[PATCH v5 0/5] Implement CPU hotplug on Arm

[Mykyta Poturai <Mykyta_Poturai@epam.com>]

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.

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 (5):
  arm/irq: Keep track of irq affinities
  arm/irq: Migrate IRQs during CPU up/down operations
  arm/sysctl: Implement cpu hotplug ops
  tools: Allow building xen-hptool without CONFIG_MIGRATE
  docs: Document CPU hotplug

 SUPPORT.md                       |  1 +
 docs/misc/cpu-hotplug.txt        | 50 +++++++++++++++++++++++++
 tools/libs/guest/Makefile.common |  2 +-
 tools/misc/Makefile              |  2 +-
 xen/arch/arm/Kconfig             |  1 +
 xen/arch/arm/gic-vgic.c          |  2 +
 xen/arch/arm/include/asm/irq.h   |  2 +
 xen/arch/arm/irq.c               | 63 +++++++++++++++++++++++++++++++-
 xen/arch/arm/smp.c               |  9 +++++
 xen/arch/arm/smpboot.c           |  6 +++
 xen/arch/arm/vgic.c              | 14 ++++++-
 xen/arch/ppc/stubs.c             |  4 ++
 xen/arch/riscv/stubs.c           |  5 +++
 xen/arch/x86/Kconfig             |  1 +
 xen/arch/x86/include/asm/smp.h   |  3 --
 xen/arch/x86/smp.c               | 33 ++---------------
 xen/arch/x86/sysctl.c            | 12 ++----
 xen/common/Kconfig               |  3 ++
 xen/common/smp.c                 | 34 +++++++++++++++++
 xen/common/sysctl.c              | 45 +++++++++++++++++++++++
 xen/include/xen/smp.h            |  4 ++
 21 files changed, 248 insertions(+), 48 deletions(-)
 create mode 100644 docs/misc/cpu-hotplug.txt

-- 
2.51.2