diff options
Diffstat (limited to 'hw/acpi')
| -rw-r--r-- | hw/acpi/cpu.c | 9 | ||||
| -rw-r--r-- | hw/acpi/cpu_hotplug.c | 21 | ||||
| -rw-r--r-- | hw/acpi/ich9.c | 33 | ||||
| -rw-r--r-- | hw/acpi/piix4.c | 32 |
4 files changed, 94 insertions, 1 deletions
diff --git a/hw/acpi/cpu.c b/hw/acpi/cpu.c index 401ac0d..c13b65c 100644 --- a/hw/acpi/cpu.c +++ b/hw/acpi/cpu.c @@ -373,6 +373,15 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts, aml_append(field, aml_named_field(CPU_DATA, 32)); aml_append(cpu_ctrl_dev, field); + if (opts.has_legacy_cphp) { + method = aml_method("_INI", 0, AML_SERIALIZED); + /* switch off legacy CPU hotplug HW and use new one, + * on reboot system is in new mode and writing 0 + * in CPU_SELECTOR selects BSP, which is NOP at + * the time _INI is called */ + aml_append(method, aml_store(zero, aml_name(CPU_SELECTOR))); + aml_append(cpu_ctrl_dev, method); + } } aml_append(sb_scope, cpu_ctrl_dev); diff --git a/hw/acpi/cpu_hotplug.c b/hw/acpi/cpu_hotplug.c index fe75bd9..e19d902 100644 --- a/hw/acpi/cpu_hotplug.c +++ b/hw/acpi/cpu_hotplug.c @@ -34,7 +34,15 @@ static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size) static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data, unsigned int size) { - /* TODO: implement VCPU removal on guest signal that CPU can be removed */ + /* firmware never used to write in CPU present bitmap so use + this fact as means to switch QEMU into modern CPU hotplug + mode by writing 0 at the beginning of legacy CPU bitmap + */ + if (addr == 0 && data == 0) { + AcpiCpuHotplug *cpus = opaque; + object_property_set_bool(cpus->device, false, "cpu-hotplug-legacy", + &error_abort); + } } static const MemoryRegionOps AcpiCpuHotplug_ops = { @@ -83,6 +91,17 @@ void legacy_acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner, memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops, gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN); memory_region_add_subregion(parent, base, &gpe_cpu->io); + gpe_cpu->device = owner; +} + +void acpi_switch_to_modern_cphp(AcpiCpuHotplug *gpe_cpu, + CPUHotplugState *cpuhp_state, + uint16_t io_port) +{ + MemoryRegion *parent = pci_address_space_io(PCI_DEVICE(gpe_cpu->device)); + + memory_region_del_subregion(parent, &gpe_cpu->io); + cpu_hotplug_hw_init(parent, gpe_cpu->device, cpuhp_state, io_port); } void build_legacy_cpu_hotplug_aml(Aml *ctx, MachineState *machine, diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c index d12cc62..e5a3c18 100644 --- a/hw/acpi/ich9.c +++ b/hw/acpi/ich9.c @@ -189,6 +189,33 @@ static const VMStateDescription vmstate_tco_io_state = { } }; +static bool vmstate_test_use_cpuhp(void *opaque) +{ + ICH9LPCPMRegs *s = opaque; + return !s->cpu_hotplug_legacy; +} + +static int vmstate_cpuhp_pre_load(void *opaque) +{ + ICH9LPCPMRegs *s = opaque; + Object *obj = OBJECT(s->gpe_cpu.device); + object_property_set_bool(obj, false, "cpu-hotplug-legacy", &error_abort); + return 0; +} + +static const VMStateDescription vmstate_cpuhp_state = { + .name = "ich9_pm/cpuhp", + .version_id = 1, + .minimum_version_id = 1, + .minimum_version_id_old = 1, + .needed = vmstate_test_use_cpuhp, + .pre_load = vmstate_cpuhp_pre_load, + .fields = (VMStateField[]) { + VMSTATE_CPU_HOTPLUG(cpuhp_state, ICH9LPCPMRegs), + VMSTATE_END_OF_LIST() + } +}; + const VMStateDescription vmstate_ich9_pm = { .name = "ich9_pm", .version_id = 1, @@ -209,6 +236,7 @@ const VMStateDescription vmstate_ich9_pm = { .subsections = (const VMStateDescription*[]) { &vmstate_memhp_state, &vmstate_tco_io_state, + &vmstate_cpuhp_state, NULL } }; @@ -318,6 +346,11 @@ static void ich9_pm_set_cpu_hotplug_legacy(Object *obj, bool value, { ICH9LPCState *s = ICH9_LPC_DEVICE(obj); + assert(!value); + if (s->pm.cpu_hotplug_legacy && value == false) { + acpi_switch_to_modern_cphp(&s->pm.gpe_cpu, &s->pm.cpuhp_state, + ICH9_CPU_HOTPLUG_IO_BASE); + } s->pm.cpu_hotplug_legacy = value; } diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c index 858244a..2adc246 100644 --- a/hw/acpi/piix4.c +++ b/hw/acpi/piix4.c @@ -276,6 +276,32 @@ static const VMStateDescription vmstate_memhp_state = { } }; +static bool vmstate_test_use_cpuhp(void *opaque) +{ + PIIX4PMState *s = opaque; + return !s->cpu_hotplug_legacy; +} + +static int vmstate_cpuhp_pre_load(void *opaque) +{ + Object *obj = OBJECT(opaque); + object_property_set_bool(obj, false, "cpu-hotplug-legacy", &error_abort); + return 0; +} + +static const VMStateDescription vmstate_cpuhp_state = { + .name = "piix4_pm/cpuhp", + .version_id = 1, + .minimum_version_id = 1, + .minimum_version_id_old = 1, + .needed = vmstate_test_use_cpuhp, + .pre_load = vmstate_cpuhp_pre_load, + .fields = (VMStateField[]) { + VMSTATE_CPU_HOTPLUG(cpuhp_state, PIIX4PMState), + VMSTATE_END_OF_LIST() + } +}; + /* qemu-kvm 1.2 uses version 3 but advertised as 2 * To support incoming qemu-kvm 1.2 migration, change version_id * and minimum_version_id to 2 below (which breaks migration from @@ -310,6 +336,7 @@ static const VMStateDescription vmstate_acpi = { }, .subsections = (const VMStateDescription*[]) { &vmstate_memhp_state, + &vmstate_cpuhp_state, NULL } }; @@ -585,6 +612,11 @@ static void piix4_set_cpu_hotplug_legacy(Object *obj, bool value, Error **errp) { PIIX4PMState *s = PIIX4_PM(obj); + assert(!value); + if (s->cpu_hotplug_legacy && value == false) { + acpi_switch_to_modern_cphp(&s->gpe_cpu, &s->cpuhp_state, + PIIX4_CPU_HOTPLUG_IO_BASE); + } s->cpu_hotplug_legacy = value; } |