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KVM: x86: Don't update IRTE entries when old and new routes were !MSI

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Skip the entirety of IRTE updates on a GSI routing change if neither the
old nor the new routing is for an MSI, i.e. if the neither routing setup
allows for posting to a vCPU.  If the IRTE isn't already host controlled,
KVM has bigger problems.

Link: https://lore.kernel.org/r/20250611224604.313496-38-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-06-11 15:45:39 -07:00
parent dc6adb1304
commit cc8b13105e
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/irq.c
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@ -618,6 +618,10 @@ void kvm_arch_update_irqfd_routing(struct kvm_kernel_irqfd *irqfd,
struct kvm_kernel_irq_routing_entry *old,
struct kvm_kernel_irq_routing_entry *new)
{
if (new->type != KVM_IRQ_ROUTING_MSI &&
old->type != KVM_IRQ_ROUTING_MSI)
return;
if (old->type == KVM_IRQ_ROUTING_MSI &&
new->type == KVM_IRQ_ROUTING_MSI &&
!memcmp(&old->msi, &new->msi, sizeof(new->msi)))