On 11/16/2010 10:59 AM, Alexander Graf wrote:
Surely, only if it is running on a Xen Dom0. If you use -M xenpv on a KVM
host, then -M xenpv should imply -machine accel=kvm (ie it would be using
xenner)
Actually, it should imply -machine accel=kvm,tcg :). Accelerators really are
not a machine property. In an ideal world, -M pc would just work with xen hvm
if -accel xen is given.
No, an accelerator is both a CPU selection and a machine
characteristic. For KVM, we overload -cpu to modify both the KVM CPU
and the TCG CPU both this won't work with accel=xen. We probably
shouldn't do this with KVM either because there's a significant
different between trying to do cpuid masking with KVM and modifying the
TCG cpu emulation support.
Both KVM and Xen have other impacts on the platform devices though. KVM
does not support SMM so it disables that in the i440fx. KVM prefers to
use it's own in-kernel local APIC (and IOAPIC). That makes it a
property of the machine.
Regards,
Anthony Liguori
Alex
