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 "qemu/osdep.h"
  13#include "hw/hw.h"
  14#include "hw/acpi/cpu_hotplug.h"
  15#include "qapi/error.h"
  16#include "qom/cpu.h"
  17
  18static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size)
  19{
  20    AcpiCpuHotplug *cpus = opaque;
  21    uint64_t val = cpus->sts[addr];
  22
  23    return val;
  24}
  25
  26static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data,
  27                             unsigned int size)
  28{
  29    /* TODO: implement VCPU removal on guest signal that CPU can be removed */
  30}
  31
  32static const MemoryRegionOps AcpiCpuHotplug_ops = {
  33    .read = cpu_status_read,
  34    .write = cpu_status_write,
  35    .endianness = DEVICE_LITTLE_ENDIAN,
  36    .valid = {
  37        .min_access_size = 1,
  38        .max_access_size = 1,
  39    },
  40};
  41
  42static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu,
  43                                     Error **errp)
  44{
  45    CPUClass *k = CPU_GET_CLASS(cpu);
  46    int64_t cpu_id;
  47
  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);
  51        return;
  52    }
  53
  54    g->sts[cpu_id / 8] |= (1 << (cpu_id % 8));
  55}
  56
  57void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq,
  58                      AcpiCpuHotplug *g, DeviceState *dev, Error **errp)
  59{
  60    acpi_set_cpu_present_bit(g, CPU(dev), errp);
  61    if (*errp != NULL) {
  62        return;
  63    }
  64
  65    acpi_send_gpe_event(ar, irq, ACPI_CPU_HOTPLUG_STATUS);
  66}
  67
  68void acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
  69                           AcpiCpuHotplug *gpe_cpu, uint16_t base)
  70{
  71    CPUState *cpu;
  72
  73    CPU_FOREACH(cpu) {
  74        acpi_set_cpu_present_bit(gpe_cpu, cpu, &error_abort);
  75    }
  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);
  79}
  80