[v2,08/10] KVM: nVMX: Cast exit_reason to u16 to check for nested EXTERNAL_INTERRUPT
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Message ID 20200415175519.14230-9-sean.j.christopherson@intel.com
State New
Headers show
  • KVM: VMX: Unionize vcpu_vmx.exit_reason
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Commit Message

Sean Christopherson April 15, 2020, 5:55 p.m. UTC
Explicitly check only the basic exit reason when emulating an external
interrupt VM-Exit in nested_vmx_vmexit().  Checking the full exit reason
doesn't currently cause problems, but only because the only exit reason
modifier support by KVM is FAILED_VMENTRY, which is mutually exclusive
with EXTERNAL_INTERRUPT.  Future modifiers, e.g. ENCLAVE_MODE, will

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
 arch/x86/kvm/vmx/nested.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 67d27bc40143..23d84d063197 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4406,7 +4406,7 @@  void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
 	vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
 	if (likely(!vmx->fail)) {
-		if (exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT &&
+		if ((u16)exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT &&
 		    nested_exit_intr_ack_set(vcpu)) {
 			int irq = kvm_cpu_get_interrupt(vcpu);
 			WARN_ON(irq < 0);