Re: [Xen-devel] [PATCH 3/3] libxl: add new pvusb backend "qusb" provided by qemu

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Mar 18, 2016 at 09:24:26AM +0100, Juergen Gross wrote:
> On 17/03/16 17:55, George Dunlap wrote:
> > On Thu, Mar 10, 2016 at 3:00 PM, Juergen Gross <jgross@xxxxxxxx> wrote:
> >> Add a new pvusb backend type "qusb" which is provided by qemu. It can
> >> be selected either by specifying the type directly in the configuration
> >> or it is selected automatically by libxl in case there is no "usbback"
> >> driver loaded.
> >>
> >> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> > 
> > Oh, last thing -- shouldn't we have a way for libxl to tell whether
> > qemu can provide a qusb backend before we offer to start it up?
> 
> How? Is this possible for qdisk? Or for an emulated frame buffer?
> 

I don't think it is  possible at the moment. But I think you might be
able to do it either via qmp command or parsing qemu help string. The
latter functionality is implemented in Ian's device model deprivilege
patch series IIRC -- but it is not yet merged either.

Wei.

> 
> Juergen
> 

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