[PATCH v3 1/9] vhost: Add a new parameter to allow user select kthread
From: Cindy Lu <hidden>
Date: 2024-11-05 07:27:09
Also in:
lkml, virtualization
Subsystem:
the rest, virtio host (vhost) · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
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 <redacted> --- 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