Re: [Xen-users] Problems with VGA Passthrough

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 07/11/2013 06:52 PM, dkeruza wrote:
> Did you install the GPLPV drivers? if you did, that is the problem.
> Also, Make sure you blacklist the radeon driver.
> When you get a chance, post the lspci list here and the vm config file. I
> wanna see what the problem could be with your USB controller.
> Also, make sure the BIOS in your motherboard is updated.
Not sure about the OPs USB controller PCI passthrough issue, but 
reviewing the configuration changes between when I reliably had a host 
crash from rebooting domUs with VGA passthrough, the only thing that had 
changed was the passthrough of USB controllers. Originally I was passing 
through 2 USB controllers, and immediately after a domU shutdown, I'd 
get an error in syslog about a missed interrupt on an interrupt shared 
between a USB controller and something else (I forget what else it was, 
I can find out later.).
It turned out that I had 2 ports on each of the USB controller devices, 
rather than 1, so I re-arranged the keyboards/mice so that I was passing 
only one controller with 2 devices to the domU. Ever since I did that 
the IRQ error went away on domU shutdown/reboot, and the domU rebooting 
has been working perfectly. The controller I was passing through before 
is now for dom0's keyboard and mouse, so I'm pretty sure that it was 
passthrough of that specific PCI device that was causing the problem 
(why it would crash the GPU before anything else remains a mystery). If 
I had to guess, it's got something to do with IRQ sharing. Note: All USB 
controllers in question are the ones in the ICH10 SB, but the ones I'm 
successfully using now and the ones that seemed to be responsible for 
dom0 crashes on domU reboots.
I'm hoping this might be useful to someone as a data point that suggests 
that the device that seems to crash isn't necessarily the device that is 
the root cause of the crash when passing through multiple PCI devices.
Gordan

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