Re: [Xen-devel] [PATCH 1/2] AMD/VPMU: 0xc0010000 - 0xc001007 MSRs are in PMU range

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.08.16 at 17:05, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 08/08/2016 10:09 AM, Jan Beulich wrote:
>>> The reserved bits look the same on all supported families --- bits
>>> 63:42, 39:36, 21 and 19. Except apparently on family 12h bit 19 is MBZ.
>> Isn't MBZ == reserved for all practical purposes? 
> 
> My understanding is that when something is MBZ we know we shouldn't
> write 1 there. Reserved can be either 1 or 0 --- that's what my system
> may have with bit 19 set. (Although it's also possible that POST or BIOS
> are sloppy).

All understood, yet for us it still means: Don't touch those bits.

Jan


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