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

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Thu, 25 Jul 2013 09:41:17 -0500, David Sutton <kantras@xxxxxxxxx> 
wrote:
> All,
>
> On Thu, Jul 25, 2013 at 4:20 AM, Gordan Bobic  wrote:
>
> On Thu, 25 Jul 2013 12:07:25 +0300, Pasi KÃrkkÃinen  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
> [3]
>  > >
>  >
>  > 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.
>
> 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.
And you don't suffer from a memory stomp resulting
in frame buffer corruption shortly followed by a domU
crash with that much RAM passed to domU?

Gordan

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