Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition

[H. Peter Anvin]

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.

        -hpa