RE: [Xen-devel] Bug when disabling/enabling a PT device with MSI enabled

[Kamala Narasimhan <Kamala.Narasimhan@xxxxxxxxxx>]

Couple of questions - 

1) What kind of device are you referring to below?  Display by any chance?
2) Which tree is your dom0 kernel based on?

There is a chance you are missing some msi patches in your dom0 kernel.  You 
might want to do a quick search for msi patches in 
http://xenbits.xen.org/staging/linux-2.6.18-xen.hg?rev=msi and see if you are 
missing anything obvious.  I recently encountered a similar issue in a slightly 
different situation, a subset of the problem was caused because of missing msi 
patches.

Kamala

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Tom Rotenberg
> Sent: Tuesday, November 24, 2009 1:43 PM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] Bug when disabling/enabling a PT device with MSI
> enabled
> 
> Hi,
> 
> I am using the xen-3,4, and i am doing pass-through for a device with
> MSI enabled (the device of-course supports MSI) to a domU with Windows
> XP. When i disable and then re-enable the device using Windows device
> manager, everything looks like it's working fine, but the device seems
> to malfunction.
> After digging a little bit, i saw that the problem is, because the bit
> of the interrupt-status (bit 3) in the status register (offset 0x6 in
> the PCI config space) was turned on somehow -  this proibably caused
> the MSI to malfunction (because the IntX assertion was enabled - thus
> disabling the MSI) - and this lead to the problem i experienced.
> 
> Any ideas on how to solve this issue?
> 
> Tom
> 
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