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

[Matthias <matthias.kannenberg@xxxxxxxxxxxxxx>]

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!

Attachment: xen-unstable-atipassthrough.patch
Description: Binary data

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