From: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
To: Harry Yoo <harry.yoo@oracle.com>
Cc: Dennis Zhou <dennis@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
x86@kernel.org, Borislav Petkov <bp@alien8.de>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Tejun Heo <tj@kernel.org>,
Uladzislau Rezki <urezki@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Christoph Lameter <cl@gentwo.org>,
David Hildenbrand <david@redhat.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
"H. Peter Anvin" <hpa@zytor.com>,
kasan-dev@googlegroups.com, Mike Rapoport <rppt@kernel.org>,
Ard Biesheuvel <ardb@kernel.org>,
linux-kernel@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>,
Alexander Potapenko <glider@google.com>,
Vlastimil Babka <vbabka@suse.cz>,
Suren Baghdasaryan <surenb@google.com>,
Thomas Huth <thuth@redhat.com>,
John Hubbard <jhubbard@nvidia.com>,
Michal Hocko <mhocko@suse.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
linux-mm@kvack.org, "Kirill A. Shutemov" <kas@kernel.org>,
Oscar Salvador <osalvador@suse.de>,
Jane Chu <jane.chu@oracle.com>,
Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
Joerg Roedel <joro@8bytes.org>,
Alistair Popple <apopple@nvidia.com>,
Joao Martins <joao.m.martins@oracle.com>,
linux-arch@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH V4 mm-hotfixes 2/3] mm: introduce and use {pgd,p4d}_populate_kernel()
Date: Tue, 12 Aug 2025 17:08:29 +0100 [thread overview]
Message-ID: <ef82f65a-f443-4341-9ae3-5d4e5cc9cee1@lucifer.local> (raw)
In-Reply-To: <aJsPLRDhan9KvPmW@hyeyoo>
On Tue, Aug 12, 2025 at 06:53:49PM +0900, Harry Yoo wrote:
> > I'd add that arm handles PGTBL_PMD_MODIFIED and therefore remains unaffected
> > just to be super clear.
>
> Will do:
>
> This change currently targets only x86_64, so only PGD and P4D level
> helpers are introduced. Currently, these helpers are no-ops since no
> architecture sets PGTBL_{PGD,P4D}_MODIFIED in ARCH_PAGE_TABLE_SYNC_MASK.
>
> In theory, PUD and PMD level helpers can be added later if needed by
> other architectures. For now, 32-bit architectures (x86-32 and arm)
> only handle PGTBL_PMD_MODIFIED, so p*d_populate_kernel() will never
> affect them unless we introduce a PMD level helper.
Sounds good!
Cheers, Lorenzo
next prev parent reply other threads:[~2025-08-12 16:09 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-11 5:34 [PATCH V4 mm-hotfixes 0/3] mm, x86: fix crash due to missing page table sync and make it harder to miss Harry Yoo
2025-08-11 5:34 ` [PATCH V4 mm-hotfixes 1/3] mm: move page table sync declarations to linux/pgtable.h Harry Yoo
2025-08-11 8:05 ` Mike Rapoport
2025-08-11 8:36 ` Harry Yoo
2025-08-11 8:52 ` Mike Rapoport
2025-08-11 9:19 ` Uladzislau Rezki
2025-08-11 11:21 ` Lorenzo Stoakes
2025-08-11 5:34 ` [PATCH V4 mm-hotfixes 2/3] mm: introduce and use {pgd,p4d}_populate_kernel() Harry Yoo
2025-08-11 8:10 ` Mike Rapoport
2025-08-11 9:10 ` Lorenzo Stoakes
2025-08-11 10:36 ` Harry Yoo
2025-08-11 11:18 ` Lorenzo Stoakes
2025-08-11 11:38 ` Lorenzo Stoakes
2025-08-11 12:12 ` Harry Yoo
2025-08-11 12:18 ` Lorenzo Stoakes
2025-08-12 9:53 ` Harry Yoo
2025-08-12 16:08 ` Lorenzo Stoakes [this message]
2025-08-25 11:27 ` Christophe Leroy
2025-08-25 16:02 ` Harry Yoo
2025-08-11 5:34 ` [PATCH V4 mm-hotfixes 3/3] x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() Harry Yoo
2025-08-11 8:13 ` Mike Rapoport
2025-08-11 11:46 ` Lorenzo Stoakes
2025-08-12 8:59 ` Harry Yoo
2025-08-12 16:36 ` Lorenzo Stoakes
2025-08-11 6:46 ` [PATCH V4 mm-hotfixes 0/3] mm, x86: fix crash due to missing page table sync and make it harder to miss Kiryl Shutsemau
2025-08-11 8:09 ` Harry Yoo
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