Via implementing ACPI standard methods _EJ0 in ACPI table, after Guest OS remove one vCPU online, the fireware will store removed bitmap to QEMU, then QEMU could know to notify the assigned vCPU of exiting. meanwhile, intruduce the QOM command 'device_del' to remove vCPU from QEMU itself.
This job is based on Chen Fan's previous "cpu-del" patchset: https://lists.nongnu.org/archive/html/qemu-devel/2013-12/msg04266.html And it depends on the previous "device_add foo-x86_64-cpu" patchset: https://lists.nongnu.org/archive/html/qemu-devel/2014-06/msg06690.html Chen Fan (4): x86: add x86_cpu_unrealizefn() for cpu apic remove qom cpu: rename variable 'cpu_added_notifier' to 'cpu_hotplug_notifier' i386: implement pc interface cpu_common_unrealizefn() in qom/cpu.c cpu hotplug: implement function cpu_status_write() for vcpu ejection Gu Zheng (3): i386: add cpu device_del support qom cpu: add UNPLUG cpu notify support cpus: reclaim allocated vCPU objects cpus.c | 44 ++++++++++++++++++++++++ hw/acpi/cpu_hotplug.c | 55 ++++++++++++++++++++++++++++--- hw/acpi/ich9.c | 13 ++++--- hw/acpi/piix4.c | 21 +++++++----- hw/i386/acpi-dsdt-cpu-hotplug.dsl | 6 +++- hw/i386/kvm/apic.c | 8 ++++ hw/i386/pc.c | 2 +- hw/intc/apic.c | 10 +++++ hw/intc/apic_common.c | 23 ++++++++++++- include/hw/acpi/cpu_hotplug.h | 14 +++++++- include/hw/acpi/ich9.h | 2 +- include/hw/cpu/icc_bus.h | 1 + include/hw/i386/apic_internal.h | 1 + include/qom/cpu.h | 9 +++++ include/sysemu/kvm.h | 1 + include/sysemu/sysemu.h | 2 +- kvm-all.c | 57 +++++++++++++++++++++++++++++++- qom/cpu.c | 27 ++++++++++++--- target-i386/cpu-qom.h | 1 + target-i386/cpu.c | 66 +++++++++++++++++++++++++++++++++++++ 20 files changed, 332 insertions(+), 31 deletions(-) -- 1.7.7
