Similar to the previous patch, but concerning injection of exceptions rather
than external interrupts.
Signed-off-by: Nadav Har'El <nyh@xxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
--- .before/arch/x86/kvm/vmx.c 2011-05-25 22:41:09.000000000 +0300
+++ .after/arch/x86/kvm/vmx.c 2011-05-25 22:41:09.000000000 +0300
@@ -1585,6 +1585,25 @@ static void vmx_clear_hlt(struct kvm_vcp
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 k
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;
@@ -3819,6 +3842,9 @@ static void vmx_inject_nmi(struct kvm_vc
{
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
--
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