Re: [Xen-users] [Xen-devel] Intel HD Graphics 4600 Xen VGA Passthrough to Windows 7 Ultimate HVM domU

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Thu, 25 Jul 2013 15:06:21 +0000, "Ren, Yongjie" 
<yongjie.ren@xxxxxxxxx> wrote:
> > -----Original Message-----
> > From: Gordan Bobic [mailto:gordan@xxxxxxxxxx]
> > Sent: Thursday, July 25, 2013 5:21 PM
> > To: Pasi KÃrkkÃinen
> > Cc: Ren, Yongjie; xen-users@xxxxxxxxxxxxx;
> > singapore.mr.teo.en.ming@xxxxxxxxx; Zhang, Xiantao;
> > xen-devel@xxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] Intel HD Graphics 4600 Xen VGA Passthrough 
> > to
> > Windows 7 Ultimate HVM domU
> >
> >  On Thu, 25 Jul 2013 12:07:25 +0300, Pasi KÃrkkÃinen <pasik@xxxxxx>
> >  wrote:
> > > On Thu, Jul 25, 2013 at 08:58:58AM +0000, Ren, Yongjie wrote:
> > >> > > N.B. I didn't use the latest traditional qemu because of the
> > >> following bug:
> > >> > >
> > >>
> >
> > http://bugzilla-archived.xenproject.org//bugzilla/show_bug.cgi?id=1865
> > >> > >
> > >> >
> > >> > Hmm.. isn't that bug affecting qemu-traditional in general, not
> > >> PCI/GPU
> > >> > passthru specifically?
> > >> > Or is it *only* PCI/GPU passthru that it breaks for you?
> > >> >
> > >> It's a general device assignment issue.
> > >> Any PCI device can't be assigned to a HVM guest with the latest
> > >> qemu-traditional.
> > >>
> > >
> > > Ok. Is there already a separate thread on xen-devel about the
> > > qemu-traditional PCI assignment issue?
> > > If not, we should create one.
> >
> >  FWIW, I'm using qemu-dm (i.e. traditional) in 4.3 and am 
> > successfully
> >  passing USB, audio, GPU PCI devices using it (as long as I stay 
> > under
> >  the 2GB domU RAM limit). So whatever the issue is it isn't generic.
> Hi Gordan,
> Can you give me the commit of the traditional-qemu with which you can
> successfully pass through USB/GPU to a guest ?
> If your commit is before that culprit commit in that bugzilla, it 
> should be
> certainly successful for you to do device passthrough.
I am using unpatched 4.3.0 release version. It also worked for me
with 4.2.2. The bug report above may be bogus - there is no
config that was being used provided, and I recall seeing a similar
error when I had a typo in my device_model/device_model_override or
device_model_version config options. If you are seeing a similar
error, make sure the values you have set are as follows (adjust
to correct path to your qemu-dm):

device_model_override="/usr/lib/xen/bin/qemu-dm"
device_model_version="qemu-xen-traditional"

Gordan

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