@@ -8979,6 +8979,15 @@ void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu)
vcpu->arch.apicv_active = kvm_apicv_activated(vcpu->kvm);
kvm_apic_update_apicv(vcpu);
static_call(kvm_x86_refresh_apicv_exec_ctrl)(vcpu);
+
+ /*
+ * When APICv gets disabled, we may still have injected interrupts
+ * pending. At the same time, KVM_REQ_EVENT may not be set as APICv was
+ * still active when the interrupt got accepted. Make sure
+ * inject_pending_event() is called to check for that.
+ */
+ if (!vcpu->arch.apicv_active)
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
}
EXPORT_SYMBOL_GPL(kvm_vcpu_update_apicv);
When APICv is active, interrupt injection doesn't raise KVM_REQ_EVENT request (see __apic_accept_irq()) as the required work is done by hardware. In case KVM_REQ_APICV_UPDATE collides with such injection, the interrupt may never get delivered. Currently, the described situation is hardly possible: all kvm_request_apicv_update() calls normally happen upon VM creation when no interrupts are pending. We are, however, going to move unconditional kvm_request_apicv_update() call from kvm_hv_activate_synic() to synic_update_vector() and without this fix 'hyperv_connections' test from kvm-unit-tests gets stuck on IPI delivery attempt right after configuring a SynIC route which triggers APICv disablement. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> --- arch/x86/kvm/x86.c | 9 +++++++++ 1 file changed, 9 insertions(+)