lkml.org 
[lkml]   [2013]   [Dec]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition
Date
H. Peter Anvin wrote:
> On 12/06/2013 12:05 PM, Liu, Jinsong wrote:
>>>
>>> Since Peter already said the same, please undo these changes.
>>>
>>> Also, how is XSTATE_EAGER used? Should MPX be disabled when
>>> xsaveopt is disabled on the kernel command line? (Liu, how would
>>> this affect the KVM patches, too?)
>>>
>>> Paolo
>>
>> Currently seems no, and if needed we can add a new patch at kvm side
>> accordingly when native mpx patches checked in.
>>
>
> 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.
>
> Thoughts?
>
> -hpa

The third option seems better -- how does native mpx patches work, force eager?

Thanks,
Jinsong

\
 
 \ /
  Last update: 2013-12-07 00:01    [W:0.128 / U:1.480 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site