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(a)linux.vnet.ibm.com wrote: >> From: "Michael R. Hines" <mrhines(a)us.ibm.com&gt; >> >> 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