diff options
Diffstat (limited to 'drivers/kvm/svm.c')
| -rw-r--r-- | drivers/kvm/svm.c | 1721 |
1 files changed, 1721 insertions, 0 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c new file mode 100644 index 0000000..85f61dd --- /dev/null +++ b/drivers/kvm/svm.c @@ -0,0 +1,1721 @@ +/* + * 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; + 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) |