Xen devel - Sep 2012 - x86/passthrough: Fix corruption caused by race conditions between device allocation and deallocation to a domain.

This issue certainly affects unstable, 4.2 and 4.1, and probably affects
previous releases as well.

It has been tested by using 40 VMs with 8 devices passed through to
each, in a reboot loop.  Before the fix, the host would reliably crash
before the end of the first reboot cycle, whereas with the fix, the VMs
are on their 20th reboot cycle with no issue.

-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, citrix.com



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