On 2020-12-04 9:09 a.m., Igor Mammedov wrote:
if firmware and QEMU negotiated CPU hotunplug support, generate
_EJ0 method so that it will mark CPU for removal by firmware and
pass control to it by triggering SMI.
Signed-off-by: Igor Mammedov <imamm...@redhat.com>
---
include/hw/acpi/cpu.h | 1 +
hw/acpi/cpu.c | 15 +++++++++++++--
hw/i386/acpi-build.c | 1 +
3 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/include/hw/acpi/cpu.h b/include/hw/acpi/cpu.h
index d71edde456..999caaf510 100644
--- a/include/hw/acpi/cpu.h
+++ b/include/hw/acpi/cpu.h
@@ -51,6 +51,7 @@ void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
typedef struct CPUHotplugFeatures {
bool acpi_1_compatible;
bool has_legacy_cphp;
+ bool fw_unplugs_cpu;
const char *smi_path;
} CPUHotplugFeatures;
diff --git a/hw/acpi/cpu.c b/hw/acpi/cpu.c
index 811218f673..bded2a837f 100644
--- a/hw/acpi/cpu.c
+++ b/hw/acpi/cpu.c
@@ -341,6 +341,7 @@ const VMStateDescription vmstate_cpu_hotplug = {
#define CPU_INSERT_EVENT "CINS"
#define CPU_REMOVE_EVENT "CRMV"
#define CPU_EJECT_EVENT "CEJ0"
+#define CPU_FW_EJECT_EVENT "CEJF"
void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
hwaddr io_base,
@@ -393,7 +394,10 @@ void build_cpus_aml(Aml *table, MachineState *machine,
CPUHotplugFeatures opts,
aml_append(field, aml_named_field(CPU_REMOVE_EVENT, 1));
Bit 2: Device remove event, used to distinguish device for which
no device eject request to OSPM was issued. Firmware must
ignore this bit.
/* initiates device eject, write only */
aml_append(field, aml_named_field(CPU_EJECT_EVENT, 1));
Bit 3: reserved and should be ignored by OSPM
- aml_append(field, aml_reserved_field(4));
+ aml_append(field, aml_reserved_field(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(2));
Shouldn't this be instead:
- aml_append(field, aml_reserved_field(4));
+ /* 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));
Bit 4: if set to 1, OSPM requests firmware to perform device eject.
Bit 5-7: reserved and should be ignored by OSPM
Otherwise AFAICS CPU_FW_EJECT_EVENT would correspond to bit 5.
Ankur
aml_append(field, aml_named_field(CPU_COMMAND, 8));
aml_append(cpu_ctrl_dev, field);
@@ -428,6 +432,7 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
Aml *ins_evt = aml_name("%s.%s", cphp_res_path, CPU_INSERT_EVENT);
Aml *rm_evt = aml_name("%s.%s", cphp_res_path, CPU_REMOVE_EVENT);
Aml *ej_evt = aml_name("%s.%s", cphp_res_path, CPU_EJECT_EVENT);
+ Aml *fw_ej_evt = aml_name("%s.%s", cphp_res_path, CPU_FW_EJECT_EVENT);
aml_append(cpus_dev, aml_name_decl("_HID", aml_string("ACPI0010")));
aml_append(cpus_dev, aml_name_decl("_CID", aml_eisaid("PNP0A05")));
@@ -470,7 +475,13 @@ void build_cpus_aml(Aml *table, MachineState *machine,
CPUHotplugFeatures opts,
aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
aml_append(method, aml_store(idx, cpu_selector));
- aml_append(method, aml_store(one, ej_evt));
+ if (opts.fw_unplugs_cpu) {
+ aml_append(method, aml_store(one, fw_ej_evt));
+ aml_append(method, aml_store(aml_int(OVMF_CPUHP_SMI_CMD),
+ aml_name("%s", opts.smi_path)));
+ } else {
+ aml_append(method, aml_store(one, ej_evt));
+ }
aml_append(method, aml_release(ctrl_lock));
}
aml_append(cpus_dev, method);
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 9036e5594c..475e76f514 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1586,6 +1586,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
CPUHotplugFeatures opts = {
.acpi_1_compatible = true, .has_legacy_cphp = true,
.smi_path = pm->smi_on_cpuhp ? "\\_SB.PCI0.SMI0.SMIC" : NULL,
+ .fw_unplugs_cpu = pm->smi_on_cpu_unplug,
};
build_cpus_aml(dsdt, machine, opts, pm->cpu_hp_io_base,
"\\_SB.PCI0", "\\_GPE._E02");
