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

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Message-ID: <5484e005-3b3d-a53a-f18e-d9b6620cf84b@intel.com>
Date:   Fri, 19 Jun 2020 13:24:23 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Andy Lutomirski <luto@...nel.org>,
        Richard Hughes <hughsient@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Borislav Petkov <bp@...en8.de>,
        Daniel Gutson <daniel@...ypsium.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        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 6/19/20 1:20 PM, Andy Lutomirski wrote:
> Boris, etc: would it be reasonable to add a list of CPU features that
> are present but turned off by firmware?  SME is far from the only
> thing that's frequently in this category.  x2apic, fast strings, and
> virtualization come to mind.

Sounds sane to me.  I like the idea of proving ammo to end users to
either go flip a BIOS switch, or yell at their firmware vendor.