[PATCH v3 49/62] KVM: x86: Drop superfluous "has assigned device" check in kvm_pi_update_irte()

Sean Christopherson
2025-06-11T22:48:21Z

Don't bother checking if the VM has an assigned device when updating
IRTE entries. kvm_arch_irq_bypass_add_producer() explicitly increments
the assigned device count, kvm_arch_irq_bypass_del_producer() explicitly
decrements the count before invoking kvm_pi_update_irte(), and
kvm_irq_routing_update() only updates IRTE entries if there's an active
IRQ bypass producer.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/irq.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index 4119c1e880e7..45cb9f1ee618 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -517,9 +517,7 @@ static int kvm_pi_update_irte(struct kvm_kernel_irqfd *irqfd,
struct kvm_lapic_irq irq;
int r;

- if (!irqchip_in_kernel(kvm) ||
- !kvm_arch_has_irq_bypass() ||
- !kvm_arch_has_assigned_device(kvm))
+ if (!irqchip_in_kernel(kvm) || !kvm_arch_has_irq_bypass())
return 0;

if (entry && entry->type == KVM_IRQ_ROUTING_MSI) {
--
2.50.0.rc1.591.g9c95f17f64-goog