linux-kernel - Re: [PATCH 7/7] vfio/pci: Remove map-on-fault behavior

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Message-ID: <YRL9TmcGcLMRHlgO@t490s>
Date:   Tue, 10 Aug 2021 18:27:26 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     Jason Gunthorpe <jgg@...dia.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 7/7] vfio/pci: Remove map-on-fault behavior

On Tue, Aug 10, 2021 at 03:45:12PM -0600, Alex Williamson wrote:
> On Tue, 10 Aug 2021 16:54:19 -0400
> Peter Xu <peterx@...hat.com> wrote:
> 
> > On Thu, Aug 05, 2021 at 11:08:21AM -0600, Alex Williamson wrote:
> > > diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
> > > index 0aa542fa1e26..9aedb78a4ae3 100644
> > > --- a/drivers/vfio/pci/vfio_pci_private.h
> > > +++ b/drivers/vfio/pci/vfio_pci_private.h
> > > @@ -128,6 +128,7 @@ struct vfio_pci_device {
> > >  	bool			needs_reset;
> > >  	bool			nointx;
> > >  	bool			needs_pm_restore;
> > > +	bool			zapped_bars;  
> > 
> > Would it be nicer to invert the meaning of "zapped_bars" and rename it to
> > "memory_enabled"?  Thanks,
> 
> I think this has it's own down sides, for example is this really less
> confusing?:
> 
>   if (!vdev->memory_enabled && __vfio_pci_memory_enabled(vdev))

Maybe "memory_enabled_last"?  No strong opinion, especially for namings. :)
zapped_bars still looks okay to me.  Thanks,

-- 
Peter Xu