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Subject[RFC PATCH 15/24] vhost-vdpa: introduce uAPI to get the number of address spaces
Date
A new uAPI is introduced for the userspace to know the address spaces
that is supported by a specific device.

Signed-off-by: Jason Wang <jasowang@redhat.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 4b8882f55bc9..4d97a59824a1 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -532,6 +532,9 @@ 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 19f1acdfe3ea..99bdf50efc50 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -145,4 +145,6 @@
/* Get the number of virtqueue groups. */
#define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x78, unsigned int)

+/* Get the number of address spaces. */
+#define VHOST_VDPA_GET_AS_NUM _IOR(VHOST_VIRTIO, 0x79, unsigned int)
#endif
--
2.20.1
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