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 15 static 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 23 static 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 29 static 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 39 static 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 54 void 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 ar->gpe.sts[0] |= ACPI_CPU_HOTPLUG_STATUS; 63 acpi_update_sci(ar, irq); 64 } 65 66 void acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner, 67 AcpiCpuHotplug *gpe_cpu, uint16_t base) 68 { 69 CPUState *cpu; 70 71 CPU_FOREACH(cpu) { 72 acpi_set_cpu_present_bit(gpe_cpu, cpu, &error_abort); 73 } 74 memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops, 75 gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN); 76 memory_region_add_subregion(parent, base, &gpe_cpu->io); 77 } 78