2 * QEMU ACPI hotplug utilities
4 * Copyright (C) 2013 Red Hat Inc
7 * Igor Mammedov <imammedo@redhat.com>
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
12 #include "qemu/osdep.h"
14 #include "hw/acpi/cpu_hotplug.h"
15 #include "qapi/error.h"
18 static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size)
20 AcpiCpuHotplug *cpus = opaque;
21 uint64_t val = cpus->sts[addr];
26 static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data,
29 /* TODO: implement VCPU removal on guest signal that CPU can be removed */
32 static const MemoryRegionOps AcpiCpuHotplug_ops = {
33 .read = cpu_status_read,
34 .write = cpu_status_write,
35 .endianness = DEVICE_LITTLE_ENDIAN,
42 static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu,
45 CPUClass *k = CPU_GET_CLASS(cpu);
48 cpu_id = k->get_arch_id(cpu);
49 if ((cpu_id / 8) >= ACPI_GPE_PROC_LEN) {
50 error_setg(errp, "acpi: invalid cpu id: %" PRIi64, cpu_id);
54 g->sts[cpu_id / 8] |= (1 << (cpu_id % 8));
57 void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq,
58 AcpiCpuHotplug *g, DeviceState *dev, Error **errp)
60 acpi_set_cpu_present_bit(g, CPU(dev), errp);
65 acpi_send_gpe_event(ar, irq, ACPI_CPU_HOTPLUG_STATUS);
68 void acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
69 AcpiCpuHotplug *gpe_cpu, uint16_t base)
74 acpi_set_cpu_present_bit(gpe_cpu, cpu, &error_abort);
76 memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops,
77 gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN);
78 memory_region_add_subregion(parent, base, &gpe_cpu->io);