Enabling this option will make the kernel run more efficiently on logically-partitioned pSeries systems which use shared processors, that is, which share physical processors between two or more partitions. Say Y if you are unsure.
SPLPAR machines can log hypervisor preempt & dispatch events to a kernel buffer. Saying Y here will enable logging these events, which are accessible through a debugfs file. Say N if you are unsure.
Provides interface to platform energy management capabilities on supported PSERIES platforms. Provides: /sys/devices/system/cpu/pseries_(de)activation_hint_list and /sys/devices/system/cpu/cpuN/pseries_(de)activation_hint
Select this option, if you want to enable support for IO Event interrupts. IO event interrupt is a mechanism provided by RTAS to return information about hardware error and non-error events which may need OS attention. RTAS returns events for multiple event types and scopes. Device drivers can register their handlers to receive events. This option will only enable the IO event platform code. You will still need to enable or compile the actual drivers that use this infrastructure to handle IO event interrupts. Say Y if you are unsure.
Provide system capacity information via human readable <key word>=<value> pairs through a /proc/ppc64/lparcfg interface.
Say Y here if you want the pseries core to produce a bunch of debug messages to the system log. Select this if you are having a problem with the pseries core and want to see more of what is going on. This does not enable debugging in lpar.c, which must be manually done due to its verbosity.
Select this option to enable shared memory partition support. With this option a system running in an LPAR can be given more memory than physically available and will allow firmware to balance memory across many LPARs.
Select this option, if you want to enable the kernel interface to reduce the memory size of the system. This is accomplished by allocating pages of memory and put them "on hold". This only makes sense for a system running in an LPAR where the unused pages will be reused for other LPARs. The interface allows firmware to balance memory across many LPARs.
Enable access to hypervisor supplied counters in perf. Currently, this enables code that uses the hcall GetPerfCounterInfo and 24x7 interfaces to retrieve counters. GPCI exists on Power 6 and later systems. 24x7 is available on Power 8 and later systems. If unsure, select Y.
Bus device driver for GX bus based adapters.
Enable access to hypervisor provided storage class memory.
There are certain POWER platforms which support secure guests using the Protected Execution Facility, with the help of an Ultravisor executing below the hypervisor layer. This enables support for those guests. If unsure, say "N".