[PATCH 5/5] hw/i386: expose a "smbios_ep" PC machine property

["Daniel P. Berrangé" <berrange@redhat.com>]

The i440fx and Q35 machine types are both hardcoded to use the legacy
SMBIOS 2.1 entry point. This is a sensible conservative choice because
SeaBIOS only supports SMBIOS 2.1

EDK2, however, can also support SMBIOS 3.0 and QEMU already uses this on
the ARM virt machine type.

This adds a property to allow the choice of SMBIOS entry point versions
For example to opt in to version 3.0

   $QEMU -machine q35,smbios_ep=3_0

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 hw/i386/pc.c         | 26 ++++++++++++++++++++++++++
 hw/i386/pc_piix.c    |  2 +-
 hw/i386/pc_q35.c     |  2 +-
 include/hw/i386/pc.h |  3 +++
 4 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index d11daacc23..cfce279eed 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -81,6 +81,7 @@
 #include "hw/mem/nvdimm.h"
 #include "qapi/error.h"
 #include "qapi/qapi-visit-common.h"
+#include "qapi/qapi-visit-machine.h"
 #include "qapi/visitor.h"
 #include "hw/core/cpu.h"
 #include "hw/usb.h"
@@ -1834,6 +1835,23 @@ static void pc_machine_set_pit(Object *obj, bool value, Error **errp)
     pcms->pit_enabled = value;
 }
 
+static void pc_machine_get_smbios_ep(Object *obj, Visitor *v, const char *name,
+                                     void *opaque, Error **errp)
+{
+    PCMachineState *pcms = PC_MACHINE(obj);
+    SmbiosEntryPointType smbios_ep = pcms->smbios_ep;
+
+    visit_type_SmbiosEntryPointType(v, name, &smbios_ep, errp);
+}
+
+static void pc_machine_set_smbios_ep(Object *obj, Visitor *v, const char *name,
+                                     void *opaque, Error **errp)
+{
+    PCMachineState *pcms = PC_MACHINE(obj);
+
+    visit_type_SmbiosEntryPointType(v, name, &pcms->smbios_ep, errp);
+}
+
 static void pc_machine_get_max_ram_below_4g(Object *obj, Visitor *v,
                                             const char *name, void *opaque,
                                             Error **errp)
@@ -1879,6 +1897,8 @@ static void pc_machine_initfn(Object *obj)
     pcms->vmport = ON_OFF_AUTO_OFF;
 #endif /* CONFIG_VMPORT */
     pcms->max_ram_below_4g = 0; /* use default */
+    pcms->smbios_ep = SMBIOS_ENTRY_POINT_TYPE_2_1;
+
     /* acpi build is enabled by default if machine supports it */
     pcms->acpi_build_enabled = PC_MACHINE_GET_CLASS(pcms)->has_acpi_build;
     pcms->smbus_enabled = true;
@@ -2004,6 +2024,12 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
 
     object_class_property_add_bool(oc, PC_MACHINE_PIT,
         pc_machine_get_pit, pc_machine_set_pit);
+
+    object_class_property_add(oc, PC_MACHINE_SMBIOS_EP, "str",
+        pc_machine_get_smbios_ep, pc_machine_set_smbios_ep,
+        NULL, NULL);
+    object_class_property_set_description(oc, PC_MACHINE_SMBIOS_EP,
+        "SMBIOS Entry Point version [v2_1, v3_0]");
 }
 
 static const TypeInfo pc_machine_info = {
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 1c5bc6ae6e..3626e5425f 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -179,7 +179,7 @@ static void pc_init1(MachineState *machine,
         smbios_set_defaults("QEMU", "Standard PC (i440FX + PIIX, 1996)",
                             mc->name, pcmc->smbios_legacy_mode,
                             pcmc->smbios_uuid_encoded,
-                            SMBIOS_ENTRY_POINT_TYPE_2_1);
+                            pcms->smbios_ep);
     }
 
     /* allocate ram and load rom/bios */
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index cc202407c7..7cf08fa364 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -204,7 +204,7 @@ static void pc_q35_init(MachineState *machine)
         smbios_set_defaults("QEMU", "Standard PC (Q35 + ICH9, 2009)",
                             mc->name, pcmc->smbios_legacy_mode,
                             pcmc->smbios_uuid_encoded,
-                            SMBIOS_ENTRY_POINT_TYPE_2_1);
+                            pcms->smbios_ep);
     }
 
     /* allocate ram and load rom/bios */
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index fe52e165b2..f5d2ebcb49 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -10,6 +10,7 @@
 
 #include "hw/acpi/acpi_dev_interface.h"
 #include "hw/hotplug.h"
+#include "hw/firmware/smbios.h"
 
 #define HPET_INTCAP "hpet-intcap"
 
@@ -38,6 +39,7 @@ struct PCMachineState {
     /* Configuration options: */
     uint64_t max_ram_below_4g;
     OnOffAuto vmport;
+    SmbiosEntryPointType smbios_ep;
 
     bool acpi_build_enabled;
     bool smbus_enabled;
@@ -59,6 +61,7 @@ struct PCMachineState {
 #define PC_MACHINE_SMBUS            "smbus"
 #define PC_MACHINE_SATA             "sata"
 #define PC_MACHINE_PIT              "pit"
+#define PC_MACHINE_SMBIOS_EP        "smbios-ep"
 
 /**
  * PCMachineClass:
-- 
2.26.2