mach-virt: Set VM's SMBIOS system version to mc->name

Instead of using "1.0" as the system version of SMBIOS, we should use
mc->name for mach-virt machine type to be consistent other architectures.
With this patch, "dmidecode -t 1" (e.g., "-M virt-2.12,accel=kvm") will
show:

    Handle 0x0100, DMI type 1, 27 bytes
    System Information
            Manufacturer: QEMU
            Product Name: KVM Virtual Machine
            Version: virt-2.12
            Serial Number: Not Specified
            ...

instead of:

    Handle 0x0100, DMI type 1, 27 bytes
    System Information
            Manufacturer: QEMU
            Product Name: KVM Virtual Machine
            Version: 1.0
            Serial Number: Not Specified
            ...

For backward compatibility, we allow older machine types to keep "1.0"
as the default system version.
Signed-off-by: NWei Huang <wei@redhat.com>
Reviewed-by: NAndrew Jones <drjones@redhat.com>
Message-id: 20180322212318.7182-1-wei@redhat.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/virt.c

@@ -1132,6 +1132,8 @@ static void *machvirt_dtb(const struct arm_boot_info *binfo, int *fdt_size)
 
 static void virt_build_smbios(VirtMachineState *vms)
 {
+    MachineClass *mc = MACHINE_GET_CLASS(vms);
+    VirtMachineClass *vmc = VIRT_MACHINE_GET_CLASS(vms);
     uint8_t *smbios_tables, *smbios_anchor;
     size_t smbios_tables_len, smbios_anchor_len;
     const char *product = "QEMU Virtual Machine";
@@ -1145,7 +1147,8 @@ static void virt_build_smbios(VirtMachineState *vms)
     }
 
     smbios_set_defaults("QEMU", product,
-                        "1.0", false, true, SMBIOS_ENTRY_POINT_30);
+                        vmc->smbios_old_sys_ver ? "1.0" : mc->name, false,
+                        true, SMBIOS_ENTRY_POINT_30);
 
     smbios_get_tables(NULL, 0, &smbios_tables, &smbios_tables_len,
                       &smbios_anchor, &smbios_anchor_len);
@@ -1646,8 +1649,11 @@ static void virt_2_11_instance_init(Object *obj)
 
 static void virt_machine_2_11_options(MachineClass *mc)
 {
+    VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
+
     virt_machine_2_12_options(mc);
     SET_MACHINE_COMPAT(mc, VIRT_COMPAT_2_11);
+    vmc->smbios_old_sys_ver = true;
 }
 DEFINE_VIRT_MACHINE(2, 11)
 

include/hw/arm/virt.h

@@ -85,6 +85,7 @@ typedef struct {
     bool no_its;
     bool no_pmu;
     bool claim_edge_triggered_timers;
+    bool smbios_old_sys_ver;
 } VirtMachineClass;
 
 typedef struct {