[PATCH v6 08/11] x86: acpi: introduce the PCI0.SMI0 ACPI device

[Igor Mammedov <imammedo@redhat.com>]

When CPU hotplug with SMI has been negotiated, describe the SMI
register block in the DSDT. Pass the ACPI name of the SMI control
register to build_cpus_aml(), so that CPU_SCAN_METHOD can access the
register in the next patch.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
---
 include/hw/acpi/cpu.h |  1 +
 hw/i386/acpi-build.c  | 29 ++++++++++++++++++++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/include/hw/acpi/cpu.h b/include/hw/acpi/cpu.h
index 62f0278ba2..0eeedaa491 100644
--- a/include/hw/acpi/cpu.h
+++ b/include/hw/acpi/cpu.h
@@ -50,6 +50,7 @@ void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
 typedef struct CPUHotplugFeatures {
     bool acpi_1_compatible;
     bool has_legacy_cphp;
+    const char *smi_path;
 } CPUHotplugFeatures;
 
 void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index b408d62560..b49d360ab2 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1521,6 +1521,32 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
         aml_append(dev, aml_name_decl("_UID", aml_int(0)));
         aml_append(dev, build_q35_osc_method());
         aml_append(sb_scope, dev);
+
+        if (pm->smi_on_cpuhp) {
+            /* reserve SMI block resources, IO ports 0xB2, 0xB3 */
+            dev = aml_device("PCI0.SMI0");
+            aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A06")));
+            aml_append(dev, aml_name_decl("_UID", aml_string("SMI resources")));
+            crs = aml_resource_template();
+            aml_append(crs,
+                aml_io(
+                       AML_DECODE16,
+                       ACPI_PORT_SMI_CMD,
+                       ACPI_PORT_SMI_CMD,
+                       1,
+                       2)
+            );
+            aml_append(dev, aml_name_decl("_CRS", crs));
+            aml_append(dev, aml_operation_region("SMIR", AML_SYSTEM_IO,
+                aml_int(ACPI_PORT_SMI_CMD), 2));
+            field = aml_field("SMIR", AML_BYTE_ACC, AML_NOLOCK,
+                              AML_WRITE_AS_ZEROS);
+            aml_append(field, aml_named_field("SMIC", 8));
+            aml_append(field, aml_reserved_field(8));
+            aml_append(dev, field);
+            aml_append(sb_scope, dev);
+        }
+
         aml_append(dsdt, sb_scope);
 
         build_hpet_aml(dsdt);
@@ -1536,7 +1562,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
         build_legacy_cpu_hotplug_aml(dsdt, machine, pm->cpu_hp_io_base);
     } else {
         CPUHotplugFeatures opts = {
-            .acpi_1_compatible = true, .has_legacy_cphp = true
+            .acpi_1_compatible = true, .has_legacy_cphp = true,
+            .smi_path = pm->smi_on_cpuhp ? "\\_SB.PCI0.SMI0.SMIC" : NULL,
         };
         build_cpus_aml(dsdt, machine, opts, pm->cpu_hp_io_base,
                        "\\_SB.PCI0", "\\_GPE._E02");
-- 
2.27.0