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 "qom/cpu.h" 16 17 static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size) 18 { 19 AcpiCpuHotplug *cpus = opaque; 20 uint64_t val = cpus->sts[addr]; 21 22 return val; 23 } 24 25 static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data, 26 unsigned int size) 27 { 28 /* TODO: implement VCPU removal on guest signal that CPU can be removed */ 29 } 30 31 static const MemoryRegionOps AcpiCpuHotplug_ops = { 32 .read = cpu_status_read, 33 .write = cpu_status_write, 34 .endianness = DEVICE_LITTLE_ENDIAN, 35 .valid = { 36 .min_access_size = 1, 37 .max_access_size = 1, 38 }, 39 }; 40 41 static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu, 42 Error **errp) 43 { 44 CPUClass *k = CPU_GET_CLASS(cpu); 45 int64_t cpu_id; 46 47 cpu_id = k->get_arch_id(cpu); 48 if ((cpu_id / 8) >= ACPI_GPE_PROC_LEN) { 49 error_setg(errp, "acpi: invalid cpu id: %" PRIi64, cpu_id); 50 return; 51 } 52 53 g->sts[cpu_id / 8] |= (1 << (cpu_id % 8)); 54 } 55 56 void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq, 57 AcpiCpuHotplug *g, DeviceState *dev, Error **errp) 58 { 59 acpi_set_cpu_present_bit(g, CPU(dev), errp); 60 if (*errp != NULL) { 61 return; 62 } 63 64 acpi_send_gpe_event(ar, irq, ACPI_CPU_HOTPLUG_STATUS); 65 } 66 67 void acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner, 68 AcpiCpuHotplug *gpe_cpu, uint16_t base) 69 { 70 CPUState *cpu; 71 72 CPU_FOREACH(cpu) { 73 acpi_set_cpu_present_bit(gpe_cpu, cpu, &error_abort); 74 } 75 memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops, 76 gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN); 77 memory_region_add_subregion(parent, base, &gpe_cpu->io); 78 } 79