Re: [patch 1/2] x86,module: Detect VMX modules and disable Split-Lock-Detect

[Rasmus Villemoes]

On 02/04/2020 14.32, Thomas Gleixner wrote:
> From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> 
> It turns out that with Split-Lock-Detect enabled (default) any VMX
> hypervisor needs at least a little modification in order to not blindly
> inject the #AC into the guest without the guest being ready for it.
> 
> Since there is no telling which module implements a hypervisor, scan the
> module text and look for the VMLAUNCH instruction. If found, the module is
> assumed to be a hypervisor of some sort and SLD is disabled.

How long does that scan take/add to module load time? Would it make
sense to exempt in-tree modules?

Rasmus