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 16 static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size) 17 { 18 AcpiCpuHotplug *cpus = opaque; 19 uint64_t val = cpus->sts[addr]; 20 21 return val; 22 } 23 24 static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data, 25 unsigned int size) 26 { 27 /* TODO: implement VCPU removal on guest signal that CPU can be removed */ 28 } 29 30 static const MemoryRegionOps AcpiCpuHotplug_ops = { 31 .read = cpu_status_read, 32 .write = cpu_status_write, 33 .endianness = DEVICE_LITTLE_ENDIAN, 34 .valid = { 35 .min_access_size = 1, 36 .max_access_size = 1, 37 }, 38 }; 39 40 static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu, 41 Error **errp) 42 { 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 g->sts[cpu_id / 8] |= (1 << (cpu_id % 8)); 53 } 54 55 void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq, 56 AcpiCpuHotplug *g, DeviceState *dev, Error **errp) 57 { 58 acpi_set_cpu_present_bit(g, CPU(dev), errp); 59 if (*errp != NULL) { 60 return; 61 } 62 63 acpi_send_gpe_event(ar, irq, ACPI_CPU_HOTPLUG_STATUS); 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