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