lkml.org 
[lkml]   [2009]   [Aug]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [boot crash] Re: [tip:x86/mce3] x86, mce: use 64bit machine check code on 32bit
Hidetoshi Seto wrote:
> One possibility is: if the BIOS doesn't clear status in banks,
> new mce codes will try to log such junks.
> If the junk is totally junk but can be decoded as a valid log with
> MISCV or ADDRV bit, and if the cpu try to access register which is
> not implemented (e.g. IA32_MCi_MISC/ADDR), then such access might
> cause a general protection exception. (ref. ASDM 3A 15.3.2.3)

The MCA declares if it comes with ADDR or MISC in a status bit
and the MCA code only accesses these MSRs if these status bits are set.
Also I believe P3 implemented ADDR at least, likely even MISC.

The old 32bit MCA code did that too

-Andi


\
 
 \ /
  Last update: 2009-08-17 12:59    [W:0.101 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site