Re: gfx card passthrough broken with latest head

[Chris Wright <chrisw@sous-sol.org>]

* André Weidemann (Andre.Weidemann@web.de) wrote:
<snip>
> >git clone git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git
<snip>
> >./configure --audio-drv-list=alsa --target-list=x86_64-softmmu
> >--enable-kvm-device-assignment
> >
> >ERROR: unknown option --enable-kvm-device-assignment
<snip>
> How come so many revision do not support device assignment? Is there
> a trick to enable it?

Bisection qemu-kvm userspace is tricky.  The upstream qemu repo
(git://git.qemu.org/qemu.git) does not have PCI device assignment
support.  The qemu-kvm repo does regular merges w/ the upstream qemu
repo.  As you bisect through the qemu-kvm repo history, you are likely
to land on a commit that is from upstream (meaning a tree w/out
downstream qemu-kvm additions, like device assignment).

Depending on where you suspect the issue is coming from, you can be
careful to bisect only through the qemu-kvm tree (by skipping back to a
merge point), or you can remerge the qemu-kvm tree to the qemu tree when
you bisect into the qemu tree.

Note...gfx assignment has many issues associated w/ it and often does
not work.  You can check out Allen Kay's presentation at the recent KVM
Forum for some examples: http://goo.gl/Hyk13

thanks,
-chris