linux-kernel - Re: [PATCH v6 0/6] vhost: Add support of kthread API

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Message-ID: <CAPpAL=wQY3uknaDSiW_AJV4inkC5speMnvO0dGc3+NojK9TXng@mail.gmail.com>
Date: Mon, 24 Feb 2025 23:13:38 +0800
From: Lei Yang <leiyang@...hat.com>
To: Cindy Lu <lulu@...hat.com>
Cc: jasowang@...hat.com, mst@...hat.com, michael.christie@...cle.com, 
	sgarzare@...hat.com, linux-kernel@...r.kernel.org, 
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH v6 0/6] vhost: Add support of kthread API

I tested this series of patches with virtio-net regression tests,
everything works fine.

Tested-by: Lei Yang <leiyang@...hat.com>


On Sun, Feb 23, 2025 at 11:41 PM Cindy Lu <lulu@...hat.com> wrote:
>
> In commit 6e890c5d5021 ("vhost: use vhost_tasks for worker threads"),
> the vhost now uses vhost_task and operates as a child of the
> owner thread. This aligns with containerization principles.
> However, this change has caused confusion for some legacy
> userspace applications. Therefore, we are reintroducing
> support for the kthread API.
>
> In this series, a new UAPI is implemented to allow
> userspace applications to configure their thread mode.
>
> Changelog v2:
>  1. Change the module_param's name to enforce_inherit_owner, and the default value is true.
>  2. Change the UAPI's name to VHOST_SET_INHERIT_FROM_OWNER.
>
> Changelog v3:
>  1. Change the module_param's name to inherit_owner_default, and the default value is true.
>  2. Add a structure for task function; the worker will select a different mode based on the value inherit_owner.
>  3. device will have their own inherit_owner in struct vhost_dev
>  4. Address other comments
>
> Changelog v4:
>  1. remove the module_param, only keep the UAPI
>  2. remove the structure for task function; change to use the function pointer in vhost_worker
>  3. fix the issue in vhost_worker_create and vhost_dev_ioctl
>  4. Address other comments
>
> Changelog v5:
>  1. Change wakeup and stop function pointers in struct vhost_worker to void.
>  2. merging patches 4, 5, 6 in a single patch
>  3. Fix spelling issues and address other comments.
>
> Changelog v6:
>  1. move the check of VHOST_NEW_WORKER from vhost_scsi to vhost
>  2. Change the ioctl name VHOST_SET_INHERIT_FROM_OWNER to VHOST_FORK_FROM_OWNER
>  3. reuse the function __vhost_worker_flush
>  4. use a ops sturct to support worker relates function
>  5. reset the value of inherit_owner in vhost_dev_reset_owner
>
> Tested with QEMU with kthread mode/task mode/kthread+task mode
>
> Cindy Lu (6):
>   vhost: Add a new parameter in vhost_dev to allow user select kthread
>   vhost: Reintroduce vhost_worker to support kthread
>   vhost: Add the cgroup related function
>   vhost: introduce worker ops to support multiple thread models
>   vhost: Add new UAPI to support change to task mode
>   vhost: Add check for inherit_owner status
>
>  drivers/vhost/vhost.c      | 227 +++++++++++++++++++++++++++++++++----
>  drivers/vhost/vhost.h      |  13 +++
>  include/uapi/linux/vhost.h |  18 +++
>  3 files changed, 234 insertions(+), 24 deletions(-)
>
> --
> 2.45.0
>
>