linux-kernel - Re: [PATCH] allow xenfb initialization for hvm guests

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Date:	Fri, 3 Jan 2014 18:38:28 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>,
	<xen-devel@...ts.xensource.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] allow xenfb initialization for hvm guests

On Tue, 31 Dec 2013, Konrad Rzeszutek Wilk wrote:
> On Tue, Dec 17, 2013 at 05:53:13PM +0000, Stefano Stabellini wrote:
> > There is no reasons why an HVM guest shouldn't be allowed to use xenfb.
> > As a matter of fact ARM guests, HVM from Linux POV, can use xenfb.
> > Given that no Xen toolstacks configure a xenfb backend for x86 HVM
> > guests, they are not affected.
> 
> Could you reference the upstream git commit that enables this.

The toolstack can already setup a xenfb frontend/backend pair for ARM
guests. However QEMU xenpv machine still needs few unapplied fixes to be
built on ARM:

http://marc.info/?l=qemu-devel&m=138739419700837&w=2


> And also CC the maintainers of drivers/video/*
>
> And lastly lets CC also David and Boris on it.

OK

> > 
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> > 
> > diff --git a/drivers/video/xen-fbfront.c b/drivers/video/xen-fbfront.c
> > index cd005c2..02e1c01 100644
> > --- a/drivers/video/xen-fbfront.c
> > +++ b/drivers/video/xen-fbfront.c
> > @@ -692,7 +692,7 @@ static DEFINE_XENBUS_DRIVER(xenfb, ,
> >  
> >  static int __init xenfb_init(void)
> >  {
> > -	if (!xen_pv_domain())
> > +	if (!xen_domain())
> >  		return -ENODEV;
> >  
> >  	/* Nothing to do if running in dom0. */
> 
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