[v2 24/25] KVM: Suppress posted-interrupt when 'SN' is set

[Feng Wu]

Currently, we don't support urgent interrupt, all interrupts
are recognized as non-urgent interrupt, so we cannot send
posted-interrupt when 'SN' is set.

Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
---
 arch/x86/kvm/vmx.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index dc6fd84..6b2f3e7 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4306,15 +4306,22 @@ static int vmx_vm_has_apicv(struct kvm *kvm)
 static void vmx_deliver_posted_interrupt(struct kvm_vcpu *vcpu, int vector)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
-	int r;
+	int r, sn;
 
 	if (pi_test_and_set_pir(vector, &vmx->pi_desc))
 		return;
 
+	/*
+	 * Currently, we don't support urgent interrupt, all interrupts
+	 * are recognized as non-urgent interrupt, so we cannot send
+	 * posted-interrupt when 'SN' is set.
+	 */
+	sn = pi_test_sn(&vmx->pi_desc);
+
 	r = pi_test_and_set_on(&vmx->pi_desc);
 	kvm_make_request(KVM_REQ_EVENT, vcpu);
 #ifdef CONFIG_SMP
-	if (!r && (vcpu->mode == IN_GUEST_MODE))
+	if (!r && !sn && (vcpu->mode == IN_GUEST_MODE))
 		apic->send_IPI_mask(get_cpu_mask(vcpu->cpu),
 				POSTED_INTR_VECTOR);
 	else
-- 
1.7.1

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