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

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Message-ID: <CAD2FfiFt0zm1uk6Z8RF_EUFeEd8ZT61B9+jtdAHrF5hOrcTk_w@mail.gmail.com>
Date:   Fri, 19 Jun 2020 17:31:27 +0100
From:   Richard Hughes <hughsient@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Daniel Gutson <daniel@...ypsium.com>,
        Dave Hansen <dave.hansen@...el.com>,
        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 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Ability to read the MKTME status from userspace

On Fri, 19 Jun 2020 at 17:17, Borislav Petkov <bp@...en8.de> wrote:
> Well, I believe all the kernel can do is supply bits of information -
> just like MSRs - and depending on the settings of those bits, userspace
> can decide what the situation is. For example:
> bit 0 - CPUID support
> bit 1 - BIOS enabled

Yes, something like this would be entirely fine for my purpose -- I
don't mind where or how I get the data out of the kernel, but parsing
the entire systemd journal for a magic string is something I really
want to avoid.

Richard.