From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 710DECCF9E3 for ; Tue, 11 Nov 2025 09:01:41 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B59B18E0016; Tue, 11 Nov 2025 04:01:40 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B314C8E0002; Tue, 11 Nov 2025 04:01:40 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A47238E0016; Tue, 11 Nov 2025 04:01:40 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 966EF8E0002 for ; Tue, 11 Nov 2025 04:01:40 -0500 (EST) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 41E144C0A0 for ; Tue, 11 Nov 2025 09:01:40 +0000 (UTC) X-FDA: 84097733160.11.2428D03 Received: from mail-qk1-f174.google.com (mail-qk1-f174.google.com [209.85.222.174]) by imf14.hostedemail.com (Postfix) with ESMTP id 61AE4100012 for ; Tue, 11 Nov 2025 09:01:38 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=ekxp3x5O; spf=pass (imf14.hostedemail.com: domain of glider@google.com designates 209.85.222.174 as permitted sender) smtp.mailfrom=glider@google.com; dmarc=pass (policy=reject) header.from=google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1762851698; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=s3GiAAjmzQ/VspCqloDpIt+ugCtvSToogOEL/VpV0Ws=; b=gnx7Os/lH1ksEjRIh6UV6y6chHPuCl+BrSi/itLpSYJj4KCQi25uVfN+sehlJQ9YK5q2JD /ZG0cd2N9Xx4emFGDa4OFyFYbGTBxz2NDcTjNRonVYdCPIPJpBHmtZs/x26kleI7ZuY9zM vASD0ux2fKO7nWdNNCBGczj6yIEfUKY= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=ekxp3x5O; spf=pass (imf14.hostedemail.com: domain of glider@google.com designates 209.85.222.174 as permitted sender) smtp.mailfrom=glider@google.com; dmarc=pass (policy=reject) header.from=google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1762851698; a=rsa-sha256; cv=none; b=zHqTV/rhD1hGYhWF5/Qvj34J4gSG6LdjaiqfgNsYErdIJzw3A5d/9HsXU1rvF74oHfjHP5 BU98go/MmcFzAFnehTd9XsMDFni1Kx3JwmO3UfwZbEr6NYQUa7NzdNxaJZ8DOZmcbK6bO6 CwWQi5VCuzPugVtpe8/pdVtJF/MmFno= Received: by mail-qk1-f174.google.com with SMTP id af79cd13be357-8b272a4ca78so308360985a.1 for ; Tue, 11 Nov 2025 01:01:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1762851697; x=1763456497; darn=kvack.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=s3GiAAjmzQ/VspCqloDpIt+ugCtvSToogOEL/VpV0Ws=; b=ekxp3x5OzTA8aOoPtYGtXXRucGZuAN0JzaZttM9u6aCLheoGR7xRck+iKP8VsD6fCE GC/UAtzUfO9EyraMuLOJWezwvNQQfKZraHq997p7IBokwhtAH6X7T6VVFAUESweZZ3HW iD4RbX+HrgW9el/xIGd7upX5Q7IEvake3tNUDZcplyWH271ns8zVy84J7ncmYF6lcwng HgiF+/3YzJ1yOfjVe4Evv7wzexe1vSoyT88m7ExwSNpsHD+EwbBUtJeC+h60xPMseAN5 VaDEpNS+vZdOB/Quu/dt0OQgbJVuh3eNrWe4e5sS31DnGAHopKfPeXSzKSmWUA30jHHd F4Bg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762851697; x=1763456497; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=s3GiAAjmzQ/VspCqloDpIt+ugCtvSToogOEL/VpV0Ws=; b=ixERqRSCo77+Jb3DmDBaZNIeui196/UevcR0kK/G6Nw5TXML8I6BSA9AaSj/qfReWV XQrc9AfZvBBX9iRLawwnvG8Q0cHA/ufe2rmnkwyVgT7V3Xiqgd4VQeDPpTm4GVg5PmfS IYE2YetVbtn+J7izNWSFIXIR5J/Zl0uPmvxWeTucrShr6Rc9myH8v4f1Zm1ificjcho5 Ly1dVr+elLrlHlTOOgyBqU5XC1UfPaU5EbwIbuMjSU+RuvzT0WB0bxQgstxOfUaB+f25 bWcBmve6qTzdiwSK6A2m2B+VNWuG3r++AxtCiTQTiNR/APB8HqP4lp1jNcc9WhwWu0tx cHMQ== X-Forwarded-Encrypted: i=1; AJvYcCWhBGXdINoVhEzCfpUNVU/a+nNeAbS/z8O1Gko3DHW6ZYvZe5gztnTaZLSzGsnjyx906n2n8/q9IQ==@kvack.org X-Gm-Message-State: AOJu0YwOa0jR04aHN6sP510X95J3KlYEv/jTLThylFKmE53XT3WT3h+G kKKcPKOf2821cmDnBq/9IIuxMqVPoQ9JrlpWYuqKf2TMiBEA8UIBZCWgFy8ZUS7/apokTTrQy8P LPlZ2gywvk1mKjfQjsmBErjP93GiQzzejvZUMlx5z X-Gm-Gg: ASbGnct6pxjJ4ntYlVM1pWSWIHc9fHwvMkdVavdV7wb5uExeYcVda+hqN59lGaxnt+o DB5fI/6a/VGYz8mg377wmUHvy5yrauvnaQ+g4y8Fa8NudvhhyZtnsLPsf6aGy0rctJe+UdifJ5v o9P55P8oprPcXhGEZ0yosIvw7sogf3qyYP8O+ZUENIQWZQNbhATgi3Gi4qKnE2QOxjO/51W6iUH XWaVAOrZEcnJiZ1QC0/EBKrepikROgBi4hDVbI03A/vkp6UZjYuitG1A5zclsjX6PmmPzjZ/spP 3dmnn+6Fe2swWesbdcE8eV+BLfBSWMtLonKB X-Google-Smtp-Source: AGHT+IHmbNWz4nrBYzIA6dULAnEplmbnkhIWWkrftwGIkZuDmlgOtFs93CqEkgKXIfWxtOJB7Fa7kj8HnLkgxuZShy0= X-Received: by 2002:ad4:5f07:0:b0:880:42a7:7730 with SMTP id 6a1803df08f44-88238731aaamr156015206d6.53.1762851696507; Tue, 11 Nov 2025 01:01:36 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Alexander Potapenko Date: Tue, 11 Nov 2025 10:00:59 +0100 X-Gm-Features: AWmQ_bku8cq-CFmbh2Cbwbizm47o3PsCv7pQitKRdKmveqfrADnJlpnymR3GFhA Message-ID: Subject: Re: [PATCH v6 18/18] x86/kasan: Make software tag-based kasan available To: Maciej Wieczor-Retman Cc: xin@zytor.com, peterz@infradead.org, kaleshsingh@google.com, kbingham@kernel.org, akpm@linux-foundation.org, nathan@kernel.org, ryabinin.a.a@gmail.com, dave.hansen@linux.intel.com, bp@alien8.de, morbo@google.com, jeremy.linton@arm.com, smostafa@google.com, kees@kernel.org, baohua@kernel.org, vbabka@suse.cz, justinstitt@google.com, wangkefeng.wang@huawei.com, leitao@debian.org, jan.kiszka@siemens.com, fujita.tomonori@gmail.com, hpa@zytor.com, urezki@gmail.com, ubizjak@gmail.com, ada.coupriediaz@arm.com, nick.desaulniers+lkml@gmail.com, ojeda@kernel.org, brgerst@gmail.com, elver@google.com, pankaj.gupta@amd.com, mark.rutland@arm.com, trintaeoitogc@gmail.com, jpoimboe@kernel.org, thuth@redhat.com, pasha.tatashin@soleen.com, dvyukov@google.com, jhubbard@nvidia.com, catalin.marinas@arm.com, yeoreum.yun@arm.com, mhocko@suse.com, lorenzo.stoakes@oracle.com, samuel.holland@sifive.com, vincenzo.frascino@arm.com, bigeasy@linutronix.de, surenb@google.com, ardb@kernel.org, Liam.Howlett@oracle.com, nicolas.schier@linux.dev, ziy@nvidia.com, kas@kernel.org, tglx@linutronix.de, mingo@redhat.com, broonie@kernel.org, corbet@lwn.net, andreyknvl@gmail.com, maciej.wieczor-retman@intel.com, david@redhat.com, maz@kernel.org, rppt@kernel.org, will@kernel.org, luto@kernel.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, linux-kbuild@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, linux-doc@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 61AE4100012 X-Stat-Signature: xnjne8qrntbc4rpgdzjncf4gjhbeaju9 X-Rspam-User: X-HE-Tag: 1762851698-357124 X-HE-Meta: U2FsdGVkX19X84zW4B4lSGCUCt2kpWRx3smOC7M4hs0QTTWrNKpSgaEAk18F41y/X1YOECp+sqFreLNGoA0bH7e+UNGDjccJ9Shj6uWsVXNVsGUopbelN/AMjmsReYErZ5Q5dw6lhmUaxGsIi0PHPuQjPPZycNRuiwqmhmPQsC/NutTwRhH5dcRX6uDpE/qOry0yq79h9I6Wxps5oOUUTzndnYAMfC7YwzSZ9wkEdYymP3jI4m6GF2NVhY24xXjtXbTZom+Ce/hPKgr4oI1RyP7NCQwzFNMHjOp+HlIsGWOCiM7sDTKPHJ5TRPUChF3qputzuO7bodXESec4fJJckEG4TJz3n+BdClAfJl8hqxZl/L+1/eXiqLkdPoCaxL6PLmMR0M1N7WBg6IAlgK7f4oQ9m7vfv+DAxafS95AZ1swHAkR8xHhsREeQrtUg4q3m7hTh+m4+lAoD0VokbPyu44Qi1x4UPMYAwg/mG8qD96o0BNCVXhfn/momtitXGGeyflYYpbuzF9wBLmraIwF1O8RPa54pDOKG6w/uGN9uwSG44fKzttWTgBDV5l7hhP/2N6XiPOdejLO+LJcOOgQDsZxGiqypvrTgx5WmSBGpXXDEHLx+sImnxia2nUr6sbZypo4xX7D3/zmG97N4LLeR+0y36jJiVmOPgQPx2uIGkexZqi1HkbXXsgFS0JVKWekmDQN79oM2lII44dkg+6Htt6ZBM6j/nN+KdH7HgHKdCJkCYH3IzATpno7FTv0su0LXTXotm1iNFxWSv5uRWTWc9TTtifo8SNfKWKNfl0MM9ahG9T7Fl+uR5ukhonBmMDhCQnd438SrYTraNAm0LBYebBLDLbYoGU5C+cd1m4LQHGOOl3iZ/ilbwhHb3q9XZWBm+S80bjULRfAV88BC9HavpXXMDBpUaNwRGYJe37GVQiwmQxNGGZ667+qm30u6EF49iTOPS0vCTYA1YWDFRdD 9BCK439V Ch/u8gGJFHHoFju9lHC6i2gXbMuyv687MC6msSkOHTt677NkgOwiefxuspmH9I0Rjf+jdHYd3LmQGKOW9Hl/zOwa0eOmYabtv7gTIuyxVTAoMyV3kjSYiczcqL8L5yQ6K7zlJbVaCi9jaazrMYspdha0ErGLNCasQAPLj+DjsICeHLXMcGfI/6n+lDYeJdjMOdnBfcF0vvKyfu0Xu2Q0zaZHOWZTskzIaYNUmYi7LFNGICVK1+zSkY/SXINnbSK/7VUUIYaq0n0JaSfY6XEZf1zSRL7a7FE33V95Trv9Zwn4ymVo= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Oct 29, 2025 at 9:11=E2=80=AFPM Maciej Wieczor-Retman wrote: > > From: Maciej Wieczor-Retman > > - ffffec0000000000 | -20 TB | fffffbffffffffff | 16 TB | KASAN sh= adow memory > + ffffec0000000000 | -20 TB | fffffbffffffffff | 16 TB | KASAN sh= adow memory (generic mode) > + fffff40000000000 | -8 TB | fffffbffffffffff | 8 TB | KASAN sh= adow memory (software tag-based mode) > __________________|____________|__________________|_________|_________= ___________________________________________________ > + ffdf000000000000 | -8.25 PB | fffffbffffffffff | ~8 PB | KASAN sh= adow memory (generic mode) > + ffeffc0000000000 | -6 PB | fffffbffffffffff | 4 PB | KASAN sh= adow memory (software tag-based mode) > __________________|____________|__________________|_________|_________= ___________________________________________________ > + default 0xeffffc0000000000 if KASAN_SW_TAGS > default 0xdffffc0000000000 Please elaborate in the patch description how these values were picked.