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[PATCH v7 0/6] Implement CPU hotplug on Arm
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- Date: Mon, 30 Mar 2026 11:59:49 +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.pau@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>, Juergen Gross <jgross@xxxxxxxx>
- Delivery-date: Mon, 30 Mar 2026 11:59:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHcwDy1/SbobzFSYEOfZMP9koGeVg==
- Thread-topic: [PATCH v7 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.
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
SUPPORT.md | 1 +
docs/misc/cpu-hotplug.txt | 97 +++++++++++++++++++++++++++++++
tools/libs/guest/Makefile.common | 2 +-
tools/misc/Makefile | 2 +-
xen/arch/arm/gic-vgic.c | 2 +
xen/arch/arm/include/asm/irq.h | 6 ++
xen/arch/arm/irq.c | 68 +++++++++++++++++++++-
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 | 4 ++
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 | 33 +----------
xen/arch/x86/sysctl.c | 24 +++++---
xen/common/Kconfig | 8 +++
xen/common/smp.c | 35 +++++++++++
xen/common/sysctl.c | 42 +++++++++++++
xen/include/xen/smp.h | 4 ++
xen/xsm/flask/hooks.c | 2 -
23 files changed, 348 insertions(+), 64 deletions(-)
create mode 100644 docs/misc/cpu-hotplug.txt
--
2.51.2
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