diff options
| author | Sean Christopherson <seanjc@google.com> | 2025-06-11 15:45:39 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-06-23 09:50:35 -0700 |
| commit | cc8b13105eac969bb721c52cf95fd35818b5c54c (patch) | |
| tree | 00929d6a81604c43c21db831dff0a52e5973d8bc | |
| parent | dc6adb13046abe199194f788e5d0dc41c67db5bc (diff) | |
KVM: x86: Don't update IRTE entries when old and new routes were !MSI
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>
| -rw-r--r-- | arch/x86/kvm/irq.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c index ecebd150c2f7..bc9ebd893566 100644 --- a/arch/x86/kvm/irq.c +++ b/arch/x86/kvm/irq.c @@ -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))) |