lkml.org 
[lkml]   [2012]   [Jul]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: perf with precise attribute kills all KVM based VMs
From
Date
On Mon, 2012-07-09 at 17:19 +0300, Gleb Natapov wrote:
> Yes, this is knows problem that I can't find time to fix. The crash is
> cause by CPU using host PEBS virtual address while guest is running
> which causes guest memory corruption. We should disable evens that use
> PEBS at the guest entry.

Whoops.. so the hardware is reading the DS address as programmed by the
host (host linear address) and using it as a guest linear address?

Quality stuff..

Disabling PEBS events for guests isn't pretty though.. but I guess the
only alternative is mapping the DS into the guest and reprogramming
MSR_IA32_DS_AREA which is all a little involved I suppose?


\
 
 \ /
  Last update: 2012-07-09 17:21    [W:2.266 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site