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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 321D2C2B9F4 for ; Tue, 15 Jun 2021 01:49:48 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B52B061378 for ; Tue, 15 Jun 2021 01:49:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B52B061378 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=axtens.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4G3rpz1NMwz3dDb for ; Tue, 15 Jun 2021 11:49:47 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=axtens.net header.i=@axtens.net header.a=rsa-sha256 header.s=google header.b=X0nswPKS; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=axtens.net (client-ip=2607:f8b0:4864:20::534; helo=mail-pg1-x534.google.com; envelope-from=dja@axtens.net; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=axtens.net header.i=@axtens.net header.a=rsa-sha256 header.s=google header.b=X0nswPKS; dkim-atps=neutral Received: from mail-pg1-x534.google.com (mail-pg1-x534.google.com [IPv6:2607:f8b0:4864:20::534]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4G3rmL5nD9z308d for ; Tue, 15 Jun 2021 11:47:30 +1000 (AEST) Received: by mail-pg1-x534.google.com with SMTP id w31so7640171pga.6 for ; Mon, 14 Jun 2021 18:47:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axtens.net; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=l3K1BTqaM5pKy65dpCEo3lZI1RCD2stLd5UR2x4SDMk=; b=X0nswPKSD51xx5SUUNgPTOxx9Nzx2H96D/YduRYRZHo+ejqCQzThCbpTVUia8QeV9R HdIR5kd9RP86hki3k4UkBoiYhfysqZ1n0rn+upB0o0TRnfoK96DT08O5/uKpVd6JcNjt W/u6S+e7PCOUhEJSpkXQzLSmHd4ODdHjB47m8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=l3K1BTqaM5pKy65dpCEo3lZI1RCD2stLd5UR2x4SDMk=; b=gbgsm7H7ESHL9829xnPHoCUeDMDpxY2KWiJXw3vFQZozfn6PdvgSryk6XGixczXFvZ zvNdkubo5FdYl9Amb7I1RJu79dwr2y4GvrZd2EQfIOrFD9gvZkvJ4aHQIh+LJ7AyO9Gk g6lS9B6jn6qV7SITb7mdoHbJryxnvzXM5jBQ/v9cOGAGZoBA1OzshknnMumzpriP0fLo x6hKC4p9TkLjdtcfzxBDWJZdR4Hdt22oLK0iK9Gp1X2dKkXQqkqq5OQ5xb3Nyc7Kg8BN mXk/1/3LgEV3T5bfypeIwZ3M/fSZ0+r7YxWALKkNtMmaeyDLKW2q9qnfPnJ/A22ecN/b rNUw== X-Gm-Message-State: AOAM533DHLXSYc0OZusezzs1MP7rOVi+vLiQAzTLy1DZpyVJjYHTn0C/ lKX5HcKQOWxYpmDWGdnKQgZPdw== X-Google-Smtp-Source: ABdhPJw7o9IChYHT/R02LwCZbPFFEfQ7b/20+CtiE7nlvaJ6m/AvsWXKO7fqTTME6tiaz6HvSr0q9g== X-Received: by 2002:a63:5d52:: with SMTP id o18mr19853904pgm.440.1623721647575; Mon, 14 Jun 2021 18:47:27 -0700 (PDT) Received: from localhost ([203.206.29.204]) by smtp.gmail.com with ESMTPSA id n6sm14378524pgm.79.2021.06.14.18.47.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Jun 2021 18:47:27 -0700 (PDT) From: Daniel Axtens To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, kasan-dev@googlegroups.com, christophe.leroy@csgroup.eu, aneesh.kumar@linux.ibm.com, bsingharora@gmail.com Subject: [PATCH v12 4/6] kasan: Document support on 32-bit powerpc Date: Tue, 15 Jun 2021 11:47:03 +1000 Message-Id: <20210615014705.2234866-5-dja@axtens.net> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210615014705.2234866-1-dja@axtens.net> References: <20210615014705.2234866-1-dja@axtens.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: elver@google.com, Daniel Axtens Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" KASAN is supported on 32-bit powerpc and the docs should reflect this. Suggested-by: Christophe Leroy Reviewed-by: Christophe Leroy Signed-off-by: Daniel Axtens --- Documentation/dev-tools/kasan.rst | 8 ++++++-- Documentation/powerpc/kasan.txt | 12 ++++++++++++ 2 files changed, 18 insertions(+), 2 deletions(-) create mode 100644 Documentation/powerpc/kasan.txt diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst index 83ec4a556c19..05d2d428a332 100644 --- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst @@ -36,7 +36,8 @@ Both software KASAN modes work with SLUB and SLAB memory allocators, while the hardware tag-based KASAN currently only supports SLUB. Currently, generic KASAN is supported for the x86_64, arm, arm64, xtensa, s390, -and riscv architectures, and tag-based KASAN modes are supported only for arm64. +and riscv architectures. It is also supported on 32-bit powerpc kernels. +Tag-based KASAN modes are supported only for arm64. Usage ----- @@ -343,7 +344,10 @@ CONFIG_KASAN_VMALLOC With ``CONFIG_KASAN_VMALLOC``, KASAN can cover vmalloc space at the cost of greater memory usage. Currently, this is supported on x86, -riscv, s390, and powerpc. +riscv, s390, and 32-bit powerpc. + +It is optional, except on 32-bit powerpc kernels with module support, +where it is required. This works by hooking into vmalloc and vmap and dynamically allocating real shadow memory to back the mappings. diff --git a/Documentation/powerpc/kasan.txt b/Documentation/powerpc/kasan.txt new file mode 100644 index 000000000000..26bb0e8bb18c --- /dev/null +++ b/Documentation/powerpc/kasan.txt @@ -0,0 +1,12 @@ +KASAN is supported on powerpc on 32-bit only. + +32 bit support +============== + +KASAN is supported on both hash and nohash MMUs on 32-bit. + +The shadow area sits at the top of the kernel virtual memory space above the +fixmap area and occupies one eighth of the total kernel virtual memory space. + +Instrumentation of the vmalloc area is optional, unless built with modules, +in which case it is required. -- 2.27.0