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Subject[PATCH 15/38] KVM: Move the vmx exit handlers to vmx.c
From
Date
Signed-off-by: Avi Kivity <avi@qumranet.com>

Index: linux-2.6/drivers/kvm/kvm.h
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm.h
+++ linux-2.6/drivers/kvm/kvm.h
@@ -266,6 +266,7 @@ struct kvm_arch_ops {
void (*decache_regs)(struct kvm_vcpu *vcpu);

int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
+ void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
unsigned long vmx_return; /* temporary hack */
};

@@ -300,6 +301,14 @@ static inline struct page *gfn_to_page(s
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);

+enum emulation_result {
+ EMULATE_DONE, /* no further processing */
+ EMULATE_DO_MMIO, /* kvm_run filled with mmio request */
+ EMULATE_FAIL, /* can't emulate this instruction */
+};
+
+int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ unsigned long cr2, u16 error_code);
void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
@@ -309,10 +318,22 @@ unsigned long realmode_get_cr(struct kvm
void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
unsigned long *rflags);

+void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
+void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
+void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
+void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
+void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
+
+void inject_gp(struct kvm_vcpu *vcpu);
+
+#ifdef __x86_64__
+void set_efer(struct kvm_vcpu *vcpu, u64 efer);
+#endif
+
+
void load_msrs(struct vmx_msr_entry *e, int n);
void save_msrs(struct vmx_msr_entry *e, int n);
void kvm_resched(struct kvm_vcpu *vcpu);
-int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);

int kvm_read_guest(struct kvm_vcpu *vcpu,
gva_t addr,
Index: linux-2.6/drivers/kvm/kvm_main.c
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm_main.c
+++ linux-2.6/drivers/kvm/kvm_main.c
@@ -533,7 +533,7 @@ void vmcs_writel(unsigned long field, un
}
EXPORT_SYMBOL_GPL(vmcs_writel);

-static void inject_gp(struct kvm_vcpu *vcpu)
+void inject_gp(struct kvm_vcpu *vcpu)
{
printk(KERN_DEBUG "inject_general_protection: rip 0x%lx\n",
vmcs_readl(GUEST_RIP));
@@ -544,6 +544,7 @@ static void inject_gp(struct kvm_vcpu *v
INTR_INFO_DELIEVER_CODE_MASK |
INTR_INFO_VALID_MASK);
}
+EXPORT_SYMBOL_GPL(inject_gp);

/*
* reads and returns guest's timestamp counter "register"
@@ -821,7 +822,7 @@ static int pdptrs_have_reserved_bits_set
return i != 4;
}

-static void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
+void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
if (cr0 & CR0_RESEVED_BITS) {
printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
@@ -879,8 +880,9 @@ static void set_cr0(struct kvm_vcpu *vcp
spin_unlock(&vcpu->kvm->lock);
return;
}
+EXPORT_SYMBOL_GPL(set_cr0);

-static void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
+void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
{
unsigned long cr0 = vcpu->cr0;

@@ -895,6 +897,7 @@ static void lmsw(struct kvm_vcpu *vcpu,
| (msw & LMSW_GUEST_MASK));
vcpu->cr0 = (vcpu->cr0 & ~0xfffful) | msw;
}
+EXPORT_SYMBOL_GPL(lmsw);

static void __set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
@@ -904,7 +907,7 @@ static void __set_cr4(struct kvm_vcpu *v
vcpu->cr4 = cr4;
}

-static void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
+void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
if (cr4 & CR4_RESEVED_BITS) {
printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
@@ -935,8 +938,9 @@ static void set_cr4(struct kvm_vcpu *vcp
kvm_mmu_reset_context(vcpu);
spin_unlock(&vcpu->kvm->lock);
}
+EXPORT_SYMBOL_GPL(set_cr4);

-static void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
+void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
if (is_long_mode()) {
if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
@@ -964,8 +968,9 @@ static void set_cr3(struct kvm_vcpu *vcp
vcpu->mmu.new_cr3(vcpu);
spin_unlock(&vcpu->kvm->lock);
}
+EXPORT_SYMBOL_GPL(set_cr3);

-static void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
+void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
{
if ( cr8 & CR8_RESEVED_BITS) {
printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
@@ -974,6 +979,7 @@ static void set_cr8(struct kvm_vcpu *vcp
}
vcpu->cr8 = cr8;
}
+EXPORT_SYMBOL_GPL(set_cr8);

static u32 get_rdx_init_val(void)
{
@@ -1534,25 +1540,6 @@ void mark_page_dirty(struct kvm *kvm, gf
}
}

-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);
-}
-
static int emulator_read_std(unsigned long addr,
unsigned long *val,
unsigned int bytes,
@@ -1694,16 +1681,10 @@ struct x86_emulate_ops emulate_ops = {
.cmpxchg_emulated = emulator_cmpxchg_emulated,
};

-enum emulation_result {
- EMULATE_DONE, /* no further processing */
- EMULATE_DO_MMIO, /* kvm_run filled with mmio request */
- EMULATE_FAIL, /* can't emulate this instruction */
-};
-
-static int emulate_instruction(struct kvm_vcpu *vcpu,
- struct kvm_run *run,
- unsigned long cr2,
- u16 error_code)
+int emulate_instruction(struct kvm_vcpu *vcpu,
+ struct kvm_run *run,
+ unsigned long cr2,
+ u16 error_code)
{
struct x86_emulate_ctxt emulate_ctxt;
int r;
@@ -1762,6 +1743,7 @@ static int emulate_instruction(struct kv

return EMULATE_DONE;
}
+EXPORT_SYMBOL_GPL(emulate_instruction);

static u64 mk_cr_64(u64 curr_cr, u32 new_val)
{
@@ -1826,298 +1808,6 @@ void realmode_set_cr(struct kvm_vcpu *vc
}
}

-static int handle_rmode_exception(struct kvm_vcpu *vcpu,
- int vec, u32 err_code)
-{
- if (!vcpu->rmode.active)
- return 0;
-
- if (vec == GP_VECTOR && err_code == 0)
- if (emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE)
- return 1;
- return 0;
-}
-
-static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
-{
- u32 intr_info, error_code;
- unsigned long cr2, rip;
- u32 vect_info;
- enum emulation_result er;
-
- vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
- 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 (is_external_interrupt(vect_info)) {
- int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
- set_bit(irq, vcpu->irq_pending);
- set_bit(irq / BITS_PER_LONG, &vcpu->irq_summary);
- }
-
- if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) { /* nmi */
- asm ("int $2");
- 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);
-
- spin_lock(&vcpu->kvm->lock);
- if (!vcpu->mmu.page_fault(vcpu, cr2, error_code)) {
- spin_unlock(&vcpu->kvm->lock);
- return 1;
- }
-
- er = emulate_instruction(vcpu, kvm_run, cr2, 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();
- }
- }
-
- if (vcpu->rmode.active &&
- handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
- error_code))
- 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)
-{
- ++kvm_stat.irq_exits;
- return 1;
-}
-
-
-static int get_io_count(struct kvm_vcpu *vcpu, u64 *count)
-{
- u64 inst;
- gva_t rip;
- int countr_size;
- int i, n;
-
- if ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_VM)) {
- countr_size = 2;
- } else {
- u32 cs_ar = vmcs_read32(GUEST_CS_AR_BYTES);
-
- countr_size = (cs_ar & AR_L_MASK) ? 8:
- (cs_ar & AR_DB_MASK) ? 4: 2;
- }
-
- rip = vmcs_readl(GUEST_RIP);
- if (countr_size != 8)
- rip += vmcs_readl(GUEST_CS_BASE);
-
- n = kvm_read_guest(vcpu, rip, sizeof(inst), &inst);
-
- for (i = 0; i < n; i++) {
- switch (((u8*)&inst)[i]) {
- case 0xf0:
- case 0xf2:
- case 0xf3:
- case 0x2e:
- case 0x36:
- case 0x3e:
- case 0x26:
- case 0x64:
- case 0x65:
- case 0x66:
- break;
- case 0x67:
- countr_size = (countr_size == 2) ? 4: (countr_size >> 1);
- default:
- goto done;
- }
- }
- return 0;
-done:
- countr_size *= 8;
- *count = vcpu->regs[VCPU_REGS_RCX] & (~0ULL >> (64 - countr_size));
- return 1;
-}
-
-static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
-{
- u64 exit_qualification;
-
- ++kvm_stat.io_exits;
- exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
- kvm_run->exit_reason = KVM_EXIT_IO;
- if (exit_qualification & 8)
- kvm_run->io.direction = KVM_EXIT_IO_IN;
- else
- kvm_run->io.direction = KVM_EXIT_IO_OUT;
- kvm_run->io.size = (exit_qualification & 7) + 1;
- kvm_run->io.string = (exit_qualification & 16) != 0;
- kvm_run->io.string_down
- = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
- kvm_run->io.rep = (exit_qualification & 32) != 0;
- kvm_run->io.port = exit_qualification >> 16;
- if (kvm_run->io.string) {
- if (!get_io_count(vcpu, &kvm_run->io.count))
- return 1;
- kvm_run->io.address = vmcs_readl(GUEST_LINEAR_ADDRESS);
- } else
- kvm_run->io.value = vcpu->regs[VCPU_REGS_RAX]; /* rax */
- return 0;
-}
-
-static int handle_invlpg(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
-{
- u64 address = vmcs_read64(EXIT_QUALIFICATION);
- int instruction_length = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
- spin_lock(&vcpu->kvm->lock);
- vcpu->mmu.inval_page(vcpu, address);
- spin_unlock(&vcpu->kvm->lock);
- vmcs_writel(GUEST_RIP, vmcs_readl(GUEST_RIP) + instruction_length);
- return 1;
-}
-
-static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
-{
- u64 exit_qualification;
- int cr;
- int reg;
-
-#ifdef KVM_DEBUG
- if (guest_cpl() != 0) {
- vcpu_printf(vcpu, "%s: not supervisor\n", __FUNCTION__);
- inject_gp(vcpu);
- return 1;
- }
-#endif
-
- exit_qualification = vmcs_read64(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:
- kvm_arch_ops->cache_regs(vcpu);
- set_cr0(vcpu, vcpu->regs[reg]);
- skip_emulated_instruction(vcpu);
- return 1;
- case 3:
- kvm_arch_ops->cache_regs(vcpu);
- set_cr3(vcpu, vcpu->regs[reg]);
- skip_emulated_instruction(vcpu);
- return 1;
- case 4:
- kvm_arch_ops->cache_regs(vcpu);
- set_cr4(vcpu, vcpu->regs[reg]);
- skip_emulated_instruction(vcpu);
- return 1;
- case 8:
- kvm_arch_ops->cache_regs(vcpu);
- set_cr8(vcpu, vcpu->regs[reg]);
- skip_emulated_instruction(vcpu);
- return 1;
- };
- break;
- case 1: /*mov from cr*/
- switch (cr) {
- case 3:
- kvm_arch_ops->cache_regs(vcpu);
- vcpu->regs[reg] = vcpu->cr3;
- kvm_arch_ops->decache_regs(vcpu);
- skip_emulated_instruction(vcpu);
- return 1;
- case 8:
- printk(KERN_DEBUG "handle_cr: read CR8 "
- "cpu erratum AA15\n");
- kvm_arch_ops->cache_regs(vcpu);
- vcpu->regs[reg] = vcpu->cr8;
- kvm_arch_ops->decache_regs(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;
- printk(KERN_ERR "kvm: 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)
-{
- u64 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_read64(EXIT_QUALIFICATION);
- dr = exit_qualification & 7;
- reg = (exit_qualification >> 8) & 15;
- kvm_arch_ops->cache_regs(vcpu);
- if (exit_qualification & 16) {
- /* mov from dr */
- switch (dr) {
- case 6:
- val = 0xffff0ff0;
- break;
- case 7:
- val = 0x400;
- break;
- default:
- val = 0;
- }
- vcpu->regs[reg] = val;
- } else {
- /* mov to dr */
- }
- kvm_arch_ops->decache_regs(vcpu);
- skip_emulated_instruction(vcpu);
- return 1;
-}
-
-static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
-{
- kvm_run->exit_reason = KVM_EXIT_CPUID;
- return 0;
-}
-
/*
* Reads an msr value (of 'msr_index') into 'pdata'.
* Returns 0 on success, non-0 otherwise.
@@ -2128,23 +1818,6 @@ static int get_msr(struct kvm_vcpu *vcpu
return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
}

-static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
-{
- u32 ecx = vcpu->regs[VCPU_REGS_RCX];
- u64 data;
-
- if (get_msr(vcpu, ecx, &data)) {
- inject_gp(vcpu);
- return 1;
- }
-
- /* FIXME: handling of bits 32:63 of rax, rdx */
- vcpu->regs[VCPU_REGS_RAX] = data & -1u;
- vcpu->regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
- skip_emulated_instruction(vcpu);
- return 1;
-}
-
#ifdef __x86_64__

void set_efer(struct kvm_vcpu *vcpu, u64 efer)
@@ -2175,7 +1848,6 @@ void set_efer(struct kvm_vcpu *vcpu, u64
if (!(efer & EFER_LMA))
efer &= ~EFER_LME;
msr->data = efer;
- skip_emulated_instruction(vcpu);
}
EXPORT_SYMBOL_GPL(set_efer);

@@ -2191,90 +1863,6 @@ static int set_msr(struct kvm_vcpu *vcpu
return kvm_arch_ops->set_msr(vcpu, msr_index, data);
}

-static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
-{
- u32 ecx = vcpu->regs[VCPU_REGS_RCX];
- u64 data = (vcpu->regs[VCPU_REGS_RAX] & -1u)
- | ((u64)(vcpu->regs[VCPU_REGS_RDX] & -1u) << 32);
-
- if (set_msr(vcpu, ecx, data) != 0) {
- inject_gp(vcpu);
- return 1;
- }
-
- if (ecx != MSR_EFER)
- skip_emulated_instruction(vcpu);
- return 1;
-}
-
-static int handle_interrupt_window(struct kvm_vcpu *vcpu,
- struct kvm_run *kvm_run)
-{
- /* Turn off interrupt window reporting. */
- vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
- vmcs_read32(CPU_BASED_VM_EXEC_CONTROL)
- & ~CPU_BASED_VIRTUAL_INTR_PENDING);
- return 1;
-}
-
-static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
-{
- skip_emulated_instruction(vcpu);
- if (vcpu->irq_summary && (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF))
- return 1;
-
- kvm_run->exit_reason = KVM_EXIT_HLT;
- return 0;
-}
-
-/*
- * 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_IO_INSTRUCTION] = handle_io,
- [EXIT_REASON_INVLPG] = handle_invlpg,
- [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,
-};
-
-static const int kvm_vmx_max_exit_handlers =
- sizeof(kvm_vmx_exit_handlers) / sizeof(*kvm_vmx_exit_handlers);
-
-/*
- * The guest has exited. See if we can fix it or if we need userspace
- * assistance.
- */
-int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
-{
- u32 vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
- u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
-
- 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);
- kvm_run->instruction_length = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
- 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;
-}
-EXPORT_SYMBOL_GPL(kvm_handle_exit);
-
void kvm_resched(struct kvm_vcpu *vcpu)
{
vcpu_put(vcpu);
@@ -2315,7 +1903,7 @@ static int kvm_dev_ioctl_run(struct kvm
return -ENOENT;

if (kvm_run->emulated) {
- skip_emulated_instruction(vcpu);
+ kvm_arch_ops->skip_emulated_instruction(vcpu);
kvm_run->emulated = 0;
}

Index: linux-2.6/drivers/kvm/vmx.c
===================================================================
--- linux-2.6.orig/drivers/kvm/vmx.c
+++ linux-2.6/drivers/kvm/vmx.c
@@ -44,11 +44,24 @@ u64 guest_read_tsc(void);
void guest_write_tsc(u64 guest_tsc);
struct vmx_msr_entry *find_msr_entry(struct kvm_vcpu *vcpu, u32 msr);

-#ifdef __x86_64__
+static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
+{
+ unsigned long rip;
+ u32 interruptibility;

-void set_efer(struct kvm_vcpu *vcpu, u64 efer);
+ rip = vmcs_readl(GUEST_RIP);
+ rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
+ vmcs_writel(GUEST_RIP, rip);

-#endif
+ /*
+ * 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);
+}

static void reload_tss(void)
{
@@ -521,6 +534,397 @@ static void kvm_guest_debug_pre(struct k
}
}

+static int handle_rmode_exception(struct kvm_vcpu *vcpu,
+ int vec, u32 err_code)
+{
+ if (!vcpu->rmode.active)
+ return 0;
+
+ if (vec == GP_VECTOR && err_code == 0)
+ if (emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE)
+ return 1;
+ return 0;
+}
+
+static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ u32 intr_info, error_code;
+ unsigned long cr2, rip;
+ u32 vect_info;
+ enum emulation_result er;
+
+ vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
+ 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 (is_external_interrupt(vect_info)) {
+ int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
+ set_bit(irq, vcpu->irq_pending);
+ set_bit(irq / BITS_PER_LONG, &vcpu->irq_summary);
+ }
+
+ if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) { /* nmi */
+ asm ("int $2");
+ 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);
+
+ spin_lock(&vcpu->kvm->lock);
+ if (!vcpu->mmu.page_fault(vcpu, cr2, error_code)) {
+ spin_unlock(&vcpu->kvm->lock);
+ return 1;
+ }
+
+ er = emulate_instruction(vcpu, kvm_run, cr2, 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();
+ }
+ }
+
+ if (vcpu->rmode.active &&
+ handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
+ error_code))
+ 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)
+{
+ ++kvm_stat.irq_exits;
+ return 1;
+}
+
+
+static int get_io_count(struct kvm_vcpu *vcpu, u64 *count)
+{
+ u64 inst;
+ gva_t rip;
+ int countr_size;
+ int i, n;
+
+ if ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_VM)) {
+ countr_size = 2;
+ } else {
+ u32 cs_ar = vmcs_read32(GUEST_CS_AR_BYTES);
+
+ countr_size = (cs_ar & AR_L_MASK) ? 8:
+ (cs_ar & AR_DB_MASK) ? 4: 2;
+ }
+
+ rip = vmcs_readl(GUEST_RIP);
+ if (countr_size != 8)
+ rip += vmcs_readl(GUEST_CS_BASE);
+
+ n = kvm_read_guest(vcpu, rip, sizeof(inst), &inst);
+
+ for (i = 0; i < n; i++) {
+ switch (((u8*)&inst)[i]) {
+ case 0xf0:
+ case 0xf2:
+ case 0xf3:
+ case 0x2e:
+ case 0x36:
+ case 0x3e:
+ case 0x26:
+ case 0x64:
+ case 0x65:
+ case 0x66:
+ break;
+ case 0x67:
+ countr_size = (countr_size == 2) ? 4: (countr_size >> 1);
+ default:
+ goto done;
+ }
+ }
+ return 0;
+done:
+ countr_size *= 8;
+ *count = vcpu->regs[VCPU_REGS_RCX] & (~0ULL >> (64 - countr_size));
+ return 1;
+}
+
+static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ u64 exit_qualification;
+
+ ++kvm_stat.io_exits;
+ exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
+ kvm_run->exit_reason = KVM_EXIT_IO;
+ if (exit_qualification & 8)
+ kvm_run->io.direction = KVM_EXIT_IO_IN;
+ else
+ kvm_run->io.direction = KVM_EXIT_IO_OUT;
+ kvm_run->io.size = (exit_qualification & 7) + 1;
+ kvm_run->io.string = (exit_qualification & 16) != 0;
+ kvm_run->io.string_down
+ = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
+ kvm_run->io.rep = (exit_qualification & 32) != 0;
+ kvm_run->io.port = exit_qualification >> 16;
+ if (kvm_run->io.string) {
+ if (!get_io_count(vcpu, &kvm_run->io.count))
+ return 1;
+ kvm_run->io.address = vmcs_readl(GUEST_LINEAR_ADDRESS);
+ } else
+ kvm_run->io.value = vcpu->regs[VCPU_REGS_RAX]; /* rax */
+ return 0;
+}
+
+static int handle_invlpg(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ u64 address = vmcs_read64(EXIT_QUALIFICATION);
+ int instruction_length = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
+ spin_lock(&vcpu->kvm->lock);
+ vcpu->mmu.inval_page(vcpu, address);
+ spin_unlock(&vcpu->kvm->lock);
+ vmcs_writel(GUEST_RIP, vmcs_readl(GUEST_RIP) + instruction_length);
+ return 1;
+}
+
+static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ u64 exit_qualification;
+ int cr;
+ int reg;
+
+#ifdef KVM_DEBUG
+ if (guest_cpl() != 0) {
+ vcpu_printf(vcpu, "%s: not supervisor\n", __FUNCTION__);
+ inject_gp(vcpu);
+ return 1;
+ }
+#endif
+
+ exit_qualification = vmcs_read64(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->regs[reg]);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ case 3:
+ vcpu_load_rsp_rip(vcpu);
+ set_cr3(vcpu, vcpu->regs[reg]);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ case 4:
+ vcpu_load_rsp_rip(vcpu);
+ set_cr4(vcpu, vcpu->regs[reg]);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ case 8:
+ vcpu_load_rsp_rip(vcpu);
+ set_cr8(vcpu, vcpu->regs[reg]);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ };
+ break;
+ case 1: /*mov from cr*/
+ switch (cr) {
+ case 3:
+ vcpu_load_rsp_rip(vcpu);
+ vcpu->regs[reg] = vcpu->cr3;
+ vcpu_put_rsp_rip(vcpu);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ case 8:
+ printk(KERN_DEBUG "handle_cr: read CR8 "
+ "cpu erratum AA15\n");
+ vcpu_load_rsp_rip(vcpu);
+ vcpu->regs[reg] = vcpu->cr8;
+ 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;
+ printk(KERN_ERR "kvm: 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)
+{
+ u64 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_read64(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->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_run->exit_reason = KVM_EXIT_CPUID;
+ return 0;
+}
+
+static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ u32 ecx = vcpu->regs[VCPU_REGS_RCX];
+ u64 data;
+
+ if (vmx_get_msr(vcpu, ecx, &data)) {
+ inject_gp(vcpu);
+ return 1;
+ }
+
+ /* FIXME: handling of bits 32:63 of rax, rdx */
+ vcpu->regs[VCPU_REGS_RAX] = data & -1u;
+ vcpu->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->regs[VCPU_REGS_RCX];
+ u64 data = (vcpu->regs[VCPU_REGS_RAX] & -1u)
+ | ((u64)(vcpu->regs[VCPU_REGS_RDX] & -1u) << 32);
+
+ if (vmx_set_msr(vcpu, ecx, data) != 0) {
+ inject_gp(vcpu);
+ return 1;
+ }
+
+ skip_emulated_instruction(vcpu);
+ return 1;
+}
+
+static int handle_interrupt_window(struct kvm_vcpu *vcpu,
+ struct kvm_run *kvm_run)
+{
+ /* Turn off interrupt window reporting. */
+ vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
+ vmcs_read32(CPU_BASED_VM_EXEC_CONTROL)
+ & ~CPU_BASED_VIRTUAL_INTR_PENDING);
+ return 1;
+}
+
+static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ skip_emulated_instruction(vcpu);
+ if (vcpu->irq_summary && (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF))
+ return 1;
+
+ kvm_run->exit_reason = KVM_EXIT_HLT;
+ return 0;
+}
+
+/*
+ * 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_IO_INSTRUCTION] = handle_io,
+ [EXIT_REASON_INVLPG] = handle_invlpg,
+ [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,
+};
+
+static const int kvm_vmx_max_exit_handlers =
+ sizeof(kvm_vmx_exit_handlers) / sizeof(*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 vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
+ u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
+
+ 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);
+ kvm_run->instruction_length = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
+ 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 int vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
u8 fail;
@@ -753,6 +1157,7 @@ static struct kvm_arch_ops vmx_arch_ops
.decache_regs = vcpu_put_rsp_rip,

.run = vmx_vcpu_run,
+ .skip_emulated_instruction = skip_emulated_instruction,
.vmx_return = (unsigned long)kvm_vmx_return,
};

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  Last update: 2006-11-27 13:29    [from the cache]
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