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. 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 (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/gic-vgic.c | 2 + xen/arch/arm/include/asm/irq.h | 4 ++ xen/arch/arm/irq.c | 69 ++++++++++++++++++++++++++++++- xen/arch/arm/smp.c | 9 ++++ xen/arch/arm/smpboot.c | 8 ++++ xen/arch/arm/vgic.c | 14 ++++++- xen/arch/arm/vgic/vgic-mmio-v2.c | 11 +++-- xen/arch/arm/vgic/vgic.c | 15 +++---- 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 | 21 ++++++---- xen/common/Kconfig | 6 +++ xen/common/smp.c | 35 ++++++++++++++++ xen/common/sysctl.c | 46 +++++++++++++++++++++ xen/include/xen/smp.h | 4 ++ xen/xsm/flask/hooks.c | 2 +- 23 files changed, 296 insertions(+), 62 deletions(-) create mode 100644 docs/misc/cpu-hotplug.txt -- 2.51.2
