linux-kernel - [RFC PATCH v2 12/19] vhost-vdpa: introduce uAPI to get the number of address spaces

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Date:   Fri, 25 Feb 2022 02:52:52 +0530
From:   Gautam Dawar <gautam.dawar@...inx.com>
To:     unlisted-recipients:; (no To-header on input)
CC:     <gdawar@...inx.com>, <martinh@...inx.com>, <hanand@...inx.com>,
        <tanujk@...inx.com>, <eperezma@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Xie Yongji <xieyongji@...edance.com>,
        Eli Cohen <elic@...dia.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        Parav Pandit <parav@...dia.com>,
        Longpeng <longpeng2@...wei.com>,
        <virtualization@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
        <netdev@...r.kernel.org>
Subject: [RFC PATCH v2 12/19] vhost-vdpa: introduce uAPI to get the number of address spaces

This patch introduces the uAPI for getting the number of address
spaces supported by this vDPA device.

Signed-off-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Gautam Dawar <gdawar@...inx.com>
---
 drivers/vhost/vdpa.c       | 3 +++
 include/uapi/linux/vhost.h | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 7a8a99cef8a4..733b305c5029 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -542,6 +542,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
 		r = copy_to_user(argp, &v->vdpa->ngroups,
 				 sizeof(v->vdpa->ngroups));
 		break;
+	case VHOST_VDPA_GET_AS_NUM:
+		r = copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas));
+		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 8a4e6e426bbf..8762911a3cb8 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -148,4 +148,6 @@
 /* Get the number of virtqueue groups. */
 #define VHOST_VDPA_GET_GROUP_NUM	_IOR(VHOST_VIRTIO, 0x79, unsigned int)
 
+/* Get the number of address spaces. */
+#define VHOST_VDPA_GET_AS_NUM		_IOR(VHOST_VIRTIO, 0x7A, unsigned int)
 #endif
-- 
2.25.0