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[PATCH v5 0/5] Implement CPU hotplug on Arm
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- Date: Tue, 13 Jan 2026 08:45:33 +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>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@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: Tue, 13 Jan 2026 08:45:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHchGj6Bf8iLxj9KkKeGyrpjQwglA==
- Thread-topic: [PATCH v5 0/5] 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.
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
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