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Re: [RFC v3] VFIO Migration
From: |
Gerd Hoffmann |
Subject: |
Re: [RFC v3] VFIO Migration |
Date: |
Mon, 16 Nov 2020 13:48:58 +0100 |
> > In validating QEMU migration compatibility we merely compare the
> > versioned machine type.
>
> Thinking more about this, maybe the big picture is:
>
> Today the managment tool controls the variables in the migration (the
> device configuration). It has knowledge of the VMM, can set a machine
> type, apply a device configuration on top, and then migrate safely.
>
> VFIO changes this model because VMMs and management tools do not have
> knowledge of specific device implementations. The device implementation
> is a new source of variables in the migration and the management tool no
> longer has the full picture.
Well. We actually have the variables. They are device properties.
Then the qemu compat properties basically map a machine type to a
set of device properties. That way we hide the complexity inside
qemu. The management apps have to deal with the (versioned) machine
type only.
I guess now we have to decide whenever we want expose the individual
variables or whenever we want something like "profiles", i.e. basically
a set of variables with a name attached.
At the end of the day it is a complexity vs. flexibility tradeoff ...
take care,
Gerd
- Re: [RFC v3] VFIO Migration, (continued)
- Re: [RFC v3] VFIO Migration, Daniel P . Berrangé, 2020/11/11
- Re: [RFC v3] VFIO Migration, Cornelia Huck, 2020/11/12
- Re: [RFC v3] VFIO Migration, Stefan Hajnoczi, 2020/11/16
- Re: [RFC v3] VFIO Migration, Stefan Hajnoczi, 2020/11/16
- Re: [RFC v3] VFIO Migration, Daniel P . Berrangé, 2020/11/16
- Re: [RFC v3] VFIO Migration, Michael S. Tsirkin, 2020/11/16
- Re: [RFC v3] VFIO Migration, Daniel P . Berrangé, 2020/11/16
- Re: [RFC v3] VFIO Migration, Michael S. Tsirkin, 2020/11/16
- Re: [RFC v3] VFIO Migration, Daniel P . Berrangé, 2020/11/16
- Re: [RFC v3] VFIO Migration, Michael S. Tsirkin, 2020/11/16
- Re: [RFC v3] VFIO Migration,
Gerd Hoffmann <=
- Re: [RFC v3] VFIO Migration, Michael S. Tsirkin, 2020/11/16
- Re: [RFC v3] VFIO Migration, Michael S. Tsirkin, 2020/11/16
Re: [RFC v3] VFIO Migration, Alex Williamson, 2020/11/10
- Re: [RFC v3] VFIO Migration, Cornelia Huck, 2020/11/11
- Re: [RFC v3] VFIO Migration, Stefan Hajnoczi, 2020/11/11
- Re: [RFC v3] VFIO Migration, Cornelia Huck, 2020/11/11
- Re: [RFC v3] VFIO Migration, Stefan Hajnoczi, 2020/11/16
- Re: [RFC v3] VFIO Migration, Cornelia Huck, 2020/11/16
- Re: [RFC v3] VFIO Migration, Alex Williamson, 2020/11/16
- Re: [RFC v3] VFIO Migration, Dr. David Alan Gilbert, 2020/11/24