9d8391a 5 security updates

Authored and Committed by myoung a year ago
    5 security updates
    
    incorrect error handling in event channel port allocation leads to
    	DoS [XSA-317, CVE-2020-15566] (#1854465)
    inverted code paths in x86 dirty VRAM tracking leads to DoS
    	[XSA-319, CVE-2020-15563] (#1854463)
    xen: insufficient cache write-back under VT-d leads to DoS
    	[XSA-321, CVE-2020-15565] (#1854467)
    missing alignment check in VCPUOP_register_vcpu_info leads to DoS
    	[XSA-327, CVE-2020-15564] (#1854458)
    non-atomic modification of live EPT PTE leads to DoS
    	[XSA-328, CVE-2020-15567] (#1854464)
    
        
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