From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from gentwo.org (gentwo.org [62.72.0.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 24D08214807; Wed, 5 Feb 2025 20:46:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.72.0.81 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738788387; cv=none; b=SwPflNqt3epv05Q9ASx2lR1I4Np3IK0MVoRnHPovqiYa4HQTdUG2KWKTc5U5YGd5L5dR9sUr2sxtUwkTmpjCibXY0oipPhrxljiI/Jr9nk7losB2uWNeQDH2U2M3Av8O8LouQl+q9O172Nu5oJuzRX+E3iIexWOkYK3HWzFPFbc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738788387; c=relaxed/simple; bh=33IQOomqEyLTQbaYoSoQ2PJ57XbkscwA0pHsfJIANsE=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References: MIME-Version:Content-Type; b=ezjJrrye52ahzJRlpeQzfqBp57zei4ufUPWZGUUvCk9ltXkeV3vpM1hTv+WEl4fS3l2QGHC/DtPlWV1B4QOISVUpG+o1ev4spRMkKfacq9mMgKglpoxjZY6tNe+zomjyoFDoK5XAt+ccC9PBfDrTSXYpEbirUEIHkB63ByHVGPw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=gentwo.org; spf=pass smtp.mailfrom=gentwo.org; dkim=pass (1024-bit key) header.d=gentwo.org header.i=@gentwo.org header.b=hAl/xLVS; arc=none smtp.client-ip=62.72.0.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=gentwo.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gentwo.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=gentwo.org header.i=@gentwo.org header.b="hAl/xLVS" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gentwo.org; s=default; t=1738781507; bh=33IQOomqEyLTQbaYoSoQ2PJ57XbkscwA0pHsfJIANsE=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=hAl/xLVS2r7Z4b6dKCNGQj1YxU7mBAFZLxa0QFxRcOfg9/MMOpCcpPaUILVgfMiCD 2Xzh/SDNcO2OkjjW/9VtrMp95w0TNdf6eYPrtPnCGFvHDmq2AGyBc7FSCpF2aiSDIy PXbvCiMuZZA0WsQlqrDQ4EI9w2tceEb6ut8EvkwE= Received: by gentwo.org (Postfix, from userid 1003) id 6887F401F1; Wed, 5 Feb 2025 10:51:47 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by gentwo.org (Postfix) with ESMTP id 6476D401E1; Wed, 5 Feb 2025 10:51:47 -0800 (PST) Date: Wed, 5 Feb 2025 10:51:47 -0800 (PST) From: "Christoph Lameter (Ampere)" To: Jessica Clarke cc: Maciej Wieczor-Retman , 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 In-Reply-To: Message-ID: <72837fcd-97a8-c213-0098-c8f308c3415d@gentwo.org> References: <8bd9c793-aac6-a330-ea8f-3bde0230a20b@gentwo.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="8323329-1508829946-1738781507=:2407083" This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --8323329-1508829946-1738781507=:2407083 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT 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. --8323329-1508829946-1738781507=:2407083--