xen/acpi: Provide a ACPI driver that sends "processor" data to the hypervisor.
The ACPI processor processes the _Pxx and the _Cx state information
which are populated in the 'processor' per-cpu structure. We read
the contents of that structure and pipe it up the Xen hypervisor.
We assume that the ACPI processor is smart and did all the filtering
work so that the contents is correct. After we are done parsing
the information, we unload ourselves and let the hypervisor deal
with cpufreq, cpuidle states and such.
Note: This only works right now under Intel CPUs, b/c the Xen hypervisor
does not properly process the AMD MSR_PSTATE_CUR_LIMIT and the hypervisor
should pass in the MWAIT CPU attribute:
http://old-list-archives.xen.org/archives/html/xen-devel/2011-08/msg00511.html
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
3 files changed
