From: "Christoph Lameter (Ampere)" <cl@gentwo.org>
To: Jessica Clarke <jrtc27@jrtc27.com>
Cc: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>,
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: Wed, 5 Feb 2025 10:51:47 -0800 (PST) [thread overview]
Message-ID: <72837fcd-97a8-c213-0098-c8f308c3415d@gentwo.org> (raw)
In-Reply-To: <F974BA79-80D8-4414-9DFD-1EEF9395143C@jrtc27.com>
[-- Attachment #1: Type: text/plain, Size: 379 bytes --]
On Tue, 4 Feb 2025, Jessica Clarke wrote:
> It’s not “no performance penalty”, there is a cost to tracking the MTE
> tags for checking. In asynchronous (or asymmetric) mode that’s not too
On Ampere Processor hardware there is no penalty since the logic is build
into the usual read/write paths. This is by design. There may be on other
platforms that cannot do this.
next prev parent reply other threads:[~2025-02-05 20:46 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
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) [this message]
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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