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 X-Spam-Level: X-Spam-Status: No, score=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1315FC33CB6 for ; Thu, 16 Jan 2020 09:34:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CC1B1207FF for ; Thu, 16 Jan 2020 09:34:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="bdDCDEzJ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CC1B1207FF Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6A3E88E005A; Thu, 16 Jan 2020 04:34:09 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 654188E003F; Thu, 16 Jan 2020 04:34:09 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 51C278E005A; Thu, 16 Jan 2020 04:34:09 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0021.hostedemail.com [216.40.44.21]) by kanga.kvack.org (Postfix) with ESMTP id 3CD028E003F for ; Thu, 16 Jan 2020 04:34:09 -0500 (EST) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id CA881A2A5 for ; Thu, 16 Jan 2020 09:34:08 +0000 (UTC) X-FDA: 76382986176.16.spy00_2422cc0098411 X-HE-Tag: spy00_2422cc0098411 X-Filterd-Recvd-Size: 3408 Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) by imf08.hostedemail.com (Postfix) with ESMTP for ; Thu, 16 Jan 2020 09:34:08 +0000 (UTC) Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 47yzXs45Nbz9tyQL; Thu, 16 Jan 2020 10:34:05 +0100 (CET) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=bdDCDEzJ; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id U8nIyqefG5v1; Thu, 16 Jan 2020 10:34:05 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 47yzXs32ysz9tyQK; Thu, 16 Jan 2020 10:34:05 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1579167245; bh=IEAXhb+SjJPqUD1Zb1vn+3GKKBJH4VCJ7C1isv48Ggo=; h=Subject:To:References:From:Date:In-Reply-To:From; b=bdDCDEzJBDKpMZIDPaRWu1S7MBHDg8dEK/pOSodR7nkO7rmvqqSCxIv61NAvEMhly tjKfoP0FRRzhZS1bpnBkPx0HorlJWRmdde8ZBqSQydFJDMA3Pi0ZBFQ1VyF30EViUU NycCRX/C3sPS8WXWWvuHzglQQvP8REiOzojyMsSs= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 7E9CC8B812; Thu, 16 Jan 2020 10:34:06 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id CZ-uRnBuwtrT; Thu, 16 Jan 2020 10:34:06 +0100 (CET) Received: from [192.168.4.90] (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id E40738B810; Thu, 16 Jan 2020 10:34:05 +0100 (CET) Subject: Re: [PATCH v5 0/4] KASAN for powerpc64 radix To: Daniel Axtens , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, kasan-dev@googlegroups.com, aneesh.kumar@linux.ibm.com, bsingharora@gmail.com References: <20200109070811.31169-1-dja@axtens.net> From: Christophe Leroy Message-ID: <8a1b7f4b-de14-90fe-2efa-789882d28702@c-s.fr> Date: Thu, 16 Jan 2020 10:34:05 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <20200109070811.31169-1-dja@axtens.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: quoted-printable 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: Le 09/01/2020 =C3=A0 08:08, Daniel Axtens a =C3=A9crit=C2=A0: > Building on the work of Christophe, Aneesh and Balbir, I've ported > KASAN to 64-bit Book3S kernels running on the Radix MMU. >=20 > This provides full inline instrumentation on radix, but does require > that you be able to specify the amount of physically contiguous memory > on the system at compile time. More details in patch 4. This might be a stupid idea as I don't know ppc64 much. IIUC, PPC64=20 kernel can be relocated, there is no requirement to have it at address=20 0. Therefore, would it be possible to put the KASAN shadow mem at the=20 begining of the physical memory, instead of putting it at the end ? That way, you wouldn't need to know the amount of memory at compile time=20 because KASAN shadow mem would always be at address 0. Christophe