[PATCH v9 0/6] Implement CPU hotplug on Arm

This series implements support for CPU hotplug/unplug on Arm. To achieve
this, several things need to be done:

1. XEN_SYSCTL_CPU_HOTPLUG_* calls implemented on Arm64.
2. Enabled building of xen-hptool.
3. Migration of irqs from dying CPUs implemented.

Tested on QEMU and R-Car Gen5 HW.

v8->v9:
* rebase
* see individual patches

v7->v8:
* see individual patches

v6->v7:
* new patch "Kconfig: Make cpu hotplug configurable

v5->v6:
* see individual patches

v4->v5:
* drop merged patches
* combine "smp: Move cpu_up/down helpers to common code" with 
  "arm/sysctl: Implement cpu hotplug ops"
* see individual patches

v3->v4:
* add irq migration patches
* see individual patches

v2->v3:
* add docs

v1->v2:
* see individual patches

Mykyta Poturai (6):
  arm/irq: Keep track of irq affinities
  arm/irq: Migrate IRQs during CPU up/down operations
  Kconfig: Make cpu hotplug configurable
  arm/sysctl: Implement cpu hotplug ops
  tools: Allow building xen-hptool without CONFIG_MIGRATE
  docs: Document CPU hotplug

 docs/misc/cpu-hotplug.txt         |  98 ++++++++++
 tools/misc/Makefile               |   9 +-
 tools/misc/xen-hptool-x86.c       | 278 ++++++++++++++++++++++++++++
 tools/misc/xen-hptool.c           | 293 ++----------------------------
 tools/misc/xen-hptool.h           |  15 ++
 xen/arch/arm/gic-vgic.c           |   2 +
 xen/arch/arm/include/asm/irq.h    |   6 +
 xen/arch/arm/irq.c                |  69 ++++++-
 xen/arch/arm/smp.c                |   9 +
 xen/arch/arm/smpboot.c            |   7 +
 xen/arch/arm/vgic.c               |  14 +-
 xen/arch/arm/vgic/vgic-mmio-v2.c  |  11 +-
 xen/arch/arm/vgic/vgic.c          |  21 ++-
 xen/arch/ppc/stubs.c              |   5 +
 xen/arch/riscv/stubs.c            |   5 +
 xen/arch/x86/include/asm/smp.h    |   3 -
 xen/arch/x86/platform_hypercall.c |  12 ++
 xen/arch/x86/smp.c                |  35 +---
 xen/arch/x86/sysctl.c             |  23 ++-
 xen/common/Kconfig                |   8 +
 xen/common/smp.c                  |  35 ++++
 xen/common/sysctl.c               |  34 ++++
 xen/include/xen/smp.h             |   4 +
 xen/xsm/flask/hooks.c             |   2 +-
 24 files changed, 658 insertions(+), 340 deletions(-)
 create mode 100644 docs/misc/cpu-hotplug.txt
 create mode 100644 tools/misc/xen-hptool-x86.c
 create mode 100644 tools/misc/xen-hptool.h

-- 
2.55.0