linux-kernel - [PATCH 11/13] KVM: Suppress posted-interrupt when 'SN' is set

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Message-Id: <1415600812-27773-12-git-send-email-feng.wu@intel.com>
Date:	Mon, 10 Nov 2014 14:26:50 +0800
From:	Feng Wu <feng.wu@...el.com>
To:	gleb@...nel.org, pbonzini@...hat.com, dwmw2@...radead.org,
	joro@...tes.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org
Cc:	kvm@...r.kernel.org, iommu@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Feng Wu <feng.wu@...el.com>
Subject: [PATCH 11/13] KVM: Suppress posted-interrupt when 'SN' is set

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@...el.com>
---
 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 51d2c8a..495cfbd 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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