lkml.org 
[lkml]   [2016]   [Mar]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: runtime regression with "x86/mm/pat: Emulate PAT when it is disabled"
On Fri, Mar 11, 2016 at 11:29:54PM +0000, Richard Purdie wrote:
> ... and if I remember rightly, the CPU features the kvm* options
> provide vary quite widely and wasn't consistent.

How so? Please elaborate so that we can fix those.

Btw, your reproducer works fine with -cpu kvm32 - only vncviewer's
window gets killed after a "Rect too large: 640x480 at (0, 0)" but
when I reconnect again right after it I see an X window asking me to
calibrate my touch screen and I'm at a loss as to where my touch screen
is... :-P

> Tweaking the kernel to only enable PAT with MTRR sounds like a good
> fix,

Yeah, the idea is to basically switch to uncacheable memtype as when
MTRRs are disabled.

--
Regards/Gruss,
Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--

\
 
 \ /
  Last update: 2016-03-12 13:41    [W:0.096 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site