This is a note to let you know that I've just added the patch titled
kvm: vmx: check apicv is active before using VT-d posted interrupt
to the 4.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-vmx-check-apicv-is-active-before-using-vt-d-posted-interrupt.patch
and it can be found in the queue-4.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a0052191624e9bf8a8f9dc41b92ab5f252566c3c Mon Sep 17 00:00:00 2001
From: Yang Zhang <yang.zhang.wz@xxxxxxxxx>
Date: Mon, 13 Jun 2016 09:56:56 +0800
Subject: kvm: vmx: check apicv is active before using VT-d posted interrupt
From: Yang Zhang <yang.zhang.wz@xxxxxxxxx>
commit a0052191624e9bf8a8f9dc41b92ab5f252566c3c upstream.
VT-d posted interrupt is relying on the CPU side's posted interrupt.
Need to check whether VCPU's APICv is active before enabing VT-d
posted interrupt.
Fixes: d62caabb41f33d96333f9ef15e09cd26e1c12760
Signed-off-by: Yang Zhang <yang.zhang.wz@xxxxxxxxx>
Signed-off-by: Shengge Ding <shengge.dsg@xxxxxxxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2072,7 +2072,8 @@ static void vmx_vcpu_pi_load(struct kvm_
unsigned int dest;
if (!kvm_arch_has_assigned_device(vcpu->kvm) ||
- !irq_remapping_cap(IRQ_POSTING_CAP))
+ !irq_remapping_cap(IRQ_POSTING_CAP) ||
+ !kvm_vcpu_apicv_active(vcpu))
return;
do {
@@ -2180,7 +2181,8 @@ static void vmx_vcpu_pi_put(struct kvm_v
struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
if (!kvm_arch_has_assigned_device(vcpu->kvm) ||
- !irq_remapping_cap(IRQ_POSTING_CAP))
+ !irq_remapping_cap(IRQ_POSTING_CAP) ||
+ !kvm_vcpu_apicv_active(vcpu))
return;
/* Set SN when the vCPU is preempted */
@@ -10702,7 +10704,8 @@ static int vmx_pre_block(struct kvm_vcpu
struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
if (!kvm_arch_has_assigned_device(vcpu->kvm) ||
- !irq_remapping_cap(IRQ_POSTING_CAP))
+ !irq_remapping_cap(IRQ_POSTING_CAP) ||
+ !kvm_vcpu_apicv_active(vcpu))
return 0;
vcpu->pre_pcpu = vcpu->cpu;
@@ -10768,7 +10771,8 @@ static void vmx_post_block(struct kvm_vc
unsigned long flags;
if (!kvm_arch_has_assigned_device(vcpu->kvm) ||
- !irq_remapping_cap(IRQ_POSTING_CAP))
+ !irq_remapping_cap(IRQ_POSTING_CAP) ||
+ !kvm_vcpu_apicv_active(vcpu))
return;
do {
@@ -10821,7 +10825,8 @@ static int vmx_update_pi_irte(struct kvm
int idx, ret = -EINVAL;
if (!kvm_arch_has_assigned_device(kvm) ||
- !irq_remapping_cap(IRQ_POSTING_CAP))
+ !irq_remapping_cap(IRQ_POSTING_CAP) ||
+ !kvm_vcpu_apicv_active(kvm->vcpus[0]))
return 0;
idx = srcu_read_lock(&kvm->irq_srcu);
Patches currently in stable-queue which might be from yang.zhang.wz@xxxxxxxxx are
queue-4.6/kvm-vmx-check-apicv-is-active-before-using-vt-d-posted-interrupt.patch
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