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=-14.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, 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 CF5C8C433B4 for ; Thu, 29 Apr 2021 16:29:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 924E961407 for ; Thu, 29 Apr 2021 16:29:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240816AbhD2Qah (ORCPT ); Thu, 29 Apr 2021 12:30:37 -0400 Received: from mail-dm6nam11on2084.outbound.protection.outlook.com ([40.107.223.84]:15136 "EHLO NAM11-DM6-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S233302AbhD2Qag (ORCPT ); Thu, 29 Apr 2021 12:30:36 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=DV0ATN2ybJSbGaOcgFaNG/5ubyTqtTCUSepKDkSAbYrLRGcqR6Vh0lgja/IFKAB+eprKzyxSEKlGEW98Glt3n4iw26lcffhbenGJeNDew4oXC9ld4FVZb/JcgZJo2aNxsB6jB2vM8RcWJMNV7i9SpZJCP6PsZe977bDqScMADC0BlaUjMiFTQe0KeEn9lRdRK3ufjiHN8nY/Y9e1dgu4/QV6Ejlbno+ps8SoWm1ufC1zMyPBBwS8lViRACYJKdgvMFNiFqaMcTkyenVZqpWOCPTzuRVB8P/vLsS89PQ2l/euZgumZFBoxQgZcyq5kHBzvkpGWrXmzFQoBIN9mXYrBA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=MKwmcvJlnAryc2O6/Z+gYUK6HFhpJR4lqcr9k33pB4Q=; b=bnHOH34+Dn/8QRkgfLQ/LH05BqShguZrvZEzkltsbJi1I2kv454U+8E9eJK2+UbW//Vx4dCmGZ3tUOmfyv0r+PbLsg/IqLQB+jHq3pWlEBZHthepfTB1erTIqUp4fB9e+dfhmUOqrLPvlrN0ONUPVn3wGyj3MXLTFSNmxLA77oYbnqpba0t2Xn+9rFy/LctpVqGSlGLFaoWVu6mLoGPTgC7xAQeoYLbByiGwK4L9FCvvJ3qYtRcRWLrFmmcFL0E4o4NQ3I7XlPwK9gBD0xF9FcZGoR8dqh5jLoEexq9ltbP2k16ck40IWgMb/xCdJDsb71OQZhJqJzGgDMXgBrcMwQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.112.34) smtp.rcpttodomain=lists.cs.columbia.edu smtp.mailfrom=nvidia.com; dmarc=pass (p=none sp=none pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=MKwmcvJlnAryc2O6/Z+gYUK6HFhpJR4lqcr9k33pB4Q=; b=Y0lgFBEp0B8kAw0Fr8k3f8yyD758FK8fHHglbbkNtXSwd9zeTMkI75ZCpON3U7/2Pzb1SCFng6fp2ICrjV1s4KGy7oP1HZ/sOeFASp5Rp3BJf4UcYjS11AcVvw/qRIAT3DEUka9OWOQ/QXu7iIGQM2KQkRs8RrrCHMR3A7sWkic7WwVTBCOQZvGCoLQtSmWGMNZRvqAlyJsC4bwpu6nwZ/DLbmd2dJerxN0WHuNkK7+WafHe20shc1/ih3sQVw+T4Vr1nnDWGGByCnIdhCp7DcKmpdqJO7RJbTRCIUIzGGicBcYsWqEzNCRafUxCPwTzfubPmyaH70gtSx/wHopheQ== Received: from DS7PR05CA0028.namprd05.prod.outlook.com (2603:10b6:5:3b9::33) by CY4PR12MB1399.namprd12.prod.outlook.com (2603:10b6:903:38::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4065.21; Thu, 29 Apr 2021 16:29:48 +0000 Received: from DM6NAM11FT015.eop-nam11.prod.protection.outlook.com (2603:10b6:5:3b9:cafe::87) by DS7PR05CA0028.outlook.office365.com (2603:10b6:5:3b9::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4108.8 via Frontend Transport; Thu, 29 Apr 2021 16:29:48 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.112.34) smtp.mailfrom=nvidia.com; lists.cs.columbia.edu; dkim=none (message not signed) header.d=none;lists.cs.columbia.edu; dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.112.34 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.112.34; helo=mail.nvidia.com; Received: from mail.nvidia.com (216.228.112.34) by DM6NAM11FT015.mail.protection.outlook.com (10.13.172.133) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.4087.32 via Frontend Transport; Thu, 29 Apr 2021 16:29:48 +0000 Received: from SDONTHINENI-DESKTOP.nvidia.com (172.20.145.6) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 29 Apr 2021 16:29:46 +0000 From: Shanker Donthineni To: Marc Zyngier , Alex Williamson CC: Will Deacon , Catalin Marinas , Christoffer Dall , , , , , Vikram Sethi , Shanker Donthineni , "Jason Sequeira" Subject: [RFC 0/2] [RFC] Honor PCI prefetchable attributes for a virtual machine on ARM64 Date: Thu, 29 Apr 2021 11:29:04 -0500 Message-ID: <20210429162906.32742-1-sdonthineni@nvidia.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [172.20.145.6] X-ClientProxiedBy: HQMAIL107.nvidia.com (172.20.187.13) To HQMAIL107.nvidia.com (172.20.187.13) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 2330b376-b545-4e6b-6277-08d90b2c0196 X-MS-TrafficTypeDiagnostic: CY4PR12MB1399: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.112.34;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:schybrid03.nvidia.com;CAT:NONE;SFS:(4636009)(396003)(346002)(376002)(136003)(39850400004)(46966006)(36840700001)(36756003)(7696005)(70586007)(70206006)(2906002)(2616005)(8936002)(356005)(8676002)(86362001)(5660300002)(83380400001)(336012)(7636003)(36860700001)(82310400003)(1076003)(47076005)(110136005)(82740400003)(107886003)(54906003)(316002)(26005)(16526019)(186003)(36906005)(478600001)(6666004)(4326008)(426003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Apr 2021 16:29:48.0066 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2330b376-b545-4e6b-6277-08d90b2c0196 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.34];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT015.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR12MB1399 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Problem statement: Virtual machine crashes when NVIDIA GPU driver access a prefetchable BAR space due to the unaligned reads/writes for pass-through devices. The same binary works fine as expected in the host kernel. Only one BAR has control & status registers (CSR) and other PCI BARs are marked as prefetchable. NVIDIA GPU driver uses the write-combine feature for mapping the prefetchable BARs to improve performance. This problem applies to all other drivers which want to enable WC. Solution: Honor PCI prefetchable attributes for the guest operating systems. Proposal: ARM64-KVM uses VMA struct for the needed information e.g. region physical address, size, and memory-type (struct page backed mapping or anonymous memory) for setting up a stage-2 page table. Right now memory region either can be mapped as DEVICE (strongly ordered) or NORMAL (write-back cache) depends on the flag VM_PFNMAP in VMA. VFIO-PCI will keep the prefetchable (write-combine) information in vma->vm_page_prot similar to other fields, and KVM will prepare stage-2 entries based on the memory-type attribute that was set in VMA. Shanker Donthineni (2): vfio/pci: keep the prefetchable attribute of a BAR region in VMA KVM: arm64: Add write-combine support for stage-2 entries arch/arm64/include/asm/kvm_mmu.h | 3 ++- arch/arm64/include/asm/kvm_pgtable.h | 2 ++ arch/arm64/include/asm/memory.h | 4 +++- arch/arm64/kvm/hyp/pgtable.c | 9 +++++++-- arch/arm64/kvm/mmu.c | 22 +++++++++++++++++++--- arch/arm64/kvm/vgic/vgic-v2.c | 2 +- drivers/vfio/pci/vfio_pci.c | 6 +++++- 7 files changed, 39 insertions(+), 9 deletions(-) -- 2.17.1