[PATCH 40/45] KVM: Do not re-execute INTn instruction.
From: Avi Kivity
Date: Sun May 24 2009 - 11:53:26 EST
From: Gleb Natapov <gleb@xxxxxxxxxx>
Re-inject event instead. This is what Intel suggest. Also use correct
instruction length when re-injecting soft fault/interrupt.
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 5 ++++-
arch/x86/kvm/svm.c | 8 ++++----
arch/x86/kvm/vmx.c | 32 +++++++++++++++++++++++++-------
arch/x86/kvm/x86.c | 11 ++++++-----
arch/x86/kvm/x86.h | 9 ++++++++-
5 files changed, 47 insertions(+), 18 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 977a785..1d6c3f7 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -319,6 +319,8 @@ struct kvm_vcpu_arch {
struct kvm_pio_request pio;
void *pio_data;
+ u8 event_exit_inst_len;
+
struct kvm_queued_exception {
bool pending;
bool has_error_code;
@@ -328,6 +330,7 @@ struct kvm_vcpu_arch {
struct kvm_queued_interrupt {
bool pending;
+ bool soft;
u8 nr;
} interrupt;
@@ -510,7 +513,7 @@ struct kvm_x86_ops {
u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
void (*patch_hypercall)(struct kvm_vcpu *vcpu,
unsigned char *hypercall_addr);
- void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
+ void (*set_irq)(struct kvm_vcpu *vcpu);
void (*set_nmi)(struct kvm_vcpu *vcpu);
void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
bool has_error_code, u32 error_code);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 1315ce0..377c4f1 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2310,13 +2310,13 @@ static void svm_queue_irq(struct kvm_vcpu *vcpu, unsigned nr)
SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR;
}
-static void svm_set_irq(struct kvm_vcpu *vcpu, int irq)
+static void svm_set_irq(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
nested_svm_intr(svm);
- svm_queue_irq(vcpu, irq);
+ svm_queue_irq(vcpu, vcpu->arch.interrupt.nr);
}
static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
@@ -2418,7 +2418,7 @@ static void svm_complete_interrupts(struct vcpu_svm *svm)
case SVM_EXITINTINFO_TYPE_EXEPT:
/* In case of software exception do not reinject an exception
vector, but re-execute and instruction instead */
- if (vector == BP_VECTOR || vector == OF_VECTOR)
+ if (kvm_exception_is_soft(vector))
break;
if (exitintinfo & SVM_EXITINTINFO_VALID_ERR) {
u32 err = svm->vmcb->control.exit_int_info_err;
@@ -2428,7 +2428,7 @@ static void svm_complete_interrupts(struct vcpu_svm *svm)
kvm_queue_exception(&svm->vcpu, vector);
break;
case SVM_EXITINTINFO_TYPE_INTR:
- kvm_queue_interrupt(&svm->vcpu, vector);
+ kvm_queue_interrupt(&svm->vcpu, vector, false);
break;
default:
break;
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 8981654..29b49f0 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -801,8 +801,9 @@ static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
return;
}
- if (nr == BP_VECTOR || nr == OF_VECTOR) {
- vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
+ if (kvm_exception_is_soft(nr)) {
+ vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
+ vmx->vcpu.arch.event_exit_inst_len);
intr_info |= INTR_TYPE_SOFT_EXCEPTION;
} else
intr_info |= INTR_TYPE_HARD_EXCEPTION;
@@ -2445,9 +2446,11 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu)
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
}
-static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
+static void vmx_inject_irq(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
+ uint32_t intr;
+ int irq = vcpu->arch.interrupt.nr;
KVMTRACE_1D(INJ_VIRQ, vcpu, (u32)irq, handler);
@@ -2462,8 +2465,14 @@ static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
return;
}
- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
- irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
+ intr = irq | INTR_INFO_VALID_MASK;
+ if (vcpu->arch.interrupt.soft) {
+ intr |= INTR_TYPE_SOFT_INTR;
+ vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
+ vmx->vcpu.arch.event_exit_inst_len);
+ } else
+ intr |= INTR_TYPE_EXT_INTR;
+ vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr);
}
static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
@@ -3024,6 +3033,7 @@ static int handle_task_switch(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
GUEST_INTR_STATE_NMI);
break;
case INTR_TYPE_EXT_INTR:
+ case INTR_TYPE_SOFT_INTR:
kvm_clear_interrupt_queue(vcpu);
break;
case INTR_TYPE_HARD_EXCEPTION:
@@ -3295,16 +3305,24 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
GUEST_INTR_STATE_NMI);
break;
- case INTR_TYPE_HARD_EXCEPTION:
case INTR_TYPE_SOFT_EXCEPTION:
+ vmx->vcpu.arch.event_exit_inst_len =
+ vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
+ /* fall through */
+ case INTR_TYPE_HARD_EXCEPTION:
if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
u32 err = vmcs_read32(IDT_VECTORING_ERROR_CODE);
kvm_queue_exception_e(&vmx->vcpu, vector, err);
} else
kvm_queue_exception(&vmx->vcpu, vector);
break;
+ case INTR_TYPE_SOFT_INTR:
+ vmx->vcpu.arch.event_exit_inst_len =
+ vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
+ /* fall through */
case INTR_TYPE_EXT_INTR:
- kvm_queue_interrupt(&vmx->vcpu, vector);
+ kvm_queue_interrupt(&vmx->vcpu, vector,
+ type == INTR_TYPE_SOFT_INTR);
break;
default:
break;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c176b1f..e395ca4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1437,7 +1437,7 @@ static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
return -ENXIO;
vcpu_load(vcpu);
- kvm_queue_interrupt(vcpu, irq->irq);
+ kvm_queue_interrupt(vcpu, irq->irq, false);
vcpu_put(vcpu);
@@ -3157,7 +3157,7 @@ static void inject_irq(struct kvm_vcpu *vcpu)
}
if (vcpu->arch.interrupt.pending) {
- kvm_x86_ops->set_irq(vcpu, vcpu->arch.interrupt.nr);
+ kvm_x86_ops->set_irq(vcpu);
return;
}
@@ -3170,8 +3170,9 @@ static void inject_irq(struct kvm_vcpu *vcpu)
}
} else if (kvm_cpu_has_interrupt(vcpu)) {
if (kvm_x86_ops->interrupt_allowed(vcpu)) {
- kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu));
- kvm_x86_ops->set_irq(vcpu, vcpu->arch.interrupt.nr);
+ kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
+ false);
+ kvm_x86_ops->set_irq(vcpu);
}
}
}
@@ -4094,7 +4095,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
pending_vec = find_first_bit(
(const unsigned long *)sregs->interrupt_bitmap, max_bits);
if (pending_vec < max_bits) {
- kvm_queue_interrupt(vcpu, pending_vec);
+ kvm_queue_interrupt(vcpu, pending_vec, false);
pr_debug("Set back pending irq %d\n", pending_vec);
if (irqchip_in_kernel(vcpu->kvm))
kvm_pic_clear_isr_ack(vcpu->kvm);
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index c1f1a8c..4c8e10a 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -8,9 +8,11 @@ static inline void kvm_clear_exception_queue(struct kvm_vcpu *vcpu)
vcpu->arch.exception.pending = false;
}
-static inline void kvm_queue_interrupt(struct kvm_vcpu *vcpu, u8 vector)
+static inline void kvm_queue_interrupt(struct kvm_vcpu *vcpu, u8 vector,
+ bool soft)
{
vcpu->arch.interrupt.pending = true;
+ vcpu->arch.interrupt.soft = soft;
vcpu->arch.interrupt.nr = vector;
}
@@ -24,4 +26,9 @@ static inline bool kvm_event_needs_reinjection(struct kvm_vcpu *vcpu)
return vcpu->arch.exception.pending || vcpu->arch.interrupt.pending ||
vcpu->arch.nmi_injected;
}
+
+static inline bool kvm_exception_is_soft(unsigned int nr)
+{
+ return (nr == BP_VECTOR) || (nr == OF_VECTOR);
+}
#endif
--
1.6.0.6
--
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