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[PATCH v9 0/6] Implement CPU hotplug on Arm
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- Date: Tue, 18 Aug 2026 08:48:28 +0000
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- Cc: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Timothy Pearson <tpearson@xxxxxxxxxxxxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 18 Aug 2026 08:48:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHdLu5XTX2wVWAf/0WnWqy3wZ0dQA==
- Thread-topic: [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
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