Re: [Xen-devel] [PATCH v1 1/2] x86/mm: Add mem access rights to NPT

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 30.05.18 at 11:04, <aisaila@xxxxxxxxxxxxxxx> wrote:
> Sorry for the misunderstanding, I wanted to clarify if the 59:56 bits
> are fully ok to be used or if not then where should I use 4 bits to
> store the mem access info?

I thought I had sufficiently explained this - you have two options:
1) Make sure (via some prereq patch(es)) bit 59 has no other use, and
   then use 59:56.
2) Use another range that's provably having no other use, e.g.
   58:55.

Jan



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