linux-kernel - Re: [PATCH v7 0/8] vhost: Add support of kthread API

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Message-ID: <20250321153611-mutt-send-email-mst@kernel.org>
Date: Fri, 21 Mar 2025 15:36:58 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Cindy Lu <lulu@...hat.com>
Cc: jasowang@...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 v7 0/8] vhost: Add support of kthread API

On Sun, Mar 02, 2025 at 10:32:02PM +0800, Cindy Lu 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.

This seems to be on top of an old tree.
Can you rebase pls?

> 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 s.
>  
> Changelog v7: 
>  1. add a KConfig knob to disable legacy app support
>  2. Split the changes into two patches to separately introduce the ops and add kthread support.
>  3. Utilized INX_MAX to avoid modifications in __vhost_worker_flush
>  4. Rebased on the latest kernel
>  5. Address other comments
>   
> Tested with QEMU with kthread mode/task mode/kthread+task mode
> 
> Cindy Lu (8):
>   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 vhost_worker_ops in vhost_worker
>   vhost: Reintroduce kthread mode support in vhost
>   vhost: uapi to control task mode (owner vs kthread)
>   vhost: Add check for inherit_owner status
>   vhost: Add a KConfig knob to enable IOCTL VHOST_FORK_FROM_OWNER
> 
>  drivers/vhost/Kconfig      |  15 +++
>  drivers/vhost/vhost.c      | 227 +++++++++++++++++++++++++++++++++----
>  drivers/vhost/vhost.h      |  21 ++++
>  include/uapi/linux/vhost.h |  15 +++
>  4 files changed, 259 insertions(+), 19 deletions(-)
> 
> -- 
> 2.45.0