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 18 static 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 26 static 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 32 static 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 42 static 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 57 void 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 68 void 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