Re: [PATCH 0/3] x86: Make 5-level paging support unconditional for x86-64

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To: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH 0/3] x86: Make 5-level paging support unconditional for x86-64
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Wed, 31 Jul 2024 13:40:00 +0200
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Shivank Garg <shivankg@xxxxxxx>, ardb@xxxxxxxxxx, bp@xxxxxxxxx, brijesh.singh@xxxxxxx, corbet@xxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, hpa@xxxxxxxxx, jan.kiszka@xxxxxxxxxxx, jgross@xxxxxxxx, kbingham@xxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, luto@xxxxxxxxxx, michael.roth@xxxxxxx, mingo@xxxxxxxxxx, rick.p.edgecombe@xxxxxxxxx, sandipan.das@xxxxxxx, thomas.lendacky@xxxxxxx, x86@xxxxxxxxxx
In-reply-to: <jczq52e6vrluqobqzejakdo3mdxqiqohdzbwmq64uikrm2h52n@l2bgf4ir7pj6>
References: <80734605-1926-4ac7-9c63-006fe3ea6b6a@amd.com> <87wml16hye.ffs@tglx> <jczq52e6vrluqobqzejakdo3mdxqiqohdzbwmq64uikrm2h52n@l2bgf4ir7pj6>

On Wed, Jul 31, 2024 at 02:36:47PM +0300, Kirill A. Shutemov wrote:
> The risk with your proposal is that 5-level paging will not get any
> testing and rot over time.
> 
> I would like to keep it on, if possible.

Well, if it is boot time, you just tell your CI to force enable 5level
and you're done, right? Then the rest of us use 4 and we all good.

References:
- Re: [PATCH 0/3] x86: Make 5-level paging support unconditional for x86-64
  - From: Shivank Garg
- Re: [PATCH 0/3] x86: Make 5-level paging support unconditional for x86-64
  - From: Thomas Gleixner
- Re: [PATCH 0/3] x86: Make 5-level paging support unconditional for x86-64
  - From: Kirill A. Shutemov

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