79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/*
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* QEMU ACPI hotplug utilities
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*
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* Copyright (C) 2013 Red Hat Inc
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*
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* Authors:
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* Igor Mammedov <imammedo@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/hw.h"
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#include "hw/acpi/cpu_hotplug.h"
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#include "qom/cpu.h"
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static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size)
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{
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AcpiCpuHotplug *cpus = opaque;
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uint64_t val = cpus->sts[addr];
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return val;
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}
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static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data,
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unsigned int size)
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{
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/* TODO: implement VCPU removal on guest signal that CPU can be removed */
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}
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static const MemoryRegionOps AcpiCpuHotplug_ops = {
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.read = cpu_status_read,
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.write = cpu_status_write,
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.endianness = DEVICE_LITTLE_ENDIAN,
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.valid = {
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.min_access_size = 1,
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.max_access_size = 1,
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},
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};
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static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu,
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Error **errp)
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{
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CPUClass *k = CPU_GET_CLASS(cpu);
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int64_t cpu_id;
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cpu_id = k->get_arch_id(cpu);
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if ((cpu_id / 8) >= ACPI_GPE_PROC_LEN) {
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error_setg(errp, "acpi: invalid cpu id: %" PRIi64, cpu_id);
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return;
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}
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g->sts[cpu_id / 8] |= (1 << (cpu_id % 8));
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}
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void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq,
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AcpiCpuHotplug *g, DeviceState *dev, Error **errp)
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{
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acpi_set_cpu_present_bit(g, CPU(dev), errp);
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if (*errp != NULL) {
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return;
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}
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acpi_send_gpe_event(ar, irq, ACPI_CPU_HOTPLUG_STATUS);
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}
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void acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
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AcpiCpuHotplug *gpe_cpu, uint16_t base)
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{
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CPUState *cpu;
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CPU_FOREACH(cpu) {
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acpi_set_cpu_present_bit(gpe_cpu, cpu, &error_abort);
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}
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memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops,
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gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN);
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memory_region_add_subregion(parent, base, &gpe_cpu->io);
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}
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