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Fri, 6 Sep 2024 11:49:10 -0700 Date: Fri, 6 Sep 2024 11:49:08 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: Mostafa Saleh , , Hanjun Guo , , Joerg Roedel , Kevin Tian , , Len Brown , , , Lorenzo Pieralisi , "Rafael J. Wysocki" , "Robert Moore" , Robin Murphy , "Sudeep Holla" , Will Deacon , Alex Williamson , Eric Auger , Jean-Philippe Brucker , Moritz Fischer , Michael Shavit , , Shameerali Kolothum Thodi Subject: Re: [PATCH v2 8/8] iommu/arm-smmu-v3: Support IOMMU_DOMAIN_NESTED Message-ID: References: <0-v2-621370057090+91fec-smmuv3_nesting_jgg@nvidia.com> <8-v2-621370057090+91fec-smmuv3_nesting_jgg@nvidia.com> <20240830170426.GV3773488@nvidia.com> <20240906182831.GN1358970@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20240906182831.GN1358970@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF00004685:EE_|MW4PR12MB5604:EE_ X-MS-Office365-Filtering-Correlation-Id: 31b013a1-3899-4ddf-4f9b-08dccea4a071 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700013|1800799024|82310400026|7416014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?VDR4KrSuI4C8VeZJsxgAhQByWbXpDiC0aIfXaHaDUnDK3dBWjcLeSOII65Wk?= =?us-ascii?Q?UN5ps9g4L98GBOnuVId+zbtXJpLPK9hiY9Gum2QuHJ0ihj+0AZotudxOYnfN?= =?us-ascii?Q?dlnDN6BhDJzjJU4EMegrxNtEC/lB1A8IfqyVc/X58gqgbOTntCLi/+3z9PUX?= =?us-ascii?Q?nV8Z7KgB4ya6yftawwzXQ80tjIonvj5NEuc2eEOGKObXvympI0J0XGM8LNlc?= =?us-ascii?Q?oyl3WlprV91OJPbr0rofYssFVGdUsD/fDh2WbGnKTK/4Ses7vH9pRtk0c1c8?= =?us-ascii?Q?XayAlu2FPOTmuhRrjZEjWr2vxf3ZMdA/jU8SN4Ia35E15S7HbQZD8ItljK+Q?= =?us-ascii?Q?KMxcabzCvIcv2JgOl390mwvzahoi1TAo92XG/1fTzczbgKLhUTc+awmmlHiX?= =?us-ascii?Q?cGtn44Q9iChPHy+dMkQfxUY1FtBU5TnqEDQEHM+KL3XHybws5merwAyYk5Er?= =?us-ascii?Q?z/qpwki2fGvSRd+P65GVp7911V/PANdIAh9pgEdG2MJ5xPHn4Be7rwEo7nKE?= =?us-ascii?Q?vdt9EQwS028yaYMfYImRVRRCeOSqYza4gHZT1yhMCkIHMg0FuSFnWpLSyQBp?= =?us-ascii?Q?aSWg4MzkecTacdK2jKYpBdFm62pDtn5au7WOr6m5HssfNSzJ16/N6P2Tv36K?= =?us-ascii?Q?iJsocoRSND36N0H07bDbtK+LgDLhGkU3N+WG7GuTlfBZVgpsnPbpSkFMi1PU?= =?us-ascii?Q?G3htVkdF6Qru+kjYXUyZuWiOj7ymmqvewhYI5cwl3mPFat6S69xu0n9Ww3gx?= =?us-ascii?Q?vVo805qkEu3Uzf4gxrWRXXe7oYfD2yWLub9GLvfVTSh/s+z3+ol4r8PAANu7?= =?us-ascii?Q?5zzQjht14p5widc6xmNCxVZFBG4IYkcAtCFp4X+qWgnfaaXIg4M/b1dAxcI0?= =?us-ascii?Q?nfIs+26mwYXIZP+j+J42jmrUc92j1pnQ/Z3mJoXEVAHH6tDbOgadFnX4Ur72?= =?us-ascii?Q?TcFxq8HY+3WbI+oKd6oo9IE3x59DP010+bw+3yODr3XjXBhS86VQ1I0NJN+F?= =?us-ascii?Q?wXZcQUSJV7pBdMIivs5O6q4i9yfuygWJEMbK5IjGV1ODBymJ4hFd3qpDB8hk?= =?us-ascii?Q?42f/nX2GXMZUufkx0N1FQQEuQCdksSyQtn29i1UeH0BFMchlstKYZft2ESij?= =?us-ascii?Q?xM06LIvgRcHJ7JUZvyfgQAkLMmMU5KhXvyel81zQlLqvso19GfAcAsWUcQnm?= =?us-ascii?Q?syhdcqElX3iveHupsyH8Ln6o1gG8wiAs4JraxEHTc8oPJGhm8ERoY2SIVbwD?= =?us-ascii?Q?3TLeZH9Sl4r1k22ojKBuh6SphSITRTzxA2L1ykXsaHouLAjk9npqJ4U47jQ7?= =?us-ascii?Q?pkIUGEsi2mTfANPNGTkIkQBXl8TcYZAm+3pbz8ETNIcgNOP8kpWdMJ9QbZ8F?= =?us-ascii?Q?1S1QC0xGqpzJDFJ6s4i8MSUgPV/0UFlTwciV2X47wQx4mCD5mGBGOVYqG+ur?= =?us-ascii?Q?fqqHRxqzT5hCyQsUtFsZiuWrRzt2y8Iz?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(36860700013)(1800799024)(82310400026)(7416014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Sep 2024 18:49:23.9319 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 31b013a1-3899-4ddf-4f9b-08dccea4a071 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF00004685.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB5604 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240906_114934_120587_A98CA9E1 X-CRM114-Status: GOOD ( 15.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Sep 06, 2024 at 03:28:31PM -0300, Jason Gunthorpe wrote: > On Fri, Aug 30, 2024 at 02:04:26PM -0300, Jason Gunthorpe wrote: > > > Really, this series and that series must be together. We have a patch > > planning issue to sort out here as well, all 27 should go together > > into the same merge window. > > I'm thinking strongly about moving the nesting code into > arm-smmuv3-nesting.c and wrapping it all in a kconfig. Similar to > SVA. Now that we see the viommu related code and more it will be a few > hundred lines there. +1 for this. I was thinking of doing that when I started drafting patches, yet at that time we only had a couple of functions. Now, with viommu_ops, it has grown. > We'd leave the kconfig off until all of the parts are merged. There > are enough dependent series here that this seems to be the best > compromise.. Embedded cases can turn it off so it is longterm useful. You mean doing that so as to merge two series separately? I wonder if somebody might turn it on while the 2nd series isn't merge... Thanks Nicolin