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Thu, 8 May 2025 20:03:33 -0700 From: Nicolin Chen To: , , , CC: , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v4 16/23] Documentation: userspace-api: iommufd: Update HW QUEUE Date: Thu, 8 May 2025 20:02:37 -0700 Message-ID: <06b52408c31858e39a2fb557fd35f80db965f646.1746757630.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF00004FC1:EE_|PH7PR12MB5618:EE_ X-MS-Office365-Filtering-Correlation-Id: 1ad5303f-9c03-45da-75aa-08dd8ea61cb8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|7416014|36860700013|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?ktgFaDJCX30dBSPjNnpvE7kXbG0mct42WDzi1z6jLVF1PCpxsXjRlsUWqNiB?= =?us-ascii?Q?tynC9Gu1HridJGWrnZX2rFU2NTmjnZWm4QZUQoSrZXVJiHV2Ajn6ndaobktj?= =?us-ascii?Q?0FVNRLZ52Ler4/aC8CJr8kKVZ69fSohWUuvvYuoxykpwyci7tJpbJJR2BV9L?= =?us-ascii?Q?4AO5+3XFNmkXeAz8sXZjyLA0y/di1FT7OvKttLEzrx9eJM9vuCAsBaZ9/TBq?= =?us-ascii?Q?nd1RfF0/tfyorXC65RsDTkP8cuq2d7+Irk+8AmUdmW+t03U16pfSNsQ0Y8fJ?= =?us-ascii?Q?p+uHCkojofwutuSEq2dcAT9bQPqORxPKeYlXteX2iSUQNvwlrA/ndQwWG8sj?= =?us-ascii?Q?GvxvTBiblROT5QofklZxTKPVozaW0o+g0EJZlCcI3PA3gDoOuD+wrycC5VR+?= =?us-ascii?Q?6alJvWAC/5HamZ5gHdSzr/Kvt+torBjCLZajt572u6lBJgCkOxNz11fNaQDy?= =?us-ascii?Q?8cQsqa+trkqF8WQJ8CjJufLuVwXV826O3YkGZMPlAshqMUYPvHZHNTwqZTBM?= =?us-ascii?Q?Dvbf6fa9oqG6jCdPqQjITouaWDxzNUO8zM9LtAZyD73+zFDwBi9ilVYQcrCQ?= =?us-ascii?Q?w5AvP3195ECdAPi8o+mUZhD4FRtxYwEN1QG0YNTuUDlnt7j9DNskNf1O5VgH?= =?us-ascii?Q?nBsfBCghZaPRYGy6J6m0xdckUtmEQ4DGXoxGDiCBZ7NszMc+1M/1E5pq3vKJ?= =?us-ascii?Q?LUX3GG8zns4SAq1qzM/yxg7dtEnle3naOFYW6zLG2ARGOgV504HEKo/ZHU1X?= =?us-ascii?Q?1UyTGcOiO3KP5kk8sWB8rm6VeT2vZZYJl8HQN5zPLJVpH27NWoi7FUeAIEQ8?= =?us-ascii?Q?WdW3PilkEEMP7AtdVMMKqpd13+9e3EN2tO5gpwriLJmu8Y8HVzZia7hUIhZE?= =?us-ascii?Q?pn9Lz0vTP7RL136v7g0/430W80uNbzVcayspYcks4it+yJx3iCm6gMQiXl8b?= =?us-ascii?Q?p9TBgxTK6Mjbdsr8ztf7OeimecVttHCrjTR7lPm/4TZ5LZRTS8j5jopPasRo?= =?us-ascii?Q?I15GciBcW1Lh/YgtcOvKYI1ycLJWuP/NfvesteESfq0tOl38jsoLWhnL0Mx5?= =?us-ascii?Q?bggUO1j/H+Ku53FsVb8ShP6goCGl/6mQc7krXF4MsGuurodqUmcGmIIvZ26n?= =?us-ascii?Q?Fn+MJ2/vOyAxMdEiq1EwaBMNY0vjCI5J6huQec6WS8dTHYO2t2Y4TUJqgrvc?= =?us-ascii?Q?4isYm852UnIM+cdDiT5QhYf9rhq9NhPen4oQfX9ZfAgK5NU0AH3Uum8Mnbrh?= =?us-ascii?Q?Gq0y2L9k14b1WFNVTbqaWmAXiyd7xZUxZkdk+2X/6Wfn0pN2UEYSsj814im+?= =?us-ascii?Q?+vO2Unq8uI2SdkZFcc+GgQx5ZnAWR+VjxTb/xgYm94KC7GFihX2AXmOZCLNE?= =?us-ascii?Q?l8fBUSwqreHh1BP+a4ydDy1ttCo8e7pkajcihB8oQxsFsS48USXfPlsB49LP?= =?us-ascii?Q?JZF7kwm5U9j4Pe8xtpU1jnop5MLTYwugXdnCpOAkYfbj2KyvVTTj7Lf/845e?= =?us-ascii?Q?wjoav69y40eNatSPg1aFtZ87WKfi8O31HKez?= X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(1800799024)(7416014)(36860700013)(82310400026);DIR:OUT;SFP:1101; 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Signed-off-by: Nicolin Chen --- Documentation/userspace-api/iommufd.rst | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/Documentation/userspace-api/iommufd.rst b/Documentation/userspace-api/iommufd.rst index b0df15865dec..03f7510384d2 100644 --- a/Documentation/userspace-api/iommufd.rst +++ b/Documentation/userspace-api/iommufd.rst @@ -124,6 +124,17 @@ Following IOMMUFD objects are exposed to userspace: used to allocate a vEVENTQ. Each vIOMMU can support multiple types of vEVENTS, but is confined to one vEVENTQ per vEVENTQ type. +- IOMMUFD_OBJ_HW_QUEUE, representing a hardware accelerated queue, as a subset + of IOMMU's virtualization features, for the IOMMU HW to directly read or write + the virtual queue memory owned by a guest OS. This HW-acceleration feature can + allow VM to work with the IOMMU HW directly without a VM Exit, so as to reduce + overhead from the hypercalls. Along with the HW QUEUE object, iommufd provides + user space an mmap interface for VMM to mmap a physical MMIO region from the + host physical address space to the guest physical address space, allowing the + guest OS to directly control the allocated HW QUEUE. Thus, when allocating a + HW QUEUE, the VMM must request a pair of mmap info (offset/length) and pass in + exactly to an mmap syscall via its offset and length arguments. + All user-visible objects are destroyed via the IOMMU_DESTROY uAPI. The diagrams below show relationships between user-visible objects and kernel @@ -270,6 +281,7 @@ User visible objects are backed by following datastructures: - iommufd_viommu for IOMMUFD_OBJ_VIOMMU. - iommufd_vdevice for IOMMUFD_OBJ_VDEVICE. - iommufd_veventq for IOMMUFD_OBJ_VEVENTQ. +- iommufd_hw_queue for IOMMUFD_OBJ_HW_QUEUE. Several terminologies when looking at these datastructures: -- 2.43.0