The vhost now uses vhost_task and workers as a child of the owner thread.
While this aligns with containerization principles,it confuses some legacy
userspace app, Therefore, we are reintroducing kthread API support.
Introduce a new parameter to enable users to choose between
kthread and task mode. This will be exposed by module_param() later.
Signed-off-by: Cindy Lu <lulu@xxxxxxxxxx>
---
drivers/vhost/vhost.c | 2 ++
drivers/vhost/vhost.h | 1 +
2 files changed, 3 insertions(+)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 9ac25d08f473..eff6acbbb63b 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -41,6 +41,7 @@ static int max_iotlb_entries = 2048;
module_param(max_iotlb_entries, int, 0444);
MODULE_PARM_DESC(max_iotlb_entries,
"Maximum number of iotlb entries. (default: 2048)");
+static bool inherit_owner_default = true;
enum {
VHOST_MEMORY_F_LOG = 0x1,
@@ -552,6 +553,7 @@ void vhost_dev_init(struct vhost_dev *dev,
dev->byte_weight = byte_weight;
dev->use_worker = use_worker;
dev->msg_handler = msg_handler;
+ dev->inherit_owner = inherit_owner_default;
init_waitqueue_head(&dev->wait);
INIT_LIST_HEAD(&dev->read_list);
INIT_LIST_HEAD(&dev->pending_list);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index bb75a292d50c..c650c4506c70 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -176,6 +176,7 @@ struct vhost_dev {
int byte_weight;
struct xarray worker_xa;
bool use_worker;
+ bool inherit_owner;
int (*msg_handler)(struct vhost_dev *dev, u32 asid,
struct vhost_iotlb_msg *msg);
};
--
2.45.0
