ed166e 6 security fixes

Authored and Committed by myoung a year ago
    6 security fixes
    VCPUOP_initialise DoS [XSA-296, CVE-2019-18420]
    missing descriptor table limit checking in x86 PV emulation [XSA-298,
    Issues with restartable PV type change operations [XSA-299, CVE-2019-18421]
    add-to-physmap can be abused to DoS Arm hosts [XSA-301, CVE-2019-18423]
    passed through PCI devices may corrupt host memory after deassignment
    	[XSA-302, CVE-2019-18424]
    ARM: Interrupts are unconditionally unmasked in exception handlers
    	[XSA-303, CVE-2019-18422]
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