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;
Received-SPF: Pass (protection.outlook.com: domain of xilinx.com designates
 149.199.62.198 as permitted sender) receiver=protection.outlook.com;
 client-ip=149.199.62.198; helo=xsj-pvapexch02.xlnx.xilinx.com;
Envelope-to: eperezma@redhat.com,
 jasowang@redhat.com,
 mst@redhat.com,
 lingshan.zhu@intel.com,
 sgarzare@redhat.com,
 xieyongji@bytedance.com,
 elic@nvidia.com,
 si-wei.liu@oracle.com,
 parav@nvidia.com,
 longpeng2@huawei.com,
 virtualization@lists.linux-foundation.org,
 linux-kernel@vger.kernel.org,
 kvm@vger.kernel.org,
 netdev@vger.kernel.org
From:   Gautam Dawar <gautam.dawar@xilinx.com>
CC:     <gdawar@xilinx.com>, <martinh@xilinx.com>, <hanand@xilinx.com>,
        <tanujk@xilinx.com>, <eperezma@redhat.com>,
        Jason Wang <jasowang@redhat.com>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Zhu Lingshan <lingshan.zhu@intel.com>,
        Stefano Garzarella <sgarzare@redhat.com>,
        Xie Yongji <xieyongji@bytedance.com>,
        Eli Cohen <elic@nvidia.com>,
        Si-Wei Liu <si-wei.liu@oracle.com>,
        Parav Pandit <parav@nvidia.com>,
        Longpeng <longpeng2@huawei.com>,
        <virtualization@lists.linux-foundation.org>,
        <linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>,
        <netdev@vger.kernel.org>
Subject: [RFC PATCH v2 11/19] vhost-vdpa: introduce uAPI to get the number of virtqueue groups
Date:   Fri, 25 Feb 2022 02:52:51 +0530
Message-ID: <20220224212314.1326-12-gdawar@xilinx.com>
In-Reply-To: <20220224212314.1326-1-gdawar@xilinx.com>
References: <20201216064818.48239-1-jasowang@redhat.com>
 <20220224212314.1326-1-gdawar@xilinx.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2022 21:26:50.7525
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: bdacefd3-97ee-4d58-8900-08d9f7dc5eff
X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch02.xlnx.xilinx.com]
X-MS-Exchange-CrossTenant-AuthSource: DM3NAM02FT032.eop-nam02.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR02MB4605
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,
        T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
To:     unlisted-recipients:; (no To-header on input)
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Follows the vDPA support for multiple address spaces, this patch
introduce uAPI for the userspace to know the number of virtqueue
groups supported by the vDPA device.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Gautam Dawar <gdawar@xilinx.com>
---
 drivers/vhost/vdpa.c       | 4 ++++
 include/uapi/linux/vhost.h | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 4e8b7c4809cd..7a8a99cef8a4 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -538,6 +538,10 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
 	case VHOST_VDPA_GET_VRING_NUM:
 		r = vhost_vdpa_get_vring_num(v, argp);
 		break;
+	case VHOST_VDPA_GET_GROUP_NUM:
+		r = copy_to_user(argp, &v->vdpa->ngroups,
+				 sizeof(v->vdpa->ngroups));
+		break;
 	case VHOST_SET_LOG_BASE:
 	case VHOST_SET_LOG_FD:
 		r = -ENOIOCTLCMD;
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index 59c6c0fbaba1..8a4e6e426bbf 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -145,4 +145,7 @@
 /* Get the valid iova range */
 #define VHOST_VDPA_GET_IOVA_RANGE	_IOR(VHOST_VIRTIO, 0x78, \
 					     struct vhost_vdpa_iova_range)
+/* Get the number of virtqueue groups. */
+#define VHOST_VDPA_GET_GROUP_NUM	_IOR(VHOST_VIRTIO, 0x79, unsigned int)
+
 #endif
-- 
2.25.0