6.12-stable review patch. If anyone has any objections, please let me know.
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From: Sean Christopherson seanjc@google.com
commit bcda70c56f3e718465cab2aad260cf34183ce1ce upstream.
Explicitly treat type differences as GSI routing changes, as comparing MSI data between two entries could get a false negative, e.g. if userspace changed the type but left the type-specific data as-is.
Fixes: 515a0c79e796 ("kvm: irqfd: avoid update unmodified entries of the routing") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson seanjc@google.com Message-ID: 20250404193923.1413163-4-seanjc@google.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kvm/x86.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -13601,7 +13601,8 @@ int kvm_arch_update_irqfd_routing(struct bool kvm_arch_irqfd_route_changed(struct kvm_kernel_irq_routing_entry *old, struct kvm_kernel_irq_routing_entry *new) { - if (new->type != KVM_IRQ_ROUTING_MSI) + if (old->type != KVM_IRQ_ROUTING_MSI || + new->type != KVM_IRQ_ROUTING_MSI) return true;
return !!memcmp(&old->msi, &new->msi, sizeof(new->msi));