Re: [PATCH v5 2/2] x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation

From: Jiri Kosina
Date: Mon Sep 10 2018 - 07:46:22 EST

On Mon, 10 Sep 2018, Jiri Kosina wrote:

> > That looks much more palatable. One missing piece is the sysfs
> > mitigation file for spectre v2. That should reflect STIPB state as well.
> FWIW, we're missing a bit more in that area, namely RSB stuffing on
> context switch, IBRS (even through only around fw) and IBPB; those are
> only signalled in dmesg during bootup.

Nah, IBPB is actuall there, sorry. So I'll add reporting of STIBP + fixup
the missing reporting of RSB_CTXSW for v6.

Jiri Kosina