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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 1B39FC433ED for ; Wed, 21 Apr 2021 12:29:42 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 516D7613DE for ; Wed, 21 Apr 2021 12:29:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 516D7613DE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=csgroup.eu Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BEF176B006C; Wed, 21 Apr 2021 08:29:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B9FA86B006E; Wed, 21 Apr 2021 08:29:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A3F006B0070; Wed, 21 Apr 2021 08:29:40 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0065.hostedemail.com [216.40.44.65]) by kanga.kvack.org (Postfix) with ESMTP id 881526B006C for ; Wed, 21 Apr 2021 08:29:40 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 411C6824805A for ; Wed, 21 Apr 2021 12:29:40 +0000 (UTC) X-FDA: 78056305320.05.7C255A7 Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) by imf20.hostedemail.com (Postfix) with ESMTP id 78C6EE8 for ; Wed, 21 Apr 2021 12:29:32 +0000 (UTC) Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4FQKcc4dPYz9tvqS; Wed, 21 Apr 2021 14:29:36 +0200 (CEST) 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 CeELRF3p2Hho; Wed, 21 Apr 2021 14:29:36 +0200 (CEST) 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 4FQKcc3hDwz9tvq9; Wed, 21 Apr 2021 14:29:36 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id D6FBC8B825; Wed, 21 Apr 2021 14:29:37 +0200 (CEST) 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 T1yXWHZXlfsX; Wed, 21 Apr 2021 14:29:37 +0200 (CEST) Received: from [192.168.4.90] (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 62B1F8B770; Wed, 21 Apr 2021 14:29:37 +0200 (CEST) Subject: Re: [PATCH v11 6/6] powerpc: Book3S 64-bit outline-only KASAN support 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: <20210319144058.772525-1-dja@axtens.net> <20210319144058.772525-7-dja@axtens.net> From: Christophe Leroy Message-ID: Date: Wed, 21 Apr 2021 14:29:38 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1 MIME-Version: 1.0 In-Reply-To: <20210319144058.772525-7-dja@axtens.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 78C6EE8 X-Stat-Signature: h6fznf5zap946pfqqhmkxf6za7soxaq8 Received-SPF: none (csgroup.eu>: No applicable sender policy available) receiver=imf20; identity=mailfrom; envelope-from=""; helo=pegase1.c-s.fr; client-ip=93.17.236.30 X-HE-DKIM-Result: none/none X-HE-Tag: 1619008172-908189 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 19/03/2021 =C3=A0 15:40, Daniel Axtens a =C3=A9crit=C2=A0: > diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/p= tdump.c > index aca354fb670b..63672aa656e8 100644 > --- a/arch/powerpc/mm/ptdump/ptdump.c > +++ b/arch/powerpc/mm/ptdump/ptdump.c > @@ -20,6 +20,7 @@ > #include > #include > #include > +#include > #include > #include > =20 > @@ -317,6 +318,23 @@ static void walk_pud(struct pg_state *st, p4d_t *p= 4d, unsigned long start) > unsigned long addr; > unsigned int i; > =20 > +#if defined(CONFIG_KASAN) && defined(CONFIG_PPC_BOOK3S_64) > + /* > + * On radix + KASAN, we want to check for the KASAN "early" shadow > + * which covers huge quantities of memory with the same set of > + * read-only PTEs. If it is, we want to note the first page (to see > + * the status change), and then note the last page. This gives us goo= d > + * results without spending ages noting the exact same PTEs over 100s= of > + * terabytes of memory. > + */ > + if (p4d_page(*p4d) =3D=3D virt_to_page(lm_alias(kasan_early_shadow_pu= d))) { > + walk_pmd(st, pud, start); > + addr =3D start + (PTRS_PER_PUD - 1) * PUD_SIZE; > + walk_pmd(st, pud, addr); > + return; > + } > +#endif > + > for (i =3D 0; i < PTRS_PER_PUD; i++, pud++) { > addr =3D start + i * PUD_SIZE; > if (!pud_none(*pud) && !pud_is_leaf(*pud)) The above changes should not be necessary once PPC_PTDUMP is converted to= GENERIC_PTDUMP. See https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=3D2397= 95 Christophe