Re: [PATCH v3 3/4] vhost-user-vsock-pci: force virtio version 1

[Cornelia Huck <cohuck@redhat.com>]

On Fri, 18 Sep 2020 09:47:09 +0200
Stefano Garzarella <sgarzare@redhat.com> wrote:

> Commit 9b3a35ec82 ("virtio: verify that legacy support is not
> accidentally on") added a safety check that requires to set
> 'disable-legacy=on' on vhost-user-vsock-pci device:
> 
>     $ ./qemu-system-x86_64 ... \
>     -chardev socket,id=char0,reconnect=0,path=/tmp/vhost4.socket \
>     -device vhost-user-vsock-pci,chardev=char0
>         qemu-system-x86_64: -device vhost-user-vsock-pci,chardev=char0:
>         device is modern-only, use disable-legacy=on
> 
> virtio-vsock was introduced after the release of VIRTIO 1.0
> specifications, so it should be 'modern-only'.
> 
> This patch forces virtio version 1 and removes the 'transitional_name'
> property, as done for vhost-vsock-pci, removing the need to specify
> 'disable-legacy=on' on vhost-user-vsock-pci device.
> 
> Cc: qemu-stable@nongnu.org
> Suggested-by: Cornelia Huck <cohuck@redhat.com>
> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
> ---
> v2:
>  - fixed commit message [Cornelia]
> ---
>  hw/virtio/vhost-user-vsock-pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/virtio/vhost-user-vsock-pci.c b/hw/virtio/vhost-user-vsock-pci.c
> index 763f89984e..14109121e2 100644
> --- a/hw/virtio/vhost-user-vsock-pci.c
> +++ b/hw/virtio/vhost-user-vsock-pci.c
> @@ -41,6 +41,7 @@ static void vhost_user_vsock_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
>      VHostUserVSockPCI *dev = VHOST_USER_VSOCK_PCI(vpci_dev);
>      DeviceState *vdev = DEVICE(&dev->vdev);
>  
> +    virtio_pci_force_virtio_1(vpci_dev);

Maybe add a comment

/* unlike vhost-vsock, we do not need to care about pre-5.1 compat */


to help when we look at this in the future?

>      qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
>  }
>  
> @@ -69,7 +70,6 @@ static void vhost_user_vsock_pci_instance_init(Object *obj)
>  static const VirtioPCIDeviceTypeInfo vhost_user_vsock_pci_info = {
>      .base_name             = TYPE_VHOST_USER_VSOCK_PCI,
>      .generic_name          = "vhost-user-vsock-pci",
> -    .transitional_name     = "vhost-user-vsock-pci-transitional",
>      .non_transitional_name = "vhost-user-vsock-pci-non-transitional",
>      .instance_size = sizeof(VHostUserVSockPCI),
>      .instance_init = vhost_user_vsock_pci_instance_init,

Otherwise,
Reviewed-by: Cornelia Huck <cohuck@redhat.com>