RE: [Xen-devel] xci pci passthru video card flr etc

["Han, Weidong" <weidong.han@xxxxxxxxx>]

Andrew Lyon wrote:
> Hi,
> 
> I want to try using pci passthru to give a windows 7 hvm access to a
> dedicated video card, I've read all of the threads I can find about
> video passthru but I still have some questions:
> 
> I use rebased opensuse Xen patches to make the dom0 kernel, currently
> running 2.6.29 as there are networking problems with gplpv and 2.6.30,
> I believe it is necessary to use Function Level Reset to reset the
> graphics card before the hvm domU boots, otherwise it will be
> incorrectly initialized by the bios or dom0 ? and therefore will not
> function correctly, I plan to rebase the following patches to
> 2.6.29/30 to enable FLR:
> 
> http://xenbits.xen.org/gitweb?p=xenclient/linux-2.6.27-pq.git;a=commit;h=50c08c0d3e499c5576e906ab5f0c9c234fba2493
> http://xenbits.xen.org/gitweb?p=xenclient/linux-2.6.27-pq.git;a=commit;h=b631b9005cd72b0e2e859dd1fab557a3015c8b58
> http://xenbits.xen.org/gitweb?p=xenclient/linux-2.6.27-pq.git;a=commit;h=36083d0755a740ed509ca9812db9576473bc4e8b
> 
> Are all 3 patches required? are any other patches required? what about
> patches to Xen?
> 
> The http://xenbits.xen.org/gitweb?p=xenclient/linux-2.6.27-pq.git
> patchqueue includes pull's from other trees, is there anything in them
> that I need for FLR or other necessary new features?
> 
> I am currently running Xen 3.4 but plan to upgrade to the latest
> 3.4.1-rc before I try video passthru, I've already patched 3.4 to fix
> the problem with viridian and windows 7, I assume that fix will be
> included in 3.4.1 as it is in testing
> (http://lists.xensource.com/archives/html/xen-changelog/2009-06/msg00119.html)
> 
> My system currently has a 512mb 8600GT which I use with the nvidia
> binary drivers driving a pair of 1920x1200 tft's, I think I can get
> access to another identical 8600GT so I plan to drive one monitor with
> each card, has anybody had success with passthru using nvidia cards?

We observed that it needs vBAR = pBAR (1:1 map memories of video card in guest 
and host) for some Nvidia cards, such as Geforce 8400 GS. But some high-end 
Nvidia cards (e.g Quadro FX 3800) don't require that, they are more 
virtualization friendly.

Regards,
Weidong


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