From: Alexander Potapenko <glider@google.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"the arch/x86 maintainers" <x86@kernel.org>,
Kostya Serebryany <kcc@google.com>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Taras Madan <tarasmadan@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
"H . J . Lu" <hjl.tools@gmail.com>,
Andi Kleen <ak@linux.intel.com>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Linux Memory Management List <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCHv5 00/13] Linear Address Masking enabling
Date: Mon, 18 Jul 2022 19:39:22 +0200 [thread overview]
Message-ID: <CAG_fn=WR3s3UMh76+bibN0nUpZk9AS_M18=oxP+pc_vtqKt34A@mail.gmail.com> (raw)
In-Reply-To: <20220712231328.5294-1-kirill.shutemov@linux.intel.com>
On Wed, Jul 13, 2022 at 1:13 AM Kirill A. Shutemov
<kirill.shutemov@linux.intel.com> wrote:
>
> Linear Address Masking[1] (LAM) modifies the checking that is applied to
> 64-bit linear addresses, allowing software to use of the untranslated
> address bits for metadata.
>
> The patchset brings support for LAM for userspace addresses.
>
> LAM_U48 enabling is controversial since it competes for bits with
> 5-level paging. Its enabling isolated into an optional last patch that
> can be applied at maintainer's discretion.
I believe having optional patches will put unnecessary burden on
distro maintainers.
Soon after landing U48 support other changes will start piling on top
of it, and it will be impossible to maintain a kernel with this patch
removed.
It also won't make any difference for the upstream, where this patch
will be always present.
We'd better decide now whether we need U48 or not, and either keep it
or delete it.
next prev parent reply other threads:[~2022-07-18 17:40 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-12 23:13 Kirill A. Shutemov
2022-07-12 23:13 ` [PATCHv5 01/13] x86/mm: Fix CR3_ADDR_MASK Kirill A. Shutemov
2022-07-21 13:10 ` Alexander Potapenko
2022-07-29 3:00 ` Hu, Robert
2022-07-12 23:13 ` [PATCHv5 02/13] x86: CPUID and CR3/CR4 flags for Linear Address Masking Kirill A. Shutemov
2022-07-21 13:10 ` Alexander Potapenko
2022-07-12 23:13 ` [PATCHv5 03/13] mm: Pass down mm_struct to untagged_addr() Kirill A. Shutemov
2022-07-21 13:12 ` Alexander Potapenko
2022-07-12 23:13 ` [PATCHv5 04/13] x86/mm: Handle LAM on context switch Kirill A. Shutemov
2022-07-12 23:13 ` [PATCHv5 05/13] x86/uaccess: Provide untagged_addr() and remove tags before address check Kirill A. Shutemov
2022-07-13 15:02 ` [PATCHv5.1 04/13] x86/mm: Handle LAM on context switch Kirill A. Shutemov
2022-07-20 8:57 ` Alexander Potapenko
2022-07-20 12:38 ` Kirill A. Shutemov
2022-07-21 13:13 ` Alexander Potapenko
2022-07-21 13:14 ` [PATCHv5 05/13] x86/uaccess: Provide untagged_addr() and remove tags before address check Alexander Potapenko
2022-07-12 23:13 ` [PATCHv5 06/13] x86/mm: Provide ARCH_GET_UNTAG_MASK and ARCH_ENABLE_TAGGED_ADDR Kirill A. Shutemov
2022-07-18 17:47 ` Alexander Potapenko
2022-07-20 0:57 ` Kirill A. Shutemov
2022-07-20 8:19 ` Alexander Potapenko
2022-07-20 12:47 ` Kirill A. Shutemov
2022-07-20 12:54 ` Alexander Potapenko
2022-07-12 23:13 ` [PATCHv5 07/13] x86: Expose untagging mask in /proc/$PID/arch_status Kirill A. Shutemov
2022-07-21 13:47 ` Alexander Potapenko
2022-07-12 23:13 ` [PATCHv5 08/13] selftests/x86/lam: Add malloc test cases for linear-address masking Kirill A. Shutemov
2022-07-12 23:13 ` [PATCHv5 09/13] selftests/x86/lam: Add mmap and SYSCALL " Kirill A. Shutemov
2022-07-12 23:13 ` [PATCHv5 10/13] selftests/x86/lam: Add io_uring " Kirill A. Shutemov
2022-07-12 23:13 ` [PATCHv5 11/13] selftests/x86/lam: Add inherit " Kirill A. Shutemov
2022-07-12 23:13 ` [PATCHv5 OPTIONAL 12/13] x86/mm: Extend LAM to support to LAM_U48 Kirill A. Shutemov
2022-07-12 23:13 ` [PATCHv5 OPTIONAL 13/13] selftests/x86/lam: Add tests cases for LAM_U48 Kirill A. Shutemov
2022-07-18 17:39 ` Alexander Potapenko [this message]
2022-07-20 0:59 ` [PATCHv5 00/13] Linear Address Masking enabling Kirill A. Shutemov
2022-07-21 13:09 ` Alexander Potapenko
2022-07-21 17:07 ` Dave Hansen
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