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Re: [Xen-users] GPU passthrough with xen 4.2.1 on ubuntu 12.10

Yes, this is exactly the behaviour I'm seeing.. dual vga passthrough
works fine, but when hiding two vga's from dom0 and doing a shutdown
in the passthrough-domU, the dom0 breaks down and i have to reset the
whole server.. When only hiding one VGA and leaving the second to the
dom0, this does not happen..

Would you be so kind and post a "Me too"-post to the thread i linked
there and cc xen-user and xen-devel? It's just to raise some

2013/3/14 Matthew Dean <mcd40@xxxxxxxxx>:
> I can report some more success and a little bit of failure.  I added the
> second GPU and was able to simultaneously do primary passthrough of the two
> cards to two different domUs.  I have however noticed a problem with
> passthrough that seems to exist regardless of how many GPUs I have plugged
> in.  Whenever I shutdown a domU, which has a passed through GPU, and then
> start it up again my entire dom0 locks out and I have to hard reset the
> whole box.  To get around this I instead have to shutdown all of my domUs
> and then restart the whole box before starting them up again.  For me this
> is not a massive issue as the end game is to have the vms running all the
> time without need for regular restarting but it is an issue none the less.
> I'm going to take a break from this for now but will come back to it in a
> couple of weeks, I just thought I'd let people know my experiences. Thanks
> again for everybody's help.
> Matt
> On 13/03/2013 21:06, Matthias wrote:
>> Congrats!
>> But so you don't get overly excited, dual vga passthrough sems to be
>> broken at the moment. Been down that road (Thread:
>> http://xen.1045712.n5.nabble.com/dual-vga-passthrough-issue-in-xen-unstable-td5714613.html),
>> posted to xen-user and xen-devel, but never got a response.
>> Would be interesting to see if it works for you.
>> Oh, and just for my record-keeping: Have you used my patch or the
>> original one from Greg?
>> 2013/3/13 Matthew Dean <mcd40@xxxxxxxxx>:
>>> Just to let everyone know that patch worked like gold for me.  My HD 7970
>>> is
>>> now being passed through as the primary adapter with driver version 13.1
>>> and
>>> up to now all seems to be working.  Will run further tests over the next
>>> few
>>> days to make sure it stays that way and I'll probably test secondary
>>> passthrough also.  Once that's done I need to put the second card back in
>>> and have a bit of a play but this is by far the furthest I've been in the
>>> last 2 weeks.  Thanks to everybody for your advice.
>>> Matt
>>> On 12/03/2013 19:42, Matthias wrote:
>>>> Hi,
>>>> to fix the atikmeq.sys bug, you can try two things:
>>>> 1) Use upstream qemu. For this, just add:
>>>> device_model_version = 'qemu-xen'
>>>> device_model_override = '/usr/lib/xen/bin/qemu-system-i386'
>>>> to your domU config file. Note that there is currently a bug that the
>>>> domU won't start when duing vga passthrough with more then 4GB memory
>>>> assigned, so better use some less..
>>>> 2) If you want to have more then 4GB memory, you can patch the
>>>> traditional qemu. This is a bit more complicated cause the qemu stuff
>>>> is download through the build and can't be patched right away. Also
>>>> stopping in mid build, patching and continuing at least for me caused
>>>> some problems, so doing a full build, patch, cleanup and build again
>>>> is the safer route:
>>>> git clone -b staging git://xenbits.xen.org/xen.git xen-unstable-staging
>>>> cd xen-unstable-staging
>>>> ./configure --disable-stubdom
>>>> make -j12 world
>>>> git apply --check /path/to/xen-unstable-atipassthrough.patch
>>>> git apply /path/to/xen-unstable-atipassthrough.patch
>>>> make -j12 clean
>>>> make -j12 world
>>>> Now do your usual install.. some use the standard, i prefer creating a
>>>> debball..
>>>> Some Notes:
>>>> - I use the staging branch from xen-unstable, but this is not exactly
>>>> necessary for the patch, you can use master just as fine
>>>> - the j12 is for multithreading and you should use double your core
>>>> number.. since i got 6 cpu cores, it's 12 for me..
>>>> - the patch i have attached is originally from Greg
>>>> (http://lists.xen.org/archives/html/xen-devel/2012-12/msg00009.html),
>>>> so credit goes to him, i only cleaned it up for xen-unstable. Also,
>>>> the patch itself was for providing primary passthrough with ATI cards,
>>>> but i found it fixing my ati 0x116 bluescreen..
>>>> - due to an insufficiancy in the patch, stubdom would not build
>>>> correctly, so you have to disable it
>>>> Please report back if the patch fixes your bluescreen for more
>>>> argumentation to bring this patch upstream.. :)  (@Greg: that's why i
>>>> cc'ed you. hope you don't mind the noise)
>>>> Hope it helps!
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