| /* |
| * 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/module.h> |
| #include <linux/vmalloc.h> |
| #include <linux/highmem.h> |
| #include <linux/profile.h> |
| #include <asm/desc.h> |
| |
| #include "kvm_svm.h" |
| #include "x86_emulate.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 CR4_DE_MASK (1UL << 3) |
| |
| #define SEG_TYPE_LDT 2 |
| #define SEG_TYPE_BUSY_TSS16 3 |
| |
| #define KVM_EFER_LMA (1 << 10) |
| #define KVM_EFER_LME (1 << 8) |
| |
| 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; |
| |
| uint64_t asid_generation; |
| uint32_t max_asid; |
| uint32_t next_asid; |
| struct kvm_ldttss_desc *tss_desc; |
| |
| struct page *save_area; |
| }; |
| |
| static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data); |
| |
| struct svm_init_data { |
| int cpu; |
| int r; |
| }; |
| |
| static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000}; |
| |
| #define NUM_MSR_MAPS (sizeof(msrpm_ranges) / sizeof(*msrpm_ranges)) |
| #define MSRS_RANGE_SIZE 2048 |
| #define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2) |
| |
| #define MAX_INST_SIZE 15 |
| |
| static unsigned get_addr_size(struct kvm_vcpu *vcpu) |
| { |
| struct vmcb_save_area *sa = &vcpu->svm->vmcb->save; |
| u16 cs_attrib; |
| |
| if (!(sa->cr0 & CR0_PE_MASK) || (sa->rflags & X86_EFLAGS_VM)) |
| return 2; |
| |
| cs_attrib = sa->cs.attrib; |
| |
| return (cs_attrib & SVM_SELECTOR_L_MASK) ? 8 : |
| (cs_attrib & SVM_SELECTOR_DB_MASK) ? 4 : 2; |
| } |
| |
| static inline u8 pop_irq(struct kvm_vcpu *vcpu) |
| { |
| int word_index = __ffs(vcpu->irq_summary); |
| int bit_index = __ffs(vcpu->irq_pending[word_index]); |
| int irq = word_index * BITS_PER_LONG + bit_index; |
| |
| clear_bit(bit_index, &vcpu->irq_pending[word_index]); |
| if (!vcpu->irq_pending[word_index]) |
| clear_bit(word_index, &vcpu->irq_summary); |
| return irq; |
| } |
| |
| static inline void push_irq(struct kvm_vcpu *vcpu, u8 irq) |
| { |
| set_bit(irq, vcpu->irq_pending); |
| set_bit(irq / BITS_PER_LONG, &vcpu->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) |
| { |
| vcpu->svm->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 & KVM_EFER_LMA)) |
| efer &= ~KVM_EFER_LME; |
| |
| vcpu->svm->vmcb->save.efer = efer | MSR_EFER_SVME_MASK; |
| vcpu->shadow_efer = efer; |
| } |
| |
| static void svm_inject_gp(struct kvm_vcpu *vcpu, unsigned error_code) |
| { |
| vcpu->svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | |
| SVM_EVTINJ_VALID_ERR | |
| SVM_EVTINJ_TYPE_EXEPT | |
| GP_VECTOR; |
| vcpu->svm->vmcb->control.event_inj_err = error_code; |
| } |
| |
| static void inject_ud(struct kvm_vcpu *vcpu) |
| { |
| vcpu->svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | |
| SVM_EVTINJ_TYPE_EXEPT | |
| UD_VECTOR; |
| } |
| |
| static void inject_db(struct kvm_vcpu *vcpu) |
| { |
| vcpu->svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | |
| SVM_EVTINJ_TYPE_EXEPT | |
| DB_VECTOR; |
| } |
| |
| static int is_page_fault(uint32_t info) |
| { |
| info &= SVM_EVTINJ_VEC_MASK | SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID; |
| return info == (PF_VECTOR | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT); |
| } |
| |
| 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) |
| { |
| if (!vcpu->svm->next_rip) { |
| printk(KERN_DEBUG "%s: NOP\n", __FUNCTION__); |
| return; |
| } |
| if (vcpu->svm->next_rip - vcpu->svm->vmcb->save.rip > 15) { |
| printk(KERN_ERR "%s: ip 0x%llx next 0x%llx\n", |
| __FUNCTION__, |
| vcpu->svm->vmcb->save.rip, |
| vcpu->svm->next_rip); |
| } |
| |
| vcpu->rip = vcpu->svm->vmcb->save.rip = vcpu->svm->next_rip; |
| vcpu->svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK; |
| |
| vcpu->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 Xgt_desc_struct 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 int 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 1; |
| } |
| } |
| printk(KERN_DEBUG "%s: not found 0x%x\n", __FUNCTION__, msr); |
| return 0; |
| } |
| |
| static __init int svm_hardware_setup(void) |
| { |
| int cpu; |
| struct page *iopm_pages; |
| struct page *msrpm_pages; |
| void *msrpm_va; |
| int r; |
| |
| kvm_emulator_want_group7_invlpg(); |
| |
| iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER); |
| |
| if (!iopm_pages) |
| return -ENOMEM; |
| memset(page_address(iopm_pages), 0xff, |
| PAGE_SIZE * (1 << IOPM_ALLOC_ORDER)); |
| 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); |
| |
| for_each_online_cpu(cpu) { |
| r = svm_cpu_init(cpu); |
| if (r) |
| goto err_2; |
| } |
| 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 int svm_vcpu_setup(struct kvm_vcpu *vcpu) |
| { |
| return 0; |
| } |
| |
| static void init_vmcb(struct vmcb *vmcb) |
| { |
| struct vmcb_control_area *control = &vmcb->control; |
| struct vmcb_save_area *save = &vmcb->save; |
| u64 tsc; |
| |
| control->intercept_cr_read = INTERCEPT_CR0_MASK | |
| INTERCEPT_CR3_MASK | |
| INTERCEPT_CR4_MASK; |
| |
| control->intercept_cr_write = INTERCEPT_CR0_MASK | |
| INTERCEPT_CR3_MASK | |
| INTERCEPT_CR4_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; |
| |
| |
| control->intercept = (1ULL << INTERCEPT_INTR) | |
| (1ULL << INTERCEPT_NMI) | |
| /* |
| * 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_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); |
| |
| control->iopm_base_pa = iopm_base; |
| control->msrpm_base_pa = msrpm_base; |
| rdtscll(tsc); |
| control->tsc_offset = -tsc; |
| 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; |
| save->cs.base = 0xffff0000; |
| |
| 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 | CR0_PG_MASK; |
| save->cr4 = CR4_PAE_MASK; |
| /* rdx = ?? */ |
| } |
| |
| static int svm_create_vcpu(struct kvm_vcpu *vcpu) |
| { |
| struct page *page; |
| int r; |
| |
| r = -ENOMEM; |
| vcpu->svm = kzalloc(sizeof *vcpu->svm, GFP_KERNEL); |
| if (!vcpu->svm) |
| goto out1; |
| page = alloc_page(GFP_KERNEL); |
| if (!page) |
| goto out2; |
| |
| vcpu->svm->vmcb = page_address(page); |
| memset(vcpu->svm->vmcb, 0, PAGE_SIZE); |
| vcpu->svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT; |
| vcpu->svm->cr0 = 0x00000010; |
| vcpu->svm->asid_generation = 0; |
| memset(vcpu->svm->db_regs, 0, sizeof(vcpu->svm->db_regs)); |
| init_vmcb(vcpu->svm->vmcb); |
| |
| fx_init(vcpu); |
| |
| return 0; |
| |
| out2: |
| kfree(vcpu->svm); |
| out1: |
| return r; |
| } |
| |
| static void svm_free_vcpu(struct kvm_vcpu *vcpu) |
| { |
| if (!vcpu->svm) |
| return; |
| if (vcpu->svm->vmcb) |
| __free_page(pfn_to_page(vcpu->svm->vmcb_pa >> PAGE_SHIFT)); |
| kfree(vcpu->svm); |
| } |
| |
| static struct kvm_vcpu *svm_vcpu_load(struct kvm_vcpu *vcpu) |
| { |
| get_cpu(); |
| return vcpu; |
| } |
| |
| static void svm_vcpu_put(struct kvm_vcpu *vcpu) |
| { |
| put_cpu(); |
| } |
| |
| static void svm_cache_regs(struct kvm_vcpu *vcpu) |
| { |
| vcpu->regs[VCPU_REGS_RAX] = vcpu->svm->vmcb->save.rax; |
| vcpu->regs[VCPU_REGS_RSP] = vcpu->svm->vmcb->save.rsp; |
| vcpu->rip = vcpu->svm->vmcb->save.rip; |
| } |
| |
| static void svm_decache_regs(struct kvm_vcpu *vcpu) |
| { |
| vcpu->svm->vmcb->save.rax = vcpu->regs[VCPU_REGS_RAX]; |
| vcpu->svm->vmcb->save.rsp = vcpu->regs[VCPU_REGS_RSP]; |
| vcpu->svm->vmcb->save.rip = vcpu->rip; |
| } |
| |
| static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->svm->vmcb->save.rflags; |
| } |
| |
| static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) |
| { |
| vcpu->svm->vmcb->save.rflags = rflags; |
| } |
| |
| static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg) |
| { |
| struct vmcb_save_area *save = &vcpu->svm->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_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) |
| { |
| struct vmcb_seg *s = svm_seg(vcpu, VCPU_SREG_CS); |
| |
| *db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1; |
| *l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1; |
| } |
| |
| static void svm_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| { |
| dt->limit = vcpu->svm->vmcb->save.idtr.limit; |
| dt->base = vcpu->svm->vmcb->save.idtr.base; |
| } |
| |
| static void svm_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| { |
| vcpu->svm->vmcb->save.idtr.limit = dt->limit; |
| vcpu->svm->vmcb->save.idtr.base = dt->base ; |
| } |
| |
| static void svm_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| { |
| dt->limit = vcpu->svm->vmcb->save.gdtr.limit; |
| dt->base = vcpu->svm->vmcb->save.gdtr.base; |
| } |
| |
| static void svm_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| { |
| vcpu->svm->vmcb->save.gdtr.limit = dt->limit; |
| vcpu->svm->vmcb->save.gdtr.base = dt->base ; |
| } |
| |
| static void svm_decache_cr0_cr4_guest_bits(struct kvm_vcpu *vcpu) |
| { |
| } |
| |
| static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) |
| { |
| #ifdef CONFIG_X86_64 |
| if (vcpu->shadow_efer & KVM_EFER_LME) { |
| if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) { |
| vcpu->shadow_efer |= KVM_EFER_LMA; |
| vcpu->svm->vmcb->save.efer |= KVM_EFER_LMA | KVM_EFER_LME; |
| } |
| |
| if (is_paging(vcpu) && !(cr0 & CR0_PG_MASK) ) { |
| vcpu->shadow_efer &= ~KVM_EFER_LMA; |
| vcpu->svm->vmcb->save.efer &= ~(KVM_EFER_LMA | KVM_EFER_LME); |
| } |
| } |
| #endif |
| vcpu->svm->cr0 = cr0; |
| vcpu->svm->vmcb->save.cr0 = cr0 | CR0_PG_MASK | CR0_WP_MASK; |
| vcpu->cr0 = cr0; |
| } |
| |
| static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) |
| { |
| vcpu->cr4 = cr4; |
| vcpu->svm->vmcb->save.cr4 = cr4 | CR4_PAE_MASK; |
| } |
| |
| static void svm_set_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg) |
| { |
| 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) |
| vcpu->svm->vmcb->save.cpl |
| = (vcpu->svm->vmcb->save.cs.attrib |
| >> SVM_SELECTOR_DPL_SHIFT) & 3; |
| |
| } |
| |
| /* FIXME: |
| |
| vcpu->svm->vmcb->control.int_ctl &= ~V_TPR_MASK; |
| vcpu->svm->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 void load_host_msrs(struct kvm_vcpu *vcpu) |
| { |
| int i; |
| |
| for ( i = 0; i < NR_HOST_SAVE_MSRS; i++) |
| wrmsrl(host_save_msrs[i], vcpu->svm->host_msrs[i]); |
| } |
| |
| static void save_host_msrs(struct kvm_vcpu *vcpu) |
| { |
| int i; |
| |
| for ( i = 0; i < NR_HOST_SAVE_MSRS; i++) |
| rdmsrl(host_save_msrs[i], vcpu->svm->host_msrs[i]); |
| } |
| |
| static void new_asid(struct kvm_vcpu *vcpu, struct svm_cpu_data *svm_data) |
| { |
| if (svm_data->next_asid > svm_data->max_asid) { |
| ++svm_data->asid_generation; |
| svm_data->next_asid = 1; |
| vcpu->svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID; |
| } |
| |
| vcpu->cpu = svm_data->cpu; |
| vcpu->svm->asid_generation = svm_data->asid_generation; |
| vcpu->svm->vmcb->control.asid = svm_data->next_asid++; |
| } |
| |
| static void svm_invlpg(struct kvm_vcpu *vcpu, gva_t address) |
| { |
| invlpga(address, vcpu->svm->vmcb->control.asid); // is needed? |
| } |
| |
| static unsigned long svm_get_dr(struct kvm_vcpu *vcpu, int dr) |
| { |
| return vcpu->svm->db_regs[dr]; |
| } |
| |
| static void svm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long value, |
| int *exception) |
| { |
| *exception = 0; |
| |
| if (vcpu->svm->vmcb->save.dr7 & DR7_GD_MASK) { |
| vcpu->svm->vmcb->save.dr7 &= ~DR7_GD_MASK; |
| vcpu->svm->vmcb->save.dr6 |= DR6_BD_MASK; |
| *exception = DB_VECTOR; |
| return; |
| } |
| |
| switch (dr) { |
| case 0 ... 3: |
| vcpu->svm->db_regs[dr] = value; |
| return; |
| case 4 ... 5: |
| if (vcpu->cr4 & CR4_DE_MASK) { |
| *exception = UD_VECTOR; |
| return; |
| } |
| case 7: { |
| if (value & ~((1ULL << 32) - 1)) { |
| *exception = GP_VECTOR; |
| return; |
| } |
| vcpu->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 kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| u32 exit_int_info = vcpu->svm->vmcb->control.exit_int_info; |
| u64 fault_address; |
| u32 error_code; |
| enum emulation_result er; |
| int r; |
| |
| if (is_external_interrupt(exit_int_info)) |
| push_irq(vcpu, exit_int_info & SVM_EVTINJ_VEC_MASK); |
| |
| spin_lock(&vcpu->kvm->lock); |
| |
| fault_address = vcpu->svm->vmcb->control.exit_info_2; |
| error_code = vcpu->svm->vmcb->control.exit_info_1; |
| r = kvm_mmu_page_fault(vcpu, fault_address, error_code); |
| if (r < 0) { |
| spin_unlock(&vcpu->kvm->lock); |
| return r; |
| } |
| if (!r) { |
| spin_unlock(&vcpu->kvm->lock); |
| return 1; |
| } |
| er = emulate_instruction(vcpu, kvm_run, fault_address, error_code); |
| spin_unlock(&vcpu->kvm->lock); |
| |
| switch (er) { |
| case EMULATE_DONE: |
| return 1; |
| case EMULATE_DO_MMIO: |
| ++kvm_stat.mmio_exits; |
| kvm_run->exit_reason = KVM_EXIT_MMIO; |
| return 0; |
| case EMULATE_FAIL: |
| vcpu_printf(vcpu, "%s: emulate fail\n", __FUNCTION__); |
| break; |
| default: |
| BUG(); |
| } |
| |
| kvm_run->exit_reason = KVM_EXIT_UNKNOWN; |
| return 0; |
| } |
| |
| static int shutdown_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| /* |
| * VMCB is undefined after a SHUTDOWN intercept |
| * so reinitialize it. |
| */ |
| memset(vcpu->svm->vmcb, 0, PAGE_SIZE); |
| init_vmcb(vcpu->svm->vmcb); |
| |
| kvm_run->exit_reason = KVM_EXIT_SHUTDOWN; |
| return 0; |
| } |
| |
| static int io_get_override(struct kvm_vcpu *vcpu, |
| struct vmcb_seg **seg, |
| int *addr_override) |
| { |
| u8 inst[MAX_INST_SIZE]; |
| unsigned ins_length; |
| gva_t rip; |
| int i; |
| |
| rip = vcpu->svm->vmcb->save.rip; |
| ins_length = vcpu->svm->next_rip - rip; |
| rip += vcpu->svm->vmcb->save.cs.base; |
| |
| if (ins_length > MAX_INST_SIZE) |
| printk(KERN_DEBUG |
| "%s: inst length err, cs base 0x%llx rip 0x%llx " |
| "next rip 0x%llx ins_length %u\n", |
| __FUNCTION__, |
| vcpu->svm->vmcb->save.cs.base, |
| vcpu->svm->vmcb->save.rip, |
| vcpu->svm->vmcb->control.exit_info_2, |
| ins_length); |
| |
| if (kvm_read_guest(vcpu, rip, ins_length, inst) != ins_length) |
| /* #PF */ |
| return 0; |
| |
| *addr_override = 0; |
| *seg = NULL; |
| for (i = 0; i < ins_length; i++) |
| switch (inst[i]) { |
| case 0xf0: |
| case 0xf2: |
| case 0xf3: |
| case 0x66: |
| continue; |
| case 0x67: |
| *addr_override = 1; |
| continue; |
| case 0x2e: |
| *seg = &vcpu->svm->vmcb->save.cs; |
| continue; |
| case 0x36: |
| *seg = &vcpu->svm->vmcb->save.ss; |
| continue; |
| case 0x3e: |
| *seg = &vcpu->svm->vmcb->save.ds; |
| continue; |
| case 0x26: |
| *seg = &vcpu->svm->vmcb->save.es; |
| continue; |
| case 0x64: |
| *seg = &vcpu->svm->vmcb->save.fs; |
| continue; |
| case 0x65: |
| *seg = &vcpu->svm->vmcb->save.gs; |
| continue; |
| default: |
| return 1; |
| } |
| printk(KERN_DEBUG "%s: unexpected\n", __FUNCTION__); |
| return 0; |
| } |
| |
| static unsigned long io_adress(struct kvm_vcpu *vcpu, int ins, u64 *address) |
| { |
| unsigned long addr_mask; |
| unsigned long *reg; |
| struct vmcb_seg *seg; |
| int addr_override; |
| struct vmcb_save_area *save_area = &vcpu->svm->vmcb->save; |
| u16 cs_attrib = save_area->cs.attrib; |
| unsigned addr_size = get_addr_size(vcpu); |
| |
| if (!io_get_override(vcpu, &seg, &addr_override)) |
| return 0; |
| |
| if (addr_override) |
| addr_size = (addr_size == 2) ? 4: (addr_size >> 1); |
| |
| if (ins) { |
| reg = &vcpu->regs[VCPU_REGS_RDI]; |
| seg = &vcpu->svm->vmcb->save.es; |
| } else { |
| reg = &vcpu->regs[VCPU_REGS_RSI]; |
| seg = (seg) ? seg : &vcpu->svm->vmcb->save.ds; |
| } |
| |
| addr_mask = ~0ULL >> (64 - (addr_size * 8)); |
| |
| if ((cs_attrib & SVM_SELECTOR_L_MASK) && |
| !(vcpu->svm->vmcb->save.rflags & X86_EFLAGS_VM)) { |
| *address = (*reg & addr_mask); |
| return addr_mask; |
| } |
| |
| if (!(seg->attrib & SVM_SELECTOR_P_SHIFT)) { |
| svm_inject_gp(vcpu, 0); |
| return 0; |
| } |
| |
| *address = (*reg & addr_mask) + seg->base; |
| return addr_mask; |
| } |
| |
| static int io_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| u32 io_info = vcpu->svm->vmcb->control.exit_info_1; //address size bug? |
| int _in = io_info & SVM_IOIO_TYPE_MASK; |
| |
| ++kvm_stat.io_exits; |
| |
| vcpu->svm->next_rip = vcpu->svm->vmcb->control.exit_info_2; |
| |
| kvm_run->exit_reason = KVM_EXIT_IO; |
| kvm_run->io.port = io_info >> 16; |
| kvm_run->io.direction = (_in) ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; |
| kvm_run->io.size = ((io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT); |
| kvm_run->io.string = (io_info & SVM_IOIO_STR_MASK) != 0; |
| kvm_run->io.rep = (io_info & SVM_IOIO_REP_MASK) != 0; |
| |
| if (kvm_run->io.string) { |
| unsigned addr_mask; |
| |
| addr_mask = io_adress(vcpu, _in, &kvm_run->io.address); |
| if (!addr_mask) { |
| printk(KERN_DEBUG "%s: get io address failed\n", __FUNCTION__); |
| return 1; |
| } |
| |
| if (kvm_run->io.rep) { |
| kvm_run->io.count = vcpu->regs[VCPU_REGS_RCX] & addr_mask; |
| kvm_run->io.string_down = (vcpu->svm->vmcb->save.rflags |
| & X86_EFLAGS_DF) != 0; |
| } |
| } else { |
| kvm_run->io.value = vcpu->svm->vmcb->save.rax; |
| } |
| return 0; |
| } |
| |
| |
| static int nop_on_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| return 1; |
| } |
| |
| static int halt_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| vcpu->svm->next_rip = vcpu->svm->vmcb->save.rip + 1; |
| skip_emulated_instruction(vcpu); |
| if (vcpu->irq_summary) |
| return 1; |
| |
| kvm_run->exit_reason = KVM_EXIT_HLT; |
| ++kvm_stat.halt_exits; |
| return 0; |
| } |
| |
| static int invalid_op_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| inject_ud(vcpu); |
| return 1; |
| } |
| |
| static int task_switch_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| printk(KERN_DEBUG "%s: task swiche is unsupported\n", __FUNCTION__); |
| kvm_run->exit_reason = KVM_EXIT_UNKNOWN; |
| return 0; |
| } |
| |
| static int cpuid_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| vcpu->svm->next_rip = vcpu->svm->vmcb->save.rip + 2; |
| kvm_run->exit_reason = KVM_EXIT_CPUID; |
| return 0; |
| } |
| |
| static int emulate_on_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| if (emulate_instruction(vcpu, NULL, 0, 0) != EMULATE_DONE) |
| printk(KERN_ERR "%s: failed\n", __FUNCTION__); |
| return 1; |
| } |
| |
| static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data) |
| { |
| switch (ecx) { |
| case MSR_IA32_TIME_STAMP_COUNTER: { |
| u64 tsc; |
| |
| rdtscll(tsc); |
| *data = vcpu->svm->vmcb->control.tsc_offset + tsc; |
| break; |
| } |
| case MSR_K6_STAR: |
| *data = vcpu->svm->vmcb->save.star; |
| break; |
| #ifdef CONFIG_X86_64 |
| case MSR_LSTAR: |
| *data = vcpu->svm->vmcb->save.lstar; |
| break; |
| case MSR_CSTAR: |
| *data = vcpu->svm->vmcb->save.cstar; |
| break; |
| case MSR_KERNEL_GS_BASE: |
| *data = vcpu->svm->vmcb->save.kernel_gs_base; |
| break; |
| case MSR_SYSCALL_MASK: |
| *data = vcpu->svm->vmcb->save.sfmask; |
| break; |
| #endif |
| case MSR_IA32_SYSENTER_CS: |
| *data = vcpu->svm->vmcb->save.sysenter_cs; |
| break; |
| case MSR_IA32_SYSENTER_EIP: |
| *data = vcpu->svm->vmcb->save.sysenter_eip; |
| break; |
| case MSR_IA32_SYSENTER_ESP: |
| *data = vcpu->svm->vmcb->save.sysenter_esp; |
| break; |
| default: |
| return kvm_get_msr_common(vcpu, ecx, data); |
| } |
| return 0; |
| } |
| |
| static int rdmsr_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| u32 ecx = vcpu->regs[VCPU_REGS_RCX]; |
| u64 data; |
| |
| if (svm_get_msr(vcpu, ecx, &data)) |
| svm_inject_gp(vcpu, 0); |
| else { |
| vcpu->svm->vmcb->save.rax = data & 0xffffffff; |
| vcpu->regs[VCPU_REGS_RDX] = data >> 32; |
| vcpu->svm->next_rip = vcpu->svm->vmcb->save.rip + 2; |
| skip_emulated_instruction(vcpu); |
| } |
| return 1; |
| } |
| |
| static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data) |
| { |
| switch (ecx) { |
| case MSR_IA32_TIME_STAMP_COUNTER: { |
| u64 tsc; |
| |
| rdtscll(tsc); |
| vcpu->svm->vmcb->control.tsc_offset = data - tsc; |
| break; |
| } |
| case MSR_K6_STAR: |
| vcpu->svm->vmcb->save.star = data; |
| break; |
| #ifdef CONFIG_X86_64 |
| case MSR_LSTAR: |
| vcpu->svm->vmcb->save.lstar = data; |
| break; |
| case MSR_CSTAR: |
| vcpu->svm->vmcb->save.cstar = data; |
| break; |
| case MSR_KERNEL_GS_BASE: |
| vcpu->svm->vmcb->save.kernel_gs_base = data; |
| break; |
| case MSR_SYSCALL_MASK: |
| vcpu->svm->vmcb->save.sfmask = data; |
| break; |
| #endif |
| case MSR_IA32_SYSENTER_CS: |
| vcpu->svm->vmcb->save.sysenter_cs = data; |
| break; |
| case MSR_IA32_SYSENTER_EIP: |
| vcpu->svm->vmcb->save.sysenter_eip = data; |
| break; |
| case MSR_IA32_SYSENTER_ESP: |
| vcpu->svm->vmcb->save.sysenter_esp = data; |
| break; |
| default: |
| return kvm_set_msr_common(vcpu, ecx, data); |
| } |
| return 0; |
| } |
| |
| static int wrmsr_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| u32 ecx = vcpu->regs[VCPU_REGS_RCX]; |
| u64 data = (vcpu->svm->vmcb->save.rax & -1u) |
| | ((u64)(vcpu->regs[VCPU_REGS_RDX] & -1u) << 32); |
| vcpu->svm->next_rip = vcpu->svm->vmcb->save.rip + 2; |
| if (svm_set_msr(vcpu, ecx, data)) |
| svm_inject_gp(vcpu, 0); |
| else |
| skip_emulated_instruction(vcpu); |
| return 1; |
| } |
| |
| static int msr_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| if (vcpu->svm->vmcb->control.exit_info_1) |
| return wrmsr_interception(vcpu, kvm_run); |
| else |
| return rdmsr_interception(vcpu, kvm_run); |
| } |
| |
| static int interrupt_window_interception(struct kvm_vcpu *vcpu, |
| struct kvm_run *kvm_run) |
| { |
| /* |
| * If the user space waits to inject interrupts, exit as soon as |
| * possible |
| */ |
| if (kvm_run->request_interrupt_window && |
| !vcpu->irq_summary) { |
| ++kvm_stat.irq_window_exits; |
| kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int (*svm_exit_handlers[])(struct kvm_vcpu *vcpu, |
| 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, |
| /* 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_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 + PF_VECTOR] = pf_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_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] = invalid_op_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, |
| }; |
| |
| |
| static int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| u32 exit_code = vcpu->svm->vmcb->control.exit_code; |
| |
| kvm_run->exit_type = KVM_EXIT_TYPE_VM_EXIT; |
| |
| if (is_external_interrupt(vcpu->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__, vcpu->svm->vmcb->control.exit_int_info, |
| exit_code); |
| |
| if (exit_code >= sizeof(svm_exit_handlers) / sizeof(*svm_exit_handlers) |
| || svm_exit_handlers[exit_code] == 0) { |
| kvm_run->exit_reason = KVM_EXIT_UNKNOWN; |
| printk(KERN_ERR "%s: 0x%x @ 0x%llx cr0 0x%lx rflags 0x%llx\n", |
| __FUNCTION__, |
| exit_code, |
| vcpu->svm->vmcb->save.rip, |
| vcpu->cr0, |
| vcpu->svm->vmcb->save.rflags); |
| return 0; |
| } |
| |
| return svm_exit_handlers[exit_code](vcpu, 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 kvm_vcpu *vcpu) |
| { |
| int cpu = raw_smp_processor_id(); |
| |
| struct svm_cpu_data *svm_data = per_cpu(svm_data, cpu); |
| |
| vcpu->svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING; |
| if (vcpu->cpu != cpu || |
| vcpu->svm->asid_generation != svm_data->asid_generation) |
| new_asid(vcpu, svm_data); |
| } |
| |
| |
| static inline void kvm_do_inject_irq(struct kvm_vcpu *vcpu) |
| { |
| struct vmcb_control_area *control; |
| |
| control = &vcpu->svm->vmcb->control; |
| control->int_vector = pop_irq(vcpu); |
| control->int_ctl &= ~V_INTR_PRIO_MASK; |
| control->int_ctl |= V_IRQ_MASK | |
| ((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT); |
| } |
| |
| static void kvm_reput_irq(struct kvm_vcpu *vcpu) |
| { |
| struct vmcb_control_area *control = &vcpu->svm->vmcb->control; |
| |
| if (control->int_ctl & V_IRQ_MASK) { |
| control->int_ctl &= ~V_IRQ_MASK; |
| push_irq(vcpu, control->int_vector); |
| } |
| |
| vcpu->interrupt_window_open = |
| !(control->int_state & SVM_INTERRUPT_SHADOW_MASK); |
| } |
| |
| static void do_interrupt_requests(struct kvm_vcpu *vcpu, |
| struct kvm_run *kvm_run) |
| { |
| struct vmcb_control_area *control = &vcpu->svm->vmcb->control; |
| |
| vcpu->interrupt_window_open = |
| (!(control->int_state & SVM_INTERRUPT_SHADOW_MASK) && |
| (vcpu->svm->vmcb->save.rflags & X86_EFLAGS_IF)); |
| |
| if (vcpu->interrupt_window_open && vcpu->irq_summary) |
| /* |
| * If interrupts enabled, and not blocked by sti or mov ss. Good. |
| */ |
| kvm_do_inject_irq(vcpu); |
| |
| /* |
| * Interrupts blocked. Wait for unblock. |
| */ |
| if (!vcpu->interrupt_window_open && |
| (vcpu->irq_summary || kvm_run->request_interrupt_window)) { |
| control->intercept |= 1ULL << INTERCEPT_VINTR; |
| } else |
| control->intercept &= ~(1ULL << INTERCEPT_VINTR); |
| } |
| |
| static void post_kvm_run_save(struct kvm_vcpu *vcpu, |
| struct kvm_run *kvm_run) |
| { |
| kvm_run->ready_for_interrupt_injection = (vcpu->interrupt_window_open && |
| vcpu->irq_summary == 0); |
| kvm_run->if_flag = (vcpu->svm->vmcb->save.rflags & X86_EFLAGS_IF) != 0; |
| kvm_run->cr8 = vcpu->cr8; |
| kvm_run->apic_base = vcpu->apic_base; |
| } |
| |
| /* |
| * Check if userspace requested an interrupt window, and that the |
| * interrupt window is open. |
| * |
| * No need to exit to userspace if we already have an interrupt queued. |
| */ |
| static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu, |
| struct kvm_run *kvm_run) |
| { |
| return (!vcpu->irq_summary && |
| kvm_run->request_interrupt_window && |
| vcpu->interrupt_window_open && |
| (vcpu->svm->vmcb->save.rflags & X86_EFLAGS_IF)); |
| } |
| |
| 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 int svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| { |
| u16 fs_selector; |
| u16 gs_selector; |
| u16 ldt_selector; |
| int r; |
| |
| again: |
| if (!vcpu->mmio_read_completed) |
| do_interrupt_requests(vcpu, kvm_run); |
| |
| clgi(); |
| |
| pre_svm_run(vcpu); |
| |
| save_host_msrs(vcpu); |
| fs_selector = read_fs(); |
| gs_selector = read_gs(); |
| ldt_selector = read_ldt(); |
| vcpu->svm->host_cr2 = kvm_read_cr2(); |
| vcpu->svm->host_dr6 = read_dr6(); |
| vcpu->svm->host_dr7 = read_dr7(); |
| vcpu->svm->vmcb->save.cr2 = vcpu->cr2; |
| |
| if (vcpu->svm->vmcb->save.dr7 & 0xff) { |
| write_dr7(0); |
| save_db_regs(vcpu->svm->host_db_regs); |
| load_db_regs(vcpu->svm->db_regs); |
| } |
| |
| fx_save(vcpu->host_fx_image); |
| fx_restore(vcpu->guest_fx_image); |
| |
| asm volatile ( |
| #ifdef CONFIG_X86_64 |
| "push %%rbx; push %%rcx; push %%rdx;" |
| "push %%rsi; push %%rdi; push %%rbp;" |
| "push %%r8; push %%r9; push %%r10; push %%r11;" |
| "push %%r12; push %%r13; push %%r14; push %%r15;" |
| #else |
| "push %%ebx; push %%ecx; push %%edx;" |
| "push %%esi; push %%edi; push %%ebp;" |
| #endif |
| |
| #ifdef CONFIG_X86_64 |
| "mov %c[rbx](%[vcpu]), %%rbx \n\t" |
| "mov %c[rcx](%[vcpu]), %%rcx \n\t" |
| "mov %c[rdx](%[vcpu]), %%rdx \n\t" |
| "mov %c[rsi](%[vcpu]), %%rsi \n\t" |
| "mov %c[rdi](%[vcpu]), %%rdi \n\t" |
| "mov %c[rbp](%[vcpu]), %%rbp \n\t" |
| "mov %c[r8](%[vcpu]), %%r8 \n\t" |
| "mov %c[r9](%[vcpu]), %%r9 \n\t" |
| "mov %c[r10](%[vcpu]), %%r10 \n\t" |
| "mov %c[r11](%[vcpu]), %%r11 \n\t" |
| "mov %c[r12](%[vcpu]), %%r12 \n\t" |
| "mov %c[r13](%[vcpu]), %%r13 \n\t" |
| "mov %c[r14](%[vcpu]), %%r14 \n\t" |
| "mov %c[r15](%[vcpu]), %%r15 \n\t" |
| #else |
| "mov %c[rbx](%[vcpu]), %%ebx \n\t" |
| "mov %c[rcx](%[vcpu]), %%ecx \n\t" |
| "mov %c[rdx](%[vcpu]), %%edx \n\t" |
| "mov %c[rsi](%[vcpu]), %%esi \n\t" |
| "mov %c[rdi](%[vcpu]), %%edi \n\t" |
| "mov %c[rbp](%[vcpu]), %%ebp \n\t" |
| #endif |
| |
| #ifdef CONFIG_X86_64 |
| /* Enter guest mode */ |
| "push %%rax \n\t" |
| "mov %c[svm](%[vcpu]), %%rax \n\t" |
| "mov %c[vmcb](%%rax), %%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[svm](%[vcpu]), %%eax \n\t" |
| "mov %c[vmcb](%%eax), %%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](%[vcpu]) \n\t" |
| "mov %%rcx, %c[rcx](%[vcpu]) \n\t" |
| "mov %%rdx, %c[rdx](%[vcpu]) \n\t" |
| "mov %%rsi, %c[rsi](%[vcpu]) \n\t" |
| "mov %%rdi, %c[rdi](%[vcpu]) \n\t" |
| "mov %%rbp, %c[rbp](%[vcpu]) \n\t" |
| "mov %%r8, %c[r8](%[vcpu]) \n\t" |
| "mov %%r9, %c[r9](%[vcpu]) \n\t" |
| "mov %%r10, %c[r10](%[vcpu]) \n\t" |
| "mov %%r11, %c[r11](%[vcpu]) \n\t" |
| "mov %%r12, %c[r12](%[vcpu]) \n\t" |
| "mov %%r13, %c[r13](%[vcpu]) \n\t" |
| "mov %%r14, %c[r14](%[vcpu]) \n\t" |
| "mov %%r15, %c[r15](%[vcpu]) \n\t" |
| |
| "pop %%r15; pop %%r14; pop %%r13; pop %%r12;" |
| "pop %%r11; pop %%r10; pop %%r9; pop %%r8;" |
| "pop %%rbp; pop %%rdi; pop %%rsi;" |
| "pop %%rdx; pop %%rcx; pop %%rbx; \n\t" |
| #else |
| "mov %%ebx, %c[rbx](%[vcpu]) \n\t" |
| "mov %%ecx, %c[rcx](%[vcpu]) \n\t" |
| "mov %%edx, %c[rdx](%[vcpu]) \n\t" |
| "mov %%esi, %c[rsi](%[vcpu]) \n\t" |
| "mov %%edi, %c[rdi](%[vcpu]) \n\t" |
| "mov %%ebp, %c[rbp](%[vcpu]) \n\t" |
| |
| "pop %%ebp; pop %%edi; pop %%esi;" |
| "pop %%edx; pop %%ecx; pop %%ebx; \n\t" |
| #endif |
| : |
| : [vcpu]"a"(vcpu), |
| [svm]"i"(offsetof(struct kvm_vcpu, svm)), |
| [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)), |
| [rbx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBX])), |
| [rcx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RCX])), |
| [rdx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDX])), |
| [rsi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RSI])), |
| [rdi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDI])), |
| [rbp]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBP])) |
| #ifdef CONFIG_X86_64 |
| ,[r8 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R8 ])), |
| [r9 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R9 ])), |
| [r10]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R10])), |
| [r11]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R11])), |
| [r12]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R12])), |
| [r13]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R13])), |
| [r14]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R14])), |
| [r15]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R15])) |
| #endif |
| : "cc", "memory" ); |
| |
| fx_save(vcpu->guest_fx_image); |
| fx_restore(vcpu->host_fx_image); |
| |
| if ((vcpu->svm->vmcb->save.dr7 & 0xff)) |
| load_db_regs(vcpu->svm->host_db_regs); |
| |
| vcpu->cr2 = vcpu->svm->vmcb->save.cr2; |
| |
| write_dr6(vcpu->svm->host_dr6); |
| write_dr7(vcpu->svm->host_dr7); |
| kvm_write_cr2(vcpu->svm->host_cr2); |
| |
| load_fs(fs_selector); |
| load_gs(gs_selector); |
| load_ldt(ldt_selector); |
| load_host_msrs(vcpu); |
| |
| reload_tss(vcpu); |
| |
| /* |
| * Profile KVM exit RIPs: |
| */ |
| if (unlikely(prof_on == KVM_PROFILING)) |
| profile_hit(KVM_PROFILING, |
| (void *)(unsigned long)vcpu->svm->vmcb->save.rip); |
| |
| stgi(); |
| |
| kvm_reput_irq(vcpu); |
| |
| vcpu->svm->next_rip = 0; |
| |
| if (vcpu->svm->vmcb->control.exit_code == SVM_EXIT_ERR) { |
| kvm_run->exit_type = KVM_EXIT_TYPE_FAIL_ENTRY; |
| kvm_run->exit_reason = vcpu->svm->vmcb->control.exit_code; |
| post_kvm_run_save(vcpu, kvm_run); |
| return 0; |
| } |
| |
| r = handle_exit(vcpu, kvm_run); |
| if (r > 0) { |
| if (signal_pending(current)) { |
| ++kvm_stat.signal_exits; |
| post_kvm_run_save(vcpu, kvm_run); |
| return -EINTR; |
| } |
| |
| if (dm_request_for_irq_injection(vcpu, kvm_run)) { |
| ++kvm_stat.request_irq_exits; |
| post_kvm_run_save(vcpu, kvm_run); |
| return -EINTR; |
| } |
| kvm_resched(vcpu); |
| goto again; |
| } |
| post_kvm_run_save(vcpu, kvm_run); |
| return r; |
| } |
| |
| static void svm_flush_tlb(struct kvm_vcpu *vcpu) |
| { |
| force_new_asid(vcpu); |
| } |
| |
| static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root) |
| { |
| vcpu->svm->vmcb->save.cr3 = root; |
| force_new_asid(vcpu); |
| } |
| |
| static void svm_inject_page_fault(struct kvm_vcpu *vcpu, |
| unsigned long addr, |
| uint32_t err_code) |
| { |
| uint32_t exit_int_info = vcpu->svm->vmcb->control.exit_int_info; |
| |
| ++kvm_stat.pf_guest; |
| |
| if (is_page_fault(exit_int_info)) { |
| |
| vcpu->svm->vmcb->control.event_inj_err = 0; |
| vcpu->svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | |
| SVM_EVTINJ_VALID_ERR | |
| SVM_EVTINJ_TYPE_EXEPT | |
| DF_VECTOR; |
| return; |
| } |
| vcpu->cr2 = addr; |
| vcpu->svm->vmcb->save.cr2 = addr; |
| vcpu->svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | |
| SVM_EVTINJ_VALID_ERR | |
| SVM_EVTINJ_TYPE_EXEPT | |
| PF_VECTOR; |
| vcpu->svm->vmcb->control.event_inj_err = err_code; |
| } |
| |
| |
| static int is_disabled(void) |
| { |
| return 0; |
| } |
| |
| static struct kvm_arch_ops svm_arch_ops = { |
| .cpu_has_kvm_support = has_svm, |
| .disabled_by_bios = is_disabled, |
| .hardware_setup = svm_hardware_setup, |
| .hardware_unsetup = svm_hardware_unsetup, |
| .hardware_enable = svm_hardware_enable, |
| .hardware_disable = svm_hardware_disable, |
| |
| .vcpu_create = svm_create_vcpu, |
| .vcpu_free = svm_free_vcpu, |
| |
| .vcpu_load = svm_vcpu_load, |
| .vcpu_put = svm_vcpu_put, |
| |
| .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 = svm_get_cs_db_l_bits, |
| .decache_cr0_cr4_guest_bits = svm_decache_cr0_cr4_guest_bits, |
| .set_cr0 = svm_set_cr0, |
| .set_cr0_no_modeswitch = 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, |
| |
| .invlpg = svm_invlpg, |
| .tlb_flush = svm_flush_tlb, |
| .inject_page_fault = svm_inject_page_fault, |
| |
| .inject_gp = svm_inject_gp, |
| |
| .run = svm_vcpu_run, |
| .skip_emulated_instruction = skip_emulated_instruction, |
| .vcpu_setup = svm_vcpu_setup, |
| }; |
| |
| static int __init svm_init(void) |
| { |
| return kvm_init_arch(&svm_arch_ops, THIS_MODULE); |
| } |
| |
| static void __exit svm_exit(void) |
| { |
| kvm_exit_arch(); |
| } |
| |
| module_init(svm_init) |
| module_exit(svm_exit) |