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KVM: x86: ignore APICv if LAPIC is not enabled

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commit 78311a514099932cd8434d5d2194aa94e56ab67c upstream.

Synchronize the two calls to kvm_x86_sync_pir_to_irr.  The one
in the reenter-guest fast path invoked the callback unconditionally
even if LAPIC is present but disabled.  In this case, there are
no interrupts to deliver, and therefore posted interrupts can
be ignored.

Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Bonzini 2021-11-17 07:35:44 -05:00 committed by Greg Kroah-Hartman
parent cbe4fcf371
commit 3a929e1d7e
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/x86.c
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@ -9723,7 +9723,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
if (likely(exit_fastpath != EXIT_FASTPATH_REENTER_GUEST))
break;
if (vcpu->arch.apicv_active)
if (kvm_lapic_enabled(vcpu) && vcpu->arch.apicv_active)
static_call(kvm_x86_sync_pir_to_irr)(vcpu);
if (unlikely(kvm_vcpu_exit_request(vcpu))) {