LXR qemu/hw/acpi/cpu

   1/*
   2 * QEMU ACPI hotplug utilities
   3 *
   4 * Copyright (C) 2013 Red Hat Inc
   5 *
   6 * Authors:
   7 *   Igor Mammedov <imammedo@redhat.com>
   8 *
   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.
  11 */
  12#include "hw/hw.h"
  13#include "hw/acpi/cpu_hotplug.h"
  14
  15static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size)
  16{
  17    AcpiCpuHotplug *cpus = opaque;
  18    uint64_t val = cpus->sts[addr];
  19
  20    return val;
  21}
  22
  23static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data,
  24                             unsigned int size)
  25{
  26    /* TODO: implement VCPU removal on guest signal that CPU can be removed */
  27}
  28
  29static const MemoryRegionOps AcpiCpuHotplug_ops = {
  30    .read = cpu_status_read,
  31    .write = cpu_status_write,
  32    .endianness = DEVICE_LITTLE_ENDIAN,
  33    .valid = {
  34        .min_access_size = 1,
  35        .max_access_size = 1,
  36    },
  37};
  38
  39static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu,
  40                                     Error **errp)
  41{
  42    CPUClass *k = CPU_GET_CLASS(cpu);
  43    int64_t cpu_id;
  44
  45    cpu_id = k->get_arch_id(cpu);
  46    if ((cpu_id / 8) >= ACPI_GPE_PROC_LEN) {
  47        error_setg(errp, "acpi: invalid cpu id: %" PRIi64, cpu_id);
  48        return;
  49    }
  50
  51    g->sts[cpu_id / 8] |= (1 << (cpu_id % 8));
  52}
  53
  54void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq,
  55                      AcpiCpuHotplug *g, DeviceState *dev, Error **errp)
  56{
  57    acpi_set_cpu_present_bit(g, CPU(dev), errp);
  58    if (*errp != NULL) {
  59        return;
  60    }
  61
  62    acpi_send_gpe_event(ar, irq, ACPI_CPU_HOTPLUG_STATUS);
  63}
  64
  65void acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
  66                           AcpiCpuHotplug *gpe_cpu, uint16_t base)
  67{
  68    CPUState *cpu;
  69
  70    CPU_FOREACH(cpu) {
  71        acpi_set_cpu_present_bit(gpe_cpu, cpu, &error_abort);
  72    }
  73    memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops,
  74                          gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN);
  75    memory_region_add_subregion(parent, base, &gpe_cpu->io);
  76}
  77