linux-kernel - RE: [PATCH v2 02/13] vfio_pci: refine user config reference in vfio-pci module

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Date:   Mon, 30 Sep 2019 12:38:23 +0000
From:   "Liu, Yi L" <yi.l.liu@...el.com>
To:     Alex Williamson <alex.williamson@...hat.com>
CC:     "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "Sun, Yi Y" <yi.y.sun@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Zhao, Yan Y" <yan.y.zhao@...el.com>,
        "He, Shaopeng" <shaopeng.he@...el.com>,
        "Xia, Chenbo" <chenbo.xia@...el.com>,
        "Tian, Jun J" <jun.j.tian@...el.com>
Subject: RE: [PATCH v2 02/13] vfio_pci: refine user config reference in
 vfio-pci module

Hi Alex,

> From: Alex Williamson [mailto:alex.williamson@...hat.com]
> Sent: Thursday, September 26, 2019 10:36 AM
> To: Liu, Yi L <yi.l.liu@...el.com>
> Subject: Re: [PATCH v2 02/13] vfio_pci: refine user config reference in vfio-pci
> module
> 
> On Thu,  5 Sep 2019 15:59:19 +0800
> Liu Yi L <yi.l.liu@...el.com> wrote:
> 
> > This patch adds three fields in struct vfio_pci_device to pass the user
> > configs of vfio-pci module to some functions which could be common in
> > future usage.
> >
> > Cc: Kevin Tian <kevin.tian@...el.com>
> > Cc: Lu Baolu <baolu.lu@...ux.intel.com>
> > Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
> > ---
> >  drivers/vfio/pci/vfio_pci.c         | 24 +++++++++++++++---------
> >  drivers/vfio/pci/vfio_pci_private.h |  9 +++++++--
> >  2 files changed, 22 insertions(+), 11 deletions(-)
> 
> A subtle behavioral difference here is that disable_idle_d3 and
> nointxmask are runtime modifiable parameters, if the value is changed
> in sysfs the device will adopt the new behavior on its next
> transition.  After this patch, each device operates in the mode defined
> at the time it was probed.  Should we maybe refresh the value at key
> points, like the user opening or releasing the device so that it tracks
> the module parameter?  I think we could defend not changing the
> behavior of a device while it's in use by a user.  Otherwise we might
> want to make the module parameter read-only to avoid the
> inconsistency.

Agreed. I think we can take such assumption that the changing is not
allowed during an open/release cycle. Let me add the updates in the
next version.

> 
> >
[...]
> > +	vfio_pci_fill_ids(&ids[0]);
> 
> Or just 'ids'.  Thanks,

yes, let me fix it.

> Alex
> 

Regards,
Yi Liu