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hw/acpi: Update ACPI `_STA` method with QOM vCPU ACPI Hotplug states 

Reflect the QOM vCPUs ACPI CPU hotplug states in the `_STA.Present` and
and `_STA.Enabled` bits when the guest kernel evaluates the ACPI
`_STA` method during initialization, as well as when vCPUs are
hot-plugged or hot-unplugged. If the CPU is present then the its
`enabled` status can be fetched using architecture-specific code [1].

Reference:
[1] Example implementation of architecture-specific hook to fetch CPU
    `enabled status
    Link: c0b416b11e

Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Message-Id: <20241103102419.202225-4-salil.mehta@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Salil Mehta 2024-11-03 10:24:17 +00:00 committed by Michael S. Tsirkin
parent e98411c2cb
commit bf1ecc8dad
2 changed files with 35 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
hw/acpi/cpu.c
View File

@ -50,6 +50,18 @@ void acpi_cpu_ospm_status(CPUHotplugState *cpu_st, ACPIOSTInfoList ***list)
}
}
static bool check_cpu_enabled_status(DeviceState *dev)
{
CPUClass *k = dev ? CPU_GET_CLASS(dev) : NULL;
CPUState *cpu = CPU(dev);
if (cpu && (!k->cpu_enabled_status || k->cpu_enabled_status(cpu))) {
return true;
}
return false;
}
static uint64_t cpu_hotplug_rd(void *opaque, hwaddr addr, unsigned size)
{
uint64_t val = 0;
@ -63,10 +75,11 @@ static uint64_t cpu_hotplug_rd(void *opaque, hwaddr addr, unsigned size)
cdev = &cpu_st->devs[cpu_st->selector];
switch (addr) {
case ACPI_CPU_FLAGS_OFFSET_RW: /* pack and return is_* fields */
val |= cdev->cpu ? 1 : 0;
val |= check_cpu_enabled_status(DEVICE(cdev->cpu)) ? 1 : 0;
val |= cdev->is_inserting ? 2 : 0;
val |= cdev->is_removing ? 4 : 0;
val |= cdev->fw_remove ? 16 : 0;
val |= cdev->cpu ? 32 : 0;
trace_cpuhp_acpi_read_flags(cpu_st->selector, val);
break;
case ACPI_CPU_CMD_DATA_OFFSET_RW:
@ -349,6 +362,7 @@ const VMStateDescription vmstate_cpu_hotplug = {
#define CPU_REMOVE_EVENT "CRMV"
#define CPU_EJECT_EVENT "CEJ0"
#define CPU_FW_EJECT_EVENT "CEJF"
#define CPU_PRESENT "CPRS"
void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
build_madt_cpu_fn build_madt_cpu, hwaddr base_addr,
@ -409,7 +423,9 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
aml_append(field, aml_named_field(CPU_EJECT_EVENT, 1));
/* tell firmware to do device eject, write only */
aml_append(field, aml_named_field(CPU_FW_EJECT_EVENT, 1));
aml_append(field, aml_reserved_field(3));
/* 1 if present, read only */
aml_append(field, aml_named_field(CPU_PRESENT, 1));
aml_append(field, aml_reserved_field(2));
aml_append(field, aml_named_field(CPU_COMMAND, 8));
aml_append(cpu_ctrl_dev, field);
@ -439,6 +455,7 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
Aml *ctrl_lock = aml_name("%s.%s", cphp_res_path, CPU_LOCK);
Aml *cpu_selector = aml_name("%s.%s", cphp_res_path, CPU_SELECTOR);
Aml *is_enabled = aml_name("%s.%s", cphp_res_path, CPU_ENABLED);
Aml *is_present = aml_name("%s.%s", cphp_res_path, CPU_PRESENT);
Aml *cpu_cmd = aml_name("%s.%s", cphp_res_path, CPU_COMMAND);
Aml *cpu_data = aml_name("%s.%s", cphp_res_path, CPU_DATA);
Aml *ins_evt = aml_name("%s.%s", cphp_res_path, CPU_INSERT_EVENT);
@ -467,13 +484,26 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
{
Aml *idx = aml_arg(0);
Aml *sta = aml_local(0);
Aml *ifctx2;
Aml *else_ctx;
aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
aml_append(method, aml_store(idx, cpu_selector));
aml_append(method, aml_store(zero, sta));
ifctx = aml_if(aml_equal(is_enabled, one));
ifctx = aml_if(aml_equal(is_present, one));
{
aml_append(ifctx, aml_store(aml_int(0xF), sta));
ifctx2 = aml_if(aml_equal(is_enabled, one));
{
/* cpu is present and enabled */
aml_append(ifctx2, aml_store(aml_int(0xF), sta));
}
aml_append(ifctx, ifctx2);
else_ctx = aml_else();
{
/* cpu is present but disabled */
aml_append(else_ctx, aml_store(aml_int(0xD), sta));
}
aml_append(ifctx, else_ctx);
}
aml_append(method, ifctx);
aml_append(method, aml_release(ctrl_lock));

1
include/hw/core/cpu.h
View File

@ -159,6 +159,7 @@ struct CPUClass {
void (*query_cpu_fast)(CPUState *cpu, CpuInfoFast *value);
int64_t (*get_arch_id)(CPUState *cpu);
bool (*cpu_persistent_status)(CPUState *cpu);
bool (*cpu_enabled_status)(CPUState *cpu);
void (*set_pc)(CPUState *cpu, vaddr value);
vaddr (*get_pc)(CPUState *cpu);
int (*gdb_read_register)(CPUState *cpu, GByteArray *buf, int reg);