linux-kernel - Re: [PATCH 3/3] x86/mm: Move _PAGE_BIT

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Message-ID: <90047889-3b90-4c6a-90ed-f155c92f7ce1@intel.com>
Date: Thu, 23 Oct 2025 07:05:24 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Usama Arif <usamaarif642@...il.com>, dwmw@...zon.co.uk,
 tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, ardb@...nel.org, hpa@...or.com
Cc: x86@...nel.org, apopple@...dia.com, thuth@...hat.com,
 nik.borisov@...e.com, kas@...nel.org, linux-kernel@...r.kernel.org,
 linux-efi@...r.kernel.org, kernel-team@...a.com,
 Michael van der Westhuizen <rmikey@...a.com>, Tobias Fleig <tfleig@...a.com>
Subject: Re: [PATCH 3/3] x86/mm: Move _PAGE_BIT_NOPTISHADOW from bit 58 to bit
 9

On 10/22/25 16:58, Usama Arif wrote:
>> This isn't necessary once the previous 2 patches are applied, right?
> In kexec if the target kernels have patch 1 and 2, then this patch
> is not needed. Unfortunately, patches 1 and 2 are not livepatchable.
> Also backporting patches 1 and 2 to all previous kernels running in
> production in a large fleet is not very scalable.

I don't think I've ever been asked to apply a patch to make livepatching
easier. I'm not sure that's something we want to pollute mainline with.