KVM: Clear assigned guest IRQ on release

When we deassign a guest IRQ, clear the potentially asserted guest line.
There might be no chance for the guest to do this, specifically if we
switch from INTx to MSI mode.

Acked-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
index 7c98928b09d9..ecc4419fadca 100644
--- a/virt/kvm/assigned-dev.c
+++ b/virt/kvm/assigned-dev.c
@@ -141,6 +141,9 @@ static void deassign_guest_irq(struct kvm *kvm,
         kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
         assigned_dev->ack_notifier.gsi = -1;
 
+        kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
+                    assigned_dev->guest_irq, 0);
+
         if (assigned_dev->irq_source_id != -1)
                 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
         assigned_dev->irq_source_id = -1;