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KVM: Fix faults during injection of real-mode interrupts 

If vmx fails to inject a real-mode interrupt while fetching the interrupt
redirection table, it fails to record this in the vectoring information
field.  So we detect this condition and do it ourselves.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-11-22 11:42:59 +02:00
parent 1155f76a81
commit 9c8cba3761
1 changed files with 49 additions and 2 deletions
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51
drivers/kvm/vmx.c
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@ -65,7 +65,13 @@ struct vcpu_vmx {
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)
@ -1713,11 +1719,16 @@ out:
static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (vcpu->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, vmcs_readl(GUEST_RIP) - 1);
vmcs_writel(GUEST_RIP, vmx->rmode.irq.rip - 1);
return;
}
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
@ -2251,6 +2262,17 @@ static void vmx_intr_assist(struct kvm_vcpu *vcpu)
return;
}
if (unlikely(idtv_info_field & INTR_INFO_VALID_MASK)) {
if ((idtv_info_field & VECTORING_INFO_TYPE_MASK)
== INTR_TYPE_EXT_INTR
&& vcpu->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));
@ -2275,6 +2297,29 @@ static void vmx_intr_assist(struct kvm_vcpu *vcpu)
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);
@ -2401,6 +2446,8 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
);
vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
if (vmx->rmode.irq.pending)
fixup_rmode_irq(vmx);
vcpu->interrupt_window_open =
(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0;