Chris said, and I agree, that we should try to get the basic PV-ops infrastructure stuff into 2.6.19. To me this means being able to run a kernel native with CONFIG_PARAVIRT, and see little or no functional or performance degradation. What do we need to do to get there: * fix the slowdown bug, which seems to be something to do with rdmsr/wrmsr on SMP systems * work out how to handle all the low-level system interfaces, like ACPI, PnP BIOS, APM * what else? The system interfaces question is interesting. I'm assuming that if we're running under a hypervisor, all those interfaces are either missing or (later) virtualized - ie, the hypervisor deals with them. But we still need to do that stuff running native, so the pv-ops interface needs to have a way of selectively enabling them. Or maybe it doesn't; will those pieces of code lie there passively if they're not poked? J