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KVM: x86: Skip IOMMU IRTE updates if there's no old or new vCPU being targeted

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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.

Link: https://lore.kernel.org/r/20250611224604.313496-37-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-06-11 15:45:38 -07:00
parent 511754bc54
commit dc6adb1304
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/irq.c
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@ -542,6 +542,9 @@ 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,
vcpu, irq.vector);
if (r) {