On 11/21/2016 07:08 AM, Andrea Bolognani wrote: >> If libvirt is using a specific version of pseries, then it already knows >> that <=2.7 has pci.0 as a root, pcie.0 otherwise. libvirt has a knowledge >> what QEMU version has what, right? > > It doesn't yet, that's the point :) > > We *could* add such knowledge to libvirt[1], but *existing* > libvirt versions would still not know about it, which means > that upgrading QEMU withough upgrading libvirt will result > in failure to create new guests.
But that's okay. In general, we try to promise that: old qemu + old libvirt works new qemu + new libvirt works old qemu + new libvirt works new qemu + old libvirt is untested, and may require a libvirt upgrade In other words, as long as you update your stack from top down (libvirt before qemu), you should be fine. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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