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Re: [Qemu-devel] [RFC 0/2] Attempt to implement the standby feature for

From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [RFC 0/2] Attempt to implement the standby feature for assigned network devices
Date: Fri, 7 Dec 2018 13:26:10 -0500

On Fri, Dec 07, 2018 at 04:46:29PM +0000, Daniel P. Berrangé wrote:
> I'm not convinced it is useful enough to justify playing games in qdev
> with dynamically hiding devices. This adds complexity to the code which
> will make it harder to maintain and debug at runtime.

I actually think a hidden device is a useful concept to model.
E.g. you can have a powered off slot and a PCI device in
such a slot isn't visible but isn't gone either.

Right now we force-eject such devices.

But it sounds reasonable that e.g. a bunch of guests cooperate
and share an assigned device and then whoever wants to
use it, powers it up. These patches do not implement this
of course but it's a step in that direction.


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