Re: [PATCH v2 1/5] x86/speculation: Provide a debugfs file to dump SPEC_CTRL MSRs

[Borislav Petkov]

On Wed, Jun 21, 2023 at 09:41:05AM +0200, Peter Zijlstra wrote:
> On Tue, Jun 20, 2023 at 10:06:21AM -0400, Waiman Long wrote:
> > Sometimes it is useful to know the states the SPEC_CTRL MSRs to see what
> > mitigations are enabled at run time. Provide a new x86/spec_ctrl_msrs
> > debugfs file to dump the cached versions of the current SPEC_CTRL MSRs.
> > 
> 
> Pff, clearly I can't even read email anymore..
> 
> We don't do this for any of the other MSRs, so why start now?

Hell no.

There's /sys/devices/system/cpu/vulnerabilities/ for that.

We are abstracting MSRs away from APIs - not do the backwards thing.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette