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From:   Richard Hughes <hughsient@gmail.com>
Date:   Fri, 19 Jun 2020 17:31:27 +0100
Message-ID: <CAD2FfiFt0zm1uk6Z8RF_EUFeEd8ZT61B9+jtdAHrF5hOrcTk_w@mail.gmail.com>
Subject: Re: [PATCH] Ability to read the MKTME status from userspace
To:     Borislav Petkov <bp@alien8.de>
Cc:     Andy Lutomirski <luto@amacapital.net>,
        Daniel Gutson <daniel@eclypsium.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        "David S. Miller" <davem@davemloft.net>,
        Rob Herring <robh@kernel.org>, Tony Luck <tony.luck@intel.com>,
        Rahul Tanwar <rahul.tanwar@linux.intel.com>,
        Xiaoyao Li <xiaoyao.li@intel.com>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        linux-kernel <linux-kernel@vger.kernel.org>
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On Fri, 19 Jun 2020 at 17:17, Borislav Petkov <bp@alien8.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.