); break; default: break; } } tss_selector = exit_qualification; if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION && type != INTR_TYPE_EXT_INTR && type != INTR_TYPE_NMI_INTR)) skip_emulated_instruction(vcpu); if (!kvm_task_switch(vcpu, tss_selector, reason)) return 0; /* clear all local breakpoint enable flags */ vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55); /* * TODO: What about debug traps on tss switch? * Are we supposed to inject them and update dr6? */ return 1; } static int handle_ept_violation(struct kvm_vcpu *vcpu) { unsigned long exit_qualification; gpa_t gpa; int gla_validity; exit_qualification = vmcs_readl(EXIT_QUALIFICATION); if (exit_qualification & (1 << 6)) { printk(KERN_ERR "EPT: GPA exceeds GAW!\n"); return -EINVAL; } gla_validity = (exit_qualification >> 7) & 0x3; if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) { printk(KERN_ERR "EPT: Handling EPT violation failed!\n"); printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n", (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS), vmcs_readl(GUEST_LINEAR_ADDRESS)); printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n", (long unsigned int)exit_qualification); vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION; return 0; } gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); trace_kvm_page_fault(gpa, exit_qualification); return kvm_mmu_page_fault(vcpu, gpa & PAGE_MASK, 0); } static u64 ept_rsvd_mask(u64 spte, int level) { int i; u64 mask = 0; for (i = 51; i > boot_cpu_data.x86_phys_bits; i--) mask |= (1ULL << i); if (level > 2) /* bits 7:3 reserved */ mask |= 0xf8; else if (level == 2) { if (spte & (1ULL << 7)) /* 2MB ref, bits 20:12 reserved */ mask |= 0x1ff000; else /* bits 6:3 reserved */ mask |= 0x78; } return mask; } static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte, int level) { printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level); /* 010b (write-only) */ WARN_ON((spte & 0x7) == 0x2); /* 110b (write/execute) */ WARN_ON((spte & 0x7) == 0x6); /* 100b (execute-only) and value not supported by logical processor */ if (!cpu_has_vmx_ept_execute_only()) WARN_ON((spte & 0x7) == 0x4); /* not 000b */ if ((spte & 0x7)) { u64 rsvd_bits = spte & ept_rsvd_mask(spte, level); if (rsvd_bits != 0) { printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n", __func__, rsvd_bits); WARN_ON(1); } if (level == 1 || (level == 2 && (spte & (1ULL << 7)))) { u64 ept_mem_type = (spte & 0x38) >> 3; if (ept_mem_type == 2 || ept_mem_type == 3 || ept_mem_type == 7) { printk(KERN_ERR "%s: ept_mem_type=0x%llx\n", __func__, ept_mem_type); WARN_ON(1); } } } } static int handle_ept_misconfig(struct kvm_vcpu *vcpu) { u64 sptes[4]; int nr_sptes, i; gpa_t gpa; gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); printk(KERN_ERR "EPT: Misconfiguration.\n"); printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa); nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes); for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i) ept_misconfig_inspect_spte(vcpu, sptes[i-1], i); vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG; return 0; } static int handle_nmi_window(struct kvm_vcpu *vcpu) { u32 cpu_based_vm_exec_control; /* clear pending NMI */ cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); ++vcpu->stat.nmi_window_exits; return 1; } static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); enum emulation_result err = EMULATE_DONE; int ret = 1; while (!guest_state_valid(vcpu)) { err = emulate_instruction(vcpu, 0, 0, 0); if (err == EMULATE_DO_MMIO) { ret = 0; goto out; } if (err != EMULATE_DONE) { kvm_report_emulation_failure(vcpu, "emulation failure"); vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; vcpu->run->internal.ndata = 0; ret = 0; goto out; } if (signal_pending(current)) goto out; if (need_resched()) schedule(); } vmx->emulation_required = 0; out: return ret; } /* * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE * exiting, so only get here on cpu with PAUSE-Loop-Exiting. */ static int handle_pause(struct kvm_vcpu *vcpu) { skip_emulated_instruction(vcpu); kvm_vcpu_on_spin(vcpu); return 1; } static int handle_invalid_op(struct kvm_vcpu *vcpu) { kvm_queue_exception(vcpu, UD_VECTOR); return 1; } /* * 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) = { [EXIT_REASON_EXCEPTION_NMI] = handle_exception, [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt, [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault, [EXIT_REASON_NMI_WINDOW] = handle_nmi_window, [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_INVLPG] = handle_invlpg, [EXIT_REASON_VMCALL] = handle_vmcall, [EXIT_REASON_VMCLEAR] = handle_vmx_insn, [EXIT_REASON_VMLAUNCH] = handle_vmx_insn, [EXIT_REASON_VMPTRLD] = handle_vmx_insn, [EXIT_REASON_VMPTRST] = handle_vmx_insn, [EXIT_REASON_VMREAD] = handle_vmx_insn, [EXIT_REASON_VMRESUME] = handle_vmx_insn, [EXIT_REASON_VMWRITE] = handle_vmx_insn, [EXIT_REASON_VMOFF] = handle_vmx_insn, [EXIT_REASON_VMON] = handle_vmx_insn, [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold, [EXIT_REASON_APIC_ACCESS] = handle_apic_access, [EXIT_REASON_WBINVD] = handle_wbinvd, [EXIT_REASON_TASK_SWITCH] = handle_task_switch, [EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check, [EXIT_REASON_EPT_VIOLATION] = handle_ept_violation, [EXIT_REASON_EPT_MISCONFIG] = handle_ept_misconfig, [EXIT_REASON_PAUSE_INSTRUCTION] = handle_pause, [EXIT_REASON_MWAIT_INSTRUCTION] = handle_invalid_op, [EXIT_REASON_MONITOR_INSTRUCTION] = handle_invalid_op, }; static const int kvm_vmx_max_exit_handlers = ARRAY_SIZE(kvm_vmx_exit_handlers); /* * The guest has exited. See if we can fix it or if we need userspace * assistance. */ static int vmx_handle_exit(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); u32 exit_reason = vmx->exit_reason; u32 vectoring_info = vmx->idt_vectoring_info; trace_kvm_exit(exit_reason, kvm_rip_read(vcpu)); /* If guest state is invalid, start emulating */ if (vmx->emulation_required && emulate_invalid_guest_state) return handle_invalid_guest_state(vcpu); /* Access CR3 don't cause VMExit in paging mode, so we need * to sync with guest real CR3. */ if (enable_ept && is_paging(vcpu)) vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); if (unlikely(vmx->fail)) { vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; vcpu->run->fail_entry.hardware_entry_failure_reason = vmcs_read32(VM_INSTRUCTION_ERROR); return 0; } if ((vectoring_info & VECTORING_INFO_VALID_MASK) && (exit_reason != EXIT_REASON_EXCEPTION_NMI && exit_reason != EXIT_REASON_EPT_VIOLATION && exit_reason != EXIT_REASON_TASK_SWITCH)) printk(KERN_WARNING "%s: unexpected, valid vectoring info " "(0x%x) and exit reason is 0x%x\n", __func__, vectoring_info, exit_reason); if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) { if (vmx_interrupt_allowed(vcpu)) { vmx->soft_vnmi_blocked = 0; } else if (vmx->vnmi_blocked_time > 1000000000LL && vcpu->arch.nmi_pending) { /* * This CPU don't support us in finding the end of an * NMI-blocked window if the guest runs with IRQs * disabled. So we pull the trigger after 1 s of * futile waiting, but inform the user about this. */ printk(KERN_WARNING "%s: Breaking out of NMI-blocked " "state on VCPU %d after 1 s timeout\n", __func__, vcpu->vcpu_id); vmx->soft_vnmi_blocked = 0; } } if (exit_reason < kvm_vmx_max_exit_handlers && kvm_vmx_exit_handlers[exit_reason]) return kvm_vmx_exit_handlers[exit_reason](vcpu); else { vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; vcpu->run->hw.hardware_exit_reason = exit_reason; } return 0; } static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr) { if (irr == -1 || tpr < irr) { vmcs_write32(TPR_THRESHOLD, 0); return; } vmcs_write32(TPR_THRESHOLD, irr); } static void vmx_complete_interrupts(struct vcpu_vmx *vmx) { u32 exit_intr_info; u32 idt_vectoring_info = vmx->idt_vectoring_info; bool unblock_nmi; u8 vector; int type; bool idtv_info_valid; exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); vmx->exit_reason = vmcs_read32(VM_EXIT_REASON); /* Handle machine checks before interrupts are enabled */ if ((vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY) || (vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI && is_machine_check(exit_intr_info))) kvm_machine_check(); /* We need to handle NMIs before interrupts are enabled */ if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR && (exit_intr_info & INTR_INFO_VALID_MASK)) asm("int $2"); idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK; if (cpu_has_virtual_nmis()) { unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0; vector = exit_intr_info & INTR_INFO_VECTOR_MASK; /* * SDM 3: 27.7.1.2 (September 2008) * Re-set bit "block by NMI" before VM entry if vmexit caused by * a guest IRET fault. * SDM 3: 23.2.2 (September 2008) * Bit 12 is undefined in any of the following cases: * If the VM exit sets the valid bit in the IDT-vectoring * information field. * If the VM exit is due to a double fault. */ if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi && vector != DF_VECTOR && !idtv_info_valid) vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI); } else if (unlikely(vmx->soft_vnmi_blocked)) vmx->vnmi_blocked_time += ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time)); vmx->vcpu.arch.nmi_injected = false; kvm_clear_exception_queue(&vmx->vcpu); kvm_clear_interrupt_queue(&vmx->vcpu); if (!idtv_info_valid) return; vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK; type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK; switch (type) { case INTR_TYPE_NMI_INTR: vmx->vcpu.arch.nmi_injected = true; /* * SDM 3: 27.7.1.2 (September 2008) * Clear bit "block by NMI" before VM entry if a NMI * delivery faulted. */ vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI); break; case INTR_TYPE_SOFT_EXCEPTION: vmx->vcpu.arch.event_exit_inst_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); /* fall through */ case INTR_TYPE_HARD_EXCEPTION: if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) { u32 err = vmcs_read32(IDT_VECTORING_ERROR_CODE); kvm_queue_exception_e(&vmx->vcpu, vector, err); } else kvm_queue_exception(&vmx->vcpu, vector); break; case INTR_TYPE_SOFT_INTR: vmx->vcpu.arch.event_exit_inst_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); /* fall through */ case INTR_TYPE_EXT_INTR: kvm_queue_interrupt(&vmx->vcpu, vector, type == INTR_TYPE_SOFT_INTR); break; default: break; } } /* * Failure to inject an interrupt should give us the information * in IDT_VECTORING_INFO_FIELD. However, if the failure occurs * when fetching the interrupt redirection bitmap in the real-mode * tss, this doesn't happen. So we do it ourselves. */ static void fixup_rmode_irq(struct vcpu_vmx *vmx) { vmx->rmode.irq.pending = 0; if (kvm_rip_read(&vmx->vcpu) + 1 != vmx->rmode.irq.rip) return; kvm_rip_write(&vmx->vcpu, vmx->rmode.irq.rip); if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) { vmx->idt_vectoring_info &= ~VECTORING_INFO_TYPE_MASK; vmx->idt_vectoring_info |= INTR_TYPE_EXT_INTR; return; } vmx->idt_vectoring_info = VECTORING_INFO_VALID_MASK | INTR_TYPE_EXT_INTR | vmx->rmode.irq.vector; } #ifdef CONFIG_X86_64 #define R "r" #define Q "q" #else #define R "e" #define Q "l" #endif static void vmx_vcpu_run(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); /* Record the guest's net vcpu time for enforced NMI injections. */ if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) vmx->entry_time = ktime_get(); /* Don't enter VMX if guest state is invalid, let the exit handler start emulation until we arrive back to a valid state */ if (vmx->emulation_required && emulate_invalid_guest_state) return; if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty)) vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]); if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty)) vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]); /* When single-stepping over STI and MOV SS, we must clear the * corresponding interruptibility bits in the guest state. Otherwise * vmentry fails as it then expects bit 14 (BS) in pending debug * exceptions being set, but that's not correct for the guest debugging * case. */ if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) vmx_set_interrupt_shadow(vcpu, 0); /* * Loading guest fpu may have cleared host cr0.ts */ vmcs_writel(HOST_CR0, read_cr0()); if (vcpu->arch.switch_db_regs) set_debugreg(vcpu->arch.dr6, 6); asm( /* Store host registers */ "push %%"R"dx; push %%"R"bp;" "push %%"R"cx \n\t" "cmp %%"R"sp, %c[host_rsp](%0) \n\t" "je 1f \n\t" "mov %%"R"sp, %c[host_rsp](%0) \n\t" __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t" "1: \n\t" /* Reload cr2 if changed */ "mov %c[cr2](%0), %%"R"ax \n\t" "mov %%cr2, %%"R"dx \n\t" "cmp %%"R"ax, %%"R"dx \n\t" "je 2f \n\t" "mov %%"R"ax, %%cr2 \n\t" "2: \n\t" /* Check if vmlaunch of vmresume is needed */ "cmpl $0, %c[launched](%0) \n\t" /* Load guest registers. Don't clobber flags. */ "mov %c[rax](%0), %%"R"ax \n\t" "mov %c[rbx](%0), %%"R"bx \n\t" "mov %c[rdx](%0), %%"R"dx \n\t" "mov %c[rsi](%0), %%"R"si \n\t" "mov %c[rdi](%0), %%"R"di \n\t" "mov %c[rbp](%0), %%"R"bp \n\t" #ifdef CONFIG_X86_64 "mov %c[r8](%0), %%r8 \n\t" "mov %c[r9](%0), %%r9 \n\t" "mov %c[r10](%0), %%r10 \n\t" "mov %c[r11](%0), %%r11 \n\t" "mov %c[r12](%0), %%r12 \n\t" "mov %c[r13](%0), %%r13 \n\t" "mov %c[r14](%0), %%r14 \n\t" "mov %c[r15](%0), %%r15 \n\t" #endif "mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */ /* Enter guest mode */ "jne .Llaunched \n\t" __ex(ASM_VMX_VMLAUNCH) "\n\t" "jmp .Lkvm_vmx_return \n\t" ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t" ".Lkvm_vmx_return: " /* Save guest registers, load host registers, keep flags */ "xchg %0, (%%"R"sp) \n\t" "mov %%"R"ax, %c[rax](%0) \n\t" "mov %%"R"bx, %c[rbx](%0) \n\t" "push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t" "mov %%"R"dx, %c[rdx](%0) \n\t" "mov %%"R"si, %c[rsi](%0) \n\t" "mov %%"R"di, %c[rdi](%0) \n\t" "mov %%"R"bp, %c[rbp](%0) \n\t" #ifdef CONFIG_X86_64 "mov %%r8, %c[r8](%0) \n\t" "mov %%r9, %c[r9](%0) \n\t" "mov %%r10, %c[r10](%0) \n\t" "mov %%r11, %c[r11](%0) \n\t" "mov %%r12, %c[r12](%0) \n\t" "mov %%r13, %c[r13](%0) \n\t" "mov %%r14, %c[r14](%0) \n\t" "mov %%r15, %c[r15](%0) \n\t" #endif "mov %%cr2, %%"R"ax \n\t" "mov %%"R"ax, %c[cr2](%0) \n\t" "pop %%"R"bp; pop %%"R"bp; pop %%"R"dx \n\t" "setbe %c[fail](%0) \n\t" : : "c"(vmx), "d"((unsigned long)HOST_RSP), [launched]"i"(offsetof(struct vcpu_vmx, launched)), [fail]"i"(offsetof(struct vcpu_vmx, fail)), [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)), [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])), [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])), [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])), [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])), [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])), [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])), [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])), #ifdef CONFIG_X86_64 [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])), [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])), [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])), [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])), [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])), [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])), [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])), [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])), #endif [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)) : "cc", "memory" , R"bx", R"di", R"si" #ifdef CONFIG_X86_64 , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15" #endif ); vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP) | (1 << VCPU_EXREG_PDPTR)); vcpu->arch.regs_dirty = 0; if (vcpu->arch.switch_db_regs) get_debugreg(vcpu->arch.dr6, 6); vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); if (vmx->rmode.irq.pending) fixup_rmode_irq(vmx); asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS)); vmx->launched = 1; vmx_complete_interrupts(vmx); } #undef R #undef Q static void vmx_free_vmcs(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); if (vmx->vmcs) { vcpu_clear(vmx); free_vmcs(vmx->vmcs); vmx->vmcs = NULL; } } static void vmx_free_vcpu(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); spin_lock(&vmx_vpid_lock); if (vmx->vpid != 0) __clear_bit(vmx->vpid, vmx_vpid_bitmap); spin_unlock(&vmx_vpid_lock); vmx_free_vmcs(vcpu); kfree(vmx->guest_msrs); kvm_vcpu_uninit(vcpu); kmem_cache_free(kvm_vcpu_cache, vmx); } static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) { int err; struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); int cpu; if (!vmx) return ERR_PTR(-ENOMEM); allocate_vpid(vmx); err = kvm_vcpu_init(&vmx->vcpu, kvm, id); if (err) goto free_vcpu; vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!vmx->guest_msrs) { err = -ENOMEM; goto uninit_vcpu; } vmx->vmcs = alloc_vmcs(); if (!vmx->vmcs) goto free_msrs; vmcs_clear(vmx->vmcs); cpu = get_cpu(); vmx_vcpu_load(&vmx->vcpu, cpu); err = vmx_vcpu_setup(vmx); vmx_vcpu_put(&vmx->vcpu); put_cpu(); if (err) goto free_vmcs; if (vm_need_virtualize_apic_accesses(kvm)) if (alloc_apic_access_page(kvm) != 0) goto free_vmcs; if (enable_ept) { if (!kvm->arch.ept_identity_map_addr) kvm->arch.ept_identity_map_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR; if (alloc_identity_pagetable(kvm) != 0) goto free_vmcs; } return &vmx->vcpu; free_vmcs: free_vmcs(vmx->vmcs); free_msrs: kfree(vmx->guest_msrs); uninit_vcpu: kvm_vcpu_uninit(&vmx->vcpu); free_vcpu: kmem_cache_free(kvm_vcpu_cache, vmx); return ERR_PTR(err); } static void __init vmx_check_processor_compat(void *rtn) { struct vmcs_config vmcs_conf; *(int *)rtn = 0; if (setup_vmcs_config(&vmcs_conf) < 0) *(int *)rtn = -EIO; if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) { printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n", smp_processor_id()); *(int *)rtn = -EIO; } } static int get_ept_level(void) { return VMX_EPT_DEFAULT_GAW + 1; } static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) { u64 ret; /* For VT-d and EPT combination * 1. MMIO: always map as UC * 2. EPT with VT-d: * a. VT-d without snooping control feature: can't guarantee the * result, try to trust guest. * b. VT-d with snooping control feature: snooping control feature of * VT-d engine can guarantee the cache correctness. Just set it * to WB to keep consistent with host. So the same as item 3. * 3. EPT without VT-d: always map as WB and set IGMT=1 to keep * consistent with host MTRR */ if (is_mmio) ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT; else if (vcpu->kvm->arch.iommu_domain && !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)) ret = kvm_get_guest_memory_type(vcpu, gfn) << VMX_EPT_MT_EPTE_SHIFT; else ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT) | VMX_EPT_IGMT_BIT; return ret; } #define _ER(x) { EXIT_REASON_##x, #x } static const struct trace_print_flags vmx_exit_reasons_str[] = { _ER(EXCEPTION_NMI), _ER(EXTERNAL_INTERRUPT), _ER(TRIPLE_FAULT), _ER(PENDING_INTERRUPT), _ER(NMI_WINDOW), _ER(TASK_SWITCH), _ER(CPUID), _ER(HLT), _ER(INVLPG), _ER(RDPMC), _ER(RDTSC), _ER(VMCALL), _ER(VMCLEAR), _ER(VMLAUNCH), _ER(VMPTRLD), _ER(VMPTRST), _ER(VMREAD), _ER(VMRESUME), _ER(VMWRITE), _ER(VMOFF), _ER(VMON), _ER(CR_ACCESS), _ER(DR_ACCESS), _ER(IO_INSTRUCTION), _ER(MSR_READ), _ER(MSR_WRITE), _ER(MWAIT_INSTRUCTION), _ER(MONITOR_INSTRUCTION), _ER(PAUSE_INSTRUCTION), _ER(MCE_DURING_VMENTRY), _ER(TPR_BELOW_THRESHOLD), _ER(APIC_ACCESS), _ER(EPT_VIOLATION), _ER(EPT_MISCONFIG), _ER(WBINVD), { -1, NULL } }; #undef _ER static int vmx_get_lpage_level(void) { if (enable_ept && !cpu_has_vmx_ept_1g_page()) return PT_DIRECTORY_LEVEL; else /* For shadow and EPT supported 1GB page */ return PT_PDPE_LEVEL; } static inline u32 bit(int bitno) { return 1 << (bitno & 31); } static void vmx_cpuid_update(struct kvm_vcpu *vcpu) { struct kvm_cpuid_entry2 *best; struct vcpu_vmx *vmx = to_vmx(vcpu); u32 exec_control; vmx->rdtscp_enabled = false; if (vmx_rdtscp_supported()) { exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); if (exec_control & SECONDARY_EXEC_RDTSCP) { best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); if (best && (best->edx & bit(X86_FEATURE_RDTSCP))) vmx->rdtscp_enabled = true; else { exec_control &= ~SECONDARY_EXEC_RDTSCP; vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control); } } } } static struct kvm_x86_ops vmx_x86_ops = { .cpu_has_kvm_support = cpu_has_kvm_support, .disabled_by_bios = vmx_disabled_by_bios, .hardware_setup = hardware_setup, .hardware_unsetup = hardware_unsetup, .check_processor_compatibility = vmx_check_processor_compat, .hardware_enable = hardware_enable, .hardware_disable = hardware_disable, .cpu_has_accelerated_tpr = report_flexpriority, .vcpu_create = vmx_create_vcpu, .vcpu_free = vmx_free_vcpu, .vcpu_reset = vmx_vcpu_reset, .prepare_guest_switch = vmx_save_host_state, .vcpu_load = vmx_vcpu_load, .vcpu_put = vmx_vcpu_put, .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_cpl = vmx_get_cpl, .get_cs_db_l_bits = vmx_get_cs_db_l_bits, .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits, .set_cr0 = vmx_set_cr0, .set_cr3 = vmx_set_cr3, .set_cr4 = vmx_set_cr4, .set_efer = vmx_set_efer, .get_idt = vmx_get_idt, .set_idt = vmx_set_idt, .get_gdt = vmx_get_gdt, .set_gdt = vmx_set_gdt, .cache_reg = vmx_cache_reg, .get_rflags = vmx_get_rflags, .set_rflags = vmx_set_rflags, .tlb_flush = vmx_flush_tlb, .run = vmx_vcpu_run, .handle_exit = vmx_handle_exit, .skip_emulated_instruction = skip_emulated_instruction, .set_interrupt_shadow = vmx_set_interrupt_shadow, .get_interrupt_shadow = vmx_get_interrupt_shadow, .patch_hypercall = vmx_patch_hypercall, .set_irq = vmx_inject_irq, .set_nmi = vmx_inject_nmi, .queue_exception = vmx_queue_exception, .interrupt_allowed = vmx_interrupt_allowed, .nmi_allowed = vmx_nmi_allowed, .get_nmi_mask = vmx_get_nmi_mask, .set_nmi_mask = vmx_set_nmi_mask, .enable_nmi_window = enable_nmi_window, .enable_irq_window = enable_irq_window, .update_cr8_intercept = update_cr8_intercept, .set_tss_addr = vmx_set_tss_addr, .get_tdp_level = get_ept_level, .get_mt_mask = vmx_get_mt_mask, .exit_reasons_str = vmx_exit_reasons_str, .get_lpage_level = vmx_get_lpage_level, .cpuid_update = vmx_cpuid_update, .rdtscp_supported = vmx_rdtscp_supported, }; static int __init vmx_init(void) { int r, i; rdmsrl_safe(MSR_EFER, &host_efer); for (i = 0; i < NR_VMX_MSR; ++i) kvm_define_shared_msr(i, vmx_msr_index[i]); vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL); if (!vmx_io_bitmap_a) return -ENOMEM; vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL); if (!vmx_io_bitmap_b) { r = -ENOMEM; goto out; } vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL); if (!vmx_msr_bitmap_legacy) { r = -ENOMEM; goto out1; } vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL); if (!vmx_msr_bitmap_longmode) { r = -ENOMEM; goto out2; } /* * Allow direct access to the PC debug port (it is often used for I/O * delays, but the vmexits simply slow things down). */ memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE); clear_bit(0x80, vmx_io_bitmap_a); memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE); memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE); memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE); set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */ r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE); if (r) goto out3; vmx_disable_intercept_for_msr(MSR_FS_BASE, false); vmx_disable_intercept_for_msr(MSR_GS_BASE, false); vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true); vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false); vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false); vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false); if (enable_ept) { bypass_guest_pf = 0; kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK | VMX_EPT_WRITABLE_MASK); kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull, VMX_EPT_EXECUTABLE_MASK); kvm_enable_tdp(); } else kvm_disable_tdp(); if (bypass_guest_pf) kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull); return 0; out3: free_page((unsigned long)vmx_msr_bitmap_longmode); out2: free_page((unsigned long)vmx_msr_bitmap_legacy); out1: free_page((unsigned long)vmx_io_bitmap_b); out: free_page((unsigned long)vmx_io_bitmap_a); return r; } static void __exit vmx_exit(void) { free_page((unsigned long)vmx_msr_bitmap_legacy); free_page((unsigned long)vmx_msr_bitmap_longmode); free_page((unsigned long)vmx_io_bitmap_b); free_page((unsigned long)vmx_io_bitmap_a); kvm_exit(); } module_init(vmx_init) module_exit(vmx_exit)