Re: [Xen-devel] [PATCH] x86: make SMEP/SMAP suppression tolerate NMI/MCE at the "wrong" time

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 17/05/16 14:43, Jan Beulich wrote:
> There is one instruction boundary where any kind of interruption would
> break the assumptions cr4_pv32_restore's debug mode checking makes on
> the correlation between the CR4 register value and its in-memory cache.
> Correct this (see the code comment) even in non-debug mode, or else
> a subsequent cr4_pv32_restore would also be misguided into thinking the
> features are enabled when they really aren't.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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