Il 18/06/2013 20:56, Stefano Stabellini ha scritto: >> > >> > Ok. I guess we can have the ability to override the machine type in the VM >> > config, so you could still kick off an older qemu with a newer libxl - but >> > it sounds like the auto-discovery idea is a no-go then. > xenfv-2.0 is a bad idea, like Paolo wrote, it should be possible to just > use -M pc for HVM guests and retain -M xenpv for pv guests. > > However it seems to me that we also need a way in libxl to find out > whether QEMU is new enough for us to be able to use -M pc. > We can't just assume that users will be able to figure out the magic > rune they need to write in the VM config file to solve their VM crash at > boot problem. > > We could spawn an instance of QEMU just to figure out the QEMU version > but we certainly cannot do that every time we start a new VM. > Once we figure out the QEMU version the first time we could write it to > xenstore so that the next time we don't have to go through the same > process again.
Can you just assume that 4.4 requires QEMU 1.6 or newer? Paolo
