Re: [Qemu-devel] VFIO VGA test branches

[Alex Williamson <alex.williamson@redhat.com>]

On Sun, 2013-05-19 at 23:26 +0400, Maik Broemme wrote:
> Hi Knut,
> 
> Knut Omang <knuto@ifi.uio.no> wrote:
> > 
> > On Mon, 2013-05-13 at 16:23 -0600, Alex Williamson wrote:
> > > On Mon, 2013-05-13 at 22:55 +0200, Knut Omang wrote:
> > > > Hi all,
> > > > 
> > > > Perfect timing from my perspective, thanks Alex!
> > > > 
> > > > I spent the better part of the weekend testing your branches on a new system 
> > > > I just put together for this purpose, results below..
> > > > 
> > > > On Fri, 2013-05-03 at 16:56 -0600, Alex Williamson wrote:
> > > > ...
> > > > > git://github.com/awilliam/linux-vfio.git vfio-vga-reset
> > > > > git://github.com/awilliam/qemu-vfio.git vfio-vga-reset
> > > > 
> > > > System setup: 
> > > > 
> > > > - Fedora 18 on
> > > > - Gigabyte Z77X-UD5H motherboard
> > > > - Intel Core i7 3770 (Ivy bridge w/integrated graphics)
> > > > - 2 discrete graphics cards:
> > > > 
> > > > lspci | egrep 'VGA|Audio'
> > > > 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09)
> > > > 00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
> > > > 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Caicos [Radeon HD 6450]
> > > > 01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Caicos HDMI Audio [Radeon HD 6400 Series]
> > > > 02:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Cape Verde PRO [Radeon HD 7700 Series]
> > > > 02:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cape Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series]
> > > > 
> > > > Short summary:
> > > > 
> > > > - Once I got past a few time consuming obstacles explained below
> > > >    - the graphics part of the graphics/hdmi audio passthrough seems to work perfect
> > > >      on both discrete graphics cards 
> > > >      (though so far only one at at time and with some minor issues, see below)
> > > >    - no success with the hdmi audio yet (ideas for further investigation appreciated!)
> > > 
> > > I've had hdmi audio working with an HD7850, but only in Windows (7) and
> > > it was using legacy interrupts for some reason instead of MSI.  I wonder
> > > if Liux guests might work with snd_hda_intel.enable_msi=0.  I'm not sure
> > > what's wrong with MSI, but it seems to be new with the PCI bus reset
> > > support.
> > 
> > In my first tries, Windows were just using a generic
> > VGA driver, which still seems to work perfect with reboots and everything 
> > and in full screen resolution (1920x1200).
> > However after installing the Catalyst AMD driver stack, upon boot
> > Windows 7 now consequently get a BSOD from the graphics driver
> > with the message:
> > 
> > "Attempt to reset the display driver and recover from timeout failed"
> > - a picture of the BSOD screen attached.
> > 
> > I attach the corresponding vfio log where I added some timing code to
> > make it easier to see when the BSOD happens (with 2 seconds of silence
> > in the log before the VM reboots, I believe this is at 09:28:32-34 in
> > the log.
> > 
> > Similar behaviour both just after reboot/power cycle of the host and
> > subsequent VM boot attempts.
> > 
> > This is still with the HD7700 as passed through device, but after a
> > motherboard firmware upgrade (to F14) which did not seem to affect the
> > observed behaviour on Windows prior to Catalyst install or with Linux
> > guest, neither did it fix the bug in selecting primary devices as I 
> > was hoping for.
> > 
> > Let me know if you have ideas for further debugging this,
> > 
> 
> I had a similar problem a couple of days ago and posted it in this list.
> I got similar BSOD and tested already the following configurations:
> 
> 1) machine: q35 / kvm: yes / vga: none   / x-vga: on  = qemu freeze
> 2) machine: q35 / kvm: no  / vga: none   / x-vga: on  = qemu freeze
>    (with errors below)
> 3) machine: q35 / kvm: yes / vga: none   / x-vga: off = qemu runs with
>    100% CPU due to no VGA init (no picture)
> 4) machine: q35 / kvm: yes / vga: cirrus / x-vga: off = qemu runs with
>    BOSD on loading atikmpag.sys
> 5) machine: pc  / kvm: yes / vga: cirrus / x-vga: off = qemu runs fine
> 
> However I've re-run the BSOD case already with the following branches
> from Alex:
> 
> git://github.com/awilliam/linux-vfio.git vfio-vga-reset
> git://github.com/awilliam/qemu-vfio.git vfio-vga-reset
> 
> Also with latest seabios and it worked so far. No more BSOD and reboot
> of VM was also possible without suspend / resume the host between.

Good to hear.  It looks like you have the same motherboard as my AMD
test system.  An HD7850 in that system runs quite reliably with the
branches above although I do occasionally get VGA palette corruption.

Are you still require -vga cirrus or do the -vga none, x-vga=on cases
work now too?  Thanks,

Alex