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Re: [libvirt] Re: [Qemu-devel] [PATCH 1/6] Allow multiple monitor devices (v2)



Daniel P. Berrange wrote:
Yes indeed its a little crazy :-) As anthony mentioned if libvirt were able to be notified of changes a user makes in the monitor, there's no reason we could not allow end users to access the monitor of a VM libvirt is managing. We just need to make sure libvirt doesn't miss
changes like attaching or detaching block devices, etc, because that'll
cause crash/data loss later when libvirt migrates or does save/restore,
etc because it'll launch QEMU with wrong args

You still have an inherent race here.

user: plug in disk
libvirt: start migration, still without disk
qemu: libvirt, a disk has been plugged in.

I don't see how adding those low-level monitory things to libvirt is
an improvement - debugging and scripted keystrokes are not the sort of
functionality libvirt is for - or is it?

I think it could probably be argued that sending fake keystrokes could
be within scope. Random ad-hoc debugging probably out of scope.

That means that to debug a problem in the field you have to locate a guest's host, and follow it around as it migrates (or disable migration).

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.


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