netdev - [PATCH v2 14/19] vhost-vdpa: introduce uAPI to set group ASID

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Date:   Wed, 30 Mar 2022 23:33:54 +0530
From:   Gautam Dawar <gautam.dawar@...inx.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, <kvm@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <martinh@...inx.com>, <hanand@...inx.com>, <martinpo@...inx.com>,
        <pabloc@...inx.com>, <dinang@...inx.com>, <tanuj.kamde@....com>,
        <habetsm.xilinx@...il.com>, <ecree.xilinx@...il.com>,
        <eperezma@...hat.com>, Gautam Dawar <gdawar@...inx.com>,
        Wu Zongyong <wuzongyong@...ux.alibaba.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Eli Cohen <elic@...dia.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Xie Yongji <xieyongji@...edance.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        Parav Pandit <parav@...dia.com>,
        Longpeng <longpeng2@...wei.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Zhang Min <zhang.min9@....com.cn>
Subject: [PATCH v2 14/19] vhost-vdpa: introduce uAPI to set group ASID

Follows the vDPA support for associating ASID to a specific virtqueue
group. This patch adds a uAPI to support setting them from userspace.

Signed-off-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Gautam Dawar <gdawar@...inx.com>
---
 drivers/vhost/vdpa.c       | 8 ++++++++
 include/uapi/linux/vhost.h | 7 +++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index aa5cacdc5263..6c7ee0f18892 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -473,6 +473,14 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
 		else if (copy_to_user(argp, &s, sizeof(s)))
 			return -EFAULT;
 		return 0;
+	case VHOST_VDPA_SET_GROUP_ASID:
+		if (copy_from_user(&s, argp, sizeof(s)))
+			return -EFAULT;
+		if (s.num >= vdpa->nas)
+			return -EINVAL;
+		if (!ops->set_group_asid)
+			return -EOPNOTSUPP;
+		return ops->set_group_asid(vdpa, idx, s.num);
 	case VHOST_GET_VRING_BASE:
 		r = ops->get_vq_state(v->vdpa, idx, &vq_state);
 		if (r)
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index 668914c87f74..cab645d4a645 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -164,4 +164,11 @@
  */
 #define VHOST_VDPA_GET_VRING_GROUP	_IOWR(VHOST_VIRTIO, 0x7B,	\
 					      struct vhost_vring_state)
+/* Set the ASID for a virtqueue group. The group index is stored in
+ * the index field of vhost_vring_state, the ASID associated with this
+ * group is stored at num field of vhost_vring_state.
+ */
+#define VHOST_VDPA_SET_GROUP_ASID	_IOW(VHOST_VIRTIO, 0x7C, \
+					     struct vhost_vring_state)
+
 #endif
-- 
2.30.1