[lkml]   [2018]   [Sep]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v5 2/2] x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation
On Tue, 11 Sep 2018, Thomas Gleixner wrote:

> On Tue, 11 Sep 2018, Tim Chen wrote:
> > On 09/10/2018 04:46 AM, Jiri Kosina wrote:
> > > Nah, IBPB is actuall there, sorry. So I'll add reporting of STIBP + fixup
> > > the missing reporting of RSB_CTXSW for v6.
> > >
> >
> > I anticipate that STIBP could affect workloads with a lot of indirect
> > branches (see previous discussion with Andrea). We should have a
> > knob for people to opt in or opt out of STIBP.
> Feel free to send a patch to that effect.

Along with a proper explanation why it makes sense to disable this
particular piece separate from the rest of the V2 mitigations. You surely
can come up with a rationale based on facts rather than on anticipations.



 \ /
  Last update: 2018-09-11 23:47    [W:0.147 / U:19.852 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site