linux-kernel - Re: [PATCH] Ability to read the MKTME status from userspace

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Message-ID: <20200618220139.GH27951@zn.tnic>
Date:   Fri, 19 Jun 2020 00:01:39 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Daniel Gutson <daniel@...ypsium.com>,
        Dave Hansen <dave.hansen@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>, Tony Luck <tony.luck@...el.com>,
        Rahul Tanwar <rahul.tanwar@...ux.intel.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, Richard Hughes <hughsient@...il.com>
Subject: Re: [PATCH] Ability to read the MKTME status from userspace

On Thu, Jun 18, 2020 at 06:26:25PM -0300, Daniel Gutson wrote:
> Red Hat and Eclypsium are working on a specification to assess
> firmware platform security. One of the inputs that the specification
> takes into consideration is whether MKTME is enabled or disabled.
> Exposing this value is necessary for tools checking the conformance of
> the specification.

Would it be enough to grep /proc/cpuinfo whether it has "tme" or not,
instead of adding a bunch of code just to read a status value?

@Dave: this is where those flags in /proc/cpuinfo come real handy. :-)

-- 
Regards/Gruss,
    Boris.

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