xl/libxl: Add OEM string support to smbios

Add support for OEM strings in the SMBIOS type 11.

hvmloader checks them sequentially, so hide the implementation detail.
Allow multiple plain oem= items and assign the numeric values
internally.

Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

docs/man/xl.cfg.5.pod.in

@@ -2122,6 +2122,10 @@ Each B<SMBIOS_SPEC_STRING> is a C<KEY=VALUE> string from the following list:
 
 =item B<battery_device_name=STRING>
 
+=item B<oem=STRING>
+
+oem= can be specified up to 99 times.
+
 =back
 
 =item B<ms_vm_genid="OPTION">

tools/golang/xenlight/types.gen.go

@@ -411,6 +411,7 @@ SmbiosTypeEnclosureSerialNumber SmbiosType = 14
 SmbiosTypeEnclosureAssetTag SmbiosType = 15
 SmbiosTypeBatteryManufacturer SmbiosType = 16
 SmbiosTypeBatteryDeviceName SmbiosType = 17
+SmbiosTypeOem SmbiosType = 18
 )
 
 type Smbios struct {

tools/libs/light/libxl_dom.c

@@ -755,6 +755,7 @@ static int hvm_build_set_xs_values(libxl__gc *gc,
                                    const libxl_domain_build_info *info)
 {
     char *path = NULL;
+    int num_oem = 1;
     int ret = 0;
 
     if (dom->smbios_module.guest_addr_out) {
@@ -775,8 +776,19 @@ static int hvm_build_set_xs_values(libxl__gc *gc,
 
     for (int i = 0; i < info->u.hvm.num_smbios; i++) {
         char *p;
-        path = GCSPRINTF("/local/domain/%d/"HVM_XS_BIOS_STRINGS"/%s", domid,
-                   libxl_smbios_type_to_string(info->u.hvm.smbios[i].key));
+        if (info->u.hvm.smbios[i].key == LIBXL_SMBIOS_TYPE_OEM) {
+            if (num_oem > 99) {
+                LOGD(ERROR, domid, "More than 99 SMBIOS OEM strings specified");
+                ret = ERROR_INVAL;
+                goto err;
+            }
+            path = GCSPRINTF("/local/domain/%d/"HVM_XS_OEM_STRINGS, domid,
+                             num_oem);
+            num_oem++;
+        } else {
+            path = GCSPRINTF("/local/domain/%d/"HVM_XS_BIOS_STRINGS"/%s", domid,
+                       libxl_smbios_type_to_string(info->u.hvm.smbios[i].key));
+        }
 
         /* Convert libxl_smbios_type string to xenstore path that hvmloader
          * will use, as defined by HVM_XS_*. That is convert the '_' to '-'. */

tools/libs/light/libxl_types.idl

@@ -441,6 +441,7 @@ libxl_smbios_type = Enumeration("smbios_type", [
     (15, "enclosure_asset_tag"),
     (16, "battery_manufacturer"),
     (17, "battery_device_name"),
+    (18, "oem"),
     ])
 
 libxl_smbios = Struct("smbios", [

tools/xl/xl_parse.c

@@ -1864,6 +1864,9 @@ void parse_config_data(const char *config_source,
         switch (xlu_cfg_get_list(config, "smbios", &smbios, &num_smbios, 0))
         {
         case 0: /* Success */
+        {
+            unsigned int num_oem = 1;
+
             b_info->u.hvm.num_smbios = num_smbios;
             b_info->u.hvm.smbios = xcalloc(num_smbios, sizeof(libxl_smbios));
             for (i = 0; i < num_smbios; i++) {
@@ -1903,12 +1906,22 @@ void parse_config_data(const char *config_source,
                     exit(EXIT_FAILURE);
                 }
 
+                if (type == LIBXL_SMBIOS_TYPE_OEM) {
+                    if (num_oem > 99) {
+                        fprintf(stderr,
+                                "xl: smbios limited to 99 oem strings\n");
+                        exit(EXIT_FAILURE);
+                    }
+                    num_oem++;
+                }
+
                 b_info->u.hvm.smbios[i].key = type;
                 b_info->u.hvm.smbios[i].value = xstrdup(value);
 
                 free(option);
             }
             break;
+        }
         case ESRCH: /* Option not present */
             break;
         default: