On 03/06/13 00:12, Eric Blake wrote: > The old cpu_set HMP command "worked" in something like qemu 0.10, and > was ripped out when we realized it didn't actually work in a way that > was guaranteed to be safe to the guest. Since then, the libvirt command > has been a guaranteed failure on qemu, although it continues to work on > xen (and since it has been several YEARS now of not working, people are > laughing at qemu for not getting cpu hotplug working when xen has had it > for so long).
Under xen there's a separate comms method for requesting this (dom0 side massaging of a specific node in xenstore + xenstore watch in the guest kernel on that node). http://wiki.xen.org/wiki/XenBus http://wiki.xen.org/wiki/Event_Channel_Internals >> I'll have to test this in RHEL-6. If it doesn't work, I should check >> why. If it does, I'll have to figure out if I should continue to work on >> this. > > Yes, PLEASE continue to work on this - having the guest agent as an > alternative to ACPI has proven useful in other respects (for example, we > wired up virDomainShutdownFlags() to let the user choose between > guest-agent, ACPI, or hypervisor choice). OK. Laszlo
