[08/13] KVM: nVMX: Preserve IRQ/NMI priority irrespective of exiting behavior
diff mbox series

Message ID 20200423022550.15113-9-sean.j.christopherson@intel.com
State New
Headers show
Series
  • KVM: x86: Event fixes and cleanup
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Commit Message

Sean Christopherson April 23, 2020, 2:25 a.m. UTC
Short circuit vmx_check_nested_events() if an unblocked IRQ/NMI is
pending and needs to be injected into L2, priority between coincident
events is not dependent on exiting behavior.

Fixes: b6b8a1451fc4 ("KVM: nVMX: Rework interception of IRQs and NMIs")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/vmx/nested.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Comments

Jim Mattson April 28, 2020, 9:58 p.m. UTC | #1
On Wed, Apr 22, 2020 at 7:26 PM Sean Christopherson
<sean.j.christopherson@intel.com> wrote:
>
> Short circuit vmx_check_nested_events() if an unblocked IRQ/NMI is
> pending and needs to be injected into L2, priority between coincident
> events is not dependent on exiting behavior.
>
> Fixes: b6b8a1451fc4 ("KVM: nVMX: Rework interception of IRQs and NMIs")
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Jim Mattson <jmattson@google.com>

Patch
diff mbox series

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 40b2427f35b7..1fdaca5fd93d 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -3750,9 +3750,12 @@  static int vmx_check_nested_events(struct kvm_vcpu *vcpu)
 		return 0;
 	}
 
-	if (vcpu->arch.nmi_pending && nested_exit_on_nmi(vcpu)) {
+	if (vcpu->arch.nmi_pending && !vmx_nmi_blocked(vcpu)) {
 		if (block_nested_events)
 			return -EBUSY;
+		if (!nested_exit_on_nmi(vcpu))
+			goto no_vmexit;
+
 		nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
 				  NMI_VECTOR | INTR_TYPE_NMI_INTR |
 				  INTR_INFO_VALID_MASK, 0);
@@ -3765,9 +3768,11 @@  static int vmx_check_nested_events(struct kvm_vcpu *vcpu)
 		return 0;
 	}
 
-	if (kvm_cpu_has_interrupt(vcpu) && nested_exit_on_intr(vcpu)) {
+	if (kvm_cpu_has_interrupt(vcpu) && !vmx_interrupt_blocked(vcpu)) {
 		if (block_nested_events)
 			return -EBUSY;
+		if (!nested_exit_on_intr(vcpu))
+			goto no_vmexit;
 		nested_vmx_vmexit(vcpu, EXIT_REASON_EXTERNAL_INTERRUPT, 0, 0);
 		return 0;
 	}