From patchwork Mon Jul 19 05:41:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 12384713 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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 C29EEC12002 for ; Mon, 19 Jul 2021 05:41:31 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 59A82610A5 for ; Mon, 19 Jul 2021 05:41:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 59A82610A5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E831E8D00F6; Mon, 19 Jul 2021 01:41:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E5A168D00EC; Mon, 19 Jul 2021 01:41:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CFB9A8D00F6; Mon, 19 Jul 2021 01:41:31 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0168.hostedemail.com [216.40.44.168]) by kanga.kvack.org (Postfix) with ESMTP id AD0968D00EC for ; Mon, 19 Jul 2021 01:41:31 -0400 (EDT) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 56FC22311B for ; Mon, 19 Jul 2021 05:41:30 +0000 (UTC) X-FDA: 78378239940.30.34354ED Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf16.hostedemail.com (Postfix) with ESMTP id DA4F5F00008E for ; Mon, 19 Jul 2021 05:41:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1626673289; h=from:from: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; bh=k8vrwGfi4buaNEKiEDx9yVcWKxB1hoROC6N2FWsbEvQ=; b=CsI7TQ8Zrq/e4jO69rKVEX1ahOWGXdSz/XUkoBxGLu+LXyTAFM8/3DiTtThyalX0l0BBbL PQDZCRkY+C+e651OlMmRPv7BkTx3yp2hDKLquEuXXMZU1h2Fmm7TXQbLiQON34VxCzJ2/y IeXEQFLo0r8FCkqitpwFV56UORZ1s9c= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-480-t-2HJhyMM0SvCUaAJKJ_3w-1; Mon, 19 Jul 2021 01:41:27 -0400 X-MC-Unique: t-2HJhyMM0SvCUaAJKJ_3w-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A1648362F8; Mon, 19 Jul 2021 05:41:26 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-195.bne.redhat.com [10.64.54.195]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D5E4869CB4; Mon, 19 Jul 2021 05:41:23 +0000 (UTC) From: Gavin Shan To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, anshuman.khandual@arm.com, catalin.marinas@arm.com, will@kernel.org, akpm@linux-foundation.org, chuhu@redhat.com, shan.gavin@gmail.com Subject: [PATCH v2 00/12] mm/debug_vm_pgtable: Enhancements Date: Mon, 19 Jul 2021 13:41:26 +0800 Message-Id: <20210719054138.198373-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: DA4F5F00008E X-Stat-Signature: iztq5hqa5rsc8r4dq6zw4dmecbfs7gx6 Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=CsI7TQ8Z; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf16.hostedemail.com: domain of gshan@redhat.com has no SPF policy when checking 170.10.133.124) smtp.mailfrom=gshan@redhat.com X-HE-Tag: 1626673289-590791 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: There are couple of issues with current implementations and this series tries to resolve the issues: (a) All needed information are scattered in variables, passed to various test functions. The code is organized in pretty much relaxed fashion. (b) The page isn't allocated from buddy during page table entry modifying tests. The page can be invalid, conflicting to the implementations of set_xxx_at() on ARM64. The target page is accessed so that the iCache can be flushed when execution permission is given on ARM64. Besides, the target page can be unmapped and access to it causes kernel crash. "struct pgtable_debug_args" is introduced to address issue (a). For issue (b), the used page is allocated from buddy in page table entry modifying tests. The corresponding tets will be skipped if we fail to allocate the (huge) page. For other test cases, the original page around to kernel symbol (@start_kernel) is still used. The patches are organized as below. PATCH[2-10] could be combined to one patch, but it will make the review harder: PATCH[1] introduces "struct pgtable_debug_args" as place holder of all needed information. With it, the old and new implementation can coexist. PATCH[2-10] uses "struct pgtable_debug_args" in various test functions. PATCH[11] removes the old implementation. PATCH[12] fixes the issue of corrupted page flag for ARM64 Changelog ========= v2: * Rename struct vm_pgtable_debug to struct pgtable_debug_args. The parameter name to various test functions are renamed to "@args" (Anshuman) * Code changes as suggested by Anshuman (Anshuman) Gavin Shan (12): mm/debug_vm_pgtable: Introduce struct pgtable_debug_args mm/debug_vm_pgtable: Use struct pgtable_debug_args in basic tests mm/debug_vm_pgtable: Use struct pgtable_debug_args in leaf and savewrite tests mm/debug_vm_pgtable: Use struct pgtable_debug_args in protnone and devmap tests mm/vm_debug_pgtable: Use struct pgtable_debug_args in soft_dirty and swap tests mm/debug_vm_pgtable: Use struct pgtable_debug_args in migration and thp tests mm/debug_vm_pgtable: Use struct pgtable_debug_args in PTE modifying tests mm/debug_vm_pgtable: Use struct pgtable_debug_args in PMD mm/vm_debug_pgtable: Use struct pgtable_debug_args in PUD modifying tests mm/debug_vm_pgtable: Use struct pgtable_debug_args in PGD and P4D modifying tests mm/debug_vm_pgtable: Remove unused code mm/debug_vm_pgtable: Fix corrupted page flag mm/debug_vm_pgtable.c | 849 ++++++++++++++++++++++++------------------ 1 file changed, 479 insertions(+), 370 deletions(-)