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 AcpiCpuHotplug_add(ACPIGPE *gpe, AcpiCpuHotplug *g, CPUState *cpu) 40 { 41 CPUClass *k = CPU_GET_CLASS(cpu); 42 int64_t cpu_id; 43 44 *gpe->sts = *gpe->sts | ACPI_CPU_HOTPLUG_STATUS; 45 cpu_id = k->get_arch_id(CPU(cpu)); 46 g_assert((cpu_id / 8) < ACPI_GPE_PROC_LEN); 47 g->sts[cpu_id / 8] |= (1 << (cpu_id % 8)); 48 } 49 50 void AcpiCpuHotplug_init(MemoryRegion *parent, Object *owner, 51 AcpiCpuHotplug *gpe_cpu, uint16_t base) 52 { 53 CPUState *cpu; 54 55 CPU_FOREACH(cpu) { 56 CPUClass *cc = CPU_GET_CLASS(cpu); 57 int64_t id = cc->get_arch_id(cpu); 58 59 g_assert((id / 8) < ACPI_GPE_PROC_LEN); 60 gpe_cpu->sts[id / 8] |= (1 << (id % 8)); 61 } 62 memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops, 63 gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN); 64 memory_region_add_subregion(parent, base, &gpe_cpu->io); 65 } 66