linux-kernel - Re: [RFC 7/7] vhost: Add new UAPI to support changing Kthread mode

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Message-ID: <ZsV17ACIEelIQuKx@infradead.org>
Date: Tue, 20 Aug 2024 22:06:52 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Cindy Lu <lulu@...hat.com>
Cc: jasowang@...hat.com, mst@...hat.com, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [RFC 7/7] vhost: Add new UAPI to support changing Kthread mode

On Mon, Aug 19, 2024 at 05:27:33PM +0800, Cindy Lu wrote:
> Add a new UAPI to support setting the vhost device to
> use kthread mode. The user space application needs to use
> VHOST_SET_USE_KTHREAD to set the mode. This setting must
> be set before VHOST_SET_OWNER is set.

Usage of an API is a complete kernel internal detail that has absolutely
no business being exposed to applications.

What is the application visible behavior that the API use is the proxy
for?