From: Linus Torvalds <torvalds@linux-foundation.org>
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>,
x86@kernel.org, Kostya Serebryany <kcc@google.com>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Alexander Potapenko <glider@google.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>,
Bharata B Rao <bharata@amd.com>,
Jacob Pan <jacob.jun.pan@linux.intel.com>,
Ashok Raj <ashok.raj@intel.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCHv15 00/17] Linear Address Masking enabling
Date: Mon, 23 Jan 2023 18:07:20 -0800 [thread overview]
Message-ID: <CAHk-=wjJ2-ReHbDfLwjTVY=Sx=cFq+zNzp80ALQOb=V1+y0taQ@mail.gmail.com> (raw)
In-Reply-To: <20230123220500.21077-1-kirill.shutemov@linux.intel.com>
On Mon, Jan 23, 2023 at 2:05 PM 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 capability can be used for efficient address sanitizers (ASAN)
> implementation and for optimizations in JITs and virtual machines.
>
> The patchset brings support for LAM for userspace addresses. Only LAM_U57 at
> this time.
I didn't react to anything objectionable in the series.
My only reaction was actually to ask "when / what CPU cores are
expected to support this feature"?
Maybe it was mentioned somewhere, and I'm just blind and not finding
it. But even the "Instruction Set Extensions and Future Features"
paper seems to just be talking about the CPUID bits, not about any
actual "this is when we expect it".
(But again, I only scanned it, so maybe it's there and I just missed it).
Linus
next prev parent reply other threads:[~2023-01-24 2:07 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-23 22:04 [PATCHv15 00/17] Linear Address Masking enabling Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 01/17] x86/mm: Rework address range check in get_user() and put_user() Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 02/17] x86: Allow atomic MM_CONTEXT flags setting Kirill A. Shutemov
2023-02-09 14:06 ` Alexander Potapenko
2023-01-23 22:04 ` [PATCHv15 03/17] x86: CPUID and CR3/CR4 flags for Linear Address Masking Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 04/17] x86/mm: Handle LAM on context switch Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 05/17] mm: Introduce untagged_addr_remote() Kirill A. Shutemov
2023-02-09 14:08 ` Alexander Potapenko
2023-01-23 22:04 ` [PATCHv15 06/17] x86/uaccess: Provide untagged_addr() and remove tags before address check Kirill A. Shutemov
2023-02-09 14:10 ` Alexander Potapenko
2023-02-10 15:18 ` Alexander Potapenko
2023-01-23 22:04 ` [PATCHv15 07/17] x86/mm: Reduce untagged_addr() overhead for systems without LAM Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 08/17] x86/mm: Provide arch_prctl() interface for LAM Kirill A. Shutemov
2023-02-09 14:12 ` Alexander Potapenko
2023-01-23 22:04 ` [PATCHv15 09/17] mm: Expose untagging mask in /proc/$PID/status Kirill A. Shutemov
2023-02-09 14:13 ` Alexander Potapenko
2023-02-10 12:29 ` Alexander Potapenko
2023-01-23 22:04 ` [PATCHv15 10/17] iommu/sva: Replace pasid_valid() helper with mm_valid_pasid() Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 11/17] x86/mm/iommu/sva: Make LAM and SVA mutually exclusive Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 12/17] selftests/x86/lam: Add malloc and tag-bits test cases for linear-address masking Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 13/17] selftests/x86/lam: Add mmap and SYSCALL " Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 14/17] selftests/x86/lam: Add io_uring " Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 15/17] selftests/x86/lam: Add inherit " Kirill A. Shutemov
2023-01-23 22:04 ` [PATCHv15 16/17] selftests/x86/lam: Add ARCH_FORCE_TAGGED_SVA " Kirill A. Shutemov
2023-01-23 22:05 ` [PATCHv15 17/17] selftests/x86/lam: Add test cases for LAM vs thread creation Kirill A. Shutemov
2023-01-24 2:07 ` Linus Torvalds [this message]
2023-01-24 11:01 ` [PATCHv15 00/17] Linear Address Masking enabling Kirill A. Shutemov
2023-01-26 14:42 ` Kirill A. Shutemov
2023-01-26 18:31 ` Linus Torvalds
2023-03-13 3:23 ` Binbin Wu
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