Re: Intel HD Graphics 4600 Xen VGA Passthrough to Windows 7 Ultimate HVM domU

[Gordan Bobic <gordan@bobich.net>]

 On Thu, 25 Jul 2013 15:06:21 +0000, "Ren, Yongjie" 
 <yongjie.ren@intel.com> wrote:
>> -----Original Message-----
>> From: Gordan Bobic [mailto:gordan@bobich.net]
>> Sent: Thursday, July 25, 2013 5:21 PM
>> To: Pasi Kärkkäinen
>> Cc: Ren, Yongjie; xen-users@lists.xen.org;
>> singapore.mr.teo.en.ming@gmail.com; Zhang, Xiantao;
>> xen-devel@lists.xen.org
>> 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 Kärkkäinen <pasik@iki.fi>
>>  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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