linux-kernel - RE: [PATCH 3/4] VFIO: pci: amend vfio-pci for explicit binding via sysfs only

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Message-ID: <6A3DF150A5B70D4F9B66A25E3F7C888D071CDC4A@039-SN2MPN1-013.039d.mgd.msft.net>
Date:	Thu, 24 Oct 2013 11:32:42 +0000
From:	Bhushan Bharat-R65777 <R65777@...escale.com>
To:	Kim Phillips <kim.phillips@...aro.org>,
	Wood Scott-B07421 <B07421@...escale.com>
CC:	Wood Scott-B07421 <B07421@...escale.com>,
	Yoder Stuart-B08248 <B08248@...escale.com>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"a.motakis@...tualopensystems.com" <a.motakis@...tualopensystems.com>,
	"agraf@...e.de" <agraf@...e.de>,
	Sethi Varun-B16395 <B16395@...escale.com>,
	"peter.maydell@...aro.org" <peter.maydell@...aro.org>,
	"santosh.shukla@...aro.org" <santosh.shukla@...aro.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: RE: [PATCH 3/4] VFIO: pci: amend vfio-pci for explicit binding via
 sysfs only



> -----Original Message-----
> From: Kim Phillips [mailto:kim.phillips@...aro.org]
> Sent: Saturday, October 12, 2013 4:47 AM
> To: Wood Scott-B07421
> Cc: Bhushan Bharat-R65777; Wood Scott-B07421; Yoder Stuart-B08248;
> christoffer.dall@...aro.org; alex.williamson@...hat.com; linux-
> kernel@...r.kernel.org; a.motakis@...tualopensystems.com; agraf@...e.de; Sethi
> Varun-B16395; peter.maydell@...aro.org; santosh.shukla@...aro.org;
> kvm@...r.kernel.org; gregkh@...uxfoundation.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@...escale.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@...aro.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?

Hello Kim,

I can test that we can get rid of new_id and use "bind" to bind the device to vfio_pci.

Other thing is generating hotplug, or reorder the driver registration by tweaking Makefile to test sysfs_bind_only way to bind is not yet tested.


Thanks
-Bharat

> 
> Kim
> 
> From a8d6c12f2ec763c2ac7fd384a3397c370cc1b932 Mon Sep 17 00:00:00 2001
> From: Kim Phillips <kim.phillips@...aro.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@...aro.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)
> --
> 1.8.4


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