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KVM: SVM: avoid refreshing avic if its state didn't change 

Since AVIC can be inhibited and uninhibited rapidly it is possible that
we have nothing to do by the time the svm_refresh_apicv_exec_ctrl
is called.

Detect and avoid this, which will be useful when we will start calling
avic_vcpu_load/avic_vcpu_put when the avic inhibition state changes.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210810205251.424103-14-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky 2021-08-10 23:52:48 +03:00 committed by Paolo Bonzini
parent 30eed56a7e
commit 06ef813466
1 changed files with 8 additions and 1 deletions
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9
arch/x86/kvm/x86.c
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@ -9239,12 +9239,18 @@ void kvm_make_scan_ioapic_request(struct kvm *kvm)
void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu)
{
bool activate;
if (!lapic_in_kernel(vcpu))
return;
mutex_lock(&vcpu->kvm->arch.apicv_update_lock);
vcpu->arch.apicv_active = kvm_apicv_activated(vcpu->kvm);
activate = kvm_apicv_activated(vcpu->kvm);
if (vcpu->arch.apicv_active == activate)
goto out;
vcpu->arch.apicv_active = activate;
kvm_apic_update_apicv(vcpu);
static_call(kvm_x86_refresh_apicv_exec_ctrl)(vcpu);
@ -9257,6 +9263,7 @@ void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu)
if (!vcpu->arch.apicv_active)
kvm_make_request(KVM_REQ_EVENT, vcpu);
out:
mutex_unlock(&vcpu->kvm->arch.apicv_update_lock);
}
EXPORT_SYMBOL_GPL(kvm_vcpu_update_apicv);