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KVM: arm64: Explicitly treat routing entry type changes as changes

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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-

Note, the same bug was fixed in x86 by commit bcda70c56f ("KVM: x86:
Explicitly treat routing entry type changes as changes").

Fixes: 4bf3693d36 ("KVM: arm64: Unmap vLPIs affected by changes to GSI routing information")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20250611224604.313496-3-seanjc@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Sean Christopherson 2025-06-11 15:45:04 -07:00 committed by Marc Zyngier
parent 8a8ff069c7
commit 1fbe6861a6
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/kvm/arm.c
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@ -2764,7 +2764,8 @@ void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
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));