lkml.org 
[lkml]   [2018]   [Feb]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [tip:x86/pti] x86/speculation: Use IBRS if available before calling into firmware
From
Date
On Mon, 2018-02-19 at 10:20 +0100, Peter Zijlstra wrote:
>
> I did not update or otherwise change packages while I was bisecting; the
> machine is:
>
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 62
> model name      : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
> stepping        : 4
> microcode       : 0x428

That's IVX with a microcode that doesn't *have* IBRS/IBPB. I don't
think there's a publicly available microcode that does; I assume you
didn't have one and build it into your kernel for early loading, and
thus you really weren't even using IBRS here? The code never even gets
patched in?[unhandled content-type:application/x-pkcs7-signature]
\
 
 \ /
  Last update: 2018-02-19 10:30    [W:0.350 / U:0.648 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site