[libvirt] Selective block device migration implementation

[Pavel Boldin]

Dear Libvirt Developers,


I'm working to implement feature request [1]. The feature request proposes
to enhance `libvirt' code so the API caller can specify which block devices
are to be migrated using e.g. parameters in the `virDomainMigrateToURI3'
call.

There is the following issues:

   1. It is obvious to identify devices to be migrated using the
   `device_name'. However, these need to be serialized in either 1) a
   comma-separated string or in 2) a set of values named like `blockdevice%d'
   with `blockdevice' value holding amount of block devices to migrate. What
   is the desired approach here? Can block device name contain commas or
   should I neglect this possibility?
   2. `libvirt' behavior in block devices migration was copied from the
   `QEMU' implementation that ignores read-only devices as well. So, `libvirt'
   code will need to pass this list to `QEMU' `migrate' QMP command and this
   argument should be implemented in the `QEMU'.


Is there any implementation advices from your side?

Pavel

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1203032
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