From patchwork Mon Feb 22 13:59:07 2010
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Subject: [uq/master,
 1/2] virtio-pci: wake up iothread on VIRTIO_PCI_QUEUE_NOTIFY
Date: Mon, 22 Feb 2010 03:59:07 -0000
From: Marcelo Tosatti <mtosatti@redhat.com>
X-Patchwork-Id: 45962
Message-Id: <20100222140209.878250600@amt.cnet>
To: kvm@vger.kernel.org, qemu-devel@nongnu.org
Cc: Marcelo Tosatti <mtosatti@redhat.com>, avi@redhat.com

VIRTIO_PCI_QUEUE_NOTIFY is used to inform availability of new buffers,
so wakeup the iothread to process that information immediately.

Reported-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>


Index: qemu/hw/virtio-pci.c
===================================================================
--- qemu.orig/hw/virtio-pci.c
+++ qemu/hw/virtio-pci.c
@@ -204,6 +204,7 @@ static void virtio_ioport_write(void *op
         break;
     case VIRTIO_PCI_QUEUE_NOTIFY:
         virtio_queue_notify(vdev, val);
+        qemu_notify_event();
         break;
     case VIRTIO_PCI_STATUS:
         vdev->status = val & 0xFF;