From: Maxim Levitsky mlevitsk@redhat.com
[ Upstream commit 66c768d30e64e1280520f34dbef83419f55f3459 ]
Currently nothing prevents preemption in kvm_vcpu_update_apicv.
On SVM, If the preemption happens after we update the vcpu->arch.apicv_active, the preemption itself will 'update' the inhibition since the AVIC will be first disabled on vCPU unload and then enabled, when the current task is loaded again.
Then we will try to update it again, which will lead to a warning in __avic_vcpu_load, that the AVIC is already enabled.
Fix this by disabling preemption in this code.
Signed-off-by: Maxim Levitsky mlevitsk@redhat.com Message-Id: 20220606180829.102503-6-mlevitsk@redhat.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/kvm/x86.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 91d887fd10ab..65b0ec28bd52 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9784,6 +9784,7 @@ void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu) return;
down_read(&vcpu->kvm->arch.apicv_update_lock); + preempt_disable();
activate = kvm_apicv_activated(vcpu->kvm); if (vcpu->arch.apicv_active == activate) @@ -9803,6 +9804,7 @@ void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu) kvm_make_request(KVM_REQ_EVENT, vcpu);
out: + preempt_enable(); up_read(&vcpu->kvm->arch.apicv_update_lock); } EXPORT_SYMBOL_GPL(kvm_vcpu_update_apicv);