Re: [Xen-devel] SMAP/SMEP issues with 32-bit pv guests

["Wang, Yong Y" <yong.y.wang@xxxxxxxxx>]

> -----Original Message-----
> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Monday, August 1, 2016 6:16 PM
> To: Wu, Feng <feng.wu@xxxxxxxxx>
> Cc: Nakajima, Jun <jun.nakajima@xxxxxxxxx>; Wang, Yong Y
> <yong.y.wang@xxxxxxxxx>; Jan Beulich (JBeulich@xxxxxxxx)
> <JBeulich@xxxxxxxx>; xen-devel@xxxxxxxxxxxxx
> Subject: Re: SMAP/SMEP issues with 32-bit pv guests
> 
> On 28/06/16 02:58, Wu, Feng wrote:
> > Hi Andy,
> >
> > As you know, SMAP/SMEP may affect the 32-bit pv guests, after discussed
> internally, our current idea is that we can just disable this two feature for 
> Xen
> hypervisor itself, hence only enable it for HVM guests. Do you think this is
> acceptable from your perspective?
> 
> So you are suggesting that Xen detects SMEP/SMAP, doesn't turn it on for
> itself, but does allow HVM guests to use it?
> 

Yes, that is correct.

> I suppose that is a slight improvement over the current situation.
> 

Do you mind being a bit more clear on this? Is this something you want to see 
or do you want something else?

Thanks
-Yong


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