Re: [Qemu-devel] virtio_cleanup() missing in virtio-{blk, balloon, 9p}-pci

[Markus Armbruster]

"M. Mohan Kumar" <address@hidden> writes:

>> Pattern:
>> 
>> FOO's PCIDeviceInfo method exit is virtio_FOO_exit_pci(), which calls
>> virtio_FOO_exit() and virtio_exit_pci().
>> 
>> virtio_{net,serial}_exit() call virtio_cleanup().
>> 
>> virtio_blk_exit() doesn't.  Why?
>> 
>> virtio-balloon-pci uses virtio_exit_pci() as exit method.  No
>> virtio_cleanup()?
>> 
>> virtio-9p-pci doesn't have an exit method.  Doesn't feel right.
>
> 9p does not support hot-plug now. We will implement virtio_9p_exit when we 
> are 
> adding support for hot-plug

If hot plug is not expected to work, perhaps the driver should refuse
it.  Untested sketch:

diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 729917d..b09d85d 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -683,6 +683,11 @@ static int virtio_9p_init_pci(PCIDevice *pci_dev)
     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
     VirtIODevice *vdev;
 
+    if (pci_dev->qdev.hotplugged) {
+        error_report("Device doesn't support hot plug");
+        return -1;
+    }
+
     vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf);
     virtio_init_pci(proxy, vdev,
                     PCI_VENDOR_ID_REDHAT_QUMRANET,