virtio-pci: pass real with_irqfd to virtio_pci_set_guest_notifier()

Message ID
State New
Headers show

Commit Message

Stefan Hajnoczi March 27, 2013, 3:41 p.m.
virtio_pci_set_guest_notifiers() checks whether irqfd can be used and
whether MSI-X is enabled for the PCI adapter.  But then it calls
virtio_pci_set_guest_notifier() and passes kvm_msi_via_irqfd_enabled()
instead of with_irqfd.

When MSI-X is disabled but irqfd is allowed this means that
guest_notifier has neither irqfd nor a
virtio_queue_guest_notifier_read() handler.  Therefore the guest cannot
receive notifications.

This issue is triggered by a Windows 7 Professional 64-bit guest with
-device virtio-blk-pci,x-data-plane=on.  The guest driver does not
enable MSI-X and the guest gets stuck at the Windows boot screen since
it does not receive notifications.

Reported-by: 张磊强 (Leiqiang Zhang) <>
Signed-off-by: Stefan Hajnoczi <>
 hw/virtio-pci.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)


diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 736a9bf..84ece51 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -798,8 +798,7 @@  static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
-        r = virtio_pci_set_guest_notifier(d, n, assign,
-                                          kvm_msi_via_irqfd_enabled());
+        r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd);
         if (r < 0) {
             goto assign_error;