KVM: arm64: vgic-its: Test for valid IRQ in MOVALL handler

commit 85a71ee9a0700f6c18862ef3b0011ed9dad99aca upstream.

It is possible that an LPI mapped in a different ITS gets unmapped while
handling the MOVALL command. If that is the case, there is no state that
can be migrated to the destination. Silently ignore it and continue
migrating other LPIs.

Cc: stable@vger.kernel.org
Fixes: ff9c114394aa ("KVM: arm/arm64: GICv4: Handle MOVALL applied to a vPE")
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240221092732.4126848-3-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c
index 62f261b8eb62f69356e4e818b19f1238a3ec7bc5..8ae7096d4779545d061c1c4573cb8bb68a9b15b4 100644 (file)
--- a/arch/arm64/kvm/vgic/vgic-its.c
+++ b/arch/arm64/kvm/vgic/vgic-its.c
@@ -1374,6 +1374,8 @@ static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its,
 
        for (i = 0; i < irq_count; i++) {
                irq = vgic_get_irq(kvm, NULL, intids[i]);
+               if (!irq)
+                       continue;
 
                update_affinity(irq, vcpu2);