| /* |
| * Kernel-based Virtual Machine driver for Linux |
| * |
| * AMD SVM support |
| * |
| * Copyright (C) 2006 Qumranet, Inc. |
| * |
| * Authors: |
| * Yaniv Kamay <yaniv@qumranet.com> |
| * Avi Kivity <avi@qumranet.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| * |
| */ |
| #include <linux/kvm_host.h> |
| |
| #include "kvm_svm.h" |
| #include "irq.h" |
| #include "mmu.h" |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/vmalloc.h> |
| #include <linux/highmem.h> |
| #include <linux/sched.h> |
| |
| #include <asm/desc.h> |
| |
| MODULE_AUTHOR("Qumranet"); |
| MODULE_LICENSE("GPL"); |
| |
| #define IOPM_ALLOC_ORDER 2 |
| #define MSRPM_ALLOC_ORDER 1 |
| |
| #define DB_VECTOR 1 |
| #define UD_VECTOR 6 |
| #define GP_VECTOR 13 |
| |
| #define DR7_GD_MASK (1 << 13) |
| #define DR6_BD_MASK (1 << 13) |
| |
| #define SEG_TYPE_LDT 2 |
| #define SEG_TYPE_BUSY_TSS16 3 |
| |
| #define SVM_FEATURE_NPT (1 << 0) |
| #define SVM_FEATURE_LBRV (1 << 1) |
| #define SVM_DEATURE_SVML (1 << 2) |
| |
| static bool npt_enabled = false; |
| static int npt = 1; |
| |
| module_param(npt, int, S_IRUGO); |
| |
| static void kvm_reput_irq(struct vcpu_svm *svm); |
| |
| static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu) |
| { |
| return container_of(vcpu, struct vcpu_svm, vcpu); |
| } |
| |
| unsigned long iopm_base; |
| unsigned long msrpm_base; |
| |
| struct kvm_ldttss_desc { |
| u16 limit0; |
| u16 base0; |
| unsigned base1 : 8, type : 5, dpl : 2, p : 1; |
| unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8; |
| u32 base3; |
| u32 zero1; |
| } __attribute__((packed)); |
| |
| struct svm_cpu_data { |
| int cpu; |
| |
| u64 asid_generation; |
| u32 max_asid; |
| u32 next_asid; |
| struct kvm_ldttss_desc *tss_desc; |
| |
| struct page *save_area; |
| }; |
| |
| static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data); |
| static uint32_t svm_features; |
| |
| struct svm_init_data { |
| int cpu; |
| int r; |
| }; |
| |
| static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000}; |
| |
| #define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges) |
| #define MSRS_RANGE_SIZE 2048 |
| #define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2) |
| |
| #define MAX_INST_SIZE 15 |
| |
| static inline u32 svm_has(u32 feat) |
| { |
| return svm_features & feat; |
| } |
| |
| static inline u8 pop_irq(struct kvm_vcpu *vcpu) |
| { |
| int word_index = __ffs(vcpu->arch.irq_summary); |
| int bit_index = __ffs(vcpu->arch.irq_pending[word_index]); |
| int irq = word_index * BITS_PER_LONG + bit_index; |
| |
| clear_bit(bit_index, &vcpu->arch.irq_pending[word_index]); |
| if (!vcpu->arch.irq_pending[word_index]) |
| clear_bit(word_index, &vcpu->arch.irq_summary); |
| return irq; |
| } |
| |
| static inline void push_irq(struct kvm_vcpu *vcpu, u8 irq) |
| { |
| set_bit(irq, vcpu->arch.irq_pending); |
| set_bit(irq / BITS_PER_LONG, &vcpu->arch.irq_summary); |
| } |
| |
| static inline void clgi(void) |
| { |
| asm volatile (SVM_CLGI); |
| } |
| |
| static inline void stgi(void) |
| { |
| asm volatile (SVM_STGI); |
| } |
| |
| static inline void invlpga(unsigned long addr, u32 asid) |
| { |
| asm volatile (SVM_INVLPGA :: "a"(addr), "c"(asid)); |
| } |
| |
| static inline unsigned long kvm_read_cr2(void) |
| { |
| unsigned long cr2; |
| |
| asm volatile ("mov %%cr2, %0" : "=r" (cr2)); |
| return cr2; |
| } |
| |
| static inline void kvm_write_cr2(unsigned long val) |
| { |
| asm volatile ("mov %0, %%cr2" :: "r" (val)); |
| } |
| |
| static inline unsigned long read_dr6(void) |
| { |
| unsigned long dr6; |
| |
| asm volatile ("mov %%dr6, %0" : "=r" (dr6)); |
| return dr6; |
| } |
| |
| static inline void write_dr6(unsigned long val) |
| { |
| asm volatile ("mov %0, %%dr6" :: "r" (val)); |
| } |
| |
| static inline unsigned long read_dr7(void) |
| { |
| unsigned long dr7; |
| |
| asm volatile ("mov %%dr7, %0" : "=r" (dr7)); |
| return dr7; |
| } |
| |
| static inline void write_dr7(unsigned long val) |
| { |
| asm volatile ("mov %0, %%dr7" :: "r" (val)); |
| } |
| |
| static inline void force_new_asid(struct kvm_vcpu *vcpu) |
| { |
| to_svm(vcpu)->asid_generation--; |
| } |
| |
| static inline void flush_guest_tlb(struct kvm_vcpu *vcpu) |
| { |
| force_new_asid(vcpu); |
| } |
| |
| static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer) |
| { |
| if (!(efer & EFER_LMA)) |
| efer &= ~EFER_LME; |
| |
| to_svm(vcpu)->vmcb->save.efer = efer | MSR_EFER_SVME_MASK; |
| vcpu->arch.shadow_efer = efer; |
| } |
| |
| static void svm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr, |
| bool has_error_code, u32 error_code) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm->vmcb->control.event_inj = nr |
| | SVM_EVTINJ_VALID |
| | (has_error_code ? SVM_EVTINJ_VALID_ERR : 0) |
| | SVM_EVTINJ_TYPE_EXEPT; |
| svm->vmcb->control.event_inj_err = error_code; |
| } |
| |
| static bool svm_exception_injected(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| return !(svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID); |
| } |
| |
| static int is_external_interrupt(u32 info) |
| { |
| info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID; |
| return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR); |
| } |
| |
| static void skip_emulated_instruction(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| if (!svm->next_rip) { |
| printk(KERN_DEBUG "%s: NOP\n", __FUNCTION__); |
| return; |
| } |
| if (svm->next_rip - svm->vmcb->save.rip > MAX_INST_SIZE) |
| printk(KERN_ERR "%s: ip 0x%llx next 0x%llx\n", |
| __FUNCTION__, |
| svm->vmcb->save.rip, |
| svm->next_rip); |
| |
| vcpu->arch.rip = svm->vmcb->save.rip = svm->next_rip; |
| svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK; |
| |
| vcpu->arch.interrupt_window_open = 1; |
| } |
| |
| static int has_svm(void) |
| { |
| uint32_t eax, ebx, ecx, edx; |
| |
| if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) { |
| printk(KERN_INFO "has_svm: not amd\n"); |
| return 0; |
| } |
| |
| cpuid(0x80000000, &eax, &ebx, &ecx, &edx); |
| if (eax < SVM_CPUID_FUNC) { |
| printk(KERN_INFO "has_svm: can't execute cpuid_8000000a\n"); |
| return 0; |
| } |
| |
| cpuid(0x80000001, &eax, &ebx, &ecx, &edx); |
| if (!(ecx & (1 << SVM_CPUID_FEATURE_SHIFT))) { |
| printk(KERN_DEBUG "has_svm: svm not available\n"); |
| return 0; |
| } |
| return 1; |
| } |
| |
| static void svm_hardware_disable(void *garbage) |
| { |
| struct svm_cpu_data *svm_data |
| = per_cpu(svm_data, raw_smp_processor_id()); |
| |
| if (svm_data) { |
| uint64_t efer; |
| |
| wrmsrl(MSR_VM_HSAVE_PA, 0); |
| rdmsrl(MSR_EFER, efer); |
| wrmsrl(MSR_EFER, efer & ~MSR_EFER_SVME_MASK); |
| per_cpu(svm_data, raw_smp_processor_id()) = NULL; |
| __free_page(svm_data->save_area); |
| kfree(svm_data); |
| } |
| } |
| |
| static void svm_hardware_enable(void *garbage) |
| { |
| |
| struct svm_cpu_data *svm_data; |
| uint64_t efer; |
| #ifdef CONFIG_X86_64 |
| struct desc_ptr gdt_descr; |
| #else |
| struct desc_ptr gdt_descr; |
| #endif |
| struct desc_struct *gdt; |
| int me = raw_smp_processor_id(); |
| |
| if (!has_svm()) { |
| printk(KERN_ERR "svm_cpu_init: err EOPNOTSUPP on %d\n", me); |
| return; |
| } |
| svm_data = per_cpu(svm_data, me); |
| |
| if (!svm_data) { |
| printk(KERN_ERR "svm_cpu_init: svm_data is NULL on %d\n", |
| me); |
| return; |
| } |
| |
| svm_data->asid_generation = 1; |
| svm_data->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1; |
| svm_data->next_asid = svm_data->max_asid + 1; |
| |
| asm volatile ("sgdt %0" : "=m"(gdt_descr)); |
| gdt = (struct desc_struct *)gdt_descr.address; |
| svm_data->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS); |
| |
| rdmsrl(MSR_EFER, efer); |
| wrmsrl(MSR_EFER, efer | MSR_EFER_SVME_MASK); |
| |
| wrmsrl(MSR_VM_HSAVE_PA, |
| page_to_pfn(svm_data->save_area) << PAGE_SHIFT); |
| } |
| |
| static int svm_cpu_init(int cpu) |
| { |
| struct svm_cpu_data *svm_data; |
| int r; |
| |
| svm_data = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL); |
| if (!svm_data) |
| return -ENOMEM; |
| svm_data->cpu = cpu; |
| svm_data->save_area = alloc_page(GFP_KERNEL); |
| r = -ENOMEM; |
| if (!svm_data->save_area) |
| goto err_1; |
| |
| per_cpu(svm_data, cpu) = svm_data; |
| |
| return 0; |
| |
| err_1: |
| kfree(svm_data); |
| return r; |
| |
| } |
| |
| static void set_msr_interception(u32 *msrpm, unsigned msr, |
| int read, int write) |
| { |
| int i; |
| |
| for (i = 0; i < NUM_MSR_MAPS; i++) { |
| if (msr >= msrpm_ranges[i] && |
| msr < msrpm_ranges[i] + MSRS_IN_RANGE) { |
| u32 msr_offset = (i * MSRS_IN_RANGE + msr - |
| msrpm_ranges[i]) * 2; |
| |
| u32 *base = msrpm + (msr_offset / 32); |
| u32 msr_shift = msr_offset % 32; |
| u32 mask = ((write) ? 0 : 2) | ((read) ? 0 : 1); |
| *base = (*base & ~(0x3 << msr_shift)) | |
| (mask << msr_shift); |
| return; |
| } |
| } |
| BUG(); |
| } |
| |
| static __init int svm_hardware_setup(void) |
| { |
| int cpu; |
| struct page *iopm_pages; |
| struct page *msrpm_pages; |
| void *iopm_va, *msrpm_va; |
| int r; |
| |
| iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER); |
| |
| if (!iopm_pages) |
| return -ENOMEM; |
| |
| iopm_va = page_address(iopm_pages); |
| memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER)); |
| clear_bit(0x80, iopm_va); /* allow direct access to PC debug port */ |
| iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT; |
| |
| |
| msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER); |
| |
| r = -ENOMEM; |
| if (!msrpm_pages) |
| goto err_1; |
| |
| msrpm_va = page_address(msrpm_pages); |
| memset(msrpm_va, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER)); |
| msrpm_base = page_to_pfn(msrpm_pages) << PAGE_SHIFT; |
| |
| #ifdef CONFIG_X86_64 |
| set_msr_interception(msrpm_va, MSR_GS_BASE, 1, 1); |
| set_msr_interception(msrpm_va, MSR_FS_BASE, 1, 1); |
| set_msr_interception(msrpm_va, MSR_KERNEL_GS_BASE, 1, 1); |
| set_msr_interception(msrpm_va, MSR_LSTAR, 1, 1); |
| set_msr_interception(msrpm_va, MSR_CSTAR, 1, 1); |
| set_msr_interception(msrpm_va, MSR_SYSCALL_MASK, 1, 1); |
| #endif |
| set_msr_interception(msrpm_va, MSR_K6_STAR, 1, 1); |
| set_msr_interception(msrpm_va, MSR_IA32_SYSENTER_CS, 1, 1); |
| set_msr_interception(msrpm_va, MSR_IA32_SYSENTER_ESP, 1, 1); |
| set_msr_interception(msrpm_va, MSR_IA32_SYSENTER_EIP, 1, 1); |
| |
| if (boot_cpu_has(X86_FEATURE_NX)) |
| kvm_enable_efer_bits(EFER_NX); |
| |
| for_each_online_cpu(cpu) { |
| r = svm_cpu_init(cpu); |
| if (r) |
| goto err_2; |
| } |
| |
| svm_features = cpuid_edx(SVM_CPUID_FUNC); |
| |
| if (!svm_has(SVM_FEATURE_NPT)) |
| npt_enabled = false; |
| |
| if (npt_enabled && !npt) { |
| printk(KERN_INFO "kvm: Nested Paging disabled\n"); |
| npt_enabled = false; |
| } |
| |
| if (npt_enabled) { |
| printk(KERN_INFO "kvm: Nested Paging enabled\n"); |
| kvm_enable_tdp(); |
| } |
| |
| return 0; |
| |
| err_2: |
| __free_pages(msrpm_pages, MSRPM_ALLOC_ORDER); |
| msrpm_base = 0; |
| err_1: |
| __free_pages(iopm_pages, IOPM_ALLOC_ORDER); |
| iopm_base = 0; |
| return r; |
| } |
| |
| static __exit void svm_hardware_unsetup(void) |
| { |
| __free_pages(pfn_to_page(msrpm_base >> PAGE_SHIFT), MSRPM_ALLOC_ORDER); |
| __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER); |
| iopm_base = msrpm_base = 0; |
| } |
| |
| static void init_seg(struct vmcb_seg *seg) |
| { |
| seg->selector = 0; |
| seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK | |
| SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */ |
| seg->limit = 0xffff; |
| seg->base = 0; |
| } |
| |
| static void init_sys_seg(struct vmcb_seg *seg, uint32_t type) |
| { |
| seg->selector = 0; |
| seg->attrib = SVM_SELECTOR_P_MASK | type; |
| seg->limit = 0xffff; |
| seg->base = 0; |
| } |
| |
| static void init_vmcb(struct vmcb *vmcb) |
| { |
| struct vmcb_control_area *control = &vmcb->control; |
| struct vmcb_save_area *save = &vmcb->save; |
| |
| control->intercept_cr_read = INTERCEPT_CR0_MASK | |
| INTERCEPT_CR3_MASK | |
| INTERCEPT_CR4_MASK | |
| INTERCEPT_CR8_MASK; |
| |
| control->intercept_cr_write = INTERCEPT_CR0_MASK | |
| INTERCEPT_CR3_MASK | |
| INTERCEPT_CR4_MASK | |
| INTERCEPT_CR8_MASK; |
| |
| control->intercept_dr_read = INTERCEPT_DR0_MASK | |
| INTERCEPT_DR1_MASK | |
| INTERCEPT_DR2_MASK | |
| INTERCEPT_DR3_MASK; |
| |
| control->intercept_dr_write = INTERCEPT_DR0_MASK | |
| INTERCEPT_DR1_MASK | |
| INTERCEPT_DR2_MASK | |
| INTERCEPT_DR3_MASK | |
| INTERCEPT_DR5_MASK | |
| INTERCEPT_DR7_MASK; |
| |
| control->intercept_exceptions = (1 << PF_VECTOR) | |
| (1 << UD_VECTOR); |
| |
| |
| control->intercept = (1ULL << INTERCEPT_INTR) | |
| (1ULL << INTERCEPT_NMI) | |
| (1ULL << INTERCEPT_SMI) | |
| /* |
| * selective cr0 intercept bug? |
| * 0: 0f 22 d8 mov %eax,%cr3 |
| * 3: 0f 20 c0 mov %cr0,%eax |
| * 6: 0d 00 00 00 80 or $0x80000000,%eax |
| * b: 0f 22 c0 mov %eax,%cr0 |
| * set cr3 ->interception |
| * get cr0 ->interception |
| * set cr0 -> no interception |
| */ |
| /* (1ULL << INTERCEPT_SELECTIVE_CR0) | */ |
| (1ULL << INTERCEPT_CPUID) | |
| (1ULL << INTERCEPT_INVD) | |
| (1ULL << INTERCEPT_HLT) | |
| (1ULL << INTERCEPT_INVLPGA) | |
| (1ULL << INTERCEPT_IOIO_PROT) | |
| (1ULL << INTERCEPT_MSR_PROT) | |
| (1ULL << INTERCEPT_TASK_SWITCH) | |
| (1ULL << INTERCEPT_SHUTDOWN) | |
| (1ULL << INTERCEPT_VMRUN) | |
| (1ULL << INTERCEPT_VMMCALL) | |
| (1ULL << INTERCEPT_VMLOAD) | |
| (1ULL << INTERCEPT_VMSAVE) | |
| (1ULL << INTERCEPT_STGI) | |
| (1ULL << INTERCEPT_CLGI) | |
| (1ULL << INTERCEPT_SKINIT) | |
| (1ULL << INTERCEPT_WBINVD) | |
| (1ULL << INTERCEPT_MONITOR) | |
| (1ULL << INTERCEPT_MWAIT); |
| |
| control->iopm_base_pa = iopm_base; |
| control->msrpm_base_pa = msrpm_base; |
| control->tsc_offset = 0; |
| control->int_ctl = V_INTR_MASKING_MASK; |
| |
| init_seg(&save->es); |
| init_seg(&save->ss); |
| init_seg(&save->ds); |
| init_seg(&save->fs); |
| init_seg(&save->gs); |
| |
| save->cs.selector = 0xf000; |
| /* Executable/Readable Code Segment */ |
| save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK | |
| SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK; |
| save->cs.limit = 0xffff; |
| /* |
| * cs.base should really be 0xffff0000, but vmx can't handle that, so |
| * be consistent with it. |
| * |
| * Replace when we have real mode working for vmx. |
| */ |
| save->cs.base = 0xf0000; |
| |
| save->gdtr.limit = 0xffff; |
| save->idtr.limit = 0xffff; |
| |
| init_sys_seg(&save->ldtr, SEG_TYPE_LDT); |
| init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16); |
| |
| save->efer = MSR_EFER_SVME_MASK; |
| save->dr6 = 0xffff0ff0; |
| save->dr7 = 0x400; |
| save->rflags = 2; |
| save->rip = 0x0000fff0; |
| |
| /* |
| * cr0 val on cpu init should be 0x60000010, we enable cpu |
| * cache by default. the orderly way is to enable cache in bios. |
| */ |
| save->cr0 = 0x00000010 | X86_CR0_PG | X86_CR0_WP; |
| save->cr4 = X86_CR4_PAE; |
| /* rdx = ?? */ |
| } |
| |
| static int svm_vcpu_reset(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| init_vmcb(svm->vmcb); |
| |
| if (vcpu->vcpu_id != 0) { |
| svm->vmcb->save.rip = 0; |
| svm->vmcb->save.cs.base = svm->vcpu.arch.sipi_vector << 12; |
| svm->vmcb->save.cs.selector = svm->vcpu.arch.sipi_vector << 8; |
| } |
| |
| return 0; |
| } |
| |
| static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id) |
| { |
| struct vcpu_svm *svm; |
| struct page *page; |
| int err; |
| |
| svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); |
| if (!svm) { |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| err = kvm_vcpu_init(&svm->vcpu, kvm, id); |
| if (err) |
| goto free_svm; |
| |
| page = alloc_page(GFP_KERNEL); |
| if (!page) { |
| err = -ENOMEM; |
| goto uninit; |
| } |
| |
| svm->vmcb = page_address(page); |
| clear_page(svm->vmcb); |
| svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT; |
| svm->asid_generation = 0; |
| memset(svm->db_regs, 0, sizeof(svm->db_regs)); |
| init_vmcb(svm->vmcb); |
| |
| fx_init(&svm->vcpu); |
| svm->vcpu.fpu_active = 1; |
| svm->vcpu.arch.apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE; |
| if (svm->vcpu.vcpu_id == 0) |
| svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP; |
| |
| return &svm->vcpu; |
| |
| uninit: |
| kvm_vcpu_uninit(&svm->vcpu); |
| free_svm: |
| kmem_cache_free(kvm_vcpu_cache, svm); |
| out: |
| return ERR_PTR(err); |
| } |
| |
| static void svm_free_vcpu(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| __free_page(pfn_to_page(svm->vmcb_pa >> PAGE_SHIFT)); |
| kvm_vcpu_uninit(vcpu); |
| kmem_cache_free(kvm_vcpu_cache, svm); |
| } |
| |
| static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| int i; |
| |
| if (unlikely(cpu != vcpu->cpu)) { |
| u64 tsc_this, delta; |
| |
| /* |
| * Make sure that the guest sees a monotonically |
| * increasing TSC. |
| */ |
| rdtscll(tsc_this); |
| delta = vcpu->arch.host_tsc - tsc_this; |
| svm->vmcb->control.tsc_offset += delta; |
| vcpu->cpu = cpu; |
| kvm_migrate_apic_timer(vcpu); |
| } |
| |
| for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++) |
| rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]); |
| } |
| |
| static void svm_vcpu_put(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| int i; |
| |
| ++vcpu->stat.host_state_reload; |
| for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++) |
| wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]); |
| |
| rdtscll(vcpu->arch.host_tsc); |
| } |
| |
| static void svm_vcpu_decache(struct kvm_vcpu *vcpu) |
| { |
| } |
| |
| static void svm_cache_regs(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| vcpu->arch.regs[VCPU_REGS_RAX] = svm->vmcb->save.rax; |
| vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp; |
| vcpu->arch.rip = svm->vmcb->save.rip; |
| } |
| |
| static void svm_decache_regs(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX]; |
| svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP]; |
| svm->vmcb->save.rip = vcpu->arch.rip; |
| } |
| |
| static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu) |
| { |
| return to_svm(vcpu)->vmcb->save.rflags; |
| } |
| |
| static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) |
| { |
| to_svm(vcpu)->vmcb->save.rflags = rflags; |
| } |
| |
| static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg) |
| { |
| struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save; |
| |
| switch (seg) { |
| case VCPU_SREG_CS: return &save->cs; |
| case VCPU_SREG_DS: return &save->ds; |
| case VCPU_SREG_ES: return &save->es; |
| case VCPU_SREG_FS: return &save->fs; |
| case VCPU_SREG_GS: return &save->gs; |
| case VCPU_SREG_SS: return &save->ss; |
| case VCPU_SREG_TR: return &save->tr; |
| case VCPU_SREG_LDTR: return &save->ldtr; |
| } |
| BUG(); |
| return NULL; |
| } |
| |
| static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg) |
| { |
| struct vmcb_seg *s = svm_seg(vcpu, seg); |
| |
| return s->base; |
| } |
| |
| static void svm_get_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg) |
| { |
| struct vmcb_seg *s = svm_seg(vcpu, seg); |
| |
| var->base = s->base; |
| var->limit = s->limit; |
| var->selector = s->selector; |
| var->type = s->attrib & SVM_SELECTOR_TYPE_MASK; |
| var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1; |
| var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3; |
| var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1; |
| var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1; |
| var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1; |
| var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1; |
| var->g = (s->attrib >> SVM_SELECTOR_G_SHIFT) & 1; |
| var->unusable = !var->present; |
| } |
| |
| static void svm_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| dt->limit = svm->vmcb->save.idtr.limit; |
| dt->base = svm->vmcb->save.idtr.base; |
| } |
| |
| static void svm_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm->vmcb->save.idtr.limit = dt->limit; |
| svm->vmcb->save.idtr.base = dt->base ; |
| } |
| |
| static void svm_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| dt->limit = svm->vmcb->save.gdtr.limit; |
| dt->base = svm->vmcb->save.gdtr.base; |
| } |
| |
| static void svm_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm->vmcb->save.gdtr.limit = dt->limit; |
| svm->vmcb->save.gdtr.base = dt->base ; |
| } |
| |
| static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) |
| { |
| } |
| |
| static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| #ifdef CONFIG_X86_64 |
| if (vcpu->arch.shadow_efer & EFER_LME) { |
| if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { |
| vcpu->arch.shadow_efer |= EFER_LMA; |
| svm->vmcb->save.efer |= EFER_LMA | EFER_LME; |
| } |
| |
| if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) { |
| vcpu->arch.shadow_efer &= ~EFER_LMA; |
| svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME); |
| } |
| } |
| #endif |
| if ((vcpu->arch.cr0 & X86_CR0_TS) && !(cr0 & X86_CR0_TS)) { |
| svm->vmcb->control.intercept_exceptions &= ~(1 << NM_VECTOR); |
| vcpu->fpu_active = 1; |
| } |
| |
| vcpu->arch.cr0 = cr0; |
| cr0 |= X86_CR0_PG | X86_CR0_WP; |
| cr0 &= ~(X86_CR0_CD | X86_CR0_NW); |
| if (!vcpu->fpu_active) { |
| svm->vmcb->control.intercept_exceptions |= (1 << NM_VECTOR); |
| cr0 |= X86_CR0_TS; |
| } |
| svm->vmcb->save.cr0 = cr0; |
| } |
| |
| static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) |
| { |
| vcpu->arch.cr4 = cr4; |
| to_svm(vcpu)->vmcb->save.cr4 = cr4 | X86_CR4_PAE; |
| } |
| |
| static void svm_set_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| struct vmcb_seg *s = svm_seg(vcpu, seg); |
| |
| s->base = var->base; |
| s->limit = var->limit; |
| s->selector = var->selector; |
| if (var->unusable) |
| s->attrib = 0; |
| else { |
| s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK); |
| s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT; |
| s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT; |
| s->attrib |= (var->present & 1) << SVM_SELECTOR_P_SHIFT; |
| s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT; |
| s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT; |
| s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT; |
| s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT; |
| } |
| if (seg == VCPU_SREG_CS) |
| svm->vmcb->save.cpl |
| = (svm->vmcb->save.cs.attrib |
| >> SVM_SELECTOR_DPL_SHIFT) & 3; |
| |
| } |
| |
| /* FIXME: |
| |
| svm(vcpu)->vmcb->control.int_ctl &= ~V_TPR_MASK; |
| svm(vcpu)->vmcb->control.int_ctl |= (sregs->cr8 & V_TPR_MASK); |
| |
| */ |
| |
| static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static int svm_get_irq(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| u32 exit_int_info = svm->vmcb->control.exit_int_info; |
| |
| if (is_external_interrupt(exit_int_info)) |
| return exit_int_info & SVM_EVTINJ_VEC_MASK; |
| return -1; |
| } |
| |
| static void load_host_msrs(struct kvm_vcpu *vcpu) |
| { |
| #ifdef CONFIG_X86_64 |
| wrmsrl(MSR_GS_BASE, to_svm(vcpu)->host_gs_base); |
| #endif |
| } |
| |
| static void save_host_msrs(struct kvm_vcpu *vcpu) |
| { |
| #ifdef CONFIG_X86_64 |
| rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host_gs_base); |
| #endif |
| } |
| |
| static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *svm_data) |
| { |
| if (svm_data->next_asid > svm_data->max_asid) { |
| ++svm_data->asid_generation; |
| svm_data->next_asid = 1; |
| svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID; |
| } |
| |
| svm->vcpu.cpu = svm_data->cpu; |
| svm->asid_generation = svm_data->asid_generation; |
| svm->vmcb->control.asid = svm_data->next_asid++; |
| } |
| |
| static unsigned long svm_get_dr(struct kvm_vcpu *vcpu, int dr) |
| { |
| return to_svm(vcpu)->db_regs[dr]; |
| } |
| |
| static void svm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long value, |
| int *exception) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| *exception = 0; |
| |
| if (svm->vmcb->save.dr7 & DR7_GD_MASK) { |
| svm->vmcb->save.dr7 &= ~DR7_GD_MASK; |
| svm->vmcb->save.dr6 |= DR6_BD_MASK; |
| *exception = DB_VECTOR; |
| return; |
| } |
| |
| switch (dr) { |
| case 0 ... 3: |
| svm->db_regs[dr] = value; |
| return; |
| case 4 ... 5: |
| if (vcpu->arch.cr4 & X86_CR4_DE) { |
| *exception = UD_VECTOR; |
| return; |
| } |
| case 7: { |
| if (value & ~((1ULL << 32) - 1)) { |
| *exception = GP_VECTOR; |
| return; |
| } |
| svm->vmcb->save.dr7 = value; |
| return; |
| } |
| default: |
| printk(KERN_DEBUG "%s: unexpected dr %u\n", |
| __FUNCTION__, dr); |
| *exception = UD_VECTOR; |
| return; |
| } |
| } |
| |
| static int pf_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| u32 exit_int_info = svm->vmcb->control.exit_int_info; |
| struct kvm *kvm = svm->vcpu.kvm; |
| u64 fault_address; |
| u32 error_code; |
| |
| if (!irqchip_in_kernel(kvm) && |
| is_external_interrupt(exit_int_info)) |
| push_irq(&svm->vcpu, exit_int_info & SVM_EVTINJ_VEC_MASK); |
| |
| fault_address = svm->vmcb->control.exit_info_2; |
| error_code = svm->vmcb->control.exit_info_1; |
| return kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code); |
| } |
| |
| static int ud_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| int er; |
| |
| er = emulate_instruction(&svm->vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD); |
| if (er != EMULATE_DONE) |
| kvm_queue_exception(&svm->vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| static int nm_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| svm->vmcb->control.intercept_exceptions &= ~(1 << NM_VECTOR); |
| if (!(svm->vcpu.arch.cr0 & X86_CR0_TS)) |
| svm->vmcb->save.cr0 &= ~X86_CR0_TS; |
| svm->vcpu.fpu_active = 1; |
| |
| return 1; |
| } |
| |
| static int shutdown_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| /* |
| * VMCB is undefined after a SHUTDOWN intercept |
| * so reinitialize it. |
| */ |
| clear_page(svm->vmcb); |
| init_vmcb(svm->vmcb); |
| |
| kvm_run->exit_reason = KVM_EXIT_SHUTDOWN; |
| return 0; |
| } |
| |
| static int io_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */ |
| int size, down, in, string, rep; |
| unsigned port; |
| |
| ++svm->vcpu.stat.io_exits; |
| |
| svm->next_rip = svm->vmcb->control.exit_info_2; |
| |
| string = (io_info & SVM_IOIO_STR_MASK) != 0; |
| |
| if (string) { |
| if (emulate_instruction(&svm->vcpu, |
| kvm_run, 0, 0, 0) == EMULATE_DO_MMIO) |
| return 0; |
| return 1; |
| } |
| |
| in = (io_info & SVM_IOIO_TYPE_MASK) != 0; |
| port = io_info >> 16; |
| size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT; |
| rep = (io_info & SVM_IOIO_REP_MASK) != 0; |
| down = (svm->vmcb->save.rflags & X86_EFLAGS_DF) != 0; |
| |
| return kvm_emulate_pio(&svm->vcpu, kvm_run, in, size, port); |
| } |
| |
| static int nop_on_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| return 1; |
| } |
| |
| static int halt_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| svm->next_rip = svm->vmcb->save.rip + 1; |
| skip_emulated_instruction(&svm->vcpu); |
| return kvm_emulate_halt(&svm->vcpu); |
| } |
| |
| static int vmmcall_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| svm->next_rip = svm->vmcb->save.rip + 3; |
| skip_emulated_instruction(&svm->vcpu); |
| kvm_emulate_hypercall(&svm->vcpu); |
| return 1; |
| } |
| |
| static int invalid_op_interception(struct vcpu_svm *svm, |
| struct kvm_run *kvm_run) |
| { |
| kvm_queue_exception(&svm->vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| static int task_switch_interception(struct vcpu_svm *svm, |
| struct kvm_run *kvm_run) |
| { |
| pr_unimpl(&svm->vcpu, "%s: task switch is unsupported\n", __FUNCTION__); |
| kvm_run->exit_reason = KVM_EXIT_UNKNOWN; |
| return 0; |
| } |
| |
| static int cpuid_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| svm->next_rip = svm->vmcb->save.rip + 2; |
| kvm_emulate_cpuid(&svm->vcpu); |
| return 1; |
| } |
| |
| static int emulate_on_interception(struct vcpu_svm *svm, |
| struct kvm_run *kvm_run) |
| { |
| if (emulate_instruction(&svm->vcpu, NULL, 0, 0, 0) != EMULATE_DONE) |
| pr_unimpl(&svm->vcpu, "%s: failed\n", __FUNCTION__); |
| return 1; |
| } |
| |
| static int cr8_write_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| emulate_instruction(&svm->vcpu, NULL, 0, 0, 0); |
| if (irqchip_in_kernel(svm->vcpu.kvm)) |
| return 1; |
| kvm_run->exit_reason = KVM_EXIT_SET_TPR; |
| return 0; |
| } |
| |
| static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| switch (ecx) { |
| case MSR_IA32_TIME_STAMP_COUNTER: { |
| u64 tsc; |
| |
| rdtscll(tsc); |
| *data = svm->vmcb->control.tsc_offset + tsc; |
| break; |
| } |
| case MSR_K6_STAR: |
| *data = svm->vmcb->save.star; |
| break; |
| #ifdef CONFIG_X86_64 |
| case MSR_LSTAR: |
| *data = svm->vmcb->save.lstar; |
| break; |
| case MSR_CSTAR: |
| *data = svm->vmcb->save.cstar; |
| break; |
| case MSR_KERNEL_GS_BASE: |
| *data = svm->vmcb->save.kernel_gs_base; |
| break; |
| case MSR_SYSCALL_MASK: |
| *data = svm->vmcb->save.sfmask; |
| break; |
| #endif |
| case MSR_IA32_SYSENTER_CS: |
| *data = svm->vmcb->save.sysenter_cs; |
| break; |
| case MSR_IA32_SYSENTER_EIP: |
| *data = svm->vmcb->save.sysenter_eip; |
| break; |
| case MSR_IA32_SYSENTER_ESP: |
| *data = svm->vmcb->save.sysenter_esp; |
| break; |
| /* Nobody will change the following 5 values in the VMCB so |
| we can safely return them on rdmsr. They will always be 0 |
| until LBRV is implemented. */ |
| case MSR_IA32_DEBUGCTLMSR: |
| *data = svm->vmcb->save.dbgctl; |
| break; |
| case MSR_IA32_LASTBRANCHFROMIP: |
| *data = svm->vmcb->save.br_from; |
| break; |
| case MSR_IA32_LASTBRANCHTOIP: |
| *data = svm->vmcb->save.br_to; |
| break; |
| case MSR_IA32_LASTINTFROMIP: |
| *data = svm->vmcb->save.last_excp_from; |
| break; |
| case MSR_IA32_LASTINTTOIP: |
| *data = svm->vmcb->save.last_excp_to; |
| break; |
| default: |
| return kvm_get_msr_common(vcpu, ecx, data); |
| } |
| return 0; |
| } |
| |
| static int rdmsr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX]; |
| u64 data; |
| |
| if (svm_get_msr(&svm->vcpu, ecx, &data)) |
| kvm_inject_gp(&svm->vcpu, 0); |
| else { |
| svm->vmcb->save.rax = data & 0xffffffff; |
| svm->vcpu.arch.regs[VCPU_REGS_RDX] = data >> 32; |
| svm->next_rip = svm->vmcb->save.rip + 2; |
| skip_emulated_instruction(&svm->vcpu); |
| } |
| return 1; |
| } |
| |
| static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| switch (ecx) { |
| case MSR_IA32_TIME_STAMP_COUNTER: { |
| u64 tsc; |
| |
| rdtscll(tsc); |
| svm->vmcb->control.tsc_offset = data - tsc; |
| break; |
| } |
| case MSR_K6_STAR: |
| svm->vmcb->save.star = data; |
| break; |
| #ifdef CONFIG_X86_64 |
| case MSR_LSTAR: |
| svm->vmcb->save.lstar = data; |
| break; |
| case MSR_CSTAR: |
| svm->vmcb->save.cstar = data; |
| break; |
| case MSR_KERNEL_GS_BASE: |
| svm->vmcb->save.kernel_gs_base = data; |
| break; |
| case MSR_SYSCALL_MASK: |
| svm->vmcb->save.sfmask = data; |
| break; |
| #endif |
| case MSR_IA32_SYSENTER_CS: |
| svm->vmcb->save.sysenter_cs = data; |
| break; |
| case MSR_IA32_SYSENTER_EIP: |
| svm->vmcb->save.sysenter_eip = data; |
| break; |
| case MSR_IA32_SYSENTER_ESP: |
| svm->vmcb->save.sysenter_esp = data; |
| break; |
| case MSR_IA32_DEBUGCTLMSR: |
| pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n", |
| __FUNCTION__, data); |
| break; |
| case MSR_K7_EVNTSEL0: |
| case MSR_K7_EVNTSEL1: |
| case MSR_K7_EVNTSEL2: |
| case MSR_K7_EVNTSEL3: |
| /* |
| * only support writing 0 to the performance counters for now |
| * to make Windows happy. Should be replaced by a real |
| * performance counter emulation later. |
| */ |
| if (data != 0) |
| goto unhandled; |
| break; |
| default: |
| unhandled: |
| return kvm_set_msr_common(vcpu, ecx, data); |
| } |
| return 0; |
| } |
| |
| static int wrmsr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX]; |
| u64 data = (svm->vmcb->save.rax & -1u) |
| | ((u64)(svm->vcpu.arch.regs[VCPU_REGS_RDX] & -1u) << 32); |
| svm->next_rip = svm->vmcb->save.rip + 2; |
| if (svm_set_msr(&svm->vcpu, ecx, data)) |
| kvm_inject_gp(&svm->vcpu, 0); |
| else |
| skip_emulated_instruction(&svm->vcpu); |
| return 1; |
| } |
| |
| static int msr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) |
| { |
| if (svm->vmcb->control.exit_info_1) |
| return wrmsr_interception(svm, kvm_run); |
| else |
| return rdmsr_interception(svm, kvm_run); |
| } |
| |
| static int interrupt_window_interception(struct vcpu_svm *svm, |
| struct kvm_run *kvm_run) |
| { |
| svm->vmcb->control.intercept &= ~(1ULL << INTERCEPT_VINTR); |
| svm->vmcb->control.int_ctl &= ~V_IRQ_MASK; |
| /* |
| * If the user space waits to inject interrupts, exit as soon as |
| * possible |
| */ |
| if (kvm_run->request_interrupt_window && |
| !svm->vcpu.arch.irq_summary) { |
| ++svm->vcpu.stat.irq_window_exits; |
| kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int (*svm_exit_handlers[])(struct vcpu_svm *svm, |
| struct kvm_run *kvm_run) = { |
| [SVM_EXIT_READ_CR0] = emulate_on_interception, |
| [SVM_EXIT_READ_CR3] = emulate_on_interception, |
| [SVM_EXIT_READ_CR4] = emulate_on_interception, |
| [SVM_EXIT_READ_CR8] = emulate_on_interception, |
| /* for now: */ |
| [SVM_EXIT_WRITE_CR0] = emulate_on_interception, |
| [SVM_EXIT_WRITE_CR3] = emulate_on_interception, |
| [SVM_EXIT_WRITE_CR4] = emulate_on_interception, |
| [SVM_EXIT_WRITE_CR8] = cr8_write_interception, |
| [SVM_EXIT_READ_DR0] = emulate_on_interception, |
| [SVM_EXIT_READ_DR1] = emulate_on_interception, |
| [SVM_EXIT_READ_DR2] = emulate_on_interception, |
| [SVM_EXIT_READ_DR3] = emulate_on_interception, |
| [SVM_EXIT_WRITE_DR0] = emulate_on_interception, |
| [SVM_EXIT_WRITE_DR1] = emulate_on_interception, |
| [SVM_EXIT_WRITE_DR2] = emulate_on_interception, |
| [SVM_EXIT_WRITE_DR3] = emulate_on_interception, |
| [SVM_EXIT_WRITE_DR5] = emulate_on_interception, |
| [SVM_EXIT_WRITE_DR7] = emulate_on_interception, |
| [SVM_EXIT_EXCP_BASE + UD_VECTOR] = ud_interception, |
| [SVM_EXIT_EXCP_BASE + PF_VECTOR] = pf_interception, |
| [SVM_EXIT_EXCP_BASE + NM_VECTOR] = nm_interception, |
| [SVM_EXIT_INTR] = nop_on_interception, |
| [SVM_EXIT_NMI] = nop_on_interception, |
| [SVM_EXIT_SMI] = nop_on_interception, |
| [SVM_EXIT_INIT] = nop_on_interception, |
| [SVM_EXIT_VINTR] = interrupt_window_interception, |
| /* [SVM_EXIT_CR0_SEL_WRITE] = emulate_on_interception, */ |
| [SVM_EXIT_CPUID] = cpuid_interception, |
| [SVM_EXIT_INVD] = emulate_on_interception, |
| [SVM_EXIT_HLT] = halt_interception, |
| [SVM_EXIT_INVLPG] = emulate_on_interception, |
| [SVM_EXIT_INVLPGA] = invalid_op_interception, |
| [SVM_EXIT_IOIO] = io_interception, |
| [SVM_EXIT_MSR] = msr_interception, |
| [SVM_EXIT_TASK_SWITCH] = task_switch_interception, |
| [SVM_EXIT_SHUTDOWN] = shutdown_interception, |
| [SVM_EXIT_VMRUN] = invalid_op_interception, |
| [SVM_EXIT_VMMCALL] = vmmcall_interception, |
| [SVM_EXIT_VMLOAD] = invalid_op_interception, |
| [SVM_EXIT_VMSAVE] = invalid_op_interception, |
| [SVM_EXIT_STGI] = invalid_op_interception, |
| [SVM_EXIT_CLGI] = invalid_op_interception, |
| [SVM_EXIT_SKINIT] = invalid_op_interception, |
| [SVM_EXIT_WBINVD] = emulate_on_interception, |
| [SVM_EXIT_MONITOR] = invalid_op_interception, |
| [SVM_EXIT_MWAIT] = invalid_op_interception, |
| }; |
| |
| |
| static int handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| u32 exit_code = svm->vmcb->control.exit_code; |
| |
| kvm_reput_irq(svm); |
| |
| if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) { |
| kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY; |
| kvm_run->fail_entry.hardware_entry_failure_reason |
| = svm->vmcb->control.exit_code; |
| return 0; |
| } |
| |
| if (is_external_interrupt(svm->vmcb->control.exit_int_info) && |
| exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR) |
| printk(KERN_ERR "%s: unexpected exit_ini_info 0x%x " |
| "exit_code 0x%x\n", |
| __FUNCTION__, svm->vmcb->control.exit_int_info, |
| exit_code); |
| |
| if (exit_code >= ARRAY_SIZE(svm_exit_handlers) |
| || !svm_exit_handlers[exit_code]) { |
| kvm_run->exit_reason = KVM_EXIT_UNKNOWN; |
| kvm_run->hw.hardware_exit_reason = exit_code; |
| return 0; |
| } |
| |
| return svm_exit_handlers[exit_code](svm, kvm_run); |
| } |
| |
| static void reload_tss(struct kvm_vcpu *vcpu) |
| { |
| int cpu = raw_smp_processor_id(); |
| |
| struct svm_cpu_data *svm_data = per_cpu(svm_data, cpu); |
| svm_data->tss_desc->type = 9; /* available 32/64-bit TSS */ |
| load_TR_desc(); |
| } |
| |
| static void pre_svm_run(struct vcpu_svm *svm) |
| { |
| int cpu = raw_smp_processor_id(); |
| |
| struct svm_cpu_data *svm_data = per_cpu(svm_data, cpu); |
| |
| svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING; |
| if (svm->vcpu.cpu != cpu || |
| svm->asid_generation != svm_data->asid_generation) |
| new_asid(svm, svm_data); |
| } |
| |
| |
| static inline void svm_inject_irq(struct vcpu_svm *svm, int irq) |
| { |
| struct vmcb_control_area *control; |
| |
| control = &svm->vmcb->control; |
| control->int_vector = irq; |
| control->int_ctl &= ~V_INTR_PRIO_MASK; |
| control->int_ctl |= V_IRQ_MASK | |
| ((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT); |
| } |
| |
| static void svm_set_irq(struct kvm_vcpu *vcpu, int irq) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm_inject_irq(svm, irq); |
| } |
| |
| static void svm_intr_assist(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| struct vmcb *vmcb = svm->vmcb; |
| int intr_vector = -1; |
| |
| if ((vmcb->control.exit_int_info & SVM_EVTINJ_VALID) && |
| ((vmcb->control.exit_int_info & SVM_EVTINJ_TYPE_MASK) == 0)) { |
| intr_vector = vmcb->control.exit_int_info & |
| SVM_EVTINJ_VEC_MASK; |
| vmcb->control.exit_int_info = 0; |
| svm_inject_irq(svm, intr_vector); |
| return; |
| } |
| |
| if (vmcb->control.int_ctl & V_IRQ_MASK) |
| return; |
| |
| if (!kvm_cpu_has_interrupt(vcpu)) |
| return; |
| |
| if (!(vmcb->save.rflags & X86_EFLAGS_IF) || |
| (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) || |
| (vmcb->control.event_inj & SVM_EVTINJ_VALID)) { |
| /* unable to deliver irq, set pending irq */ |
| vmcb->control.intercept |= (1ULL << INTERCEPT_VINTR); |
| svm_inject_irq(svm, 0x0); |
| return; |
| } |
| /* Okay, we can deliver the interrupt: grab it and update PIC state. */ |
| intr_vector = kvm_cpu_get_interrupt(vcpu); |
| svm_inject_irq(svm, intr_vector); |
| kvm_timer_intr_post(vcpu, intr_vector); |
| } |
| |
| static void kvm_reput_irq(struct vcpu_svm *svm) |
| { |
| struct vmcb_control_area *control = &svm->vmcb->control; |
| |
| if ((control->int_ctl & V_IRQ_MASK) |
| && !irqchip_in_kernel(svm->vcpu.kvm)) { |
| control->int_ctl &= ~V_IRQ_MASK; |
| push_irq(&svm->vcpu, control->int_vector); |
| } |
| |
| svm->vcpu.arch.interrupt_window_open = |
| !(control->int_state & SVM_INTERRUPT_SHADOW_MASK); |
| } |
| |
| static void svm_do_inject_vector(struct vcpu_svm *svm) |
| { |
| struct kvm_vcpu *vcpu = &svm->vcpu; |
| int word_index = __ffs(vcpu->arch.irq_summary); |
| int bit_index = __ffs(vcpu->arch.irq_pending[word_index]); |
| int irq = word_index * BITS_PER_LONG + bit_index; |
| |
| clear_bit(bit_index, &vcpu->arch.irq_pending[word_index]); |
| if (!vcpu->arch.irq_pending[word_index]) |
| clear_bit(word_index, &vcpu->arch.irq_summary); |
| svm_inject_irq(svm, irq); |
| } |
| |
| static void do_interrupt_requests(struct kvm_vcpu *vcpu, |
| struct kvm_run *kvm_run) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| struct vmcb_control_area *control = &svm->vmcb->control; |
| |
| svm->vcpu.arch.interrupt_window_open = |
| (!(control->int_state & SVM_INTERRUPT_SHADOW_MASK) && |
| (svm->vmcb->save.rflags & X86_EFLAGS_IF)); |
| |
| if (svm->vcpu.arch.interrupt_window_open && svm->vcpu.arch.irq_summary) |
| /* |
| * If interrupts enabled, and not blocked by sti or mov ss. Good. |
| */ |
| svm_do_inject_vector(svm); |
| |
| /* |
| * Interrupts blocked. Wait for unblock. |
| */ |
| if (!svm->vcpu.arch.interrupt_window_open && |
| (svm->vcpu.arch.irq_summary || kvm_run->request_interrupt_window)) |
| control->intercept |= 1ULL << INTERCEPT_VINTR; |
| else |
| control->intercept &= ~(1ULL << INTERCEPT_VINTR); |
| } |
| |
| static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr) |
| { |
| return 0; |
| } |
| |
| static void save_db_regs(unsigned long *db_regs) |
| { |
| asm volatile ("mov %%dr0, %0" : "=r"(db_regs[0])); |
| asm volatile ("mov %%dr1, %0" : "=r"(db_regs[1])); |
| asm volatile ("mov %%dr2, %0" : "=r"(db_regs[2])); |
| asm volatile ("mov %%dr3, %0" : "=r"(db_regs[3])); |
| } |
| |
| static void load_db_regs(unsigned long *db_regs) |
| { |
| asm volatile ("mov %0, %%dr0" : : "r"(db_regs[0])); |
| asm volatile ("mov %0, %%dr1" : : "r"(db_regs[1])); |
| asm volatile ("mov %0, %%dr2" : : "r"(db_regs[2])); |
| asm volatile ("mov %0, %%dr3" : : "r"(db_regs[3])); |
| } |
| |
| static void svm_flush_tlb(struct kvm_vcpu *vcpu) |
| { |
| force_new_asid(vcpu); |
| } |
| |
| static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu) |
| { |
| } |
| |
| static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| u16 fs_selector; |
| u16 gs_selector; |
| u16 ldt_selector; |
| |
| pre_svm_run(svm); |
| |
| save_host_msrs(vcpu); |
| fs_selector = read_fs(); |
| gs_selector = read_gs(); |
| ldt_selector = read_ldt(); |
| svm->host_cr2 = kvm_read_cr2(); |
| svm->host_dr6 = read_dr6(); |
| svm->host_dr7 = read_dr7(); |
| svm->vmcb->save.cr2 = vcpu->arch.cr2; |
| |
| if (svm->vmcb->save.dr7 & 0xff) { |
| write_dr7(0); |
| save_db_regs(svm->host_db_regs); |
| load_db_regs(svm->db_regs); |
| } |
| |
| clgi(); |
| |
| local_irq_enable(); |
| |
| asm volatile ( |
| #ifdef CONFIG_X86_64 |
| "push %%rbp; \n\t" |
| #else |
| "push %%ebp; \n\t" |
| #endif |
| |
| #ifdef CONFIG_X86_64 |
| "mov %c[rbx](%[svm]), %%rbx \n\t" |
| "mov %c[rcx](%[svm]), %%rcx \n\t" |
| "mov %c[rdx](%[svm]), %%rdx \n\t" |
| "mov %c[rsi](%[svm]), %%rsi \n\t" |
| "mov %c[rdi](%[svm]), %%rdi \n\t" |
| "mov %c[rbp](%[svm]), %%rbp \n\t" |
| "mov %c[r8](%[svm]), %%r8 \n\t" |
| "mov %c[r9](%[svm]), %%r9 \n\t" |
| "mov %c[r10](%[svm]), %%r10 \n\t" |
| "mov %c[r11](%[svm]), %%r11 \n\t" |
| "mov %c[r12](%[svm]), %%r12 \n\t" |
| "mov %c[r13](%[svm]), %%r13 \n\t" |
| "mov %c[r14](%[svm]), %%r14 \n\t" |
| "mov %c[r15](%[svm]), %%r15 \n\t" |
| #else |
| "mov %c[rbx](%[svm]), %%ebx \n\t" |
| "mov %c[rcx](%[svm]), %%ecx \n\t" |
| "mov %c[rdx](%[svm]), %%edx \n\t" |
| "mov %c[rsi](%[svm]), %%esi \n\t" |
| "mov %c[rdi](%[svm]), %%edi \n\t" |
| "mov %c[rbp](%[svm]), %%ebp \n\t" |
| #endif |
| |
| #ifdef CONFIG_X86_64 |
| /* Enter guest mode */ |
| "push %%rax \n\t" |
| "mov %c[vmcb](%[svm]), %%rax \n\t" |
| SVM_VMLOAD "\n\t" |
| SVM_VMRUN "\n\t" |
| SVM_VMSAVE "\n\t" |
| "pop %%rax \n\t" |
| #else |
| /* Enter guest mode */ |
| "push %%eax \n\t" |
| "mov %c[vmcb](%[svm]), %%eax \n\t" |
| SVM_VMLOAD "\n\t" |
| SVM_VMRUN "\n\t" |
| SVM_VMSAVE "\n\t" |
| "pop %%eax \n\t" |
| #endif |
| |
| /* Save guest registers, load host registers */ |
| #ifdef CONFIG_X86_64 |
| "mov %%rbx, %c[rbx](%[svm]) \n\t" |
| "mov %%rcx, %c[rcx](%[svm]) \n\t" |
| "mov %%rdx, %c[rdx](%[svm]) \n\t" |
| "mov %%rsi, %c[rsi](%[svm]) \n\t" |
| "mov %%rdi, %c[rdi](%[svm]) \n\t" |
| "mov %%rbp, %c[rbp](%[svm]) \n\t" |
| "mov %%r8, %c[r8](%[svm]) \n\t" |
| "mov %%r9, %c[r9](%[svm]) \n\t" |
| "mov %%r10, %c[r10](%[svm]) \n\t" |
| "mov %%r11, %c[r11](%[svm]) \n\t" |
| "mov %%r12, %c[r12](%[svm]) \n\t" |
| "mov %%r13, %c[r13](%[svm]) \n\t" |
| "mov %%r14, %c[r14](%[svm]) \n\t" |
| "mov %%r15, %c[r15](%[svm]) \n\t" |
| |
| "pop %%rbp; \n\t" |
| #else |
| "mov %%ebx, %c[rbx](%[svm]) \n\t" |
| "mov %%ecx, %c[rcx](%[svm]) \n\t" |
| "mov %%edx, %c[rdx](%[svm]) \n\t" |
| "mov %%esi, %c[rsi](%[svm]) \n\t" |
| "mov %%edi, %c[rdi](%[svm]) \n\t" |
| "mov %%ebp, %c[rbp](%[svm]) \n\t" |
| |
| "pop %%ebp; \n\t" |
| #endif |
| : |
| : [svm]"a"(svm), |
| [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)), |
| [rbx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBX])), |
| [rcx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RCX])), |
| [rdx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDX])), |
| [rsi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RSI])), |
| [rdi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDI])), |
| [rbp]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBP])) |
| #ifdef CONFIG_X86_64 |
| , [r8]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R8])), |
| [r9]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R9])), |
| [r10]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R10])), |
| [r11]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R11])), |
| [r12]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R12])), |
| [r13]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R13])), |
| [r14]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R14])), |
| [r15]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R15])) |
| #endif |
| : "cc", "memory" |
| #ifdef CONFIG_X86_64 |
| , "rbx", "rcx", "rdx", "rsi", "rdi" |
| , "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15" |
| #else |
| , "ebx", "ecx", "edx" , "esi", "edi" |
| #endif |
| ); |
| |
| if ((svm->vmcb->save.dr7 & 0xff)) |
| load_db_regs(svm->host_db_regs); |
| |
| vcpu->arch.cr2 = svm->vmcb->save.cr2; |
| |
| write_dr6(svm->host_dr6); |
| write_dr7(svm->host_dr7); |
| kvm_write_cr2(svm->host_cr2); |
| |
| load_fs(fs_selector); |
| load_gs(gs_selector); |
| load_ldt(ldt_selector); |
| load_host_msrs(vcpu); |
| |
| reload_tss(vcpu); |
| |
| local_irq_disable(); |
| |
| stgi(); |
| |
| svm->next_rip = 0; |
| } |
| |
| static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root) |
| { |
| struct vcpu_svm *svm = to_svm(vcpu); |
| |
| svm->vmcb->save.cr3 = root; |
| force_new_asid(vcpu); |
| |
| if (vcpu->fpu_active) { |
| svm->vmcb->control.intercept_exceptions |= (1 << NM_VECTOR); |
| svm->vmcb->save.cr0 |= X86_CR0_TS; |
| vcpu->fpu_active = 0; |
| } |
| } |
| |
| static int is_disabled(void) |
| { |
| u64 vm_cr; |
| |
| rdmsrl(MSR_VM_CR, vm_cr); |
| if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE)) |
| return 1; |
| |
| return 0; |
| } |
| |
| static void |
| svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall) |
| { |
| /* |
| * Patch in the VMMCALL instruction: |
| */ |
| hypercall[0] = 0x0f; |
| hypercall[1] = 0x01; |
| hypercall[2] = 0xd9; |
| } |
| |
| static void svm_check_processor_compat(void *rtn) |
| { |
| *(int *)rtn = 0; |
| } |
| |
| static bool svm_cpu_has_accelerated_tpr(void) |
| { |
| return false; |
| } |
| |
| static struct kvm_x86_ops svm_x86_ops = { |
| .cpu_has_kvm_support = has_svm, |
| .disabled_by_bios = is_disabled, |
| .hardware_setup = svm_hardware_setup, |
| .hardware_unsetup = svm_hardware_unsetup, |
| .check_processor_compatibility = svm_check_processor_compat, |
| .hardware_enable = svm_hardware_enable, |
| .hardware_disable = svm_hardware_disable, |
| .cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr, |
| |
| .vcpu_create = svm_create_vcpu, |
| .vcpu_free = svm_free_vcpu, |
| .vcpu_reset = svm_vcpu_reset, |
| |
| .prepare_guest_switch = svm_prepare_guest_switch, |
| .vcpu_load = svm_vcpu_load, |
| .vcpu_put = svm_vcpu_put, |
| .vcpu_decache = svm_vcpu_decache, |
| |
| .set_guest_debug = svm_guest_debug, |
| .get_msr = svm_get_msr, |
| .set_msr = svm_set_msr, |
| .get_segment_base = svm_get_segment_base, |
| .get_segment = svm_get_segment, |
| .set_segment = svm_set_segment, |
| .get_cs_db_l_bits = kvm_get_cs_db_l_bits, |
| .decache_cr4_guest_bits = svm_decache_cr4_guest_bits, |
| .set_cr0 = svm_set_cr0, |
| .set_cr3 = svm_set_cr3, |
| .set_cr4 = svm_set_cr4, |
| .set_efer = svm_set_efer, |
| .get_idt = svm_get_idt, |
| .set_idt = svm_set_idt, |
| .get_gdt = svm_get_gdt, |
| .set_gdt = svm_set_gdt, |
| .get_dr = svm_get_dr, |
| .set_dr = svm_set_dr, |
| .cache_regs = svm_cache_regs, |
| .decache_regs = svm_decache_regs, |
| .get_rflags = svm_get_rflags, |
| .set_rflags = svm_set_rflags, |
| |
| .tlb_flush = svm_flush_tlb, |
| |
| .run = svm_vcpu_run, |
| .handle_exit = handle_exit, |
| .skip_emulated_instruction = skip_emulated_instruction, |
| .patch_hypercall = svm_patch_hypercall, |
| .get_irq = svm_get_irq, |
| .set_irq = svm_set_irq, |
| .queue_exception = svm_queue_exception, |
| .exception_injected = svm_exception_injected, |
| .inject_pending_irq = svm_intr_assist, |
| .inject_pending_vectors = do_interrupt_requests, |
| |
| .set_tss_addr = svm_set_tss_addr, |
| }; |
| |
| static int __init svm_init(void) |
| { |
| return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm), |
| THIS_MODULE); |
| } |
| |
| static void __exit svm_exit(void) |
| { |
| kvm_exit(); |
| } |
| |
| module_init(svm_init) |
| module_exit(svm_exit) |