Re: [Qemu-devel] [PATCH for-1.5] virtio: add virtio_bus_get_dev_path.'

[mdroth <mdroth@linux.vnet.ibm.com>]

On Thu, May 16, 2013 at 07:06:07PM +0200, fred.konrad@greensocs.com wrote:
> From: KONRAD Frederic <fred.konrad@greensocs.com>
> 
> This adds virtio_bus_get_dev_path to fix migration id string which is wrong
> since the virtio refactoring.
> 
> Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> Cc: mdroth <mdroth@linux.vnet.ibm.com>

Re-tested the failure scenario with this patch applied and this does
seem to resolve the issue. For reference, the configuration was v1.4.0
<-> 1.5.0-rc2+fix using the following options:

x86_64-softmmu/qemu-system-x86_64 -enable-kvm -L temp-bios -M
pc-i440fx-1.4 -m 512M -kernel boot/vmlinuz-x86_64 -initrd
boot/test-initramfs-x86_64.img.gz -vga std -append seed=1234 -drive
file=disk1.img,if=virtio -drive file=disk2.img,if=virtio -device
virtio-net-pci,netdev=net0 -netdev user,id=net0

Tested-by: Michael Roth <mdroth@linux.vnet.ibm.com>

> ---
>  hw/virtio/virtio-bus.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c
> index aab72ff..ea2e11a 100644
> --- a/hw/virtio/virtio-bus.c
> +++ b/hw/virtio/virtio-bus.c
> @@ -154,12 +154,26 @@ void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config)
>      }
>  }
> 
> +static char *virtio_bus_get_dev_path(DeviceState *dev)
> +{
> +    BusState *bus = qdev_get_parent_bus(dev);
> +    DeviceState *proxy = DEVICE(bus->parent);
> +    return qdev_get_dev_path(proxy);
> +}
> +
> +static void virtio_bus_class_init(ObjectClass *klass, void *data)
> +{
> +    BusClass *bus_class = BUS_CLASS(klass);
> +    bus_class->get_dev_path = virtio_bus_get_dev_path;
> +}
> +
>  static const TypeInfo virtio_bus_info = {
>      .name = TYPE_VIRTIO_BUS,
>      .parent = TYPE_BUS,
>      .instance_size = sizeof(VirtioBusState),
>      .abstract = true,
>      .class_size = sizeof(VirtioBusClass),
> +    .class_init = virtio_bus_class_init
>  };
> 
>  static void virtio_register_types(void)
> -- 
> 1.7.11.7
>