On 07/07/2016 13:47, Borislav Petkov wrote: > On Thu, Jul 07, 2016 at 01:01:34PM +0200, Paolo Bonzini wrote: >> We'll probably add -cpu Opteron_G2_rdtscp but we will indeed do >> something like that. > > Why a separate CPU model and not change the existing ones?
Because otherwise you couldn't do live migration from new QEMU + new kernel to new QEMU + old kernel. QEMU tries to avoid requiring lockstep upgrades of QEMU and KVM (unlike for example perf). Paolo
