From: Cornelia Huck <cohuck@redhat.com>
To: Sean Mooney <smooney@redhat.com>
Cc: Jiri Pirko <jiri@mellanox.com>, Yan Zhao <yan.y.zhao@intel.com>,
Jason Wang <jasowang@redhat.com>,
Alex Williamson <alex.williamson@redhat.com>,
kvm@vger.kernel.org, libvir-list@redhat.com,
qemu-devel@nongnu.org, kwankhede@nvidia.com, eauger@redhat.com,
xin-ran.wang@intel.com, corbet@lwn.net,
openstack-discuss@lists.openstack.org, shaohe.feng@intel.com,
kevin.tian@intel.com, eskultet@redhat.com,
jian-feng.ding@intel.com, dgilbert@redhat.com,
zhenyuw@linux.intel.com, hejie.xu@intel.com,
bao.yumeng@zte.com.cn, intel-gvt-dev@lists.freedesktop.org,
berrange@redhat.com, dinechin@redhat.com, devel@ovirt.org,
Parav Pandit <parav@mellanox.com>,
Eric Farman <farman@linux.ibm.com>
Subject: Re: device compatibility interface for live migration with assigned devices
Date: Thu, 13 Aug 2020 17:33:47 +0200 [thread overview]
Message-ID: <20200813173347.239801fa.cohuck@redhat.com> (raw)
In-Reply-To: <20200807135942.5d56a202.cohuck@redhat.com>
On Fri, 7 Aug 2020 13:59:42 +0200
Cornelia Huck <cohuck@redhat.com> wrote:
> On Wed, 05 Aug 2020 12:35:01 +0100
> Sean Mooney <smooney@redhat.com> wrote:
>
> > On Wed, 2020-08-05 at 12:53 +0200, Jiri Pirko wrote:
> > > Wed, Aug 05, 2020 at 11:33:38AM CEST, yan.y.zhao@intel.com wrote:
>
> (...)
>
> > > > software_version: device driver's version.
> > > > in <major>.<minor>[.bugfix] scheme, where there is no
> > > > compatibility across major versions, minor versions have
> > > > forward compatibility (ex. 1-> 2 is ok, 2 -> 1 is not) and
> > > > bugfix version number indicates some degree of internal
> > > > improvement that is not visible to the user in terms of
> > > > features or compatibility,
> > > >
> > > > vendor specific attributes: each vendor may define different attributes
> > > > device id : device id of a physical devices or mdev's parent pci device.
> > > > it could be equal to pci id for pci devices
> > > > aggregator: used together with mdev_type. e.g. aggregator=2 together
> > > > with i915-GVTg_V5_4 means 2*1/4=1/2 of a gen9 Intel
> > > > graphics device.
> > > > remote_url: for a local NVMe VF, it may be configured with a remote
> > > > url of a remote storage and all data is stored in the
> > > > remote side specified by the remote url.
> > > > ...
> > just a minor not that i find ^ much more simmple to understand then
> > the current proposal with self and compatiable.
> > if i have well defiend attibute that i can parse and understand that allow
> > me to calulate the what is and is not compatible that is likely going to
> > more useful as you wont have to keep maintianing a list of other compatible
> > devices every time a new sku is released.
> >
> > in anycase thank for actully shareing ^ as it make it simpler to reson about what
> > you have previously proposed.
>
> So, what would be the most helpful format? A 'software_version' field
> that follows the conventions outlined above, and other (possibly
> optional) fields that have to match?
Just to get a different perspective, I've been trying to come up with
what would be useful for a very different kind of device, namely
vfio-ccw. (Adding Eric to cc: for that.)
software_version makes sense for everybody, so it should be a standard
attribute.
For the vfio-ccw type, we have only one vendor driver (vfio-ccw_IO).
Given a subchannel A, we want to make sure that subchannel B has a
reasonable chance of being compatible. I guess that means:
- same subchannel type (I/O)
- same chpid type (e.g. all FICON; I assume there are no 'mixed' setups
-- Eric?)
- same number of chpids? Maybe we can live without that and just inject
some machine checks, I don't know. Same chpid numbers is something we
cannot guarantee, especially if we want to migrate cross-CEC (to
another machine.)
Other possibly interesting information is not available at the
subchannel level (vfio-ccw is a subchannel driver.)
So, looking at a concrete subchannel on one of my machines, it would
look something like the following:
<common>
software_version=1.0.0
type=vfio-ccw <-- would be vfio-pci on the example above
<vfio-ccw specific>
subchannel_type=0
<vfio-ccw_IO specific>
chpid_type=0x1a
chpid_mask=0xf0 <-- not sure if needed/wanted
Does that make sense?
next prev parent reply other threads:[~2020-08-13 15:34 UTC|newest]
Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-13 23:29 device compatibility interface for live migration with assigned devices Yan Zhao
2020-07-14 10:21 ` Daniel P. Berrangé
2020-07-14 12:33 ` Sean Mooney
[not found] ` <20200714110148.0471c03c@x1.home>
[not found] ` <eb705c72cdc8b6b8959b6ebaeeac6069a718d524.camel@redhat.com>
2020-07-14 21:15 ` Sean Mooney
2020-07-14 16:16 ` Alex Williamson
2020-07-14 16:47 ` Daniel P. Berrangé
2020-07-14 20:47 ` Alex Williamson
2020-07-15 9:16 ` Daniel P. Berrangé
2020-07-14 17:19 ` Dr. David Alan Gilbert
2020-07-14 20:59 ` Alex Williamson
2020-07-15 8:20 ` Yan Zhao
2020-07-15 8:49 ` Feng, Shaohe
2020-07-17 14:59 ` Alex Williamson
2020-07-17 18:03 ` Dr. David Alan Gilbert
2020-07-17 18:30 ` Alex Williamson
2020-07-15 8:23 ` Dr. David Alan Gilbert
[not found] ` <CAH7mGatPWsczh_rbVhx4a+psJXvkZgKou3r5HrEQTqE7SqZkKA@mail.gmail.com>
2020-07-17 15:18 ` Alex Williamson
2020-07-16 4:16 ` Jason Wang
2020-07-16 8:32 ` Yan Zhao
2020-07-16 9:30 ` Jason Wang
2020-07-17 16:12 ` Alex Williamson
2020-07-20 3:41 ` Jason Wang
2020-07-20 10:39 ` Sean Mooney
2020-07-21 2:11 ` Jason Wang
2020-07-21 0:51 ` Yan Zhao
2020-07-27 7:24 ` Yan Zhao
2020-07-27 22:23 ` Alex Williamson
2020-07-29 8:05 ` Yan Zhao
2020-07-29 11:28 ` Sean Mooney
2020-07-29 19:12 ` Alex Williamson
2020-07-30 3:41 ` Yan Zhao
2020-07-30 13:24 ` Sean Mooney
2020-07-30 17:29 ` Alex Williamson
2020-08-04 8:37 ` Yan Zhao
2020-08-05 9:44 ` Dr. David Alan Gilbert
2020-07-30 1:56 ` Yan Zhao
2020-07-30 13:14 ` Sean Mooney
2020-08-04 16:35 ` Cornelia Huck
2020-08-05 2:22 ` Jason Wang
2020-08-05 2:16 ` Yan Zhao
2020-08-05 2:41 ` Jason Wang
2020-08-05 7:56 ` Jiri Pirko
2020-08-05 8:02 ` Jason Wang
2020-08-05 9:33 ` Yan Zhao
2020-08-05 10:53 ` Jiri Pirko
2020-08-05 11:35 ` Sean Mooney
2020-08-07 11:59 ` Cornelia Huck
2020-08-13 15:33 ` Cornelia Huck [this message]
2020-08-13 19:02 ` Eric Farman
2020-08-17 6:38 ` Cornelia Huck
2020-08-10 7:46 ` Yan Zhao
2020-08-13 4:24 ` Jason Wang
2020-08-14 5:16 ` Yan Zhao
2020-08-14 12:30 ` Sean Mooney
2020-08-17 1:52 ` Yan Zhao
2020-08-18 3:24 ` Jason Wang
2020-08-18 8:55 ` Daniel P. Berrangé
2020-08-18 9:06 ` Cornelia Huck
2020-08-18 9:24 ` Daniel P. Berrangé
2020-08-18 9:38 ` Cornelia Huck
[not found] ` <3a073222-dcfe-c02d-198b-29f6a507b2e1@redhat.com>
2020-08-18 9:16 ` Daniel P. Berrangé
2020-08-18 9:36 ` Cornelia Huck
2020-08-18 9:39 ` Parav Pandit
2020-08-19 3:30 ` Yan Zhao
2020-08-19 5:58 ` Parav Pandit
2020-08-19 9:41 ` Jason Wang
2020-08-19 6:57 ` [ovirt-devel] " Jason Wang
2020-08-19 6:59 ` Yan Zhao
2020-08-19 7:39 ` Jason Wang
2020-08-19 8:13 ` Yan Zhao
2020-08-19 9:28 ` Jason Wang
2020-08-20 12:27 ` Cornelia Huck
2020-08-21 3:14 ` Jason Wang
2020-08-21 14:52 ` Cornelia Huck
2020-08-31 3:07 ` Jason Wang
2020-08-19 17:50 ` Alex Williamson
2020-08-20 0:18 ` Yan Zhao
2020-08-20 3:13 ` Alex Williamson
2020-08-20 3:09 ` Yan Zhao
2020-08-19 2:54 ` Jason Wang
2020-08-20 0:39 ` Yan Zhao
2020-08-20 1:29 ` Sean Mooney
2020-08-20 4:01 ` Yan Zhao
2020-08-20 5:16 ` Sean Mooney
2020-08-20 6:27 ` Yan Zhao
2020-08-20 13:24 ` Sean Mooney
2020-08-26 8:54 ` Yan Zhao
2020-08-20 3:22 ` Alex Williamson
2020-08-20 3:16 ` Yan Zhao
2020-08-25 14:39 ` Cornelia Huck
2020-08-26 6:41 ` Yan Zhao
2020-08-28 13:47 ` Cornelia Huck
2020-08-28 14:04 ` Sean Mooney
2020-08-31 4:43 ` Yan Zhao
2020-09-08 14:41 ` Cornelia Huck
2020-09-09 2:13 ` Yan Zhao
2020-09-10 12:38 ` Cornelia Huck
2020-09-10 12:50 ` Sean Mooney
2020-09-10 18:02 ` Alex Williamson
2020-09-11 0:56 ` Yan Zhao
2020-09-11 10:08 ` Cornelia Huck
2020-09-11 10:18 ` Tian, Kevin
2020-09-11 16:51 ` Alex Williamson
2020-09-14 13:48 ` Zeng, Xin
2020-09-14 14:44 ` Alex Williamson
2020-09-09 5:37 ` Yan Zhao
2020-08-31 2:23 ` Yan Zhao
2020-08-19 2:38 ` Jason Wang
2020-08-18 9:32 ` Parav Pandit
2020-08-19 2:45 ` Jason Wang
2020-08-19 5:26 ` Parav Pandit
2020-08-19 6:48 ` Jason Wang
2020-08-19 6:53 ` Parav Pandit
2020-07-29 19:05 ` Dr. David Alan Gilbert
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