diff mbox series

[40/67] KVM: x86: Skip IOMMU IRTE updates if there's no old or new vCPU being targeted

Message ID 20250404193923.1413163-41-seanjc@google.com (mailing list archive)
State New
Headers show
Series KVM: iommu: Overhaul device posted IRQs support | expand

Commit Message

Sean Christopherson April 4, 2025, 7:38 p.m. UTC 
Don't "reconfigure" an IRTE into host controlled mode when it's already in
the state, i.e. if KVM's GSI routing changes but the IRQ wasn't and still
isn't being posted to a vCPU.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/x86.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0d9bd8535f61..8325a908fa25 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -13602,6 +13602,9 @@  static int kvm_pi_update_irte(struct kvm_kernel_irqfd *irqfd,
 			vcpu = NULL;
 	}
 
+	if (!irqfd->irq_bypass_vcpu && !vcpu)
+		return 0;
+
 	r = kvm_x86_call(pi_update_irte)(irqfd, irqfd->kvm, host_irq, irqfd->gsi,
 					 new, vcpu, irq.vector);
 	if (r) {