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KVM: arm64: vgic-v4: Only WARN for HW IRQ mismatch when unmapping vLPI

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The VMM or guest can easily screw up GICv4 vLPI injection by
misconfiguring the MSI or the virtual ITS. Don't fuss over it; limit the
WARN in vgic_v4_unset_forwarding() to fire in the worrying case where an
unrelated HW IRQ was mapped to a vLPI.

Reported-by: Sudheer Dantuluri <dantuluris@google.com>
Tested-by: Sudheer Dantuluri <dantuluris@google.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250226183124.82094-3-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2025-02-26 10:31:22 -08:00
parent a0d7e2fc61
commit d0b79563fd
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kvm/vgic/vgic-v4.c
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@ -512,7 +512,7 @@ int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int virq,
if (ret)
goto out;
WARN_ON(!(irq->hw && irq->host_irq == virq));
WARN_ON(irq->hw && irq->host_irq != virq);
if (irq->hw) {
atomic_dec(&irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count);
irq->hw = false;