3.18.17 Xen regression

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

Commit 63753fac67e1 ("x86: Store a per-cpu shadow copy of CR4") in 
3.18.y branch introduced a regression on PVH Xen guests.

Please apply 5054daa285be ("x86/xen: Initialize cr4 shadow for 64-bit 
PV(H) guests") from mainline to fix this. 3.18.y appears to be the only 
affected branch.


Thanks.
-boris
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