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 c420723548d8d079741e12c5a1b035039e7f83e6..fe458e556d201aced333d473b9a9d0f707f65107 100644 (file)
--- a/arch/arm64/kvm/vgic/vgic-its.c
+++ b/arch/arm64/kvm/vgic/vgic-its.c
@@ -1427,6 +1427,8 @@ 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);