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hw/loongarch/virt: Enable cpu hotplug feature on virt machine

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On virt machine, enable CPU hotplug feature has_hotpluggable_cpus. For
hot-added CPUs, there is socket-id/core-id/thread-id property set,
arch_id can be caculated from these properties. So that cpu slot can be
searched from its arch_id.

Co-developed-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
This commit is contained in:
Bibo Mao 2025-02-10 17:03:29 +08:00
parent 25cdac981f
commit a97cceb1d7
1 changed files with 42 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

44
hw/loongarch/virt.c
View file

@ -861,10 +861,42 @@ static void virt_cpu_pre_plug(HotplugHandler *hotplug_dev,
CPUArchId *cpu_slot;
Error *err = NULL;
LoongArchCPUTopo topo;
int arch_id;
if (lvms->acpi_ged) {
error_setg(&err, "CPU hotplug not supported");
goto out;
if ((cpu->thread_id < 0) || (cpu->thread_id >= ms->smp.threads)) {
error_setg(&err,
"Invalid thread-id %u specified, must be in range 1:%u",
cpu->thread_id, ms->smp.threads - 1);
goto out;
}
if ((cpu->core_id < 0) || (cpu->core_id >= ms->smp.cores)) {
error_setg(&err,
"Invalid core-id %u specified, must be in range 1:%u",
cpu->core_id, ms->smp.cores - 1);
goto out;
}
if ((cpu->socket_id < 0) || (cpu->socket_id >= ms->smp.sockets)) {
error_setg(&err,
"Invalid socket-id %u specified, must be in range 1:%u",
cpu->socket_id, ms->smp.sockets - 1);
goto out;
}
topo.socket_id = cpu->socket_id;
topo.core_id = cpu->core_id;
topo.thread_id = cpu->thread_id;
arch_id = virt_get_arch_id_from_topo(ms, &topo);
cpu_slot = virt_find_cpu_slot(ms, arch_id);
if (CPU(cpu_slot->cpu)) {
error_setg(&err,
"cpu(id%d=%d:%d:%d) with arch-id %" PRIu64 " exists",
cs->cpu_index, cpu->socket_id, cpu->core_id,
cpu->thread_id, cpu_slot->arch_id);
goto out;
}
} else {
/* For cold-add cpu, find empty cpu slot */
cpu_slot = virt_find_empty_cpu_slot(ms);
@ -967,6 +999,13 @@ static void virt_cpu_plug(HotplugHandler *hotplug_dev,
}
}
if (lvms->acpi_ged) {
hotplug_handler_plug(HOTPLUG_HANDLER(lvms->acpi_ged), dev, &err);
if (err) {
error_propagate(errp, err);
}
}
return;
}
@ -1149,6 +1188,7 @@ static void virt_class_init(ObjectClass *oc, void *data)
mc->numa_mem_supported = true;
mc->auto_enable_numa_with_memhp = true;
mc->auto_enable_numa_with_memdev = true;
mc->has_hotpluggable_cpus = true;
mc->get_hotplug_handler = virt_get_hotplug_handler;
mc->default_nic = "virtio-net-pci";
hc->plug = virt_device_plug_cb;