linux-kernel - Re: [PATCH V8 02/44] Documentation/protection-keys: Clean up documentation for User Space pkeys

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Message-ID: <21762a91-ce69-540a-6209-537aad5ae7b7@intel.com>
Date:   Tue, 1 Feb 2022 15:54:19 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V8 02/44] Documentation/protection-keys: Clean up
 documentation for User Space pkeys

On 2/1/22 15:49, Ira Weiny wrote:
>> Protection Keys for Userspace (PKU) can be found on:
>>  * Intel server CPUs, Skylake and later
>>  * Intel client CPUs, Tiger Lake (11th Gen Core) and later
>>  * Future AMD CPUs
>>
>> It would be great if the AMD folks can elaborate on that a bit, but I
>> understand it might not be possible if the CPUs aren't out yet.
> Updated.
> 
> But I'm leery about putting in any information about AMD CPU's.  Who could I
> ask directly?

I forgot who from AMD was chiming in on pkeys.  So, I did:

	git log --author=amd.com arch/x86/

and searched for 'keys'.  I came up with this pretty quickly:

> commit 38f3e775e9c242f5430a9c08c11be7577f63a41c
> Author: Babu Moger <babu.moger@....com>
> Date:   Thu May 28 11:08:23 2020 -0500
> 
>     x86/Kconfig: Update config and kernel doc for MPK feature on AMD
>     
>     AMD's next generation of EPYC processors support the MPK (Memory
>     Protection Keys) feature. Update the dependency and documentation.
>     
>     Signed-off-by: Babu Moger <babu.moger@....com>
>     Signed-off-by: Borislav Petkov <bp@...e.de>
>     Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com>
>     Link: https://lkml.kernel.org/r/159068199556.26992.17733929401377275140.stgit@naples-babu.amd.com
You also don't have to go out and find this information for your
documentation.  Just say "future" and then poke the AMD folks.