netdev - Re: [PATCH v9 4/4] vhost: Add a KConfig knob to enable IOCTL VHOST_FORK_FROM

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Message-ID: <20250430052424-mutt-send-email-mst@kernel.org>
Date: Wed, 30 Apr 2025 05:27:15 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Jason Wang <jasowang@...hat.com>
Cc: Cindy Lu <lulu@...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 v9 4/4] vhost: Add a KConfig knob to enable IOCTL
 VHOST_FORK_FROM_OWNER

On Wed, Apr 30, 2025 at 11:34:49AM +0800, Jason Wang wrote:
> On Tue, Apr 29, 2025 at 6:56 PM Michael S. Tsirkin <mst@...hat.com> wrote:
> >
> > On Tue, Apr 29, 2025 at 11:39:37AM +0800, Jason Wang wrote:
> > > On Mon, Apr 21, 2025 at 11:46 AM Jason Wang <jasowang@...hat.com> wrote:
> > > >
> > > > On Mon, Apr 21, 2025 at 11:45 AM Jason Wang <jasowang@...hat.com> wrote:
> > > > >
> > > > > On Mon, Apr 21, 2025 at 10:45 AM Cindy Lu <lulu@...hat.com> wrote:
> > > > > >
> > > > > > Introduce a new config knob `CONFIG_VHOST_ENABLE_FORK_OWNER_IOCTL`,
> > > > > > to control the availability of the `VHOST_FORK_FROM_OWNER` ioctl.
> > > > > > When CONFIG_VHOST_ENABLE_FORK_OWNER_IOCTL is set to n, the ioctl
> > > > > > is disabled, and any attempt to use it will result in failure.
> > > > >
> > > > > I think we need to describe why the default value was chosen to be false.
> > > > >
> > > > > What's more, should we document the implications here?
> > > > >
> > > > > inherit_owner was set to false: this means "legacy" userspace may
> > > >
> > > > I meant "true" actually.
> > >
> > > MIchael, I'd expect inherit_owner to be false. Otherwise legacy
> > > applications need to be modified in order to get the behaviour
> > > recovered which is an impossible taks.
> > >
> > > Any idea on this?
> > >
> > > Thanks

So, let's say we had a modparam? Enough for this customer?
WDYT?

-- 
MST