On Mon, Sep 26, 2016 at 11:01:58AM -0700, Stephen Hemminger wrote: > I assume that if using Version 1 that the bit will be ignored >
Therein lies a problem. If dpdk tweaks flags, updating it will break guest migration. One way is to require that users specify all flags fully when creating the virtio net device. QEMU could verify that all required flags are set, and fail init if not. This has other advantages, e.g. it adds ability to init device without waiting for dpdk to connect. However, enabling each new feature would now require management work. How about dpdk ships the list of supported features instead? Management tools could read them on source and destination and select features supported on both sides. -- MST
