From: Dave Hansen <dave.hansen@intel.com>
To: "Christoph Lameter (Ampere)" <cl@gentwo.org>,
Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Cc: luto@kernel.org, xin@zytor.com, kirill.shutemov@linux.intel.com,
palmer@dabbelt.com, tj@kernel.org, andreyknvl@gmail.com,
brgerst@gmail.com, ardb@kernel.org, dave.hansen@linux.intel.com,
jgross@suse.com, will@kernel.org, akpm@linux-foundation.org,
arnd@arndb.de, corbet@lwn.net, dvyukov@google.com,
richard.weiyang@gmail.com, ytcoode@gmail.com, tglx@linutronix.de,
hpa@zytor.com, seanjc@google.com, paul.walmsley@sifive.com,
aou@eecs.berkeley.edu, justinstitt@google.com,
jason.andryuk@amd.com, glider@google.com, ubizjak@gmail.com,
jannh@google.com, bhe@redhat.com, vincenzo.frascino@arm.com,
rafael.j.wysocki@intel.com, ndesaulniers@google.com,
mingo@redhat.com, catalin.marinas@arm.com,
junichi.nomura@nec.com, nathan@kernel.org,
ryabinin.a.a@gmail.com, dennis@kernel.org, bp@alien8.de,
kevinloughlin@google.com, morbo@google.com,
dan.j.williams@intel.com, julian.stecklina@cyberus-technology.de,
peterz@infradead.org, kees@kernel.org,
kasan-dev@googlegroups.com, x86@kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, llvm@lists.linux.dev,
linux-doc@vger.kernel.org
Subject: Re: [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode for x86
Date: Tue, 4 Feb 2025 13:05:18 -0800 [thread overview]
Message-ID: <fb30574a-d238-424c-a464-0f7a5707c46a@intel.com> (raw)
In-Reply-To: <8bd9c793-aac6-a330-ea8f-3bde0230a20b@gentwo.org>
On 2/4/25 10:58, Christoph Lameter (Ampere) wrote:
> ARM64 supports MTE which is hardware support for tagging 16 byte granules
> and verification of tags in pointers all in hardware and on some platforms
> with *no* performance penalty since the tag is stored in the ECC areas of
> DRAM and verified at the same time as the ECC.
>
> Could we get support for that? This would allow us to enable tag checking
> in production systems without performance penalty and no memory overhead.
At least on the Intel side, there's no trajectory for doing something
like the MTE architecture for memory tagging. The DRAM "ECC" area is in
very high demand and if anything things are moving away from using ECC
"bits" for anything other than actual ECC. Even the MKTME+integrity
(used for TDX) metadata is probably going to find a new home at some point.
This shouldn't be a surprise to anyone on cc here. If it is, you should
probably be reaching out to Intel over your normal channels.
next prev parent reply other threads:[~2025-02-04 21:05 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-04 17:33 Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 01/15] kasan: Allocation enhancement for dense tag-based mode Maciej Wieczor-Retman
2025-02-05 23:43 ` Andrey Konovalov
2025-02-06 12:57 ` Maciej Wieczor-Retman
2025-02-06 18:14 ` Andrey Konovalov
2025-02-04 17:33 ` [PATCH 02/15] kasan: Tag checking with " Maciej Wieczor-Retman
2025-02-05 23:45 ` Andrey Konovalov
2025-02-06 14:55 ` Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 03/15] kasan: Vmalloc dense tag-based mode support Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 04/15] kasan: arm64: x86: risc-v: Make special tags arch specific Maciej Wieczor-Retman
2025-02-05 20:20 ` Palmer Dabbelt
2025-02-06 11:22 ` Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 05/15] x86: Add arch specific kasan functions Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 06/15] x86: Reset tag for virtual to physical address conversions Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 07/15] mm: Pcpu chunk address tag reset Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 08/15] x86: Physical address comparisons in fill_p*d/pte Maciej Wieczor-Retman
2025-02-06 0:57 ` Dave Hansen
2025-02-07 16:37 ` Maciej Wieczor-Retman
2025-02-11 19:59 ` Dave Hansen
2025-02-04 17:33 ` [PATCH 09/15] x86: Physical address comparison in current_mm pgd check Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 10/15] x86: KASAN raw shadow memory PTE init Maciej Wieczor-Retman
2025-02-05 23:45 ` Andrey Konovalov
2025-02-06 15:39 ` Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 11/15] x86: LAM initialization Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 12/15] x86: Minimal SLAB alignment Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 13/15] x86: runtime_const used for KASAN_SHADOW_END Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 14/15] x86: Make software tag-based kasan available Maciej Wieczor-Retman
2025-02-04 17:33 ` [PATCH 15/15] kasan: Add mititgation and debug modes Maciej Wieczor-Retman
2025-02-05 23:46 ` Andrey Konovalov
2025-02-07 9:08 ` Maciej Wieczor-Retman
2025-02-04 18:58 ` [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode for x86 Christoph Lameter (Ampere)
2025-02-04 21:05 ` Dave Hansen [this message]
2025-02-05 18:59 ` Christoph Lameter (Ampere)
2025-02-05 23:04 ` Ard Biesheuvel
2025-02-04 23:36 ` Jessica Clarke
2025-02-05 18:51 ` Christoph Lameter (Ampere)
2025-02-06 1:05 ` Jessica Clarke
2025-02-06 19:11 ` Christoph Lameter (Ampere)
2025-02-06 21:41 ` Dave Hansen
2025-02-07 7:41 ` Maciej Wieczor-Retman
2025-02-06 22:56 ` Andrey Konovalov
2025-02-04 23:36 ` Jessica Clarke
2025-02-05 23:40 ` Andrey Konovalov
2025-02-06 10:40 ` Maciej Wieczor-Retman
2025-02-06 18:10 ` Andrey Konovalov
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