From: Christophe de Dinechin <cdupontd@redhat.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: "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>,
"Cornelia Huck" <cohuck@redhat.com>
Subject: Re: mdevctl: A shoestring mediated device management and persistence utility
Date: Thu, 13 Jun 2019 18:17:53 +0200 [thread overview]
Message-ID: <0358F503-E2C7-42DC-8186-34D1DA31F6D7@redhat.com> (raw)
In-Reply-To: <20190523172001.41f386d8@x1.home>
> On 24 May 2019, at 01:20, Alex Williamson <alex.williamson@redhat.com> wrote:
>
> Hi,
>
> Currently mediated device management, much like SR-IOV VF management,
> is largely left as an exercise for the user. This is an attempt to
> provide something and see where it goes. I doubt we'll solve
> everyone's needs on the first pass, but maybe we'll solve enough and
> provide helpers for the rest. Without further ado, I'll point to what
> I have so far:
>
> https://github.com/awilliam/mdevctl
While it’s still early, what about :
mdevctl create-mdev <parent-device> <mdev-type> [<mdev-uuid>]
where if the mdev-uuid is missing, you just run uuidgen within the script?
I sent a small PR in case you think it makes sense.
Thanks,
Christophe
>
> This is inspired by driverctl, which is also a bash utility. mdevctl
> uses udev and systemd to record and recreate mdev devices for
> persistence and provides a command line utility for querying, listing,
> starting, stopping, adding, and removing mdev devices. Currently, for
> better or worse, it considers anything created to be persistent. I can
> imagine a global configuration option that might disable this and
> perhaps an autostart flag per mdev device, such that mdevctl might
> simply "know" about some mdevs but not attempt to create them
> automatically. Clearly command line usage help, man pages, and
> packaging are lacking as well, release early, release often, plus this
> is a discussion starter to see if perhaps this is sufficient to meet
> some needs.
>
> Originally I thought about making a utility to manage both mdev and
> SR-IOV VFs all in one, but it seemed more natural to start here
> (besides, I couldn't think of a good name for the combined utility).
> If this seems useful, maybe I'll start on a vfctl for SR-IOV and we'll
> see whether they have enough synergy to become one.
>
> 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'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.
>
> BTW, feel free to clean up by bash, I'm a brute force and ignorance
> shell coder ;) Thanks,
>
> Alex
next prev parent reply other threads:[~2019-06-13 16:18 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-23 23:20 mdevctl: A shoestring mediated device management and persistence utility 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
2019-06-12 15:07 ` Halil Pasic
2019-06-13 16:17 ` Christophe de Dinechin [this message]
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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