Re: [Xen-devel] [PATCH 3/4] x86: use optimal NOPs to fill the SMAP/SMEP placeholders

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 04/03/16 11:28, Jan Beulich wrote:
> Alternatives patching code picks the most suitable NOPs for the
> running system, so simply use it to replace the pre-populated ones.
>
> Use an arbitrary, always available feature to key off from.

I would be tempted to introduce X86_FEATURE_ALWAYS as an alias of
X86_FEATURE_LM, or even a new synthetic feature.  The choice of LM is
explained in the commit message, but will be non-obvious to people
reading the code.

~Andrew

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