RE: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate featuredefinition

[Ren, Qiaowei]

> -----Original Message-----
> From: H. Peter Anvin [mailto:hpa@xxxxxxxxx]
> Sent: Saturday, December 07, 2013 9:07 AM
> To: Ren, Qiaowei; Liu, Jinsong; Paolo Bonzini
> Cc: kvm@xxxxxxxxxxxxxxx; x86@xxxxxxxxxx; Xudong Hao;
> qemu-devel@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Ingo Molnar; Thomas
> Gleixner
> Subject: Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature
> definition
> 
> On 12/06/2013 04:23 PM, Ren, Qiaowei wrote:
> >>>
> >>> We need to either disable these features in lazy mode, or we need to
> >>> force eager mode if these features are to be supported.  The problem
> >>> with the latter is that it means forcing eager mode regardless of if
> >>> anything actually *uses* these features.
> >>>
> >>> A third option would be to require applications to use a prctl() or
> >>> similar to enable eager-save features.
> >>>
> >>
> >> The third option seems better -- how does native mpx patches work,
> >> force eager?
> >>
> > It should be the second option, as you can see xsave.c which we remove
> > from this patch. :)
> >
> 
> Ah yes... I missed the fact that that chunk had been dropped from this patch.
> It really shouldn't be.
> 
> I'll substitute the previous version of the patch.
> 
Jinsong think that both kvm and host depend on these feature definition header file, so we firstly submit these files depended on.

Thanks,
Qiaowei

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