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Re: [Qemu-devel] [PATCH 2/10] Allow the monitor to be suspended during n

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH 2/10] Allow the monitor to be suspended during non-blocking op
Date: Wed, 10 Sep 2008 08:07:42 -0500
User-agent: Thunderbird (X11/20080723)

Avi Kivity wrote:
Anthony Liguori wrote:
Live migration happens in the background, but it is useful to make the monitor
command appear as if it's blocking.  This allows a management tool to
immediately know when the live migration has completed without having to poll
the migration status.

This patch allows the monitor to be suspended from a monitor callback which
will prevent new monitor commands from being executed.

This means that migration is no longer transparent. While migration is going on, you can't change the cdrom media, look at cpu registers, or do anything that requires the monitor.

On my TODO list is adding a '-d' option like we have in the KVM tree. It'll be there before it gets committed.


Anthony Liguori

This both reduces the functionality and complicates management applications. IMO migration should have asynchronous notification (and no, I don't think multiple monitors is the correct solution).

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