Re: [Xen-devel] [PATCH v4 1/8] x86: NOP out XPTI entry/exit code when it's not in use

[Juergen Gross <jgross@xxxxxxxx>]

On 19/03/18 14:37, Jan Beulich wrote:
> Introduce a synthetic feature flag to use alternative instruction
> patching to NOP out all code on entry/exit paths. Having NOPs here is
> generally better than using conditional branches.
> 
> Also change the limit on the number of bytes we can patch in one go to
> that resulting from the encoding in struct alt_instr - there's no point
> reducing it below that limit, and without a check being in place that
> the limit isn't actually exceeded, such an artificial boundary is a
> latent risk.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Tested-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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