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kvm: svm/avic: Do not send AVIC doorbell to self 

AVIC doorbell is used to notify a running vCPU that interrupts
has been injected into the vCPU AVIC backing page. Current logic
checks only if a VCPU is running before sending a doorbell.
However, the doorbell is not necessary if the destination
CPU is itself.

Add logic to check currently running CPU before sending doorbell.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: Alexander Graf <graf@amazon.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Suthikulpanit, Suravee 2019-05-03 06:38:53 -07:00 committed by Paolo Bonzini
parent b6c4bc659c
commit 0532dd52df
1 changed files with 7 additions and 4 deletions
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11
arch/x86/kvm/svm.c
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@ -5163,10 +5163,13 @@ static void svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
kvm_lapic_set_irr(vec, vcpu->arch.apic);
smp_mb__after_atomic();
if (avic_vcpu_is_running(vcpu))
wrmsrl(SVM_AVIC_DOORBELL,
kvm_cpu_get_apicid(vcpu->cpu));
else
if (avic_vcpu_is_running(vcpu)) {
int cpuid = vcpu->cpu;
if (cpuid != get_cpu())
wrmsrl(SVM_AVIC_DOORBELL, kvm_cpu_get_apicid(cpuid));
put_cpu();
} else
kvm_vcpu_wake_up(vcpu);
}