lkml.org 
[lkml]   [2008]   [May]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
DateWed, 21 May 2008 18:38:31 -0700
From"H. Peter Anvin" <>
SubjectRe: [RFC] x86: xsave/xrstor support, ucontext_t extensions
Roland McGrath wrote:
>> The biggest potential problem with this that I see is that relying on
>> CPUID can mess with certain virtualization solutions. Another option to
>> accomplish the same thing would be to have a system call (preferrably a
>> prctl, since it is at least in theory personality-dependent) to query
>> what information is included in the fpstate data - since it will always
>> be the same for any particular kernel.
>
> It's easy and cheap to add an indicator to the vDSO for this.

Yes, but I suspect for legacy apps running without vDSO might matter.

-hpa


\
 
 \ /
  Last update: 2008-05-22 03:49    [from the cache]
©2003-2010