[PATCH 39/67] KVM: x86: Track irq_bypass_vcpu in common x86 code

[Sean Christopherson <seanjc@xxxxxxxxxx>]

Track the vCPU that is being targeted for IRQ bypass, a.k.a. for a posted
IRQ, in common x86 code.  This will allow for additional consolidation of
the SVM and VMX code.

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
 arch/x86/kvm/svm/avic.c | 4 ----
 arch/x86/kvm/x86.c      | 7 ++++++-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 355673f95b70..bd1fcf2ea1e5 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -776,22 +776,18 @@ static void svm_ir_list_del(struct kvm_kernel_irqfd *irqfd)
 	spin_lock_irqsave(&to_svm(vcpu)->ir_list_lock, flags);
 	list_del(&irqfd->vcpu_list);
 	spin_unlock_irqrestore(&to_svm(vcpu)->ir_list_lock, flags);
-
-	irqfd->irq_bypass_vcpu = NULL;
 }
 
 static int svm_ir_list_add(struct vcpu_svm *svm,
 			   struct kvm_kernel_irqfd *irqfd,
 			   struct amd_iommu_pi_data *pi)
 {
-	struct kvm_vcpu *vcpu = &svm->vcpu;
 	unsigned long flags;
 	u64 entry;
 
 	if (WARN_ON_ONCE(!pi->ir_data))
 		return -EINVAL;
 
-	irqfd->irq_bypass_vcpu = vcpu;
 	irqfd->irq_bypass_data = pi->ir_data;
 
 	spin_lock_irqsave(&svm->ir_list_lock, flags);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 36d4a9ed144d..0d9bd8535f61 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -13604,8 +13604,13 @@ static int kvm_pi_update_irte(struct kvm_kernel_irqfd *irqfd,
 
 	r = kvm_x86_call(pi_update_irte)(irqfd, irqfd->kvm, host_irq, irqfd->gsi,
 					 new, vcpu, irq.vector);
-	if (r)
+	if (r) {
+		WARN_ON_ONCE(irqfd->irq_bypass_vcpu && !vcpu);
+		irqfd->irq_bypass_vcpu = NULL;
 		return r;
+	}
+
+	irqfd->irq_bypass_vcpu = vcpu;
 
 	trace_kvm_pi_irte_update(host_irq, vcpu, irqfd->gsi, irq.vector, !!vcpu);
 	return 0;
-- 
2.49.0.504.g3bcea36a83-goog