Add a new UAPI to support setting the vhost device to
use kthread mode. The user space application needs to use
VHOST_SET_USE_KTHREAD to set the mode. This setting must
be set before VHOST_SET_OWNER is set.
Signed-off-by: Cindy Lu <lulu@xxxxxxxxxx>
---
drivers/vhost/vhost.c | 11 ++++++++++-
include/uapi/linux/vhost.h | 2 ++
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 0a7b2999100f..d6b71bddc272 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -2340,14 +2340,23 @@ long vhost_dev_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp)
{
struct eventfd_ctx *ctx;
u64 p;
- long r;
+ long r = 0;
int i, fd;
+ bool kthread;
/* If you are not the owner, you can become one */
if (ioctl == VHOST_SET_OWNER) {
r = vhost_dev_set_owner(d);
goto done;
}
+ if (ioctl == VHOST_SET_USE_KTHREAD) {
+ if (copy_from_user(&kthread, argp, sizeof(kthread))) {
+ r = -EFAULT;
+ goto done;
+ }
+ use_kthread = kthread;
+ goto done;
+ }
/* You must be the owner to do anything else */
r = vhost_dev_check_owner(d);
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index b95dd84eef2d..386fe735da63 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -235,4 +235,6 @@
*/
#define VHOST_VDPA_GET_VRING_SIZE _IOWR(VHOST_VIRTIO, 0x82, \
struct vhost_vring_state)
+
+#define VHOST_SET_USE_KTHREAD _IOW(VHOST_VIRTIO, 0x83, bool)
#endif
--
2.45.0
