Re: [Xen-users] VGA/PCI Passthrough of Secondary Graphics Adapter

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 04/28/2013 02:30 AM, Casey DeLorme wrote:

> The BSoD you are encountering, does it happen when you reboot?  In my
> experience this is caused by the lack of FLR (Function Level Reset) in
> consumer cards,
I am not entirely convinced of that, mainly because I have yet to see 
lspci output showing that Quadro cards have FLreset+. From what I can 
tell the only difference is the device PCI ID. When it is detected the 
driver decides that since you paid a 4x premium for the card, it will 
reset the card for you by wiping the registers when asked to do so.
Can somebody demonstrate otherwise, with lspci output showing FLreset+ 
on a Quadro FX [345]000 or Quadro [246]000 card?
As far as I can tell, Nvidia have a reasonably decent driver that 
handles card reinitialization gracefully in a VM encironment, while ATI 
have one of far more questionable quality (but more open, it seems).
Also, does anyone have an ATI FirePro card that they could post lspci 
output from? I can believe that those might have FLreset+ to compensate 
for the driver not being up to the task.
> the solution is manual ejection and if you install
> drivers without being aware of the problem it will still experience odd
> problems.
What is this "manual ejection" I see mentioned? How exactly do you do 
that from dom0?
> Experience varies however, my advice would be to check the marksmail
> <http://xen.markmail.org/>search engine for Function Level Reset or
> Passthrough BSOD.
Or just get an Nvidia card modifiable to a Quadro and modify it (or just 
buy a Quadro if you can afford it and lack the required soldering 
experience), instead of wasting infeasible amounts time getting an ATI 
card to work reliably. I have seen a number of posts in the archives 
from people who have had nothing but problems with ATI cards only to 
find that a Quadro card works perfectly every time.
Gordan

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