linux-kernel - Re: [PATCH v2 1/5] x86/speculation: Provide a debugfs file to dump SPEC

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Message-ID: <20230621074105.GE2046280@hirez.programming.kicks-ass.net>
Date:   Wed, 21 Jun 2023 09:41:05 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-pm@...r.kernel.org,
        Robin Jarry <rjarry@...hat.com>, Joe Mario <jmario@...hat.com>
Subject: Re: [PATCH v2 1/5] x86/speculation: Provide a debugfs file to dump
 SPEC_CTRL MSRs

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?