Re: [Xen-users] PCI Passthrough

[Casey DeLorme <cdelorme@xxxxxxxxx>]

The settings for stdvga is related to the emulated graphics only, I don't believe it has anything to do with your passed devices.  Similarly, you can (or should be able to) omit the vga_passthrough=0 line, as it defaults to 0.

Assuming you are passing to a Windows DomU (hence code 43), have you checked your xen log files (/var/logs/xen), also I would try running xl -vvv create with and without both adapters to see if that maybe yields a clue.

Also, what version of Xen did you install, and which toolstack are you using (xm/xl)?

On Sat, Sep 29, 2012 at 1:01 PM, David Escott <david.escott@xxxxxxxxxxxxxxxx> wrote:

Went back to what was working last night and now have the 7850 working
but only when I pass both graphics adapters through to the domU.

Hardware is

MSI Z77A-G45
HD2600XT in PCI-Ex16 slot 1 (pci:0000:01:00:[0-1])
HD7850     in PCI-Ex16 slot 2 (pci:0000:02:00:[0-1])

Dom0 is Fedora 17 with kernel 3.5.4-1 and the fedora version of xen.
vga_passthrough=0 is set
stdvga=1 is set
I stub out and pass both graphics adapters to domU, and then disable
the 2600XT at which point the 7850 works, and the fake VGA Graphics
adapter reports a code 43.

If I don't pass both cards to domU then both they will report code 43.

Not sure why this is, or what is going on. Looked around in the bios
for anything related to crossfire but couldn't find anything.

----------------------------------------------------------------------------------------------------

This puts a dent in my current plan which was to use the system to
support three different computers in three different rooms. Not sure
if anyone has seen anything like this/knows what might be going on.

On Sat, Sep 29, 2012 at 11:20 AM, Casey DeLorme <cdelorme@xxxxxxxxx> wrote:
> Hello David,
>
> I have created a guide using Debian that can successfully reproduce VGA
> Passthrough with AMD Radeon cards, in particular I have used an AMD Radeon
> 6870.
>
> If you are more familiar with Fedora, I'm sure you can translate any Debain
> specific actions to Fedora equivalents.
> http://wiki.xen.org/wiki/Comprehensive_Xen_Debian_Wheezy_PCI_Passthrough_Tutorial
>
> I also posted a video walk-through:
> http://www.youtube.com/playlist?list=PLC70DC33D993CEB44&feature=view_all
>
> As for your current configuration, what version of Xen (4.0, 4.1.2, 4.2?),
> can you share your HVM Configuration, and are you getting any errors in your
> Xen log files or just inside of Windows?
>
>
> On Sat, Sep 29, 2012 at 11:10 AM, David Escott
> <david.escott@xxxxxxxxxxxxxxxx> wrote:
>>
>> I've been playing around with doing PCI passthrough of Radeon cards
>> and have had some success.
>>
>> Under Fedora 17 (stock everything) I was able to passthrough an older
>> RADEON 2600XT to a Windows7 domU.
>> However when I try the same with a new RADEON 7850 I get a "not enough
>> resources" error from the Windows guest.
>>
>> I'm not sure what the next steps are, it seems from blog postings and
>> howtos that people are just trying things at random, and I don't
>> understand what the debugging process is.
>>
>> Any advice on what the next steps are? Should I move to an OS that
>> will have a newer XEN or is there some configuration file I should be
>> editing?
>>
>> Thanks,
>> David
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-users
>
>

--
David Wright Escott
A comathematician turns cotheorems into phi.

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