4d161cd x86: Disallow L3 recursive pagetable for 32-bit PV guests [XSA-185,

Authored and Committed by myoung 7 years ago
    x86: Disallow L3 recursive pagetable for 32-bit PV guests [XSA-185,
    	CVE-2016-7092] (#1374470)
    x86: Mishandling of instruction pointer truncation during emulation
    	[XSA-186, CVE-2016-7093] (#1374471)
    x86 HVM: Overflow of sh_ctxt->seg_reg[] [XSA-187, CVE-2016-7094] (#1374473)
    
        
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