linux-kernel - Re: [RFC V1 PATCH mm-hotfixes 0/3] mm, arch: A more robust approach to sync top level kernel page tables

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Message-ID: <aG5toshwZecWw8ZI@hyeyoo>
Date: Wed, 9 Jul 2025 22:24:50 +0900
From: Harry Yoo <harry.yoo@...cle.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...two.org>
Cc: "H . Peter Anvin" <hpa@...or.com>, Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Juergen Gross <jgross@...e.com>, Kevin Brodsky <kevin.brodsky@....com>,
        Muchun Song <muchun.song@...ux.dev>,
        Oscar Salvador <osalvador@...e.de>,
        Joao Martins <joao.m.martins@...cle.com>,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        Jane Chu <jane.chu@...cle.com>, Alistair Popple <apopple@...dia.com>,
        Mike Rapoport <rppt@...nel.org>,
        Gwan-gyeong Mun <gwan-gyeong.mun@...el.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [RFC V1 PATCH mm-hotfixes 0/3] mm, arch: A more robust approach
 to sync top level kernel page tables

On Wed, Jul 09, 2025 at 10:16:54PM +0900, Harry Yoo wrote:
> Harry Yoo (3):
>   mm: introduce and use {pgd,p4d}_populate_kernel()
>   x86/mm: define p*d_populate_kernel() and top level page table sync
>   x86/mm: convert {pgd,p4d}_populate{,_init} to _kernel variant
> 
>  arch/x86/include/asm/pgalloc.h |  41 +++++++++
>  arch/x86/mm/init_64.c          | 147 ++++++++++++++++-----------------
>  arch/x86/mm/kasan_init_64.c    |   8 +-
>  include/asm-generic/pgalloc.h  |   4 +
>  include/linux/pgalloc.h        |   0

Oops, while I created include/linux/pgalloc.h at first, I removed it
during the development and didn't realize it's still staged in git.

Will fix it in the next version, but let me wait for some feedback
for a while.

>  mm/kasan/init.c                |  10 +--
>  mm/percpu.c                    |   4 +-
>  mm/sparse-vmemmap.c            |   4 +-
>  8 files changed, 130 insertions(+), 88 deletions(-)
>  create mode 100644 include/linux/pgalloc.h
> 
> -- 
> 2.43.0
> 

-- 
Cheers,
Harry / Hyeonggon