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From: Cornelia Huck <cohuck@redhat.com>
To: Halil Pasic <pasic@linux.ibm.com>
Cc: "Alex Williamson" <alex.williamson@redhat.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"Libvirt Devel" <libvir-list@redhat.com>,
	"Kirti Wankhede" <kwankhede@nvidia.com>,
	"Erik Skultety" <eskultet@redhat.com>,
	"Pavel Hrdina" <phrdina@redhat.com>,
	"Daniel P. Berrangé" <berrange@redhat.com>,
	"Sylvain Bauza" <sbauza@redhat.com>
Subject: Re: mdevctl: A shoestring mediated device management and persistence utility
Date: Thu, 13 Jun 2019 12:02:39 +0200
Message-ID: <20190613120239.3a78b076.cohuck@redhat.com> (raw)
In-Reply-To: <20190612175434.54e196e2.pasic@linux.ibm.com>

On Wed, 12 Jun 2019 17:54:34 +0200
Halil Pasic <pasic@linux.ibm.com> wrote:

> On Wed, 12 Jun 2019 09:14:39 +0200
> Cornelia Huck <cohuck@redhat.com> wrote:

> > Ok, looked at driverctl. Extending this one for non-PCI seems like a
> > reasonable path. However, we would also need to extend any non-PCI
> > device type we want to support with a driver_override attribute like
> > you did for PCI in 782a985d7af26db39e86070d28f987cad2 -- so this is
> > only for newer kernels. Adding that attribute for subchannels looks
> > feasible at a glance, but I have not tried to actually do it :)
> > 
> > Halil, do you think that would make sense?  
> 
> Looks doable. Did not quite figure out the details yet, but it seems
> that for PCI driver_override has more benefits than for cio (compared
> to simple unbind/bind), as matching and probing seems to be more
> elaborate for PCI. The benefit I see are
> 1) the ability to exclude the device form driver binding, and
> 2) having the same mechanism and thus consistent experience for pci and
> cio.

Yes, we should provide the same mechanism, even if it is much simpler
for the css bus.

> 
> What we IMHO should not do is make driver_override the override the
> sch->st == id->type check.

Agreed. The number of possible ids is much lower on the css bus, and a
driver wanting to match to any device may simply specify all of them
(not that this looks very useful).

I'm currently playing with this change; will send out a patch when I
have it in reasonable shape.

> 
> Regards,
> Halil
> 
> > 
> > [This might also help with the lcs vs. ctc confusion on a certain 3088
> > cu model if this is added for ccw devices as well; but I'm not sure if
> > these are still out in the wild at all. Probably not worth the effort
> > for that.]  
> 


  reply index

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-23 23:20 Alex Williamson
2019-05-24 10:11 ` Cornelia Huck
2019-05-24 14:43   ` Alex Williamson
2019-06-07 16:06   ` Halil Pasic
2019-06-11 19:45     ` Cornelia Huck
2019-06-11 20:28       ` Alex Williamson
2019-06-12  7:14         ` Cornelia Huck
2019-06-12 15:54           ` Halil Pasic
2019-06-13 10:02             ` Cornelia Huck [this message]
2019-06-12 15:07       ` Halil Pasic
2019-06-13 16:17 ` Christophe de Dinechin
2019-06-13 16:35   ` Alex Williamson
2019-06-14  9:54     ` [libvirt] " Christophe de Dinechin
2019-06-14 14:23       ` Alex Williamson
2019-06-14 15:06         ` Christophe de Dinechin
2019-06-14 16:04           ` Alex Williamson
2019-06-17 16:03             ` Cornelia Huck
2019-06-17 14:00 ` Daniel P. Berrangé
2019-06-17 14:54   ` Alex Williamson
2019-06-17 15:10     ` Daniel P. Berrangé
2019-06-17 17:05       ` Alex Williamson
2019-06-18  8:44         ` Daniel P. Berrangé
2019-06-18 11:01         ` Cornelia Huck
     [not found]           ` <CALOCmukPWiXiM+mN0hCTvSwfdHy5UdERU8WnvOXiBrMQ9tH3VA@mail.gmail.com>
2019-06-18 22:12             ` Alex Williamson
2019-06-19  7:28               ` Daniel P. Berrangé
2019-06-19  9:46                 ` Cornelia Huck
2019-06-19 18:46                   ` Alex Williamson
2019-06-20  8:24                     ` Daniel P. Berrangé
     [not found]               ` <CALOCmu=6Xmw-_-SVXujCEcgPY2CQiBQKgfUMJ45WnZ_9XORyUw@mail.gmail.com>
2019-06-19  9:57                 ` Cornelia Huck
2019-06-19 19:53                 ` Alex Williamson
2019-06-25 22:52 ` Alex Williamson
2019-06-26  9:58   ` Cornelia Huck
2019-06-26 14:37     ` Alex Williamson
2019-06-27  1:53       ` Alex Williamson
2019-06-27 12:26         ` Cornelia Huck
2019-06-27 15:00           ` Matthew Rosato
2019-06-27 15:38             ` Alex Williamson
2019-06-27 16:13               ` Matthew Rosato
2019-06-27 21:15               ` Alex Williamson
2019-06-28  1:57                 ` Alex Williamson
2019-06-28  9:06                   ` Cornelia Huck
2019-06-28 14:01                     ` Matthew Rosato
2019-06-28 17:05                     ` Alex Williamson
2019-07-01  8:20                       ` Cornelia Huck
2019-07-01 14:40                         ` Alex Williamson
2019-07-01 17:13                           ` Cornelia Huck

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