[lkml]   [2018]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC PATCH 04/10 v2 ] x86/fpu: eager switch PKRU state
On 2018-09-19 07:55:51 [+0200], Paolo Bonzini wrote:
> A kthread can do use_mm/unuse_mm.

indeed. The FPU struct for the kernel thread isn't valid / does not
contain the expected PKRU value. So loading the pkru value from the
struct FPU does not work as expected. We could set it to 0 for a kernel
thread so we don't end up with a random value.
If we want to get this usecase working then we would have to move pkru
value from FPU to mm_struct and consider it in use_mm(). Do we want

> Paolo


 \ /
  Last update: 2018-09-19 18:58    [W:0.093 / U:8.232 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site