Does KVM support live migration from an AMD host to an Intel host and back?
Yes. There may be issues on 32-bit Intel hosts which don’t support NX (or XD), but for 64-bit hosts back and forth migration should work well. Migration of 32-bit guests should work between 32-bit hosts and 64-bit hosts. If one of your hosts does not support NX, you may consider disabling NX when starting the guest on a NX-capable system. You can do it by passing “-cpu qemu64,-nx” parameter to the guest.
