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 void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq, 40 AcpiCpuHotplug *g, DeviceState *dev, Error **errp) 41 { 42 CPUState *cpu = CPU(dev); 43 CPUClass *k = CPU_GET_CLASS(cpu); 44 int64_t cpu_id; 45 46 cpu_id = k->get_arch_id(cpu); 47 if ((cpu_id / 8) >= ACPI_GPE_PROC_LEN) { 48 error_setg(errp, "acpi: invalid cpu id: %" PRIi64, cpu_id); 49 return; 50 } 51 52 AcpiCpuHotplug_add(&ar->gpe, g, cpu); 53 54 acpi_update_sci(ar, irq); 55 } 56 57 void AcpiCpuHotplug_add(ACPIGPE *gpe, AcpiCpuHotplug *g, CPUState *cpu) 58 { 59 CPUClass *k = CPU_GET_CLASS(cpu); 60 int64_t cpu_id; 61 62 *gpe->sts = *gpe->sts | ACPI_CPU_HOTPLUG_STATUS; 63 cpu_id = k->get_arch_id(CPU(cpu)); 64 g_assert((cpu_id / 8) < ACPI_GPE_PROC_LEN); 65 g->sts[cpu_id / 8] |= (1 << (cpu_id % 8)); 66 } 67 68 void AcpiCpuHotplug_init(MemoryRegion *parent, Object *owner, 69 AcpiCpuHotplug *gpe_cpu, uint16_t base) 70 { 71 CPUState *cpu; 72 73 CPU_FOREACH(cpu) { 74 CPUClass *cc = CPU_GET_CLASS(cpu); 75 int64_t id = cc->get_arch_id(cpu); 76 77 g_assert((id / 8) < ACPI_GPE_PROC_LEN); 78 gpe_cpu->sts[id / 8] |= (1 << (id % 8)); 79 } 80 memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops, 81 gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN); 82 memory_region_add_subregion(parent, base, &gpe_cpu->io); 83 } 84