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-rw-r--r--arch/x86/kvm/vmx.c2679
1 files changed, 2679 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
new file mode 100644
index 000000000000..ad36447e696e
--- /dev/null
+++ b/arch/x86/kvm/vmx.c
@@ -0,0 +1,2679 @@
+/*
+ * Kernel-based Virtual Machine driver for Linux
+ *
+ * This module enables machines with Intel VT-x extensions to run virtual
+ * machines without emulation or binary translation.
+ *
+ * Copyright (C) 2006 Qumranet, Inc.
+ *
+ * Authors:
+ * Avi Kivity <avi@qumranet.com>
+ * Yaniv Kamay <yaniv@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 "irq.h"
+#include "vmx.h"
+#include "segment_descriptor.h"
+#include "mmu.h"
+
+#include <linux/kvm_host.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/sched.h>
+#include <linux/moduleparam.h>
+
+#include <asm/io.h>
+#include <asm/desc.h>
+
+MODULE_AUTHOR("Qumranet");
+MODULE_LICENSE("GPL");
+
+static int bypass_guest_pf = 1;
+module_param(bypass_guest_pf, bool, 0);
+
+struct vmcs {
+ u32 revision_id;
+ u32 abort;
+ char data[0];
+};
+
+struct vcpu_vmx {
+ struct kvm_vcpu vcpu;
+ int launched;
+ u8 fail;
+ u32 idt_vectoring_info;
+ struct kvm_msr_entry *guest_msrs;
+ struct kvm_msr_entry *host_msrs;
+ int nmsrs;
+ int save_nmsrs;
+ int msr_offset_efer;
+#ifdef CONFIG_X86_64
+ int msr_offset_kernel_gs_base;
+#endif
+ struct vmcs *vmcs;
+ struct {
+ int loaded;
+ u16 fs_sel, gs_sel, ldt_sel;
+ int gs_ldt_reload_needed;
+ int fs_reload_needed;
+ int guest_efer_loaded;
+ } host_state;
+ struct {
+ struct {
+ bool pending;
+ u8 vector;
+ unsigned rip;
+ } irq;
+ } rmode;
+};
+
+static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
+{
+ return container_of(vcpu, struct vcpu_vmx, vcpu);
+}
+
+static int init_rmode_tss(struct kvm *kvm);
+
+static DEFINE_PER_CPU(struct vmcs *, vmxarea);
+static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
+
+static struct page *vmx_io_bitmap_a;
+static struct page *vmx_io_bitmap_b;
+
+static struct vmcs_config {
+ int size;
+ int order;
+ u32 revision_id;
+ u32 pin_based_exec_ctrl;
+ u32 cpu_based_exec_ctrl;
+ u32 cpu_based_2nd_exec_ctrl;
+ u32 vmexit_ctrl;
+ u32 vmentry_ctrl;
+} vmcs_config;
+
+#define VMX_SEGMENT_FIELD(seg) \
+ [VCPU_SREG_##seg] = { \
+ .selector = GUEST_##seg##_SELECTOR, \
+ .base = GUEST_##seg##_BASE, \
+ .limit = GUEST_##seg##_LIMIT, \
+ .ar_bytes = GUEST_##seg##_AR_BYTES, \
+ }
+
+static struct kvm_vmx_segment_field {
+ unsigned selector;
+ unsigned base;
+ unsigned limit;
+ unsigned ar_bytes;
+} kvm_vmx_segment_fields[] = {
+ VMX_SEGMENT_FIELD(CS),
+ VMX_SEGMENT_FIELD(DS),
+ VMX_SEGMENT_FIELD(ES),
+ VMX_SEGMENT_FIELD(FS),
+ VMX_SEGMENT_FIELD(GS),
+ VMX_SEGMENT_FIELD(SS),
+ VMX_SEGMENT_FIELD(TR),
+ VMX_SEGMENT_FIELD(LDTR),
+};
+
+/*
+ * Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it
+ * away by decrementing the array size.
+ */
+static const u32 vmx_msr_index[] = {
+#ifdef CONFIG_X86_64
+ MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
+#endif
+ MSR_EFER, MSR_K6_STAR,
+};
+#define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
+
+static void load_msrs(struct kvm_msr_entry *e, int n)
+{
+ int i;
+
+ for (i = 0; i < n; ++i)
+ wrmsrl(e[i].index, e[i].data);
+}
+
+static void save_msrs(struct kvm_msr_entry *e, int n)
+{
+ int i;
+
+ for (i = 0; i < n; ++i)
+ rdmsrl(e[i].index, e[i].data);
+}
+
+static inline int is_page_fault(u32 intr_info)
+{
+ return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
+ INTR_INFO_VALID_MASK)) ==
+ (INTR_TYPE_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
+}
+
+static inline int is_no_device(u32 intr_info)
+{
+ return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
+ INTR_INFO_VALID_MASK)) ==
+ (INTR_TYPE_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
+}
+
+static inline int is_invalid_opcode(u32 intr_info)
+{
+ return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
+ INTR_INFO_VALID_MASK)) ==
+ (INTR_TYPE_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
+}
+
+static inline int is_external_interrupt(u32 intr_info)
+{
+ return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
+ == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
+}
+
+static inline int cpu_has_vmx_tpr_shadow(void)
+{
+ return (vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW);
+}
+
+static inline int vm_need_tpr_shadow(struct kvm *kvm)
+{
+ return ((cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm)));
+}
+
+static inline int cpu_has_secondary_exec_ctrls(void)
+{
+ return (vmcs_config.cpu_based_exec_ctrl &
+ CPU_BASED_ACTIVATE_SECONDARY_CONTROLS);
+}
+
+static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
+{
+ return (vmcs_config.cpu_based_2nd_exec_ctrl &
+ SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
+}
+
+static inline int vm_need_virtualize_apic_accesses(struct kvm *kvm)
+{
+ return ((cpu_has_vmx_virtualize_apic_accesses()) &&
+ (irqchip_in_kernel(kvm)));
+}
+
+static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
+{
+ int i;
+
+ for (i = 0; i < vmx->nmsrs; ++i)
+ if (vmx->guest_msrs[i].index == msr)
+ return i;
+ return -1;
+}
+
+static struct kvm_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
+{
+ int i;
+
+ i = __find_msr_index(vmx, msr);
+ if (i >= 0)
+ return &vmx->guest_msrs[i];
+ return NULL;
+}
+
+static void vmcs_clear(struct vmcs *vmcs)
+{
+ u64 phys_addr = __pa(vmcs);
+ u8 error;
+
+ asm volatile (ASM_VMX_VMCLEAR_RAX "; setna %0"
+ : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
+ : "cc", "memory");
+ if (error)
+ printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
+ vmcs, phys_addr);
+}
+
+static void __vcpu_clear(void *arg)
+{
+ struct vcpu_vmx *vmx = arg;
+ int cpu = raw_smp_processor_id();
+
+ if (vmx->vcpu.cpu == cpu)
+ vmcs_clear(vmx->vmcs);
+ if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
+ per_cpu(current_vmcs, cpu) = NULL;
+ rdtscll(vmx->vcpu.arch.host_tsc);
+}
+
+static void vcpu_clear(struct vcpu_vmx *vmx)
+{
+ if (vmx->vcpu.cpu == -1)
+ return;
+ smp_call_function_single(vmx->vcpu.cpu, __vcpu_clear, vmx, 0, 1);
+ vmx->launched = 0;
+}
+
+static unsigned long vmcs_readl(unsigned long field)
+{
+ unsigned long value;
+
+ asm volatile (ASM_VMX_VMREAD_RDX_RAX
+ : "=a"(value) : "d"(field) : "cc");
+ return value;
+}
+
+static u16 vmcs_read16(unsigned long field)
+{
+ return vmcs_readl(field);
+}
+
+static u32 vmcs_read32(unsigned long field)
+{
+ return vmcs_readl(field);
+}
+
+static u64 vmcs_read64(unsigned long field)
+{
+#ifdef CONFIG_X86_64
+ return vmcs_readl(field);
+#else
+ return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
+#endif
+}
+
+static noinline void vmwrite_error(unsigned long field, unsigned long value)
+{
+ printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
+ field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
+ dump_stack();
+}
+
+static void vmcs_writel(unsigned long field, unsigned long value)
+{
+ u8 error;
+
+ asm volatile (ASM_VMX_VMWRITE_RAX_RDX "; setna %0"
+ : "=q"(error) : "a"(value), "d"(field) : "cc");
+ if (unlikely(error))
+ vmwrite_error(field, value);
+}
+
+static void vmcs_write16(unsigned long field, u16 value)
+{
+ vmcs_writel(field, value);
+}
+
+static void vmcs_write32(unsigned long field, u32 value)
+{
+ vmcs_writel(field, value);
+}
+
+static void vmcs_write64(unsigned long field, u64 value)
+{
+#ifdef CONFIG_X86_64
+ vmcs_writel(field, value);
+#else
+ vmcs_writel(field, value);
+ asm volatile ("");
+ vmcs_writel(field+1, value >> 32);
+#endif
+}
+
+static void vmcs_clear_bits(unsigned long field, u32 mask)
+{
+ vmcs_writel(field, vmcs_readl(field) & ~mask);
+}
+
+static void vmcs_set_bits(unsigned long field, u32 mask)
+{
+ vmcs_writel(field, vmcs_readl(field) | mask);
+}
+
+static void update_exception_bitmap(struct kvm_vcpu *vcpu)
+{
+ u32 eb;
+
+ eb = (1u << PF_VECTOR) | (1u << UD_VECTOR);
+ if (!vcpu->fpu_active)
+ eb |= 1u << NM_VECTOR;
+ if (vcpu->guest_debug.enabled)
+ eb |= 1u << 1;
+ if (vcpu->arch.rmode.active)
+ eb = ~0;
+ vmcs_write32(EXCEPTION_BITMAP, eb);
+}
+
+static void reload_tss(void)
+{
+#ifndef CONFIG_X86_64
+
+ /*
+ * VT restores TR but not its size. Useless.
+ */
+ struct descriptor_table gdt;
+ struct segment_descriptor *descs;
+
+ get_gdt(&gdt);
+ descs = (void *)gdt.base;
+ descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
+ load_TR_desc();
+#endif
+}
+
+static void load_transition_efer(struct vcpu_vmx *vmx)
+{
+ int efer_offset = vmx->msr_offset_efer;
+ u64 host_efer = vmx->host_msrs[efer_offset].data;
+ u64 guest_efer = vmx->guest_msrs[efer_offset].data;
+ u64 ignore_bits;
+
+ if (efer_offset < 0)
+ return;
+ /*
+ * NX is emulated; LMA and LME handled by hardware; SCE meaninless
+ * outside long mode
+ */
+ ignore_bits = EFER_NX | EFER_SCE;
+#ifdef CONFIG_X86_64
+ ignore_bits |= EFER_LMA | EFER_LME;
+ /* SCE is meaningful only in long mode on Intel */
+ if (guest_efer & EFER_LMA)
+ ignore_bits &= ~(u64)EFER_SCE;
+#endif
+ if ((guest_efer & ~ignore_bits) == (host_efer & ~ignore_bits))
+ return;
+
+ vmx->host_state.guest_efer_loaded = 1;
+ guest_efer &= ~ignore_bits;
+ guest_efer |= host_efer & ignore_bits;
+ wrmsrl(MSR_EFER, guest_efer);
+ vmx->vcpu.stat.efer_reload++;
+}
+
+static void reload_host_efer(struct vcpu_vmx *vmx)
+{
+ if (vmx->host_state.guest_efer_loaded) {
+ vmx->host_state.guest_efer_loaded = 0;
+ load_msrs(vmx->host_msrs + vmx->msr_offset_efer, 1);
+ }
+}
+
+static void vmx_save_host_state(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+ if (vmx->host_state.loaded)
+ return;
+
+ vmx->host_state.loaded = 1;
+ /*
+ * Set host fs and gs selectors. Unfortunately, 22.2.3 does not
+ * allow segment selectors with cpl > 0 or ti == 1.
+ */
+ vmx->host_state.ldt_sel = read_ldt();
+ vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
+ vmx->host_state.fs_sel = read_fs();
+ if (!(vmx->host_state.fs_sel & 7)) {
+ vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
+ vmx->host_state.fs_reload_needed = 0;
+ } else {
+ vmcs_write16(HOST_FS_SELECTOR, 0);
+ vmx->host_state.fs_reload_needed = 1;
+ }
+ vmx->host_state.gs_sel = read_gs();
+ if (!(vmx->host_state.gs_sel & 7))
+ vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
+ else {
+ vmcs_write16(HOST_GS_SELECTOR, 0);
+ vmx->host_state.gs_ldt_reload_needed = 1;
+ }
+
+#ifdef CONFIG_X86_64
+ vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
+ vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
+#else
+ vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
+ vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
+#endif
+
+#ifdef CONFIG_X86_64
+ if (is_long_mode(&vmx->vcpu))
+ save_msrs(vmx->host_msrs +
+ vmx->msr_offset_kernel_gs_base, 1);
+
+#endif
+ load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
+ load_transition_efer(vmx);
+}
+
+static void vmx_load_host_state(struct vcpu_vmx *vmx)
+{
+ unsigned long flags;
+
+ if (!vmx->host_state.loaded)
+ return;
+
+ ++vmx->vcpu.stat.host_state_reload;
+ vmx->host_state.loaded = 0;
+ if (vmx->host_state.fs_reload_needed)
+ load_fs(vmx->host_state.fs_sel);
+ if (vmx->host_state.gs_ldt_reload_needed) {
+ load_ldt(vmx->host_state.ldt_sel);
+ /*
+ * If we have to reload gs, we must take care to
+ * preserve our gs base.
+ */
+ local_irq_save(flags);
+ load_gs(vmx->host_state.gs_sel);
+#ifdef CONFIG_X86_64
+ wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
+#endif
+ local_irq_restore(flags);
+ }
+ reload_tss();
+ save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
+ load_msrs(vmx->host_msrs, vmx->save_nmsrs);
+ reload_host_efer(vmx);
+}
+
+/*
+ * Switches to specified vcpu, until a matching vcpu_put(), but assumes
+ * vcpu mutex is already taken.
+ */
+static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u64 phys_addr = __pa(vmx->vmcs);
+ u64 tsc_this, delta;
+
+ if (vcpu->cpu != cpu) {
+ vcpu_clear(vmx);
+ kvm_migrate_apic_timer(vcpu);
+ }
+
+ if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
+ u8 error;
+
+ per_cpu(current_vmcs, cpu) = vmx->vmcs;
+ asm volatile (ASM_VMX_VMPTRLD_RAX "; setna %0"
+ : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
+ : "cc");
+ if (error)
+ printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
+ vmx->vmcs, phys_addr);
+ }
+
+ if (vcpu->cpu != cpu) {
+ struct descriptor_table dt;
+ unsigned long sysenter_esp;
+
+ vcpu->cpu = cpu;
+ /*
+ * Linux uses per-cpu TSS and GDT, so set these when switching
+ * processors.
+ */
+ vmcs_writel(HOST_TR_BASE, read_tr_base()); /* 22.2.4 */
+ get_gdt(&dt);
+ vmcs_writel(HOST_GDTR_BASE, dt.base); /* 22.2.4 */
+
+ rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
+ vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
+
+ /*
+ * Make sure the time stamp counter is monotonous.
+ */
+ rdtscll(tsc_this);
+ delta = vcpu->arch.host_tsc - tsc_this;
+ vmcs_write64(TSC_OFFSET, vmcs_read64(TSC_OFFSET) + delta);
+ }
+}
+
+static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
+{
+ vmx_load_host_state(to_vmx(vcpu));
+}
+
+static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
+{
+ if (vcpu->fpu_active)
+ return;
+ vcpu->fpu_active = 1;
+ vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
+ if (vcpu->arch.cr0 & X86_CR0_TS)
+ vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
+ update_exception_bitmap(vcpu);
+}
+
+static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
+{
+ if (!vcpu->fpu_active)
+ return;
+ vcpu->fpu_active = 0;
+ vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
+ update_exception_bitmap(vcpu);
+}
+
+static void vmx_vcpu_decache(struct kvm_vcpu *vcpu)
+{
+ vcpu_clear(to_vmx(vcpu));
+}
+
+static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
+{
+ return vmcs_readl(GUEST_RFLAGS);
+}
+
+static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
+{
+ if (vcpu->arch.rmode.active)
+ rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
+ vmcs_writel(GUEST_RFLAGS, rflags);
+}
+
+static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
+{
+ unsigned long rip;
+ u32 interruptibility;
+
+ rip = vmcs_readl(GUEST_RIP);
+ rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
+ vmcs_writel(GUEST_RIP, rip);
+
+ /*
+ * We emulated an instruction, so temporary interrupt blocking
+ * should be removed, if set.
+ */
+ interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
+ if (interruptibility & 3)
+ vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
+ interruptibility & ~3);
+ vcpu->arch.interrupt_window_open = 1;
+}
+
+static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
+ bool has_error_code, u32 error_code)
+{
+ vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
+ nr | INTR_TYPE_EXCEPTION
+ | (has_error_code ? INTR_INFO_DELIEVER_CODE_MASK : 0)
+ | INTR_INFO_VALID_MASK);
+ if (has_error_code)
+ vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
+}
+
+static bool vmx_exception_injected(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+ return !(vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
+}
+
+/*
+ * Swap MSR entry in host/guest MSR entry array.
+ */
+#ifdef CONFIG_X86_64
+static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
+{
+ struct kvm_msr_entry tmp;
+
+ tmp = vmx->guest_msrs[to];
+ vmx->guest_msrs[to] = vmx->guest_msrs[from];
+ vmx->guest_msrs[from] = tmp;
+ tmp = vmx->host_msrs[to];
+ vmx->host_msrs[to] = vmx->host_msrs[from];
+ vmx->host_msrs[from] = tmp;
+}
+#endif
+
+/*
+ * Set up the vmcs to automatically save and restore system
+ * msrs. Don't touch the 64-bit msrs if the guest is in legacy
+ * mode, as fiddling with msrs is very expensive.
+ */
+static void setup_msrs(struct vcpu_vmx *vmx)
+{
+ int save_nmsrs;
+
+ save_nmsrs = 0;
+#ifdef CONFIG_X86_64
+ if (is_long_mode(&vmx->vcpu)) {
+ int index;
+
+ index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
+ if (index >= 0)
+ move_msr_up(vmx, index, save_nmsrs++);
+ index = __find_msr_index(vmx, MSR_LSTAR);
+ if (index >= 0)
+ move_msr_up(vmx, index, save_nmsrs++);
+ index = __find_msr_index(vmx, MSR_CSTAR);
+ if (index >= 0)
+ move_msr_up(vmx, index, save_nmsrs++);
+ index = __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
+ if (index >= 0)
+ move_msr_up(vmx, index, save_nmsrs++);
+ /*
+ * MSR_K6_STAR is only needed on long mode guests, and only
+ * if efer.sce is enabled.
+ */
+ index = __find_msr_index(vmx, MSR_K6_STAR);
+ if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE))
+ move_msr_up(vmx, index, save_nmsrs++);
+ }
+#endif
+ vmx->save_nmsrs = save_nmsrs;
+
+#ifdef CONFIG_X86_64
+ vmx->msr_offset_kernel_gs_base =
+ __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
+#endif
+ vmx->msr_offset_efer = __find_msr_index(vmx, MSR_EFER);
+}
+
+/*
+ * reads and returns guest's timestamp counter "register"
+ * guest_tsc = host_tsc + tsc_offset -- 21.3
+ */
+static u64 guest_read_tsc(void)
+{
+ u64 host_tsc, tsc_offset;
+
+ rdtscll(host_tsc);
+ tsc_offset = vmcs_read64(TSC_OFFSET);
+ return host_tsc + tsc_offset;
+}
+
+/*
+ * writes 'guest_tsc' into guest's timestamp counter "register"
+ * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
+ */
+static void guest_write_tsc(u64 guest_tsc)
+{
+ u64 host_tsc;
+
+ rdtscll(host_tsc);
+ vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
+}
+
+/*
+ * Reads an msr value (of 'msr_index') into 'pdata'.
+ * Returns 0 on success, non-0 otherwise.
+ * Assumes vcpu_load() was already called.
+ */
+static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
+{
+ u64 data;
+ struct kvm_msr_entry *msr;
+
+ if (!pdata) {
+ printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
+ return -EINVAL;
+ }
+
+ switch (msr_index) {
+#ifdef CONFIG_X86_64
+ case MSR_FS_BASE:
+ data = vmcs_readl(GUEST_FS_BASE);
+ break;
+ case MSR_GS_BASE:
+ data = vmcs_readl(GUEST_GS_BASE);
+ break;
+ case MSR_EFER:
+ return kvm_get_msr_common(vcpu, msr_index, pdata);
+#endif
+ case MSR_IA32_TIME_STAMP_COUNTER:
+ data = guest_read_tsc();
+ break;
+ case MSR_IA32_SYSENTER_CS:
+ data = vmcs_read32(GUEST_SYSENTER_CS);
+ break;
+ case MSR_IA32_SYSENTER_EIP:
+ data = vmcs_readl(GUEST_SYSENTER_EIP);
+ break;
+ case MSR_IA32_SYSENTER_ESP:
+ data = vmcs_readl(GUEST_SYSENTER_ESP);
+ break;
+ default:
+ msr = find_msr_entry(to_vmx(vcpu), msr_index);
+ if (msr) {
+ data = msr->data;
+ break;
+ }
+ return kvm_get_msr_common(vcpu, msr_index, pdata);
+ }
+
+ *pdata = data;
+ return 0;
+}
+
+/*
+ * Writes msr value into into the appropriate "register".
+ * Returns 0 on success, non-0 otherwise.
+ * Assumes vcpu_load() was already called.
+ */
+static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ struct kvm_msr_entry *msr;
+ int ret = 0;
+
+ switch (msr_index) {
+#ifdef CONFIG_X86_64
+ case MSR_EFER:
+ ret = kvm_set_msr_common(vcpu, msr_index, data);
+ if (vmx->host_state.loaded) {
+ reload_host_efer(vmx);
+ load_transition_efer(vmx);
+ }
+ break;
+ case MSR_FS_BASE:
+ vmcs_writel(GUEST_FS_BASE, data);
+ break;
+ case MSR_GS_BASE:
+ vmcs_writel(GUEST_GS_BASE, data);
+ break;
+#endif
+ case MSR_IA32_SYSENTER_CS:
+ vmcs_write32(GUEST_SYSENTER_CS, data);
+ break;
+ case MSR_IA32_SYSENTER_EIP:
+ vmcs_writel(GUEST_SYSENTER_EIP, data);
+ break;
+ case MSR_IA32_SYSENTER_ESP:
+ vmcs_writel(GUEST_SYSENTER_ESP, data);
+ break;
+ case MSR_IA32_TIME_STAMP_COUNTER:
+ guest_write_tsc(data);
+ break;
+ default:
+ msr = find_msr_entry(vmx, msr_index);
+ if (msr) {
+ msr->data = data;
+ if (vmx->host_state.loaded)
+ load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
+ break;
+ }
+ ret = kvm_set_msr_common(vcpu, msr_index, data);
+ }
+
+ return ret;
+}
+
+/*
+ * Sync the rsp and rip registers into the vcpu structure. This allows
+ * registers to be accessed by indexing vcpu->arch.regs.
+ */
+static void vcpu_load_rsp_rip(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
+ vcpu->arch.rip = vmcs_readl(GUEST_RIP);
+}
+
+/*
+ * Syncs rsp and rip back into the vmcs. Should be called after possible
+ * modification.
+ */
+static void vcpu_put_rsp_rip(struct kvm_vcpu *vcpu)
+{
+ vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
+ vmcs_writel(GUEST_RIP, vcpu->arch.rip);
+}
+
+static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg)
+{
+ unsigned long dr7 = 0x400;
+ int old_singlestep;
+
+ old_singlestep = vcpu->guest_debug.singlestep;
+
+ vcpu->guest_debug.enabled = dbg->enabled;
+ if (vcpu->guest_debug.enabled) {
+ int i;
+
+ dr7 |= 0x200; /* exact */
+ for (i = 0; i < 4; ++i) {
+ if (!dbg->breakpoints[i].enabled)
+ continue;
+ vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
+ dr7 |= 2 << (i*2); /* global enable */
+ dr7 |= 0 << (i*4+16); /* execution breakpoint */
+ }
+
+ vcpu->guest_debug.singlestep = dbg->singlestep;
+ } else
+ vcpu->guest_debug.singlestep = 0;
+
+ if (old_singlestep && !vcpu->guest_debug.singlestep) {
+ unsigned long flags;
+
+ flags = vmcs_readl(GUEST_RFLAGS);
+ flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
+ vmcs_writel(GUEST_RFLAGS, flags);
+ }
+
+ update_exception_bitmap(vcpu);
+ vmcs_writel(GUEST_DR7, dr7);
+
+ return 0;
+}
+
+static int vmx_get_irq(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 idtv_info_field;
+
+ idtv_info_field = vmx->idt_vectoring_info;
+ if (idtv_info_field & INTR_INFO_VALID_MASK) {
+ if (is_external_interrupt(idtv_info_field))
+ return idtv_info_field & VECTORING_INFO_VECTOR_MASK;
+ else
+ printk(KERN_DEBUG "pending exception: not handled yet\n");
+ }
+ return -1;
+}
+
+static __init int cpu_has_kvm_support(void)
+{
+ unsigned long ecx = cpuid_ecx(1);
+ return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */
+}
+
+static __init int vmx_disabled_by_bios(void)
+{
+ u64 msr;
+
+ rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
+ return (msr & (MSR_IA32_FEATURE_CONTROL_LOCKED |
+ MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
+ == MSR_IA32_FEATURE_CONTROL_LOCKED;
+ /* locked but not enabled */
+}
+
+static void hardware_enable(void *garbage)
+{
+ int cpu = raw_smp_processor_id();
+ u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
+ u64 old;
+
+ rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
+ if ((old & (MSR_IA32_FEATURE_CONTROL_LOCKED |
+ MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
+ != (MSR_IA32_FEATURE_CONTROL_LOCKED |
+ MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
+ /* enable and lock */
+ wrmsrl(MSR_IA32_FEATURE_CONTROL, old |
+ MSR_IA32_FEATURE_CONTROL_LOCKED |
+ MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED);
+ write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
+ asm volatile (ASM_VMX_VMXON_RAX : : "a"(&phys_addr), "m"(phys_addr)
+ : "memory", "cc");
+}
+
+static void hardware_disable(void *garbage)
+{
+ asm volatile (ASM_VMX_VMXOFF : : : "cc");
+}
+
+static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
+ u32 msr, u32 *result)
+{
+ u32 vmx_msr_low, vmx_msr_high;
+ u32 ctl = ctl_min | ctl_opt;
+
+ rdmsr(msr, vmx_msr_low, vmx_msr_high);
+
+ ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
+ ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */
+
+ /* Ensure minimum (required) set of control bits are supported. */
+ if (ctl_min & ~ctl)
+ return -EIO;
+
+ *result = ctl;
+ return 0;
+}
+
+static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
+{
+ u32 vmx_msr_low, vmx_msr_high;
+ u32 min, opt;
+ u32 _pin_based_exec_control = 0;
+ u32 _cpu_based_exec_control = 0;
+ u32 _cpu_based_2nd_exec_control = 0;
+ u32 _vmexit_control = 0;
+ u32 _vmentry_control = 0;
+
+ min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
+ opt = 0;
+ if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
+ &_pin_based_exec_control) < 0)
+ return -EIO;
+
+ min = CPU_BASED_HLT_EXITING |
+#ifdef CONFIG_X86_64
+ CPU_BASED_CR8_LOAD_EXITING |
+ CPU_BASED_CR8_STORE_EXITING |
+#endif
+ CPU_BASED_USE_IO_BITMAPS |
+ CPU_BASED_MOV_DR_EXITING |
+ CPU_BASED_USE_TSC_OFFSETING;
+ opt = CPU_BASED_TPR_SHADOW |
+ CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
+ if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
+ &_cpu_based_exec_control) < 0)
+ return -EIO;
+#ifdef CONFIG_X86_64
+ if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
+ _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
+ ~CPU_BASED_CR8_STORE_EXITING;
+#endif
+ if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
+ min = 0;
+ opt = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
+ SECONDARY_EXEC_WBINVD_EXITING;
+ if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS2,
+ &_cpu_based_2nd_exec_control) < 0)
+ return -EIO;
+ }
+#ifndef CONFIG_X86_64
+ if (!(_cpu_based_2nd_exec_control &
+ SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
+ _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
+#endif
+
+ min = 0;
+#ifdef CONFIG_X86_64
+ min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
+#endif
+ opt = 0;
+ if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
+ &_vmexit_control) < 0)
+ return -EIO;
+
+ min = opt = 0;
+ if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
+ &_vmentry_control) < 0)
+ return -EIO;
+
+ rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
+
+ /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
+ if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
+ return -EIO;
+
+#ifdef CONFIG_X86_64
+ /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
+ if (vmx_msr_high & (1u<<16))
+ return -EIO;
+#endif
+
+ /* Require Write-Back (WB) memory type for VMCS accesses. */
+ if (((vmx_msr_high >> 18) & 15) != 6)
+ return -EIO;
+
+ vmcs_conf->size = vmx_msr_high & 0x1fff;
+ vmcs_conf->order = get_order(vmcs_config.size);
+ vmcs_conf->revision_id = vmx_msr_low;
+
+ vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
+ vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
+ vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
+ vmcs_conf->vmexit_ctrl = _vmexit_control;
+ vmcs_conf->vmentry_ctrl = _vmentry_control;
+
+ return 0;
+}
+
+static struct vmcs *alloc_vmcs_cpu(int cpu)
+{
+ int node = cpu_to_node(cpu);
+ struct page *pages;
+ struct vmcs *vmcs;
+
+ pages = alloc_pages_node(node, GFP_KERNEL, vmcs_config.order);
+ if (!pages)
+ return NULL;
+ vmcs = page_address(pages);
+ memset(vmcs, 0, vmcs_config.size);
+ vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
+ return vmcs;
+}
+
+static struct vmcs *alloc_vmcs(void)
+{
+ return alloc_vmcs_cpu(raw_smp_processor_id());
+}
+
+static void free_vmcs(struct vmcs *vmcs)
+{
+ free_pages((unsigned long)vmcs, vmcs_config.order);
+}
+
+static void free_kvm_area(void)
+{
+ int cpu;
+
+ for_each_online_cpu(cpu)
+ free_vmcs(per_cpu(vmxarea, cpu));
+}
+
+static __init int alloc_kvm_area(void)
+{
+ int cpu;
+
+ for_each_online_cpu(cpu) {
+ struct vmcs *vmcs;
+
+ vmcs = alloc_vmcs_cpu(cpu);
+ if (!vmcs) {
+ free_kvm_area();
+ return -ENOMEM;
+ }
+
+ per_cpu(vmxarea, cpu) = vmcs;
+ }
+ return 0;
+}
+
+static __init int hardware_setup(void)
+{
+ if (setup_vmcs_config(&vmcs_config) < 0)
+ return -EIO;
+ return alloc_kvm_area();
+}
+
+static __exit void hardware_unsetup(void)
+{
+ free_kvm_area();
+}
+
+static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
+{
+ struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
+
+ if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
+ vmcs_write16(sf->selector, save->selector);
+ vmcs_writel(sf->base, save->base);
+ vmcs_write32(sf->limit, save->limit);
+ vmcs_write32(sf->ar_bytes, save->ar);
+ } else {
+ u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
+ << AR_DPL_SHIFT;
+ vmcs_write32(sf->ar_bytes, 0x93 | dpl);
+ }
+}
+
+static void enter_pmode(struct kvm_vcpu *vcpu)
+{
+ unsigned long flags;
+
+ vcpu->arch.rmode.active = 0;
+
+ vmcs_writel(GUEST_TR_BASE, vcpu->arch.rmode.tr.base);
+ vmcs_write32(GUEST_TR_LIMIT, vcpu->arch.rmode.tr.limit);
+ vmcs_write32(GUEST_TR_AR_BYTES, vcpu->arch.rmode.tr.ar);
+
+ flags = vmcs_readl(GUEST_RFLAGS);
+ flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
+ flags |= (vcpu->arch.rmode.save_iopl << IOPL_SHIFT);
+ vmcs_writel(GUEST_RFLAGS, flags);
+
+ vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
+ (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
+
+ update_exception_bitmap(vcpu);
+
+ fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
+ fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
+ fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
+ fix_pmode_dataseg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
+
+ vmcs_write16(GUEST_SS_SELECTOR, 0);
+ vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
+
+ vmcs_write16(GUEST_CS_SELECTOR,
+ vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
+ vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
+}
+
+static gva_t rmode_tss_base(struct kvm *kvm)
+{
+ if (!kvm->arch.tss_addr) {
+ gfn_t base_gfn = kvm->memslots[0].base_gfn +
+ kvm->memslots[0].npages - 3;
+ return base_gfn << PAGE_SHIFT;
+ }
+ return kvm->arch.tss_addr;
+}
+
+static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
+{
+ struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
+
+ save->selector = vmcs_read16(sf->selector);
+ save->base = vmcs_readl(sf->base);
+ save->limit = vmcs_read32(sf->limit);
+ save->ar = vmcs_read32(sf->ar_bytes);
+ vmcs_write16(sf->selector, save->base >> 4);
+ vmcs_write32(sf->base, save->base & 0xfffff);
+ vmcs_write32(sf->limit, 0xffff);
+ vmcs_write32(sf->ar_bytes, 0xf3);
+}
+
+static void enter_rmode(struct kvm_vcpu *vcpu)
+{
+ unsigned long flags;
+
+ vcpu->arch.rmode.active = 1;
+
+ vcpu->arch.rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
+ vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
+
+ vcpu->arch.rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
+ vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
+
+ vcpu->arch.rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
+ vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
+
+ flags = vmcs_readl(GUEST_RFLAGS);
+ vcpu->arch.rmode.save_iopl
+ = (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
+
+ flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
+
+ vmcs_writel(GUEST_RFLAGS, flags);
+ vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
+ update_exception_bitmap(vcpu);
+
+ vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
+ vmcs_write32(GUEST_SS_LIMIT, 0xffff);
+ vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
+
+ vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
+ vmcs_write32(GUEST_CS_LIMIT, 0xffff);
+ if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
+ vmcs_writel(GUEST_CS_BASE, 0xf0000);
+ vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
+
+ fix_rmode_seg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
+ fix_rmode_seg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
+ fix_rmode_seg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
+ fix_rmode_seg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
+
+ kvm_mmu_reset_context(vcpu);
+ init_rmode_tss(vcpu->kvm);
+}
+
+#ifdef CONFIG_X86_64
+
+static void enter_lmode(struct kvm_vcpu *vcpu)
+{
+ u32 guest_tr_ar;
+
+ guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
+ if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
+ printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
+ __FUNCTION__);
+ vmcs_write32(GUEST_TR_AR_BYTES,
+ (guest_tr_ar & ~AR_TYPE_MASK)
+ | AR_TYPE_BUSY_64_TSS);
+ }
+
+ vcpu->arch.shadow_efer |= EFER_LMA;
+
+ find_msr_entry(to_vmx(vcpu), MSR_EFER)->data |= EFER_LMA | EFER_LME;
+ vmcs_write32(VM_ENTRY_CONTROLS,
+ vmcs_read32(VM_ENTRY_CONTROLS)
+ | VM_ENTRY_IA32E_MODE);
+}
+
+static void exit_lmode(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.shadow_efer &= ~EFER_LMA;
+
+ vmcs_write32(VM_ENTRY_CONTROLS,
+ vmcs_read32(VM_ENTRY_CONTROLS)
+ & ~VM_ENTRY_IA32E_MODE);
+}
+
+#endif
+
+static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.cr4 &= KVM_GUEST_CR4_MASK;
+ vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
+}
+
+static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
+{
+ vmx_fpu_deactivate(vcpu);
+
+ if (vcpu->arch.rmode.active && (cr0 & X86_CR0_PE))
+ enter_pmode(vcpu);
+
+ if (!vcpu->arch.rmode.active && !(cr0 & X86_CR0_PE))
+ enter_rmode(vcpu);
+
+#ifdef CONFIG_X86_64
+ if (vcpu->arch.shadow_efer & EFER_LME) {
+ if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
+ enter_lmode(vcpu);
+ if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
+ exit_lmode(vcpu);
+ }
+#endif
+
+ vmcs_writel(CR0_READ_SHADOW, cr0);
+ vmcs_writel(GUEST_CR0,
+ (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON);
+ vcpu->arch.cr0 = cr0;
+
+ if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
+ vmx_fpu_activate(vcpu);
+}
+
+static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
+{
+ vmcs_writel(GUEST_CR3, cr3);
+ if (vcpu->arch.cr0 & X86_CR0_PE)
+ vmx_fpu_deactivate(vcpu);
+}
+
+static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
+{
+ vmcs_writel(CR4_READ_SHADOW, cr4);
+ vmcs_writel(GUEST_CR4, cr4 | (vcpu->arch.rmode.active ?
+ KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON));
+ vcpu->arch.cr4 = cr4;
+}
+
+#ifdef CONFIG_X86_64
+
+static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ struct kvm_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
+
+ vcpu->arch.shadow_efer = efer;
+ if (efer & EFER_LMA) {
+ vmcs_write32(VM_ENTRY_CONTROLS,
+ vmcs_read32(VM_ENTRY_CONTROLS) |
+ VM_ENTRY_IA32E_MODE);
+ msr->data = efer;
+
+ } else {
+ vmcs_write32(VM_ENTRY_CONTROLS,
+ vmcs_read32(VM_ENTRY_CONTROLS) &
+ ~VM_ENTRY_IA32E_MODE);
+
+ msr->data = efer & ~EFER_LME;
+ }
+ setup_msrs(vmx);
+}
+
+#endif
+
+static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
+{
+ struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
+
+ return vmcs_readl(sf->base);
+}
+
+static void vmx_get_segment(struct kvm_vcpu *vcpu,
+ struct kvm_segment *var, int seg)
+{
+ struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
+ u32 ar;
+
+ var->base = vmcs_readl(sf->base);
+ var->limit = vmcs_read32(sf->limit);
+ var->selector = vmcs_read16(sf->selector);
+ ar = vmcs_read32(sf->ar_bytes);
+ if (ar & AR_UNUSABLE_MASK)
+ ar = 0;
+ var->type = ar & 15;
+ var->s = (ar >> 4) & 1;
+ var->dpl = (ar >> 5) & 3;
+ var->present = (ar >> 7) & 1;
+ var->avl = (ar >> 12) & 1;
+ var->l = (ar >> 13) & 1;
+ var->db = (ar >> 14) & 1;
+ var->g = (ar >> 15) & 1;
+ var->unusable = (ar >> 16) & 1;
+}
+
+static u32 vmx_segment_access_rights(struct kvm_segment *var)
+{
+ u32 ar;
+
+ if (var->unusable)
+ ar = 1 << 16;
+ else {
+ ar = var->type & 15;
+ ar |= (var->s & 1) << 4;
+ ar |= (var->dpl & 3) << 5;
+ ar |= (var->present & 1) << 7;
+ ar |= (var->avl & 1) << 12;
+ ar |= (var->l & 1) << 13;
+ ar |= (var->db & 1) << 14;
+ ar |= (var->g & 1) << 15;
+ }
+ if (ar == 0) /* a 0 value means unusable */
+ ar = AR_UNUSABLE_MASK;
+
+ return ar;
+}
+
+static void vmx_set_segment(struct kvm_vcpu *vcpu,
+ struct kvm_segment *var, int seg)
+{
+ struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
+ u32 ar;
+
+ if (vcpu->arch.rmode.active && seg == VCPU_SREG_TR) {
+ vcpu->arch.rmode.tr.selector = var->selector;
+ vcpu->arch.rmode.tr.base = var->base;
+ vcpu->arch.rmode.tr.limit = var->limit;
+ vcpu->arch.rmode.tr.ar = vmx_segment_access_rights(var);
+ return;
+ }
+ vmcs_writel(sf->base, var->base);
+ vmcs_write32(sf->limit, var->limit);
+ vmcs_write16(sf->selector, var->selector);
+ if (vcpu->arch.rmode.active && var->s) {
+ /*
+ * Hack real-mode segments into vm86 compatibility.
+ */
+ if (var->base == 0xffff0000 && var->selector == 0xf000)
+ vmcs_writel(sf->base, 0xf0000);
+ ar = 0xf3;
+ } else
+ ar = vmx_segment_access_rights(var);
+ vmcs_write32(sf->ar_bytes, ar);
+}
+
+static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
+{
+ u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
+
+ *db = (ar >> 14) & 1;
+ *l = (ar >> 13) & 1;
+}
+
+static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+{
+ dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
+ dt->base = vmcs_readl(GUEST_IDTR_BASE);
+}
+
+static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+{
+ vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
+ vmcs_writel(GUEST_IDTR_BASE, dt->base);
+}
+
+static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+{
+ dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
+ dt->base = vmcs_readl(GUEST_GDTR_BASE);
+}
+
+static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+{
+ vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
+ vmcs_writel(GUEST_GDTR_BASE, dt->base);
+}
+
+static int init_rmode_tss(struct kvm *kvm)
+{
+ gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
+ u16 data = 0;
+ int ret = 0;
+ int r;
+
+ down_read(&current->mm->mmap_sem);
+ r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
+ if (r < 0)
+ goto out;
+ data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
+ r = kvm_write_guest_page(kvm, fn++, &data, 0x66, sizeof(u16));
+ if (r < 0)
+ goto out;
+ r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
+ if (r < 0)
+ goto out;
+ r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
+ if (r < 0)
+ goto out;
+ data = ~0;
+ r = kvm_write_guest_page(kvm, fn, &data,
+ RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
+ sizeof(u8));
+ if (r < 0)
+ goto out;
+
+ ret = 1;
+out:
+ up_read(&current->mm->mmap_sem);
+ return ret;
+}
+
+static void seg_setup(int seg)
+{
+ struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
+
+ vmcs_write16(sf->selector, 0);
+ vmcs_writel(sf->base, 0);
+ vmcs_write32(sf->limit, 0xffff);
+ vmcs_write32(sf->ar_bytes, 0x93);
+}
+
+static int alloc_apic_access_page(struct kvm *kvm)
+{
+ struct kvm_userspace_memory_region kvm_userspace_mem;
+ int r = 0;
+
+ down_write(&current->mm->mmap_sem);
+ if (kvm->arch.apic_access_page)
+ goto out;
+ kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
+ kvm_userspace_mem.flags = 0;
+ kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
+ kvm_userspace_mem.memory_size = PAGE_SIZE;
+ r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
+ if (r)
+ goto out;
+ kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
+out:
+ up_write(&current->mm->mmap_sem);
+ return r;
+}
+
+/*
+ * Sets up the vmcs for emulated real mode.
+ */
+static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
+{
+ u32 host_sysenter_cs;
+ u32 junk;
+ unsigned long a;
+ struct descriptor_table dt;
+ int i;
+ unsigned long kvm_vmx_return;
+ u32 exec_control;
+
+ /* I/O */
+ vmcs_write64(IO_BITMAP_A, page_to_phys(vmx_io_bitmap_a));
+ vmcs_write64(IO_BITMAP_B, page_to_phys(vmx_io_bitmap_b));
+
+ vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
+
+ /* Control */
+ vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
+ vmcs_config.pin_based_exec_ctrl);
+
+ exec_control = vmcs_config.cpu_based_exec_ctrl;
+ if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
+ exec_control &= ~CPU_BASED_TPR_SHADOW;
+#ifdef CONFIG_X86_64
+ exec_control |= CPU_BASED_CR8_STORE_EXITING |
+ CPU_BASED_CR8_LOAD_EXITING;
+#endif
+ }
+ vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
+
+ if (cpu_has_secondary_exec_ctrls()) {
+ exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
+ if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
+ exec_control &=
+ ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
+ vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
+ }
+
+ vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
+ vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
+ vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */
+
+ vmcs_writel(HOST_CR0, read_cr0()); /* 22.2.3 */
+ vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */
+ vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
+
+ vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */
+ vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
+ vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */
+ vmcs_write16(HOST_FS_SELECTOR, read_fs()); /* 22.2.4 */
+ vmcs_write16(HOST_GS_SELECTOR, read_gs()); /* 22.2.4 */
+ vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
+#ifdef CONFIG_X86_64
+ rdmsrl(MSR_FS_BASE, a);
+ vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
+ rdmsrl(MSR_GS_BASE, a);
+ vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
+#else
+ vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
+ vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
+#endif
+
+ vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */
+
+ get_idt(&dt);
+ vmcs_writel(HOST_IDTR_BASE, dt.base); /* 22.2.4 */
+
+ asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
+ vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
+ vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
+ vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
+ vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
+
+ rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
+ vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
+ rdmsrl(MSR_IA32_SYSENTER_ESP, a);
+ vmcs_writel(HOST_IA32_SYSENTER_ESP, a); /* 22.2.3 */
+ rdmsrl(MSR_IA32_SYSENTER_EIP, a);
+ vmcs_writel(HOST_IA32_SYSENTER_EIP, a); /* 22.2.3 */
+
+ for (i = 0; i < NR_VMX_MSR; ++i) {
+ u32 index = vmx_msr_index[i];
+ u32 data_low, data_high;
+ u64 data;
+ int j = vmx->nmsrs;
+
+ if (rdmsr_safe(index, &data_low, &data_high) < 0)
+ continue;
+ if (wrmsr_safe(index, data_low, data_high) < 0)
+ continue;
+ data = data_low | ((u64)data_high << 32);
+ vmx->host_msrs[j].index = index;
+ vmx->host_msrs[j].reserved = 0;
+ vmx->host_msrs[j].data = data;
+ vmx->guest_msrs[j] = vmx->host_msrs[j];
+ ++vmx->nmsrs;
+ }
+
+ vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
+
+ /* 22.2.1, 20.8.1 */
+ vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
+
+ vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
+ vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
+
+ if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
+ if (alloc_apic_access_page(vmx->vcpu.kvm) != 0)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u64 msr;
+ int ret;
+
+ if (!init_rmode_tss(vmx->vcpu.kvm)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ vmx->vcpu.arch.rmode.active = 0;
+
+ vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
+ set_cr8(&vmx->vcpu, 0);
+ msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
+ if (vmx->vcpu.vcpu_id == 0)
+ msr |= MSR_IA32_APICBASE_BSP;
+ kvm_set_apic_base(&vmx->vcpu, msr);
+
+ fx_init(&vmx->vcpu);
+
+ /*
+ * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
+ * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh.
+ */
+ if (vmx->vcpu.vcpu_id == 0) {
+ vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
+ vmcs_writel(GUEST_CS_BASE, 0x000f0000);
+ } else {
+ vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
+ vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
+ }
+ vmcs_write32(GUEST_CS_LIMIT, 0xffff);
+ vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
+
+ seg_setup(VCPU_SREG_DS);
+ seg_setup(VCPU_SREG_ES);
+ seg_setup(VCPU_SREG_FS);
+ seg_setup(VCPU_SREG_GS);
+ seg_setup(VCPU_SREG_SS);
+
+ vmcs_write16(GUEST_TR_SELECTOR, 0);
+ vmcs_writel(GUEST_TR_BASE, 0);
+ vmcs_write32(GUEST_TR_LIMIT, 0xffff);
+ vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
+
+ vmcs_write16(GUEST_LDTR_SELECTOR, 0);
+ vmcs_writel(GUEST_LDTR_BASE, 0);
+ vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
+ vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
+
+ vmcs_write32(GUEST_SYSENTER_CS, 0);
+ vmcs_writel(GUEST_SYSENTER_ESP, 0);
+ vmcs_writel(GUEST_SYSENTER_EIP, 0);
+
+ vmcs_writel(GUEST_RFLAGS, 0x02);
+ if (vmx->vcpu.vcpu_id == 0)
+ vmcs_writel(GUEST_RIP, 0xfff0);
+ else
+ vmcs_writel(GUEST_RIP, 0);
+ vmcs_writel(GUEST_RSP, 0);
+
+ /* todo: dr0 = dr1 = dr2 = dr3 = 0; dr6 = 0xffff0ff0 */
+ vmcs_writel(GUEST_DR7, 0x400);
+
+ vmcs_writel(GUEST_GDTR_BASE, 0);
+ vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
+
+ vmcs_writel(GUEST_IDTR_BASE, 0);
+ vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
+
+ vmcs_write32(GUEST_ACTIVITY_STATE, 0);
+ vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
+ vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
+
+ guest_write_tsc(0);
+
+ /* Special registers */
+ vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
+
+ setup_msrs(vmx);
+
+ vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */
+
+ if (cpu_has_vmx_tpr_shadow()) {
+ vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
+ if (vm_need_tpr_shadow(vmx->vcpu.kvm))
+ vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
+ page_to_phys(vmx->vcpu.arch.apic->regs_page));
+ vmcs_write32(TPR_THRESHOLD, 0);
+ }
+
+ if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
+ vmcs_write64(APIC_ACCESS_ADDR,
+ page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
+
+ vmx->vcpu.arch.cr0 = 0x60000010;
+ vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */
+ vmx_set_cr4(&vmx->vcpu, 0);
+#ifdef CONFIG_X86_64
+ vmx_set_efer(&vmx->vcpu, 0);
+#endif
+ vmx_fpu_activate(&vmx->vcpu);
+ update_exception_bitmap(&vmx->vcpu);
+
+ return 0;
+
+out:
+ return ret;
+}
+
+static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+ if (vcpu->arch.rmode.active) {
+ vmx->rmode.irq.pending = true;
+ vmx->rmode.irq.vector = irq;
+ vmx->rmode.irq.rip = vmcs_readl(GUEST_RIP);
+ vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
+ irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK);
+ vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
+ vmcs_writel(GUEST_RIP, vmx->rmode.irq.rip - 1);
+ return;
+ }
+ vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
+ irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
+}
+
+static void kvm_do_inject_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);
+ vmx_inject_irq(vcpu, irq);
+}
+
+
+static void do_interrupt_requests(struct kvm_vcpu *vcpu,
+ struct kvm_run *kvm_run)
+{
+ u32 cpu_based_vm_exec_control;
+
+ vcpu->arch.interrupt_window_open =
+ ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
+ (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0);
+
+ if (vcpu->arch.interrupt_window_open &&
+ vcpu->arch.irq_summary &&
+ !(vmcs_read32(VM_ENTRY_INTR_INFO_FIELD) & INTR_INFO_VALID_MASK))
+ /*
+ * If interrupts enabled, and not blocked by sti or mov ss. Good.
+ */
+ kvm_do_inject_irq(vcpu);
+
+ cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
+ if (!vcpu->arch.interrupt_window_open &&
+ (vcpu->arch.irq_summary || kvm_run->request_interrupt_window))
+ /*
+ * Interrupts blocked. Wait for unblock.
+ */
+ cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
+ else
+ cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
+ vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
+}
+
+static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
+{
+ int ret;
+ struct kvm_userspace_memory_region tss_mem = {
+ .slot = 8,
+ .guest_phys_addr = addr,
+ .memory_size = PAGE_SIZE * 3,
+ .flags = 0,
+ };
+
+ ret = kvm_set_memory_region(kvm, &tss_mem, 0);
+ if (ret)
+ return ret;
+ kvm->arch.tss_addr = addr;
+ return 0;
+}
+
+static void kvm_guest_debug_pre(struct kvm_vcpu *vcpu)
+{
+ struct kvm_guest_debug *dbg = &vcpu->guest_debug;
+
+ set_debugreg(dbg->bp[0], 0);
+ set_debugreg(dbg->bp[1], 1);
+ set_debugreg(dbg->bp[2], 2);
+ set_debugreg(dbg->bp[3], 3);
+
+ if (dbg->singlestep) {
+ unsigned long flags;
+
+ flags = vmcs_readl(GUEST_RFLAGS);
+ flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
+ vmcs_writel(GUEST_RFLAGS, flags);
+ }
+}
+
+static int handle_rmode_exception(struct kvm_vcpu *vcpu,
+ int vec, u32 err_code)
+{
+ if (!vcpu->arch.rmode.active)
+ return 0;
+
+ /*
+ * Instruction with address size override prefix opcode 0x67
+ * Cause the #SS fault with 0 error code in VM86 mode.
+ */
+ if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
+ if (emulate_instruction(vcpu, NULL, 0, 0, 0) == EMULATE_DONE)
+ return 1;
+ return 0;
+}
+
+static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 intr_info, error_code;
+ unsigned long cr2, rip;
+ u32 vect_info;
+ enum emulation_result er;
+
+ vect_info = vmx->idt_vectoring_info;
+ intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
+
+ if ((vect_info & VECTORING_INFO_VALID_MASK) &&
+ !is_page_fault(intr_info))
+ printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
+ "intr info 0x%x\n", __FUNCTION__, vect_info, intr_info);
+
+ if (!irqchip_in_kernel(vcpu->kvm) && is_external_interrupt(vect_info)) {
+ int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
+ set_bit(irq, vcpu->arch.irq_pending);
+ set_bit(irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
+ }
+
+ if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) /* nmi */
+ return 1; /* already handled by vmx_vcpu_run() */
+
+ if (is_no_device(intr_info)) {
+ vmx_fpu_activate(vcpu);
+ return 1;
+ }
+
+ if (is_invalid_opcode(intr_info)) {
+ er = emulate_instruction(vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD);
+ if (er != EMULATE_DONE)
+ kvm_queue_exception(vcpu, UD_VECTOR);
+ return 1;
+ }
+
+ error_code = 0;
+ rip = vmcs_readl(GUEST_RIP);
+ if (intr_info & INTR_INFO_DELIEVER_CODE_MASK)
+ error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
+ if (is_page_fault(intr_info)) {
+ cr2 = vmcs_readl(EXIT_QUALIFICATION);
+ return kvm_mmu_page_fault(vcpu, cr2, error_code);
+ }
+
+ if (vcpu->arch.rmode.active &&
+ handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
+ error_code)) {
+ if (vcpu->arch.halt_request) {
+ vcpu->arch.halt_request = 0;
+ return kvm_emulate_halt(vcpu);
+ }
+ return 1;
+ }
+
+ if ((intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK)) ==
+ (INTR_TYPE_EXCEPTION | 1)) {
+ kvm_run->exit_reason = KVM_EXIT_DEBUG;
+ return 0;
+ }
+ kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
+ kvm_run->ex.exception = intr_info & INTR_INFO_VECTOR_MASK;
+ kvm_run->ex.error_code = error_code;
+ return 0;
+}
+
+static int handle_external_interrupt(struct kvm_vcpu *vcpu,
+ struct kvm_run *kvm_run)
+{
+ ++vcpu->stat.irq_exits;
+ return 1;
+}
+
+static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
+ return 0;
+}
+
+static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ unsigned long exit_qualification;
+ int size, down, in, string, rep;
+ unsigned port;
+
+ ++vcpu->stat.io_exits;
+ exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
+ string = (exit_qualification & 16) != 0;
+
+ if (string) {
+ if (emulate_instruction(vcpu,
+ kvm_run, 0, 0, 0) == EMULATE_DO_MMIO)
+ return 0;
+ return 1;
+ }
+
+ size = (exit_qualification & 7) + 1;
+ in = (exit_qualification & 8) != 0;
+ down = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
+ rep = (exit_qualification & 32) != 0;
+ port = exit_qualification >> 16;
+
+ return kvm_emulate_pio(vcpu, kvm_run, in, size, port);
+}
+
+static void
+vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
+{
+ /*
+ * Patch in the VMCALL instruction:
+ */
+ hypercall[0] = 0x0f;
+ hypercall[1] = 0x01;
+ hypercall[2] = 0xc1;
+}
+
+static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ unsigned long exit_qualification;
+ int cr;
+ int reg;
+
+ exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
+ cr = exit_qualification & 15;
+ reg = (exit_qualification >> 8) & 15;
+ switch ((exit_qualification >> 4) & 3) {
+ case 0: /* mov to cr */
+ switch (cr) {
+ case 0:
+ vcpu_load_rsp_rip(vcpu);
+ set_cr0(vcpu, vcpu->arch.regs[reg]);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ case 3:
+ vcpu_load_rsp_rip(vcpu);
+ set_cr3(vcpu, vcpu->arch.regs[reg]);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ case 4:
+ vcpu_load_rsp_rip(vcpu);
+ set_cr4(vcpu, vcpu->arch.regs[reg]);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ case 8:
+ vcpu_load_rsp_rip(vcpu);
+ set_cr8(vcpu, vcpu->arch.regs[reg]);
+ skip_emulated_instruction(vcpu);
+ if (irqchip_in_kernel(vcpu->kvm))
+ return 1;
+ kvm_run->exit_reason = KVM_EXIT_SET_TPR;
+ return 0;
+ };
+ break;
+ case 2: /* clts */
+ vcpu_load_rsp_rip(vcpu);
+ vmx_fpu_deactivate(vcpu);
+ vcpu->arch.cr0 &= ~X86_CR0_TS;
+ vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
+ vmx_fpu_activate(vcpu);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ case 1: /*mov from cr*/
+ switch (cr) {
+ case 3:
+ vcpu_load_rsp_rip(vcpu);
+ vcpu->arch.regs[reg] = vcpu->arch.cr3;
+ vcpu_put_rsp_rip(vcpu);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ case 8:
+ vcpu_load_rsp_rip(vcpu);
+ vcpu->arch.regs[reg] = get_cr8(vcpu);
+ vcpu_put_rsp_rip(vcpu);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ }
+ break;
+ case 3: /* lmsw */
+ lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
+
+ skip_emulated_instruction(vcpu);
+ return 1;
+ default:
+ break;
+ }
+ kvm_run->exit_reason = 0;
+ pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
+ (int)(exit_qualification >> 4) & 3, cr);
+ return 0;
+}
+
+static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ unsigned long exit_qualification;
+ unsigned long val;
+ int dr, reg;
+
+ /*
+ * FIXME: this code assumes the host is debugging the guest.
+ * need to deal with guest debugging itself too.
+ */
+ exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
+ dr = exit_qualification & 7;
+ reg = (exit_qualification >> 8) & 15;
+ vcpu_load_rsp_rip(vcpu);
+ if (exit_qualification & 16) {
+ /* mov from dr */
+ switch (dr) {
+ case 6:
+ val = 0xffff0ff0;
+ break;
+ case 7:
+ val = 0x400;
+ break;
+ default:
+ val = 0;
+ }
+ vcpu->arch.regs[reg] = val;
+ } else {
+ /* mov to dr */
+ }
+ vcpu_put_rsp_rip(vcpu);
+ skip_emulated_instruction(vcpu);
+ return 1;
+}
+
+static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ kvm_emulate_cpuid(vcpu);
+ return 1;
+}
+
+static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
+ u64 data;
+
+ if (vmx_get_msr(vcpu, ecx, &data)) {
+ kvm_inject_gp(vcpu, 0);
+ return 1;
+ }
+
+ /* FIXME: handling of bits 32:63 of rax, rdx */
+ vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
+ vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
+ skip_emulated_instruction(vcpu);
+ return 1;
+}
+
+static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
+ u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
+ | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
+
+ if (vmx_set_msr(vcpu, ecx, data) != 0) {
+ kvm_inject_gp(vcpu, 0);
+ return 1;
+ }
+
+ skip_emulated_instruction(vcpu);
+ return 1;
+}
+
+static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu,
+ struct kvm_run *kvm_run)
+{
+ return 1;
+}
+
+static int handle_interrupt_window(struct kvm_vcpu *vcpu,
+ struct kvm_run *kvm_run)
+{
+ u32 cpu_based_vm_exec_control;
+
+ /* clear pending irq */
+ cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
+ cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
+ vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
+ /*
+ * If the user space waits to inject interrupts, exit as soon as
+ * possible
+ */
+ if (kvm_run->request_interrupt_window &&
+ !vcpu->arch.irq_summary) {
+ kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
+ ++vcpu->stat.irq_window_exits;
+ return 0;
+ }
+ return 1;
+}
+
+static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ skip_emulated_instruction(vcpu);
+ return kvm_emulate_halt(vcpu);
+}
+
+static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ skip_emulated_instruction(vcpu);
+ kvm_emulate_hypercall(vcpu);
+ return 1;
+}
+
+static int handle_wbinvd(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ skip_emulated_instruction(vcpu);
+ /* TODO: Add support for VT-d/pass-through device */
+ return 1;
+}
+
+static int handle_apic_access(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ u64 exit_qualification;
+ enum emulation_result er;
+ unsigned long offset;
+
+ exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
+ offset = exit_qualification & 0xffful;
+
+ er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
+
+ if (er != EMULATE_DONE) {
+ printk(KERN_ERR
+ "Fail to handle apic access vmexit! Offset is 0x%lx\n",
+ offset);
+ return -ENOTSUPP;
+ }
+ return 1;
+}
+
+/*
+ * The exit handlers return 1 if the exit was handled fully and guest execution
+ * may resume. Otherwise they set the kvm_run parameter to indicate what needs
+ * to be done to userspace and return 0.
+ */
+static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
+ struct kvm_run *kvm_run) = {
+ [EXIT_REASON_EXCEPTION_NMI] = handle_exception,
+ [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt,
+ [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault,
+ [EXIT_REASON_IO_INSTRUCTION] = handle_io,
+ [EXIT_REASON_CR_ACCESS] = handle_cr,
+ [EXIT_REASON_DR_ACCESS] = handle_dr,
+ [EXIT_REASON_CPUID] = handle_cpuid,
+ [EXIT_REASON_MSR_READ] = handle_rdmsr,
+ [EXIT_REASON_MSR_WRITE] = handle_wrmsr,
+ [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window,
+ [EXIT_REASON_HLT] = handle_halt,
+ [EXIT_REASON_VMCALL] = handle_vmcall,
+ [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold,
+ [EXIT_REASON_APIC_ACCESS] = handle_apic_access,
+ [EXIT_REASON_WBINVD] = handle_wbinvd,
+};
+
+static const int kvm_vmx_max_exit_handlers =
+ ARRAY_SIZE(kvm_vmx_exit_handlers);
+
+/*
+ * The guest has exited. See if we can fix it or if we need userspace
+ * assistance.
+ */
+static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
+{
+ u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 vectoring_info = vmx->idt_vectoring_info;
+
+ if (unlikely(vmx->fail)) {
+ kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
+ kvm_run->fail_entry.hardware_entry_failure_reason
+ = vmcs_read32(VM_INSTRUCTION_ERROR);
+ return 0;
+ }
+
+ if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
+ exit_reason != EXIT_REASON_EXCEPTION_NMI)
+ printk(KERN_WARNING "%s: unexpected, valid vectoring info and "
+ "exit reason is 0x%x\n", __FUNCTION__, exit_reason);
+ if (exit_reason < kvm_vmx_max_exit_handlers
+ && kvm_vmx_exit_handlers[exit_reason])
+ return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run);
+ else {
+ kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
+ kvm_run->hw.hardware_exit_reason = exit_reason;
+ }
+ return 0;
+}
+
+static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
+{
+}
+
+static void update_tpr_threshold(struct kvm_vcpu *vcpu)
+{
+ int max_irr, tpr;
+
+ if (!vm_need_tpr_shadow(vcpu->kvm))
+ return;
+
+ if (!kvm_lapic_enabled(vcpu) ||
+ ((max_irr = kvm_lapic_find_highest_irr(vcpu)) == -1)) {
+ vmcs_write32(TPR_THRESHOLD, 0);
+ return;
+ }
+
+ tpr = (kvm_lapic_get_cr8(vcpu) & 0x0f) << 4;
+ vmcs_write32(TPR_THRESHOLD, (max_irr > tpr) ? tpr >> 4 : max_irr >> 4);
+}
+
+static void enable_irq_window(struct kvm_vcpu *vcpu)
+{
+ u32 cpu_based_vm_exec_control;
+
+ cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
+ cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
+ vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
+}
+
+static void vmx_intr_assist(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 idtv_info_field, intr_info_field;
+ int has_ext_irq, interrupt_window_open;
+ int vector;
+
+ update_tpr_threshold(vcpu);
+
+ has_ext_irq = kvm_cpu_has_interrupt(vcpu);
+ intr_info_field = vmcs_read32(VM_ENTRY_INTR_INFO_FIELD);
+ idtv_info_field = vmx->idt_vectoring_info;
+ if (intr_info_field & INTR_INFO_VALID_MASK) {
+ if (idtv_info_field & INTR_INFO_VALID_MASK) {
+ /* TODO: fault when IDT_Vectoring */
+ if (printk_ratelimit())
+ printk(KERN_ERR "Fault when IDT_Vectoring\n");
+ }
+ if (has_ext_irq)
+ enable_irq_window(vcpu);
+ return;
+ }
+ if (unlikely(idtv_info_field & INTR_INFO_VALID_MASK)) {
+ if ((idtv_info_field & VECTORING_INFO_TYPE_MASK)
+ == INTR_TYPE_EXT_INTR
+ && vcpu->arch.rmode.active) {
+ u8 vect = idtv_info_field & VECTORING_INFO_VECTOR_MASK;
+
+ vmx_inject_irq(vcpu, vect);
+ if (unlikely(has_ext_irq))
+ enable_irq_window(vcpu);
+ return;
+ }
+
+ vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, idtv_info_field);
+ vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
+ vmcs_read32(VM_EXIT_INSTRUCTION_LEN));
+
+ if (unlikely(idtv_info_field & INTR_INFO_DELIEVER_CODE_MASK))
+ vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
+ vmcs_read32(IDT_VECTORING_ERROR_CODE));
+ if (unlikely(has_ext_irq))
+ enable_irq_window(vcpu);
+ return;
+ }
+ if (!has_ext_irq)
+ return;
+ interrupt_window_open =
+ ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
+ (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0);
+ if (interrupt_window_open) {
+ vector = kvm_cpu_get_interrupt(vcpu);
+ vmx_inject_irq(vcpu, vector);
+ kvm_timer_intr_post(vcpu, vector);
+ } else
+ enable_irq_window(vcpu);
+}
+
+/*
+ * Failure to inject an interrupt should give us the information
+ * in IDT_VECTORING_INFO_FIELD. However, if the failure occurs
+ * when fetching the interrupt redirection bitmap in the real-mode
+ * tss, this doesn't happen. So we do it ourselves.
+ */
+static void fixup_rmode_irq(struct vcpu_vmx *vmx)
+{
+ vmx->rmode.irq.pending = 0;
+ if (vmcs_readl(GUEST_RIP) + 1 != vmx->rmode.irq.rip)
+ return;
+ vmcs_writel(GUEST_RIP, vmx->rmode.irq.rip);
+ if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) {
+ vmx->idt_vectoring_info &= ~VECTORING_INFO_TYPE_MASK;
+ vmx->idt_vectoring_info |= INTR_TYPE_EXT_INTR;
+ return;
+ }
+ vmx->idt_vectoring_info =
+ VECTORING_INFO_VALID_MASK
+ | INTR_TYPE_EXT_INTR
+ | vmx->rmode.irq.vector;
+}
+
+static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 intr_info;
+
+ /*
+ * Loading guest fpu may have cleared host cr0.ts
+ */
+ vmcs_writel(HOST_CR0, read_cr0());
+
+ asm(
+ /* Store host registers */
+#ifdef CONFIG_X86_64
+ "push %%rdx; push %%rbp;"
+ "push %%rcx \n\t"
+#else
+ "push %%edx; push %%ebp;"
+ "push %%ecx \n\t"
+#endif
+ ASM_VMX_VMWRITE_RSP_RDX "\n\t"
+ /* Check if vmlaunch of vmresume is needed */
+ "cmpl $0, %c[launched](%0) \n\t"
+ /* Load guest registers. Don't clobber flags. */
+#ifdef CONFIG_X86_64
+ "mov %c[cr2](%0), %%rax \n\t"
+ "mov %%rax, %%cr2 \n\t"
+ "mov %c[rax](%0), %%rax \n\t"
+ "mov %c[rbx](%0), %%rbx \n\t"
+ "mov %c[rdx](%0), %%rdx \n\t"
+ "mov %c[rsi](%0), %%rsi \n\t"
+ "mov %c[rdi](%0), %%rdi \n\t"
+ "mov %c[rbp](%0), %%rbp \n\t"
+ "mov %c[r8](%0), %%r8 \n\t"
+ "mov %c[r9](%0), %%r9 \n\t"
+ "mov %c[r10](%0), %%r10 \n\t"
+ "mov %c[r11](%0), %%r11 \n\t"
+ "mov %c[r12](%0), %%r12 \n\t"
+ "mov %c[r13](%0), %%r13 \n\t"
+ "mov %c[r14](%0), %%r14 \n\t"
+ "mov %c[r15](%0), %%r15 \n\t"
+ "mov %c[rcx](%0), %%rcx \n\t" /* kills %0 (rcx) */
+#else
+ "mov %c[cr2](%0), %%eax \n\t"
+ "mov %%eax, %%cr2 \n\t"
+ "mov %c[rax](%0), %%eax \n\t"
+ "mov %c[rbx](%0), %%ebx \n\t"
+ "mov %c[rdx](%0), %%edx \n\t"
+ "mov %c[rsi](%0), %%esi \n\t"
+ "mov %c[rdi](%0), %%edi \n\t"
+ "mov %c[rbp](%0), %%ebp \n\t"
+ "mov %c[rcx](%0), %%ecx \n\t" /* kills %0 (ecx) */
+#endif
+ /* Enter guest mode */
+ "jne .Llaunched \n\t"
+ ASM_VMX_VMLAUNCH "\n\t"
+ "jmp .Lkvm_vmx_return \n\t"
+ ".Llaunched: " ASM_VMX_VMRESUME "\n\t"
+ ".Lkvm_vmx_return: "
+ /* Save guest registers, load host registers, keep flags */
+#ifdef CONFIG_X86_64
+ "xchg %0, (%%rsp) \n\t"
+ "mov %%rax, %c[rax](%0) \n\t"
+ "mov %%rbx, %c[rbx](%0) \n\t"
+ "pushq (%%rsp); popq %c[rcx](%0) \n\t"
+ "mov %%rdx, %c[rdx](%0) \n\t"
+ "mov %%rsi, %c[rsi](%0) \n\t"
+ "mov %%rdi, %c[rdi](%0) \n\t"
+ "mov %%rbp, %c[rbp](%0) \n\t"
+ "mov %%r8, %c[r8](%0) \n\t"
+ "mov %%r9, %c[r9](%0) \n\t"
+ "mov %%r10, %c[r10](%0) \n\t"
+ "mov %%r11, %c[r11](%0) \n\t"
+ "mov %%r12, %c[r12](%0) \n\t"
+ "mov %%r13, %c[r13](%0) \n\t"
+ "mov %%r14, %c[r14](%0) \n\t"
+ "mov %%r15, %c[r15](%0) \n\t"
+ "mov %%cr2, %%rax \n\t"
+ "mov %%rax, %c[cr2](%0) \n\t"
+
+ "pop %%rbp; pop %%rbp; pop %%rdx \n\t"
+#else
+ "xchg %0, (%%esp) \n\t"
+ "mov %%eax, %c[rax](%0) \n\t"
+ "mov %%ebx, %c[rbx](%0) \n\t"
+ "pushl (%%esp); popl %c[rcx](%0) \n\t"
+ "mov %%edx, %c[rdx](%0) \n\t"
+ "mov %%esi, %c[rsi](%0) \n\t"
+ "mov %%edi, %c[rdi](%0) \n\t"
+ "mov %%ebp, %c[rbp](%0) \n\t"
+ "mov %%cr2, %%eax \n\t"
+ "mov %%eax, %c[cr2](%0) \n\t"
+
+ "pop %%ebp; pop %%ebp; pop %%edx \n\t"
+#endif
+ "setbe %c[fail](%0) \n\t"
+ : : "c"(vmx), "d"((unsigned long)HOST_RSP),
+ [launched]"i"(offsetof(struct vcpu_vmx, launched)),
+ [fail]"i"(offsetof(struct vcpu_vmx, fail)),
+ [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
+ [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
+ [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
+ [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
+ [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
+ [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
+ [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
+#ifdef CONFIG_X86_64
+ [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
+ [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
+ [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
+ [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
+ [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
+ [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
+ [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
+ [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
+#endif
+ [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
+ : "cc", "memory"
+#ifdef CONFIG_X86_64
+ , "rbx", "rdi", "rsi"
+ , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
+#else
+ , "ebx", "edi", "rsi"
+#endif
+ );
+
+ vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
+ if (vmx->rmode.irq.pending)
+ fixup_rmode_irq(vmx);
+
+ vcpu->arch.interrupt_window_open =
+ (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0;
+
+ asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
+ vmx->launched = 1;
+
+ intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
+
+ /* We need to handle NMIs before interrupts are enabled */
+ if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) /* nmi */
+ asm("int $2");
+}
+
+static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+ if (vmx->vmcs) {
+ on_each_cpu(__vcpu_clear, vmx, 0, 1);
+ free_vmcs(vmx->vmcs);
+ vmx->vmcs = NULL;
+ }
+}
+
+static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+ vmx_free_vmcs(vcpu);
+ kfree(vmx->host_msrs);
+ kfree(vmx->guest_msrs);
+ kvm_vcpu_uninit(vcpu);
+ kmem_cache_free(kvm_vcpu_cache, vmx);
+}
+
+static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
+{
+ int err;
+ struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
+ int cpu;
+
+ if (!vmx)
+ return ERR_PTR(-ENOMEM);
+
+ err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
+ if (err)
+ goto free_vcpu;
+
+ vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!vmx->guest_msrs) {
+ err = -ENOMEM;
+ goto uninit_vcpu;
+ }
+
+ vmx->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!vmx->host_msrs)
+ goto free_guest_msrs;
+
+ vmx->vmcs = alloc_vmcs();
+ if (!vmx->vmcs)
+ goto free_msrs;
+
+ vmcs_clear(vmx->vmcs);
+
+ cpu = get_cpu();
+ vmx_vcpu_load(&vmx->vcpu, cpu);
+ err = vmx_vcpu_setup(vmx);
+ vmx_vcpu_put(&vmx->vcpu);
+ put_cpu();
+ if (err)
+ goto free_vmcs;
+
+ return &vmx->vcpu;
+
+free_vmcs:
+ free_vmcs(vmx->vmcs);
+free_msrs:
+ kfree(vmx->host_msrs);
+free_guest_msrs:
+ kfree(vmx->guest_msrs);
+uninit_vcpu:
+ kvm_vcpu_uninit(&vmx->vcpu);
+free_vcpu:
+ kmem_cache_free(kvm_vcpu_cache, vmx);
+ return ERR_PTR(err);
+}
+
+static void __init vmx_check_processor_compat(void *rtn)
+{
+ struct vmcs_config vmcs_conf;
+
+ *(int *)rtn = 0;
+ if (setup_vmcs_config(&vmcs_conf) < 0)
+ *(int *)rtn = -EIO;
+ if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
+ printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
+ smp_processor_id());
+ *(int *)rtn = -EIO;
+ }
+}
+
+static struct kvm_x86_ops vmx_x86_ops = {
+ .cpu_has_kvm_support = cpu_has_kvm_support,
+ .disabled_by_bios = vmx_disabled_by_bios,
+ .hardware_setup = hardware_setup,
+ .hardware_unsetup = hardware_unsetup,
+ .check_processor_compatibility = vmx_check_processor_compat,
+ .hardware_enable = hardware_enable,
+ .hardware_disable = hardware_disable,
+ .cpu_has_accelerated_tpr = cpu_has_vmx_virtualize_apic_accesses,
+
+ .vcpu_create = vmx_create_vcpu,
+ .vcpu_free = vmx_free_vcpu,
+ .vcpu_reset = vmx_vcpu_reset,
+
+ .prepare_guest_switch = vmx_save_host_state,
+ .vcpu_load = vmx_vcpu_load,
+ .vcpu_put = vmx_vcpu_put,
+ .vcpu_decache = vmx_vcpu_decache,
+
+ .set_guest_debug = set_guest_debug,
+ .guest_debug_pre = kvm_guest_debug_pre,
+ .get_msr = vmx_get_msr,
+ .set_msr = vmx_set_msr,
+ .get_segment_base = vmx_get_segment_base,
+ .get_segment = vmx_get_segment,
+ .set_segment = vmx_set_segment,
+ .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
+ .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
+ .set_cr0 = vmx_set_cr0,
+ .set_cr3 = vmx_set_cr3,
+ .set_cr4 = vmx_set_cr4,
+#ifdef CONFIG_X86_64
+ .set_efer = vmx_set_efer,
+#endif
+ .get_idt = vmx_get_idt,
+ .set_idt = vmx_set_idt,
+ .get_gdt = vmx_get_gdt,
+ .set_gdt = vmx_set_gdt,
+ .cache_regs = vcpu_load_rsp_rip,
+ .decache_regs = vcpu_put_rsp_rip,
+ .get_rflags = vmx_get_rflags,
+ .set_rflags = vmx_set_rflags,
+
+ .tlb_flush = vmx_flush_tlb,
+
+ .run = vmx_vcpu_run,
+ .handle_exit = kvm_handle_exit,
+ .skip_emulated_instruction = skip_emulated_instruction,
+ .patch_hypercall = vmx_patch_hypercall,
+ .get_irq = vmx_get_irq,
+ .set_irq = vmx_inject_irq,
+ .queue_exception = vmx_queue_exception,
+ .exception_injected = vmx_exception_injected,
+ .inject_pending_irq = vmx_intr_assist,
+ .inject_pending_vectors = do_interrupt_requests,
+
+ .set_tss_addr = vmx_set_tss_addr,
+};
+
+static int __init vmx_init(void)
+{
+ void *iova;
+ int r;
+
+ vmx_io_bitmap_a = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
+ if (!vmx_io_bitmap_a)
+ return -ENOMEM;
+
+ vmx_io_bitmap_b = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
+ if (!vmx_io_bitmap_b) {
+ r = -ENOMEM;
+ goto out;
+ }
+
+ /*
+ * Allow direct access to the PC debug port (it is often used for I/O
+ * delays, but the vmexits simply slow things down).
+ */
+ iova = kmap(vmx_io_bitmap_a);
+ memset(iova, 0xff, PAGE_SIZE);
+ clear_bit(0x80, iova);
+ kunmap(vmx_io_bitmap_a);
+
+ iova = kmap(vmx_io_bitmap_b);
+ memset(iova, 0xff, PAGE_SIZE);
+ kunmap(vmx_io_bitmap_b);
+
+ r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE);
+ if (r)
+ goto out1;
+
+ if (bypass_guest_pf)
+ kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);
+
+ return 0;
+
+out1:
+ __free_page(vmx_io_bitmap_b);
+out:
+ __free_page(vmx_io_bitmap_a);
+ return r;
+}
+
+static void __exit vmx_exit(void)
+{
+ __free_page(vmx_io_bitmap_b);
+ __free_page(vmx_io_bitmap_a);
+
+ kvm_exit();
+}
+
+module_init(vmx_init)
+module_exit(vmx_exit)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.