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Thu, 10 Apr 2025 23:38:26 -0700 From: Nicolin Chen To: , , , CC: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v1 12/16] Documentation: userspace-api: iommufd: Update vCMDQ Date: Thu, 10 Apr 2025 23:37:51 -0700 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001F4:EE_|SA3PR12MB8812:EE_ X-MS-Office365-Filtering-Correlation-Id: 2580f8e4-3a6b-4b8e-303e-08dd78c37ebd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|376014|7416014|82310400026|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161; 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Signed-off-by: Nicolin Chen --- Documentation/userspace-api/iommufd.rst | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/userspace-api/iommufd.rst b/Documentation/userspace-api/iommufd.rst index b0df15865dec..ace0579432d5 100644 --- a/Documentation/userspace-api/iommufd.rst +++ b/Documentation/userspace-api/iommufd.rst @@ -124,6 +124,16 @@ 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_VCMDQ, representing a hardware queue as a subset of a vIOMMU's + virtualization feature for a VM to directly execute guest-issued commands to + invalidate HW cache entries holding the mappings or translations of a guest- + owned stage-1 page table. Along with this queue object, iommufd provides the + user space a new mmap interface that the VMM can mmap a physical MMIO region + from the host physical address space to a guest physical address space. To use + this mmap interface, the VMM must define an IOMMU specific driver structure + to ask for a pair of VMA info (vm_pgoff/size) to do mmap after a vCMDQ gets + allocated. + All user-visible objects are destroyed via the IOMMU_DESTROY uAPI. The diagrams below show relationships between user-visible objects and kernel @@ -270,6 +280,7 @@ 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_vcmdq for IOMMUFD_OBJ_VCMDQ. Several terminologies when looking at these datastructures: