On 12/14/2010 04:44 PM, Ulrich Obergfell wrote:
> > Partial emulation is not something I like since it causes a fuzzy > kernel/user boundary. In this case, transitioning to userspace when > interrupts are enabled doesn't look so hot. Are you sure all guests > that benefit from this don't enable the pmtimer interrupt? What about > the transition? Will we have a time discontinuity when that happens? Avi, the idea is to use the '-kvm-pmtmr' option (in code part 4) only with guests that do not enable the 'timer carry interrupt'. Guests that need to enable the 'timer carry interrupt' should rather use the PM Timer emulation in qemu userspace (i.e. they should not be started with this option). If a guest is accidentally started with this option, the in-kernel PM Timer (in code part 1) detects if the guest attempts to enable the 'timer carry interrupt' and falls back to PM Timer emulation in qemu userspace (in-kernel PM Timer disables itself automatically). So, this is not a combination of in-kernel PM Timer register emulation and qemu userspace PM Timer interrupt emulation.
We really try to avoid guest specific parameters. Having to decide if the guest has virtio is bad enough, but going into low level details like that is really bad. The host admin might not even know what operating systems its guests run.
A guest might even dual boot two different operating systems. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
