Re: Device pass-through

[Gordon Messmer <yinyang@eburg.com>]

On 01/05/2012 11:07 AM, Gordon Messmer wrote:
> I started with an update to seabios, from the bundled version
> 0.6.1.2-8.el6 to a rebuilt package from F16, 0.6.2-3.el6. That's enough
> to get the guest to boot with the pass-through video card. It doesn't
> work, currently, and I'm pretty sure that's because I can't read the ROM
> from the card. I'm going to look around for a solution to that and will
> update again.

Well, I finally figured out that I have to enable the reading of roms 
from the device by writing "1" to the "rom" node in /sys/.  Now the 
problem is that the rom is 64k, and only 32k are making it into the 
guest.  I saw a reference to this problem here:
http://www.spinics.net/lists/kvm/msg49946.html

I've updated seabios to 0.6.3, and I've rebuilt the qemu-kvm packages 
from F16 on CentOS 6.2 to try those.  It took a while, but didn't change 
the results.  I'm still only able to read 32k of rom from the node in 
/sys/ in the guest.

Perhaps I'd have better luck with a different card.

In the meantime, thanks for your advice.  I think I'm close, and I'll 
keep working on the project.  If I get it working, I'll send along 
further details with the steps I had to take.