Hi Jan & Andrew

I had attached a revised patch, please check it.

I found that the following Linux commit triggers this issue. It has been 
included into 3.4 pv_ops.

" commit a776c491ca5e38c26d9f66923ff574d041e747f4
   Author: Eric W. Biederman <ebiederm@xmission.com>
   Date:   Mon Oct 17 11:46:06 2011 -0700

   PCI: msi: Disable msi interrupts when we initialize a pci device "

Thanks,
Wei