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Re: [Qemu-block] [PATCH v2 0/9] block: -device drive=<node-name> fixes

From: Kevin Wolf
Subject: Re: [Qemu-block] [PATCH v2 0/9] block: -device drive=<node-name> fixes
Date: Mon, 17 Jul 2017 13:31:42 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

Am 13.07.2017 um 13:41 hat Kevin Wolf geschrieben:
> Since 2.9 it is possible for a user to care only about nodes and qdev devices,
> but not about BlockBackends, by defining with -blockdev and using their node
> name in -device. Devices create an anonymous BlockBackend internally then.
> One of the major problems in this setup is that such devices are not listed in
> query-block or HMP 'info block' because the BBs are not monitor-owned. A 
> recent
> discussion concluded that we really want to replace query-block and friends
> with something that matches QEMU's internals better, but there's no way to do
> that in 2.10 (and I wouldn't bet on it to be completed for 2.11). So for now,
> just make the devices appear in query-block and add the qdev ID there in order
> to make the devices identifiable (they have 'device': '' because the BB is
> anonymous).
> With the additional qdev field, it turned out that with empty drives, ide-cd
> and scsi-cd weren't even properly attached to the BlockBackend. If you do it
> right, this even results in crashes. (Floppy already gets it right, in case 
> you
> wondered.)
> After this series, -device drive=<node-name> should be reasonably usable
> without a major loss of functionality like before.

Applied to the block branch.


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