Re: [Xen-devel] [PATCH 1/2] libxl: set stdvga=1 by default when creating a hvm guest

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 27 Jun 2012, Pasi KÃrkkÃinen wrote:
> On Wed, Jun 27, 2012 at 11:51:05AM +0100, Stefano Stabellini wrote:
> > On Wed, 27 Jun 2012, Pasi KÃrkkÃinen wrote:
> > > On Wed, Jun 27, 2012 at 01:45:49AM +0000, Ren, Yongjie wrote:
> > > > > -----Original Message-----
> > > > > From: Stefano Stabellini [mailto:stefano.stabellini@xxxxxxxxxxxxx]
> > > > > Sent: Wednesday, June 27, 2012 1:00 AM
> > > > > To: Ian Campbell
> > > > > Cc: Ren, Yongjie; xen-devel@xxxxxxxxxxxxx; Ian Jackson; Tim (Xen.org);
> > > > > Stefano Stabellini
> > > > > Subject: Re: [PATCH 1/2] libxl: set stdvga=1 by default when creating 
> > > > > a hvm
> > > > > guest
> > > > > 
> > > > > On Tue, 26 Jun 2012, Ian Campbell wrote:
> > > > > > On Tue, 2012-06-26 at 07:02 +0100, Ren, Yongjie wrote:
> > > > > > > libxl: set stdvga=1 by default when creating a hvm guest
> > > > > > >
> > > > > > > Most of the modern OSes (e.g. Windows XP, Windows 7, RHEL6.x,
> > > > > Ubuntu, Fedora) support VBE 2.0 or later.
> > > > > > > So, select a standard VGA card with VBE as the default emulated
> > > > > graphics device.
> > > > > >
> > > > > > I'm not expert on the graphics side of HVM, but on the face of it
> > > > > > switching the default to something more modern seems like a
> > > > > reasonable
> > > > > > idea, although I'm not sure if we should be doing this for 4.2 at 
> > > > > > this
> > > > > > point.
> > > > > >
> > > > > > I've CCd Tim and Stefano for input from the HVM and QEMU sides.
> > > > > 
> > > > > I think it is a good thing.
> > > > > The only thing to keep in mind is that QEMU upstream is switching to
> > > > > 16MB of videoram for stdvga. So at some point in the near future
> > > > > upstream QEMU will stop working correctly with xen 4.2, unless we bump
> > > > > the videoram to 16MB too.
> > > > > 
> > > > Yes, we should pay attention to this when using upstream QEMU.
> > > > 
> > > 
> > > Earlier there was a discussion about upstream QEMU lacking support
> > > for being able to specify/configure the amount of videomem.
> > > 
> > > You can do that with the current qemu-xen-traditional. 
> > > Should those patches be upstreamed? 
> > 
> > QEMU is getting a configurable videoram in the same patch series it is
> > getting 16MB by default for stdvga.
> >
> 
> Oh, nice. That should help then?

Yes, but problem of the default value still exists.
Nowadays distros expect to be able to take upstream QEMU and use it with
Xen, but if we are not careful it might break when the next QEMU release
is out (1.2.0).

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