I was wondering if you could advise me ontwo questions: - How to "get" ACPI PM information for processors that are down (either b/c of maxcpus=X or they are hot-plugged). The per_cpu(processor) is a great location to get all of this - but sadly it is not filled with information for dead CPUs. Is there another way to get this data? - Where should such a driver (see the patch please) live? I was thinking drivers/acpi/ but since the "processor" is an exported symbol it could live in drivers/xen as well? What is your feeling about it? Short description of the patch: It simple parses the "per_cpu(processor)" data and pipes it up the hypervisor and then unloads itself. It is a much shorter version of https://lkml.org/lkml/2011/11/30/245, but it does have the caveat that it does not work with 'maxcpus' or with hot-plugged CPUs or with limiting the amount of CPUs a guest can see. P.S. Also the name of it stinks. 'Sink' or 'plumber' initially came to my mind. Any thoughts of a better name? Thanks! drivers/xen/Kconfig | 5 + drivers/xen/Makefile | 2 +- drivers/xen/acpi_xen_sink.c | 265 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 271 insertions(+), 1 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html