4ca959b xen: various flaws (#1447345)

Authored and Committed by myoung 6 years ago
    xen: various flaws (#1447345)
      x86: 64bit PV guest breakout via pagetable use-after-mode-change [XSA-213]
      grant transfer allows PV guest to elevate privileges [XSA-214]
    
        
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