[PATCH v3 45/62] KVM: SVM: Don't check for assigned device(s) when activating AVIC

Sean Christopherson
2025-06-11T22:48:13Z

Don't short-circuit IRTE updating when (de)activating AVIC based on the
VM having assigned devices, as nothing prevents AVIC (de)activation from
racing with device (de)assignment. And from a performance perspective,
bailing early when there is no assigned device doesn't add much, as
ir_list_lock will never be contended if there's no assigned device.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/svm/avic.c | 3 ---
1 file changed, 3 deletions(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index dadd982b03c0..ab7fb8950cc0 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -732,9 +732,6 @@ static int avic_set_pi_irte_mode(struct kvm_vcpu *vcpu, bool activate)
struct vcpu_svm *svm = to_svm(vcpu);
struct kvm_kernel_irqfd *irqfd;

- if (!kvm_arch_has_assigned_device(vcpu->kvm))
- return 0;
-
/*
* Here, we go through the per-vcpu ir_list to update all existing
* interrupt remapping table entry targeting this vcpu.
--
2.50.0.rc1.591.g9c95f17f64-goog