[Hardy, Intrepid] SRU: Under long-running load test, KVM guest freeze and host oops

[Stefan Bader]

https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/335097

[Jaunty contains the fix.]

SRU justification:

Impact: The function kvm_mmu_remove_write_access() runs under the slots_lock 
protection but the list it walks can be modified by other codepaths using the 
mmu_lock. This causes the host to Oops and the guests will hang.

Fix: Patch backported from upstream to add mmu_lock protection around the list 
walk.

Testcase: Running the validation suite for a longer period of time (24hrs).

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