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


On Thu, Jul 25, 2013 at 4:20 AM, Gordan Bobic <gordan@xxxxxxxxxx> wrote:
On Thu, 25 Jul 2013 12:07:25 +0300, Pasi Kärkkäinen <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.

That bug report doesn't include the domU config file, and IIRC
I saw a similar error when device_model/device_model_override and
device_model_version don't match or are unavailable in the build
(e.g. building without upstream and specifying traditional or
vice versa). More info needed to verify, I think.


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And just to add a little more variety, I'm also using traditional (under 4.3) to pass through USB and GPU (Radeon 6770) to a Windows 7 DomU configured with 6Gb for memory. Only using a patch to work around a broken BIOS implementation so I have IOMMU support.


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