Fwd: Graphics pass-through

[Prasad Joshi <prasadjoshi124@gmail.com>]

Hello,

This is to announce that, we have been able to pass-through a ATI
Radeon RV370 FireGL V3100 to Ubuntu VM. This card was attached to a
separate monitor, after passing-through the Keyboard and Mouse
everything worked as normal.

The changes we made are very less, mostly disabling default QEMU VGA.

But there are few problems that we are still working on
1. The display on the monitor, probably only appears after the KMS is
enabled. It does not display the grub menu and booting log.

2. If we intermix the QEMU default devices like Network or another
VGA. The VM does not work properly. We could see IO_PAGE_FAULT events
being logged in the system messages. I guess this is happening because
of some memory region conflicts.

But if we pass-through a Network device and a GPU card to VM it works
perfectly. Till now we only observed problem when QEMU default devices
were intermixed with the pass-through ATI card.

3. Windows does not work at all. No display, lots of IO_PAGE_FAULT events.

4. The card that we used is somewhat old one. "André Weidemann"
<Andre.Weidemann@web.de> is trying to pass-through a relatively new
ATI card. We will have results very soon.

5. Nvidia or Intel IGD cards have not been tested.

Currently I am focusing on solving problem 2 and 1. I am very new to
KVM and QEMU, I will appreciate if someone can help me or point me to
a correct direction. Once these problems are solved I will send the
patches for comments on this mailing list.

Thanks and Regards,
Prasad