linux-kernel - Re: [PATCHv2 0/5] x86: Enumerate TME and PCONFIG, add MKTME_KEY

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Message-ID: <0f1e32ce-81a5-bfc8-d830-a97df5bbee8a@intel.com>
Date:   Wed, 7 Feb 2018 10:49:40 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 0/5] x86: Enumerate TME and PCONFIG, add MKTME_KEY_PROG
 helper

On 02/07/2018 04:59 AM, Kirill A. Shutemov wrote:
> The patchset does some ground work for MKTME enabling:
>   - Adds two new cpufeatures: TME and PCONFIG;
>   - Detects if BIOS enabled TME and MKTME;
>   - Enumerates what PCONFIG targets are supported;
>   - Provides helper to program encryption keys into CPU;
> 
> As part of TME enumeration we check of how many bits from physical address
> are claimed for encryption key ID. This may be critical as we or guest VM
> must not use these bits for physical address.

For this kind of stuff, I'd really appreciate if you included some
high-level descriptions.  I'd assume that a reviewer has no idea what
PCONFIG or MKTME is.

It would also be really nice to say which hardware will implement this.
Is it in particular CPUs today, for instance?