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Re: [libvirt] [PATCH 0/3] qemu: libvirt RDMA live migration support



On Fri, Jul 26, 2013 at 12:16:08PM -0600, Eric Blake wrote:
> On 07/26/2013 11:47 AM, mrhines linux vnet ibm com wrote:
> > From: "Michael R. Hines" <mrhines us ibm com>
> > 
> > QEMU has in tree now planned for 1.6 support for RDMA-based live migration.
> > 
> > Changes to libvirt:
> > 1. QEMU has a new 'setup' phase in their state machine.
> > 2. Expose the 'x-rdma' migration protocol URI.
> > 3. Expose the 'x-rdma-pin-all' capability for pre-registration of memory.
> 
> The x- prefix means that the migration is still experimental; do we want
> to be codifying the use of experimental API into libvirt, or is it time
> for a patch to qemu to remove the x- prefix?  Back in the 1.5 timeframe,
> when RDMA was first proposed, the x- prefix made sense, but now that we
> are closer to qemu 1.6, and you are trying to get libvirt to drive it,
> that's a declaration of stability.

If it is an experimental API & naming, we definitely do not want to
expose that in the libvirt public API. We need to expose a stable
API for libvirt's client apps. If we can't do that until QEMU itself
is stable, then we'll have to wait.

Daniel
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