Re: [Xen-devel] [Xen VGA Passthrough] Cannot Complete All 3dmark Tests in Windows 8 HVM domU

["Zytaruk, Kelly" <Kelly.Zytaruk@xxxxxxx>]

Hi Gordan,

Your request comes at a very opportune time.  I have just started looking into 
asic reset and FLR support.
I found your thread at 
http://xen.1045712.n5.nabble.com/Re-VGA-passthrough-with-Xen-4-3-and-xl-toolstack-performance-degradation-resolved-td5721581.html

I notice that there is mention of two patches; one for PCI bus reset and one 
for secondary passthru.  I have seen a couple very old patches for primary 
passthru but I haven't looked at these two yet.  If you could forward me a link 
to these patches I can quickly take a look and see whether it makes more sense 
to put a fix into QEMU or into the graphics driver.

Thanks,
Kelly

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxx] On Behalf Of Gordan Bobic
> Sent: Friday, September 12, 2014 6:11 AM
> To: xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [Xen VGA Passthrough] Cannot Complete All 3dmark
> Tests in Windows 8 HVM domU
> 
> On 2014-09-11 19:35, Zytaruk, Kelly wrote:
> 
> > I myself am still using Win7  in the DomU and have not yet
> > experimented with Win8.1.  I find Win7 very stable and it has not
> > given me any problems as a guest OS.
> 
> Ooo, an actual AMD person on the list! :D
> 
> Speaking if ongoing problems, any chance of a few fixes and feature un-
> removals in the Windows driver?
> 
> 1) Issue a bus reset to the device at driver load/unload time to remove the 
> need
> to eject the device at shutdown when running virtualized. I cannot be the only
> one cursing having no choice but to use Nvidia cards if I need to be able to
> seamlessly reboot my domUs with GPUs. I had a pair of R9 290X cards and had
> to trade them in for 780Tis.
> 
> 2) Expose stretched desktop modes to full screen DirectX apps.
> I couldn't get anything working in 3840x2400 because my monitor shows up as
> two separate 1920x2400 screens. The highest resolution desktop stretch mode
> available was, IIRC, 3200x900 which is quite useless. The problem will only 
> get
> bigger with the newly announced 5120x2880 monitor from Dell that will show
> up as 2x 2560x2880 over two DP inputs.
> 
> For bonus points:
> 
> 3) Make the driver do what the monitor driver says, rather than always blindly
> following what EDID says
> 
> 4) Make the driver not crash with R9 cards on NF200 PCIe bridges. HD7970
> works, so why don't R9s?
> 
> I would love dearly to be able to switch to AMD GPUs, but the drivers just 
> don't
> meet the minimum usability requirements.
> 
> Gordan
> 
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