[lkml]   [2020]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] x86/pkeys: Manually set X86_FEATURE_OSPKE to preserve existing changes
On 2/26/20 3:16 PM, Sean Christopherson wrote:
> Explicitly set X86_FEATURE_OSPKE via set_cpu_cap() instead of calling
> get_cpu_cap() to pull the feature bit from CPUID after enabling CR4.PKE.

First of all,

Acked-by: Dave Hansen <>

I don't remember whether it was you or someone else inside Intel, but
someone was tripping over this recently.

I do think we need a bit more care in how we deal with dynamic CPUID
bits. I think you'd agree that it's a bit haphazard. For instance, I
went looking for where we set X86_FEATURE_OSXSAVE after the


inside fpu__init_cpu_xstate() makes it appear. I couldn't find one, not
that we would notice since we suppress it from /proc/cpuinfo.

 \ /
  Last update: 2020-02-27 00:32    [W:0.049 / U:1.268 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site