On Fri, Aug 30, 2019 at 06:13:45PM +0200, Laurent Vivier wrote: > When we hotplug a CPU on memory-less/cpu-less node, the linux kernel > crashes. > > This happens because linux kernel needs to know the NUMA topology at > start to be able to initialize the distance lookup table. > > On pseries, the topology is provided by the firmware via the existing > CPUs and memory information. Thus a node without memory and CPU cannot be > discovered by the kernel. > > To avoid the kernel crash, do not allow to start pseries with empty > nodes.
This describes one possible guest OS. Is there any reasonable chance that a non-Linux guest might be able to handle this situation correctly, or do you expect any guest to have the same restriction ? > Signed-off-by: Laurent Vivier <[email protected]> > --- > hw/ppc/spapr.c | 33 +++++++++++++++++++++++++++++++++ > 1 file changed, 33 insertions(+) Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
