From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [PATCH 2/2] xen: add qemu device for each pvusb
 backend
Date: Tue, 27 Sep 2016 11:08:29 +0200
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To: Juergen Gross <jgross@suse.com>
Cc: anthony.perard@citrix.com, xen-devel@lists.xensource.com, sstabellini@kernel.org, qemu-devel@nongnu.org
List-Id: xen-devel@lists.xenproject.org

  Hi,

>  struct usbback_info {
>      struct XenDevice         xendev;  /* must be first */
> +    char                     id[24];
> +    struct USBBACKDevice     *dev;
>      USBBus                   bus;
>      void                     *urb_sring;
>      void                     *conn_sring;
> @@ -116,6 +124,10 @@ struct usbback_info {
>      QEMUBH                   *bh;
>  };
> =20
> +typedef struct USBBACKDevice {
> +    DeviceState qdev;
> +} USBBACKDevice;

Hmm, I think the xen core needs better QOM support ...

struct XenDevice should have a DeviceState element, so it can be used as
device object directly instead of attaching a device object like
this ...

cheers,
  Gerd