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KVM: nVMX: Correct handling of exception injection 

Similar to the previous patch, but concerning injection of exceptions rather
than external interrupts.

Signed-off-by: Nadav Har'El <nyh@il.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Nadav Har'El 2011-05-25 23:13:36 +03:00 committed by Avi Kivity
parent b6f1250edb
commit 0b6ac343fc
1 changed files with 26 additions and 0 deletions
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26
arch/x86/kvm/vmx.c
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@ -1585,6 +1585,25 @@ static void vmx_clear_hlt(struct kvm_vcpu *vcpu)
vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE);
}
/*
* KVM wants to inject page-faults which it got to the guest. This function
* checks whether in a nested guest, we need to inject them to L1 or L2.
* This function assumes it is called with the exit reason in vmcs02 being
* a #PF exception (this is the only case in which KVM injects a #PF when L2
* is running).
*/
static int nested_pf_handled(struct kvm_vcpu *vcpu)
{
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
/* TODO: also check PFEC_MATCH/MASK, not just EB.PF. */
if (!(vmcs12->exception_bitmap & PF_VECTOR))
return 0;
nested_vmx_vmexit(vcpu);
return 1;
}
static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
bool has_error_code, u32 error_code,
bool reinject)
@ -1592,6 +1611,10 @@ static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 intr_info = nr | INTR_INFO_VALID_MASK;
if (nr == PF_VECTOR && is_guest_mode(vcpu) &&
nested_pf_handled(vcpu))
return;
if (has_error_code) {
vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
intr_info |= INTR_INFO_DELIVER_CODE_MASK;
@ -3820,6 +3843,9 @@ static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (is_guest_mode(vcpu))
return;
if (!cpu_has_virtual_nmis()) {
/*
* Tracking the NMI-blocked state in software is built upon