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[Xen-devel] VPMU backports for 4.6

There two patches need to be backported to 4.6

fb424bf x86/VPMU: don't allow any non-zero writes to MSR_IA32_PEBS_ENABLE
31af0d7 x86/VPMU: check more carefully which bits are allowed to be written to MSRs

(The second patch somewhat depends on
00e248c x86/VPMU: support only versions 2 through 4 of architectural performance monitoring
so it may need to be backported as well).


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