[PATCH v2 0/6] Support calling functions on dedicated physical cpu

From: Juergen Gross
Date: Mon Mar 21 2016 - 08:25:00 EST

Some hardware (e.g. Dell Studio laptops) require special functions to
be called on physical cpu 0 in order to avoid occasional hangs. When
running as dom0 under Xen this could be achieved only via special boot
parameters (vcpu pinning) limiting the hypervisor in it's scheduling

This patch series is adding a generic function to be able to temporarily
pin a (virtual) cpu to a dedicated physical cpu for executing above
mentioned functions on that specific cpu. The drivers (dcdbas and i8k)
requiring this functionality are modified accordingly.

Changes in V2:
- instead of manipulating the allowed set of cpus use cpu specific
workqueue as requested by Peter Zijlstra
- add include/linux/hypervisor.h to hide architecture specific stuff
from generic kernel cod

Juergen Gross (6):
xen: sync xen header
smp: add function to execute a function synchronously on a physical
dcdbas: make use of smp_call_sync_on_phys_cpu()
hwmon: use smp_call_sync_on_phys_cpu() for dell-smm i8k
virt, sched: add cpu pinning to smp_call_sync_on_phys_cpu()
xen: add xen_pin_vcpu() to support calling functions on a dedicated

arch/x86/include/asm/hypervisor.h | 9 ++++
arch/x86/xen/enlighten.c | 40 +++++++++++++++
drivers/firmware/dcdbas.c | 46 ++++++++----------
drivers/hwmon/dell-smm-hwmon.c | 27 +++++-----
include/linux/hypervisor.h | 17 +++++++
include/linux/smp.h | 2 +
include/xen/interface/sched.h | 100 +++++++++++++++++++++++++++++++-------
kernel/smp.c | 50 +++++++++++++++++++
kernel/up.c | 18 +++++++
10 files changed, 251 insertions(+), 59 deletions(-)
create mode 100644 include/linux/hypervisor.h