linux-kernel - Re: [PATCH] vfio/mtty: Enforce available

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Date:   Mon, 28 Jun 2021 14:09:55 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Kirti Wankhede <kwankhede@...dia.com>
Cc:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <cohuck@...hat.com>, <jgg@...dia.com>
Subject: Re: [PATCH] vfio/mtty: Enforce available_instances

On Tue, 29 Jun 2021 01:22:00 +0530
Kirti Wankhede <kwankhede@...dia.com> wrote:

> On 6/29/2021 12:26 AM, Alex Williamson wrote:
> > On Mon, 28 Jun 2021 23:19:54 +0530
> > Kirti Wankhede <kwankhede@...dia.com> wrote:
> >   
> >> On 6/26/2021 2:56 AM, Alex Williamson wrote:  
> >>> The sample mtty mdev driver doesn't actually enforce the number of
> >>> device instances it claims are available.  Implement this properly.
> >>>
> >>> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> >>> ---
> >>>
> >>> Applies to vfio next branch + Jason's atomic conversion
> >>>      
> >>
> >>
> >> Does this need to be on top of Jason's patch?  
> > 
> > Yes, see immediately above.
> >   
> >> Patch to use mdev_used_ports is reverted here, can it be changed from
> >> mdev_devices_list to mdev_avail_ports atomic variable?  
> > 
> > It doesn't revert Jason's change, it builds on it.  The patches could
> > we squashed, but there's no bug in Jason's patch that we're trying to
> > avoid exposing, so I don't see why we'd do that.
> >  
> 
> 'Squashed' is the correct word that 'revert', my bad.
> 
> >> Change here to use atomic variable looks good to me.
> >>
> >> Reviewed by: Kirti Wankhede <kwankhede@...dia.com>  
> > 
> > Thanks!  It was Jason's patch[1] that converted to use an atomic
> > though, so I'm slightly confused if this R-b is for the patch below,
> > Jason's patch, or both.  Thanks,  
> 
> I liked 'mdev_avail_ports' approach than 'mdev_used_ports' approach 
> here. This R-b is for below patch.

Got it, added.  Thanks Kirti!