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SubjectRE: [PATCH 3/4] VFIO: pci: amend vfio-pci for explicit binding via sysfs only
Date


> -----Original Message-----
> From: Kim Phillips [mailto:kim.phillips@linaro.org]
> Sent: Friday, October 11, 2013 6:17 PM
> To: Wood Scott-B07421
> Cc: Bhushan Bharat-R65777; Wood Scott-B07421; Yoder Stuart-B08248;
> christoffer.dall@linaro.org; alex.williamson@redhat.com; linux-
> kernel@vger.kernel.org; a.motakis@virtualopensystems.com; agraf@suse.de;
> Sethi Varun-B16395; peter.maydell@linaro.org; santosh.shukla@linaro.org;
> kvm@vger.kernel.org; gregkh@linuxfoundation.org
> Subject: Re: [PATCH 3/4] VFIO: pci: amend vfio-pci for explicit binding
> via sysfs only
>
> On Fri, 11 Oct 2013 15:43:40 -0500
> Scott Wood <scottwood@freescale.com> wrote:
>
> > On Fri, 2013-10-11 at 01:27 -0500, Kim Phillips wrote:
> > > Force the vfio-pci driver to only be bound explicitly via sysfs to
> avoid
> > > conflics with other drivers in the event of a hotplug.
> > >
> > > Signed-off-by: Kim Phillips <kim.phillips@linaro.org>
> > > ---
> > > drivers/vfio/pci/vfio_pci.c | 3 +++
> > > 1 file changed, 3 insertions(+)
> > >
> > > diff --git a/drivers/vfio/pci/vfio_pci.c
> b/drivers/vfio/pci/vfio_pci.c
> > > index 6ab71b9..bdd7833 100644
> > > --- a/drivers/vfio/pci/vfio_pci.c
> > > +++ b/drivers/vfio/pci/vfio_pci.c
> > > @@ -901,6 +901,9 @@ static struct pci_driver vfio_pci_driver = {
> > > .probe = vfio_pci_probe,
> > > .remove = vfio_pci_remove,
> > > .err_handler = &vfio_err_handlers,
> > > + .driver = {
> > > + .sysfs_bind_only = true,
> > > + },
> > > };
> > >
> > > static void __exit vfio_pci_cleanup(void)
> >
> > You also need to add a PCI_ANY_ID match in order to be able to get rid
> > of the new_id usage.
>
> thanks - see below.
>
> Can someone with a PCI bus test this? Bharat?
>
> Kim
>
> From a8d6c12f2ec763c2ac7fd384a3397c370cc1b932 Mon Sep 17 00:00:00 2001
> From: Kim Phillips <kim.phillips@linaro.org>
> Date: Thu, 10 Oct 2013 22:16:34 -0500
> Subject: [PATCH 3/4 v2] VFIO: pci: amend vfio-pci for explicit binding
> via sysfs
> only
>
> Force the vfio-pci driver to only be bound explicitly via sysfs to avoid
> conflics with other drivers in the event of a hotplug. Also replace
> the only dynamic ids assignment with a table with a single PCI_ANY_ID
> entry since writing the sysfs bind file without having to specify ids
> via the new_id file first should no longer be necessary.
>
> Signed-off-by: Kim Phillips <kim.phillips@linaro.org>
> ---
> drivers/vfio/pci/vfio_pci.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index 6ab71b9..c5b434f 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -895,12 +895,22 @@ static struct pci_error_handlers vfio_err_handlers
> = {
> .error_detected = vfio_pci_aer_err_detected,
> };
>
> +static DEFINE_PCI_DEVICE_TABLE(vfio_pci_id_table) = {
> + { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
> + { 0 }
> +};
> +
> +MODULE_DEVICE_TABLE(pci, vfio_pci_id_table);
> +
> static struct pci_driver vfio_pci_driver = {
> .name = "vfio-pci",
> - .id_table = NULL, /* only dynamic ids */
> + .id_table = vfio_pci_id_table, /* no dynamic ids */
> .probe = vfio_pci_probe,
> .remove = vfio_pci_remove,
> .err_handler = &vfio_err_handlers,
> + .driver = {
> + .sysfs_bind_only = true, /* bind only via sysfs */
> + },
> };
>
> static void __exit vfio_pci_cleanup(void)

sysfs bind only seems orthogonal to PCI_ANY_ID...I would have split
those into 2 different patches.

Stuart



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