Re: [Qemu-devel] [PATCH 14/17] add new RanState RAN_STATE_FLIPPING_MIGRATE

[Paolo Bonzini]

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Il 22/10/2013 04:51, Eric Blake ha scritto:
> 
> Last time we added a new user-visible runstate, it broke migration
> with older libvirt versions that weren't prepared to see the new
> state (hmm, I need to check if libvirt has fixed that in the
> meantime; adding a cc...).  Paolo's advice at the time was that it
> is okay to require a new libvirt when using a new qemu, and that
> libvirt should be taught to treat all unknown RunState as if they
> were 'running'; although for this particular addition it might be
> nicer to have libvirt lump 'inmigrate' and 'flipping-migrate' to
> the same usage.

This is not a problem in this case, because the new runstate will only
appear after enabling a new migration capability.  Only new libvirt
will be able to enable the capability and thus reach the new runstate.

Poalo
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