Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Tue, 28 Mar 2023 12:55:40 -0300
From:   Jason Gunthorpe <jgg@nvidia.com>
To:     Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc:     "Tian, Kevin" <kevin.tian@intel.com>,
        LKML <linux-kernel@vger.kernel.org>,
        "iommu@lists.linux.dev" <iommu@lists.linux.dev>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        Joerg Roedel <joro@8bytes.org>,
        "dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
        "vkoul@kernel.org" <vkoul@kernel.org>,
        Robin Murphy <robin.murphy@arm.com>,
        Will Deacon <will@kernel.org>,
        David Woodhouse <dwmw2@infradead.org>,
        "Raj, Ashok" <ashok.raj@intel.com>,
        "Liu, Yi L" <yi.l.liu@intel.com>,
        "Yu, Fenghua" <fenghua.yu@intel.com>,
        "Jiang, Dave" <dave.jiang@intel.com>,
        "Luck, Tony" <tony.luck@intel.com>,
        "Zanussi, Tom" <tom.zanussi@intel.com>
Subject: Re: [PATCH v2 3/8] iommu/sva: Support reservation of global SVA
 PASIDs
Message-ID: <ZCMN/LhCgDfwz+Z/@nvidia.com>
References: <20230327232138.1490712-1-jacob.jun.pan@linux.intel.com>
 <20230327232138.1490712-4-jacob.jun.pan@linux.intel.com>
 <BN9PR11MB527652D88D15437F52FCE8268C889@BN9PR11MB5276.namprd11.prod.outlook.com>
 <20230328083110.294a327c@jacob-builder>
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230328083110.294a327c@jacob-builder>
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?mKV7EXL97aT550qh4Cz8qVGktYfOJmBHWt3D9dc8aUFoJHpIe9qq8v8j/V+p?=
 =?us-ascii?Q?dsFUEwUR3oIcwBq8PCfTeMun01h5ocriDtsA9PmusZzhxpU8YJPzpfmVsd7M?=
 =?us-ascii?Q?VVk3bTFdXAtXwkP0sJ0ROdNjukJacxqzzRsOParBUtXsMeJCe+duMzkkG39Y?=
 =?us-ascii?Q?4D5QM2AGIDgfOSW4+oQJKZEMgbkm6t/Jyj8WZSCX8u0iVoXl+S/ukRZT6WK4?=
 =?us-ascii?Q?/Ch8+vWcSEwtBu3IaBJY2oa4bxSkFrFjlIAnud8cN6YV0W2fMU2PH3txW4C9?=
 =?us-ascii?Q?0GSTvXK5Qvcj/3XkT5B01SGO4Yhbw3zvLOZKxyYl+mgA+wncFXo4iYPAWTRz?=
 =?us-ascii?Q?NI6bbP33OU49VC8Hhny2EGFb5oob+jloTU84iMepDm8lcXwblCfTm7IjlaeN?=
 =?us-ascii?Q?uHmOGcxeFYZcZKLv4+RfbVO7eH65xCMOMJiw7CK8wMfdHp3GkVpyAVcPxbT+?=
 =?us-ascii?Q?jGOjrLUrEn85jYTD5BqZn4mRfeupLRNs/Q5d5PffCIvD9EvSWNmLedp4CAQT?=
 =?us-ascii?Q?hcHNRFwJcna1Cb2fRC2lIqoxxM+RYzu6i+eXOevfNVtWWlhHxTrInUQkxN22?=
 =?us-ascii?Q?vn819B+4h97ZN1+T4/JN5y7N/8ptuuonlUS6v8loFbrk0t3igPdeA2pbcYQT?=
 =?us-ascii?Q?uow6T7uNIzumFZssl1muPRvtetN59iPnuXA7fzeclo8YKNNwUrphnUN+vDuM?=
 =?us-ascii?Q?p1zZdERYRUSH171EBBulFxcFkFVgCYoxNMk6XTEW4wtaehxAqzLoVieGAVwz?=
 =?us-ascii?Q?AD2XfFtzxHwKQM/P7mhcXjvlkisM3Sx3Bp2v/W5w8E7g/lb34pa2zfoXcVl0?=
 =?us-ascii?Q?NDOIxDajXEgPIhxRiFWcu/5k+vFG7jXXVUoYUDgCcRnH6QrH7//fu/qLsdE+?=
 =?us-ascii?Q?RIlDv2Opsnqs13Kp8lZnhDErGUdq6IUsGGQhsla6s8NcM7ZwwXMceu77BsvP?=
 =?us-ascii?Q?P4WyzvNZv8edKtSrNtyGCiJHRLQZle71OpJ9PmrDHucncg5ooVg5Y/LH0Yag?=
 =?us-ascii?Q?CpbFf0qzNHpX4v49v8QbnpHfeslNpDGNUjHbA8/aWdMrw5NpLON1kpfkg1g8?=
 =?us-ascii?Q?ctx8Afpbha2uALgrDWykN6uj1voRY8MkxflpYse1X/jdeZSKiATFa0noQtLr?=
 =?us-ascii?Q?+GccXl1oospRJYN2uOj8YG7Q3LZ6HkCgKAf3bdn+P3zLrMx9uynpHstWvTwX?=
 =?us-ascii?Q?ZcucwPgZQbSX31X3a4upvVdzdXh8EQmM2qXMRIP6rAmGG7c342ww6tm5iudZ?=
 =?us-ascii?Q?ICMIZGV5Kg8JNeZu3XKl/nrb5ymUJhILCObrh3aMveYpPbHAR+2sCZgu4/VC?=
 =?us-ascii?Q?dJrfewBoOi/IjZfUonpL3lyAj29HfpnubDEROAzYXLZAiPh92Ao50WOXR87h?=
 =?us-ascii?Q?VDJKvC+m6Gzcn2oYuYfXpf36UvH/aynEbMGVrz8HAOBAqrr894RIZKoi9Sw9?=
 =?us-ascii?Q?DomasBBN+/0Fah82PtXTrZ82QpfTgrUYnqKUTE1HliXyHdIq9PWUD6eUDFYn?=
 =?us-ascii?Q?3IFOInFXlxIfxjQcjBfnB803UC6k9+CoQnTTSfeNE3hN+/NgfCkBc22VlETp?=
 =?us-ascii?Q?TLAJcTMMl0l5xiq23tckwza+jnvh4Sb5aspXeRNN?=
X-OriginatorOrg: Nvidia.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 6554cbeb-2081-4f27-2a34-08db2fa4e21b
X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Mar 2023 15:55:41.9036
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: KtRsMddcD5qLkpI3LXE7cfoZqPtpk5BhWLduUpLKFF02jQkyyGOW093UwNi9cogx
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4257
X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO,
        RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE
        autolearn=unavailable autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, Mar 28, 2023 at 08:31:10AM -0700, Jacob Pan wrote:

> > this would be future proof when the same driver starts to allocate
> > more pasids for other usages e..g siov.
> I don't have strong preference here. Jason and others?

Oh I'm all for getting the word SVA out of the PASID infrastructure.

SVA has nothing to do with PASID other than it requires it to work.

Jason