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Re: [Xen-devel] Re: [Qemu-devel] [PATCH 12/13] set vnc password from xen

Daniel P. Berrange wrote:
On Thu, Aug 21, 2008 at 11:34:41PM +0200, Gerd Hoffmann wrote:
Multiple monitor instances would be very useful anyway.

Right now there is no way to use the monitor for libvirt-managed qemu
instances because libvirt uses the monitor.  Being able to both use
libvirt *and* have a monitor prompt to type commands would be great.

I disagree - that means you'll no longer be able to trust what libvirt
tells you about the VM, and libvirt won't have a guarenteed consistent
view of the VM's state because things will be changed behind its back.

A nice side effect of having multiple monitors is that you can implement a proper 'select' command. This command would block and tell you about asynchronous events (like guest CD-ROM ejecting). You could use this mechanism to notify libvirt when things changed because of other monitors too.

It's more work though from a libvirt perspective and you probably don't want users screwing around in the monitor anyway.


Anthony Liguori


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