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Thu, 7 Jul 2022 10:03:25 -0700 Date: Thu, 7 Jul 2022 10:03:23 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: "kwankhede@nvidia.com" , "corbet@lwn.net" , "hca@linux.ibm.com" , "gor@linux.ibm.com" , "agordeev@linux.ibm.com" , "borntraeger@linux.ibm.com" , "svens@linux.ibm.com" , "zhenyuw@linux.intel.com" , "Wang, Zhi A" , "jani.nikula@linux.intel.com" , "joonas.lahtinen@linux.intel.com" , "Vivi, Rodrigo" , "tvrtko.ursulin@linux.intel.com" , "airlied@linux.ie" , "daniel@ffwll.ch" , "farman@linux.ibm.com" , "mjrosato@linux.ibm.com" , "pasic@linux.ibm.com" , "vneethv@linux.ibm.com" , "oberpar@linux.ibm.com" , "freude@linux.ibm.com" , "akrowiak@linux.ibm.com" , "jjherne@linux.ibm.com" , "alex.williamson@redhat.com" , "cohuck@redhat.com" , "jgg@nvidia.com" , "hch@infradead.org" , "jchrist@linux.ibm.com" , "kvm@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-s390@vger.kernel.org" , "intel-gvt-dev@lists.freedesktop.org" , "intel-gfx@lists.freedesktop.org" , "dri-devel@lists.freedesktop.org" Subject: Re: [RFT][PATCH v2 9/9] vfio: Replace phys_pfn with pages for vfio_pin_pages() Message-ID: References: <20220706062759.24946-1-nicolinc@nvidia.com> <20220706062759.24946-10-nicolinc@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2022 17:03:30.3633 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cd61a924-e745-4df7-ad18-08da603a9e41 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.235];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT035.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4286 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 07, 2022 at 08:49:28AM +0000, Tian, Kevin wrote: > External email: Use caution opening links or attachments > > > > From: Nicolin Chen > > Sent: Wednesday, July 6, 2022 2:28 PM > > > > Most of the callers of vfio_pin_pages() want "struct page *" and the > > low-level mm code to pin pages returns a list of "struct page *" too. > > So there's no gain in converting "struct page *" to PFN in between. > > > > Replace the output parameter "phys_pfn" list with a "pages" list, to > > simplify callers. This also allows us to replace the vfio_iommu_type1 > > implementation with a more efficient one. > > worth mentioning that vfio pin is only for struct page * hence the > pfn_valid() check in gvt can be removed. Will add that. > > > > For now, also update vfio_iommu_type1 to fit this new parameter too. > > > > Signed-off-by: Nicolin Chen > > Reviewed-by: Kevin Tian Thanks for the review! 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Thu, 7 Jul 2022 10:03:25 -0700 Date: Thu, 7 Jul 2022 10:03:23 -0700 From: Nicolin Chen To: "Tian, Kevin" Subject: Re: [RFT][PATCH v2 9/9] vfio: Replace phys_pfn with pages for vfio_pin_pages() Message-ID: References: <20220706062759.24946-1-nicolinc@nvidia.com> <20220706062759.24946-10-nicolinc@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: cd61a924-e745-4df7-ad18-08da603a9e41 X-MS-TrafficTypeDiagnostic: MN2PR12MB4286:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.235; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:InfoNoRecords; CAT:NONE; SFS:(13230016)(4636009)(346002)(39860400002)(376002)(396003)(136003)(46966006)(36840700001)(40470700004)(9686003)(26005)(2906002)(40460700003)(47076005)(336012)(478600001)(40480700001)(83380400001)(82740400003)(186003)(55016003)(8676002)(81166007)(86362001)(70206006)(36860700001)(82310400005)(6862004)(8936002)(7416002)(426003)(5660300002)(54906003)(33716001)(316002)(41300700001)(70586007)(4326008)(4744005)(356005)(7406005)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2022 17:03:30.3633 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cd61a924-e745-4df7-ad18-08da603a9e41 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[12.22.5.235]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT035.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4286 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "mjrosato@linux.ibm.com" , "linux-doc@vger.kernel.org" , "airlied@linux.ie" , "dri-devel@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , "kwankhede@nvidia.com" , "vneethv@linux.ibm.com" , "agordeev@linux.ibm.com" , "hch@infradead.org" , "kvm@vger.kernel.org" , "corbet@lwn.net" , "pasic@linux.ibm.com" , "jgg@nvidia.com" , "borntraeger@linux.ibm.com" , "intel-gfx@lists.freedesktop.org" , "Wang, Zhi A" , "jjherne@linux.ibm.com" , "farman@linux.ibm.com" , "jchrist@linux.ibm.com" , "gor@linux.ibm.com" , "linux-s390@vger.kernel.org" , "hca@linux.ibm.com" , "alex.williamson@redhat.com" , "freude@linux.ibm.com" , "Vivi, Rodrigo" , "intel-gvt-dev@lists.freedesktop.org" , "akrowiak@linux.ibm.com" , "tvrtko.ursulin@linux.intel.com" , "cohuck@redhat.com" , "oberpar@linux.ibm.com" , "svens@linux.ibm.com" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Thu, Jul 07, 2022 at 08:49:28AM +0000, Tian, Kevin wrote: > External email: Use caution opening links or attachments > > > > From: Nicolin Chen > > Sent: Wednesday, July 6, 2022 2:28 PM > > > > Most of the callers of vfio_pin_pages() want "struct page *" and the > > low-level mm code to pin pages returns a list of "struct page *" too. > > So there's no gain in converting "struct page *" to PFN in between. > > > > Replace the output parameter "phys_pfn" list with a "pages" list, to > > simplify callers. This also allows us to replace the vfio_iommu_type1 > > implementation with a more efficient one. > > worth mentioning that vfio pin is only for struct page * hence the > pfn_valid() check in gvt can be removed. Will add that. > > > > For now, also update vfio_iommu_type1 to fit this new parameter too. > > > > Signed-off-by: Nicolin Chen > > Reviewed-by: Kevin Tian Thanks for the review!