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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A2D16C7EE36 for ; Wed, 1 Mar 2023 15:47:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=7LaDkP1Q4O4E9Ouwpi48oTr9bwrlffsIAs3zXoQ7ZKQ=; b=elUn1UBvjr4EIgkVKl7uv1LNhY t+Rd2dKgaZZOU8bjsIV8hzIGR8qcXM1FDLJRJkJjmkQEWv9pYDLgWtgNLp+QfdptdOfo9IRrDvpuR 8xEfQDP629nTiymn7rFS0Jajks9xxzZusGPdc8n/IYHGyrah1TTIBXZ6karHXRONkVWLenGxtzCB8 h+Fk9s0B9BRCxKIi9qzy13WGlPKDW1hkbrRAP2dreAVJTeOyI1dMMVac8O+GSoqi+WPYLJJ7hqL1A WWRcvS63oqXsoQWYpXAVgt5rC3+5ysR7Vx6th85SCCGzK1MuBx70gAc0uASCMvRU16/rT/HKZovYm dY3Yc8cg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pXOfm-00Ggt7-V7; Wed, 01 Mar 2023 15:47:18 +0000 Received: from mail-pj1-x102a.google.com ([2607:f8b0:4864:20::102a]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pXOaI-00GeSa-V4 for linux-snps-arc@lists.infradead.org; Wed, 01 Mar 2023 15:41:41 +0000 Received: by mail-pj1-x102a.google.com with SMTP id kb15so13779375pjb.1 for ; Wed, 01 Mar 2023 07:41:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20210112.gappssmtp.com; s=20210112; t=1677685296; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=T04RMfKzSUFRrZ3CYc3+bErGU8vpxkP2QVI3mwlpG78=; b=RacUjtkKVhkSdFUBywOGho+8dt8NsK+GHdxWXdQ69WX2yCf/yYWl7r6icMXBWT/ShM KzbzJEeKqlnWntlEh4Hu5sno9Ak81pDzhFum2pY94j4Sv2hldxTUvXOesOtDXjR8r6gc qTgIZDS9fRsSDLNbTTTqAFsgPsTJ/DQ+0jjGE9ek1g+5UBhUcmjFAxCNoVki1FxJorhz 1mqoDsTuoBLwUNz+cTKmWUvmBN0WlvjuL/8NCCPe/UsZ69pgJ+6lNteW1mdicJGes/KY sz2TvcyHAjAaMaJRH5/VJiCFama3PVa+Xs98E38Ow6CsZfQ4ni3p2/e/LUrMvV5jGCLw yEmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1677685296; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=T04RMfKzSUFRrZ3CYc3+bErGU8vpxkP2QVI3mwlpG78=; b=lGMh+bLupBxPg16n8dJroDgy24wstnJzivVtIPS8gRcdzVkzn/gA/RnEXBOQ5Obejd W8RYHq85Yk7cSFaNOhOyXUL2i6ZgLumE+mAP7Vjkl+0W/bykzvvw3QLOXeiMOwrNjyaI toQJ9nnQfYmgE4noy944cnE7j52Vjwrh883wh4vQFirCdWtRWLNxbQsKTYD/8ZJUwSOa rYI2k0+VyK1i332I9R6FGzbgtGbnnVVF/cAmLC8+k1RanSED3zAzAu72d6AFxALRDNqW QwFRqXSwgZ0RT7Q49y3X9Ky3JkMaagEoql5erfzH2qVJkqrA27YBiXuz2draU7fJLrTX Rdnw== X-Gm-Message-State: AO0yUKVihLpBtCOwEO7te55IQHWG4v3XcGaIWratz8D6IjXvdajvYa7W DTijnXckcjJHHT/HrHLzMtosSQ== X-Google-Smtp-Source: AK7set89u8u7K351sr+Ck6r7PKKsfq0NxjZus48TDBYC9SmTqwP5jGqb0tSf18Db2RC/D0Tp3KOSQg== X-Received: by 2002:a05:6a20:2444:b0:cc:ac05:88f7 with SMTP id t4-20020a056a20244400b000ccac0588f7mr8304959pzc.34.1677685295782; Wed, 01 Mar 2023 07:41:35 -0800 (PST) Received: from debug.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id l12-20020a62be0c000000b005821c109cebsm8058970pff.199.2023.03.01.07.41.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Mar 2023 07:41:35 -0800 (PST) Date: Wed, 1 Mar 2023 07:41:30 -0800 From: Deepak Gupta To: Rick Edgecombe Cc: x86@kernel.org, "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H . J . Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , Weijiang Yang , "Kirill A . Shutemov" , John Allen , kcc@google.com, eranian@google.com, rppt@kernel.org, jamorris@linux.microsoft.com, dethoma@microsoft.com, akpm@linux-foundation.org, Andrew.Cooper3@citrix.com, christina.schimpe@intel.com, david@redhat.com, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, Michal Simek , Dinh Nguyen , linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, xen-devel@lists.xenproject.org Subject: Re: [PATCH v6 13/41] mm: Make pte_mkwrite() take a VMA Message-ID: <20230301154130.GB3505369@debug.ba.rivosinc.com> References: <20230218211433.26859-1-rick.p.edgecombe@intel.com> <20230218211433.26859-14-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230218211433.26859-14-rick.p.edgecombe@intel.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230301_074139_085497_E500A6CA X-CRM114-Status: GOOD ( 12.01 ) X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=archiver.kernel.org@lists.infradead.org On Sat, Feb 18, 2023 at 01:14:05PM -0800, Rick Edgecombe wrote: >The x86 Control-flow Enforcement Technology (CET) feature includes a new >type of memory called shadow stack. This shadow stack memory has some >unusual properties, which requires some core mm changes to function >properly. > >One of these unusual properties is that shadow stack memory is writable, >but only in limited ways. These limits are applied via a specific PTE >bit combination. Nevertheless, the memory is writable, and core mm code >will need to apply the writable permissions in the typical paths that >call pte_mkwrite(). > >In addition to VM_WRITE, the shadow stack VMA's will have a flag denoting >that they are special shadow stack flavor of writable memory. So make >pte_mkwrite() take a VMA, so that the x86 implementation of it can know to >create regular writable memory or shadow stack memory. > >Apply the same changes for pmd_mkwrite() and huge_pte_mkwrite(). > >No functional change. > >Cc: linux-doc@vger.kernel.org >Cc: linux-kernel@vger.kernel.org >Cc: linux-alpha@vger.kernel.org >Cc: linux-snps-arc@lists.infradead.org >Cc: linux-arm-kernel@lists.infradead.org >Cc: linux-csky@vger.kernel.org >Cc: linux-hexagon@vger.kernel.org >Cc: linux-ia64@vger.kernel.org >Cc: loongarch@lists.linux.dev >Cc: linux-m68k@lists.linux-m68k.org >Cc: Michal Simek >Cc: Dinh Nguyen >Cc: linux-mips@vger.kernel.org >Cc: openrisc@lists.librecores.org >Cc: linux-parisc@vger.kernel.org >Cc: linuxppc-dev@lists.ozlabs.org >Cc: linux-riscv@lists.infradead.org >Cc: linux-s390@vger.kernel.org >Cc: linux-sh@vger.kernel.org >Cc: sparclinux@vger.kernel.org >Cc: linux-um@lists.infradead.org >Cc: xen-devel@lists.xenproject.org >Cc: linux-arch@vger.kernel.org >Cc: linux-mm@kvack.org >Tested-by: Pengfei Xu >Suggested-by: David Hildenbrand >Signed-off-by: Rick Edgecombe > Acked-by: Deepak Gupta _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc