Il 30/09/2013 14:57, Alexey Kardashevskiy ha scritto: >> > Why is the option under -machine instead of -cpu? > Because it is still the same CPU and the guest will still read the real > PVR from the hardware (which it may not support but this is why we need > compatibility mode).
How do you support migration from a newer to an older CPU then? I think the guest should never see anything about the hardware CPU model. Paolo > It is possible to run QEMU with -cpu POWER8 with some old distro which > does not know about power8, it will switch to power6-compat mode, the > the user does "yum update" (or analog) and then the new kernel (with > power8 support) will do H_CAS again and this time "raw" power8 should be > selected.
