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

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Message-ID: <alpine.DEB.2.02.1312181730290.8667@kaball.uk.xensource.com>
Date:	Wed, 18 Dec 2013 17:32:22 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	<david.vrabel@...rix.com>, <xen-devel@...ts.xensource.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] allow xenfb initialization for hvm guests

On Wed, 18 Dec 2013, Konrad Rzeszutek Wilk wrote:
> On Wed, Dec 18, 2013 at 03:18:45PM +0000, Stefano Stabellini wrote:
> > On Wed, 18 Dec 2013, Konrad Rzeszutek Wilk wrote:
> > > On Wed, Dec 18, 2013 at 11:51:22AM +0000, Ian Campbell wrote:
> > > > On Tue, 2013-12-17 at 17:53 +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.
> > > > 
> > > > and if a toolstack did I think it would be reasonable to expect the
> > > > kernel to at least try and drive it!
> > > > 
> > > > > Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> > > > 
> > > > Acked-by: Ian Campbell <ian.campbell@...rix.com>
> > > 
> > > I think David Vrabel is going to Nack it unless there is a test-case.
> > > 
> > > I am saying that because in his previous statement for Wei's multi-page
> > > patches was that if there are no users (or at least no test-cases) then
> > > it should not be part of the kernel.
> > 
> > Well there is one: ARM. There isn't one on x86.
> > 
> > http://marc.info/?l=xen-devel&m=138730150806639&w=2
> 
> Ah I missed that. I think that this particular patch can wait till the
> next merge window?

Surely it can wait.


> Would it make sense to have the XenFB also work on x86? Is it difficult
> to make it work on it?

The issue is that you need stdvga anyway in order to boot and xenfb is
not much better than stdvga after all (except that it doesn't require
QEMU's pc machine emulator).
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