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81cea5e7 IM |
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 | */ | |
b6a0aa05 | 12 | #include "qemu/osdep.h" |
81cea5e7 IM |
13 | #include "hw/hw.h" |
14 | #include "hw/acpi/cpu_hotplug.h" | |
da34e65c | 15 | #include "qapi/error.h" |
508127e2 | 16 | #include "qom/cpu.h" |
81cea5e7 IM |
17 | |
18 | static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size) | |
19 | { | |
20 | AcpiCpuHotplug *cpus = opaque; | |
21 | uint64_t val = cpus->sts[addr]; | |
22 | ||
23 | return val; | |
24 | } | |
25 | ||
26 | static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data, | |
27 | unsigned int size) | |
28 | { | |
29 | /* TODO: implement VCPU removal on guest signal that CPU can be removed */ | |
30 | } | |
31 | ||
32 | static const MemoryRegionOps AcpiCpuHotplug_ops = { | |
33 | .read = cpu_status_read, | |
34 | .write = cpu_status_write, | |
35 | .endianness = DEVICE_LITTLE_ENDIAN, | |
36 | .valid = { | |
37 | .min_access_size = 1, | |
38 | .max_access_size = 1, | |
39 | }, | |
40 | }; | |
41 | ||
cc43364d GZ |
42 | static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu, |
43 | Error **errp) | |
1be6b511 | 44 | { |
1be6b511 GZ |
45 | CPUClass *k = CPU_GET_CLASS(cpu); |
46 | int64_t cpu_id; | |
47 | ||
48 | cpu_id = k->get_arch_id(cpu); | |
49 | if ((cpu_id / 8) >= ACPI_GPE_PROC_LEN) { | |
50 | error_setg(errp, "acpi: invalid cpu id: %" PRIi64, cpu_id); | |
51 | return; | |
52 | } | |
53 | ||
08bba95b | 54 | g->sts[cpu_id / 8] |= (1 << (cpu_id % 8)); |
cc43364d GZ |
55 | } |
56 | ||
57 | void acpi_cpu_plug_cb(ACPIREGS *ar, qemu_irq irq, | |
58 | AcpiCpuHotplug *g, DeviceState *dev, Error **errp) | |
59 | { | |
60 | acpi_set_cpu_present_bit(g, CPU(dev), errp); | |
61 | if (*errp != NULL) { | |
62 | return; | |
63 | } | |
1be6b511 | 64 | |
ca9b46bc | 65 | acpi_send_gpe_event(ar, irq, ACPI_CPU_HOTPLUG_STATUS); |
1be6b511 GZ |
66 | } |
67 | ||
411b5db8 GZ |
68 | void acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner, |
69 | AcpiCpuHotplug *gpe_cpu, uint16_t base) | |
81cea5e7 IM |
70 | { |
71 | CPUState *cpu; | |
72 | ||
73 | CPU_FOREACH(cpu) { | |
cc43364d | 74 | acpi_set_cpu_present_bit(gpe_cpu, cpu, &error_abort); |
81cea5e7 IM |
75 | } |
76 | memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops, | |
77 | gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN); | |
78 | memory_region_add_subregion(parent, base, &gpe_cpu->io); | |
79 | } |