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From: Halil Pasic <pasic@linux.ibm.com>
To: Cornelia Huck <cohuck@redhat.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: Fri, 7 Jun 2019 18:06:30 +0200
Message-ID: <20190607180630.7e8e24d4.pasic@linux.ibm.com> (raw)
In-Reply-To: <20190524121106.16e08562.cohuck@redhat.com>

On Fri, 24 May 2019 12:11:06 +0200
Cornelia Huck <cohuck@redhat.com> wrote:

> On Thu, 23 May 2019 17:20:01 -0600
> Alex Williamson <alex.williamson@redhat.com> wrote:
> 
> > Hi,
> > 

[..]

> > 
> > It would be really useful if s390 folks could help me understand
> > whether it's possible to glean all the information necessary to
> > recreate a ccw or ap mdev device from sysfs.  I expect the file where
> > we currently only store the mdev_type to evolve into something that
> > includes more information to facilitate more complicated devices.  For
> > now I make no claims to maintaining compatibility of recorded mdev
> > devices, it will absolutely change, but I didn't want to get bogged
> > down in making sure I don't accidentally source a root kit hidden in an
> > mdev config file.
> 
> I played a bit with it on my LPAR, and it is at least not obviously
> broken with vfio-ccw :) I don't have any ap devices to play with,
> though.
> 

Sorry for being late...

I guess for vfio-ccw one needs to make sure that the ccw device is bound
to the vfio-ccw driver first, and only after that can one use  
create-mdev to create the mdev on top of the subchannel.

So to make this work persistently (survive a reboot) one would need to
take care of the subchannel getting bound to the right vfio_ccw driver
before mdevctl is called. Right?

BTW how does this concurrence situation between the drivers io_subchannel
and vfio_ccw work? Especially if both are build in?

> > 
> > I'm also curious how or if libvirt or openstack might use this.  If
> > nothing else, it makes libvirt hook scripts easier to write, especially
> > if we add an option not to autostart mdevs, or if users don't mind
> > persistent mdevs, maybe there's nothing more to do.
> > 

+1

@Alex: I'm curious what is the big management picture for non-auto looks
like.

Regards,
Halil

[..]


  parent 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 [this message]
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
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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