Re: gfx card passthrough broken with latest head

["André Weidemann" <Andre.Weidemann@web.de>]

Hi,

On 13.08.2011 15:35, André Weidemann wrote:
> Hi,
> I pulled latest git yesterday and noticed that graphics card pass
> through does not work anymore. The VM hangs (probably when initializing
> the gfx card) when passing a graphics card to the VM.
>
> I started to do a git bisect but device assignment does not work at all
> when doing it.
>
> I started like this:
>
> cd /usr/local/src
> git clone git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git
> qemu-kvm-2011-08-12
> cd qemu-kvm-2011-08-12
> git bisect start
> git bisect good fda19064e889d4419dd3dc69ca8e6e7a1535fdf5
> git bisect bad 44755ea36fee3f0b1093ef27404def8857602274
>
> Bisecting: 229 revisions left to test after this
> [55c0975c5b358e948b9ae7bd7b07eff92508e756] Do constant folding for shift
> operations.
>
> ./configure --audio-drv-list=alsa --target-list=x86_64-softmmu
> --enable-kvm-device-assignment
>
> ERROR: unknown option --enable-kvm-device-assignment
>
> What am I doing wrong?

I continued with "git bisect bad" from this point on, but up to where I 
started, no revision supported device assignment.

I then did a "git bisect reset" and started over again. Now I continued 
with a few "git bisect good" until a revision came up that supported 
device assignment, but then after compiling and running 
qemu-system-x86_64, it exited with a segmentation fault. I continued 
with "git bisect good" until the end but all revision supporting device 
assignment existed with a segmentation fault.

How come so many revision do not support device assignment? Is there a 
trick to enable it?

Any help in this matter is greatly appreciated.

Regards
  André