Tested the user application with QEMU.
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In commit 6e890c5d5021 ("vhost: use vhost_tasks for worker threads"),
vhost removed the support for the kthread API. However, there are
still situations where there is a request to use kthread.
In this PATCH, the support of kthread is added back. Additionally,
a module_param is added to enforce which mode we are using, and
a new UAPI is introduced to allow the userspace app to set the
mode they want to use.

Tested the userspace application with QEMU.

Cindy Lu (7):
  vhost: Add a new module_param for enable kthread
  vhost: Add kthread support in function vhost_worker_queue()
  vhost: Add kthread support in function vhost_workers_free()
  vhost: Add the vhost_worker to support kthread
  vhost: Add the cgroup related function
  vhost: Add kthread support in function vhost_worker_create
  vhost: Add new UAPI to support change to task mode

 drivers/vhost/vhost.c      | 246 +++++++++++++++++++++++++++++++++++--
 drivers/vhost/vhost.h      |   1 +
 include/uapi/linux/vhost.h |   2 +
 3 files changed, 240 insertions(+), 9 deletions(-)

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2.45.0