Re: [Xen-devel] [Patch] Enable SMEP CPU feature support for XEN itself

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 03/06/2011 12:54, "Li, Xin" <xin.li@xxxxxxxxx> wrote:

>>> The whole point of setup_clear_cpu_cap() is that it only needs to run on the
>>> BP and the change gets picked up by every AP automatically as it boots.
>> 
>> Yeah, and we can't do leaf 7.0 detect in generic_identify. Or will again set
>> SMEP in
>> capabilities, but it should be ok.
> 
> I tried to not do leaf 7.0 detect on AP booting code, but system behaves
> abnormally
> (not hang, but "su -" never returns, after just revert the change, it runs
> well).
> 
> While at this point I want to focus on SMEP logic, we can make the
> improvements,
> to move such initialization to BP code only, later.  Also it makes no much
> sense to only
> move disable_smep that way, we should move all such variables.

Just get another rev of the patches out and we'll iterate if necessary.

 -- Keir

> Thanks!
> -Xin



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