[PATCH 4.6 077/203] kvm: vmx: check apicv is active before using VT-d posted interrupt
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2016-07-25 22:14:58
Also in:
lkml
4.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yang Zhang <redacted> 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 <redacted> Signed-off-by: Shengge Ding <redacted> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- 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);