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Tsirkin" , Jason Wang , Eugenio Perez Martin , Si-Wei Liu , Saeed Mahameed , Leon Romanovsky , CC: Dragos Tatulea , , , Parav Pandit , Xuan Zhuo Subject: [PATCH vhost v3 02/16] vdpa: introduce dedicated descriptor group for virtqueue Date: Mon, 9 Oct 2023 14:23:47 +0300 Message-ID: <20231009112401.1060447-3-dtatulea@nvidia.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231009112401.1060447-1-dtatulea@nvidia.com> References: <20231009112401.1060447-1-dtatulea@nvidia.com> MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002BA4C:EE_|CH2PR12MB5002:EE_ X-MS-Office365-Filtering-Correlation-Id: cc6402e1-76f9-4edf-0852-08dbc8ba57a5 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:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230031)(4636009)(376002)(396003)(136003)(39860400002)(346002)(230922051799003)(186009)(64100799003)(451199024)(1800799009)(82310400011)(46966006)(36840700001)(40470700004)(2616005)(1076003)(426003)(26005)(336012)(40460700003)(40480700001)(36756003)(86362001)(82740400003)(7636003)(356005)(83380400001)(8676002)(4326008)(2906002)(8936002)(6666004)(478600001)(47076005)(36860700001)(66574015)(41300700001)(5660300002)(316002)(54906003)(70586007)(70206006)(110136005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Oct 2023 11:24:46.1712 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cc6402e1-76f9-4edf-0852-08dbc8ba57a5 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002BA4C.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB5002 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Si-Wei Liu In some cases, the access to the virtqueue's descriptor area, device and driver areas (precluding indirect descriptor table in guest memory) may have to be confined to a different address space than where its buffers reside. Without loss of simplicity and generality with already established terminology, let's fold up these 3 areas and call them as a whole as descriptor table group, or descriptor group for short. Specifically, in case of split virtqueues, descriptor group consists of regions for Descriptor Table, Available Ring and Used Ring; for packed virtqueues layout, descriptor group contains Descriptor Ring, Driver and Device Event Suppression structures. The group ID for a dedicated descriptor group can be obtained through a new .get_vq_desc_group() op. If driver implements this op, it means that the descriptor, device and driver areas of the virtqueue may reside in a dedicated group than where its buffers reside, a.k.a the default virtqueue group through the .get_vq_group() op. In principle, the descriptor group may or may not have same group ID as the default group. Even if the descriptor group has a different ID, meaning the vq's descriptor group areas can optionally move to a separate address space than where guest memory resides, the descriptor group may still start from a default address space, same as where its buffers reside. To move the descriptor group to a different address space, .set_group_asid() has to be called to change the ASID binding for the group, which is no different than what needs to be done on any other virtqueue group. On the other hand, the .reset() semantics also applies on descriptor table group, meaning the device reset will clear all ASID bindings and move all virtqueue groups including descriptor group back to the default address space, i.e. in ASID 0. QEMU's shadow virtqueue is going to utilize dedicated descriptor group to speed up map and unmap operations, yielding tremendous downtime reduction by avoiding the full and slow remap cycle in SVQ switching. Signed-off-by: Si-Wei Liu Acked-by: Eugenio Pérez Acked-by: Jason Wang --- include/linux/vdpa.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index 0e652026b776..d376309b99cf 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -204,6 +204,16 @@ struct vdpa_map_file { * @vdev: vdpa device * @idx: virtqueue index * Returns u32: group id for this virtqueue + * @get_vq_desc_group: Get the group id for the descriptor table of + * a specific virtqueue (optional) + * @vdev: vdpa device + * @idx: virtqueue index + * Returns u32: group id for the descriptor table + * portion of this virtqueue. Could be different + * than the one from @get_vq_group, in which case + * the access to the descriptor table can be + * confined to a separate asid, isolating from + * the virtqueue's buffer address access. * @get_device_features: Get virtio features supported by the device * @vdev: vdpa device * Returns the virtio features support by the @@ -360,6 +370,7 @@ struct vdpa_config_ops { /* Device ops */ u32 (*get_vq_align)(struct vdpa_device *vdev); u32 (*get_vq_group)(struct vdpa_device *vdev, u16 idx); + u32 (*get_vq_desc_group)(struct vdpa_device *vdev, u16 idx); u64 (*get_device_features)(struct vdpa_device *vdev); u64 (*get_backend_features)(const struct vdpa_device *vdev); int (*set_driver_features)(struct vdpa_device *vdev, u64 features);