conf: Add VIR_DOMAIN_DEF_FEATURE_NET_MODEL_STRING

This requires drivers to opt in to handle the raw modelstr
network model, all others will error if a passed in XML value
is not in the model enum.

Enable this feature for libxl/xen/xm and qemu drivers
Acked-by: NMichal Privoznik <mprivozn@redhat.com>
Signed-off-by: NCole Robinson <crobinso@redhat.com>

src/conf/domain_conf.c

@@ -5365,6 +5365,15 @@ virDomainDeviceDefPostParseCheckFeatures(virDomainDeviceDefPtr dev,
         virDomainDeviceDefCheckUnsupportedMemoryDevice(dev) < 0)
         return -1;
 
+    if (UNSUPPORTED(VIR_DOMAIN_DEF_FEATURE_NET_MODEL_STRING) &&
+        dev->type == VIR_DOMAIN_DEVICE_NET &&
+        dev->data.net->modelstr) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("driver does not support net model '%s'"),
+                       dev->data.net->modelstr);
+        return -1;
+    }
+
     return 0;
 }
 #undef UNSUPPORTED

src/conf/domain_conf.h

@@ -2580,6 +2580,7 @@ typedef enum {
     VIR_DOMAIN_DEF_FEATURE_USER_ALIAS = (1 << 5),
     VIR_DOMAIN_DEF_FEATURE_NO_BOOT_ORDER = (1 << 6),
     VIR_DOMAIN_DEF_FEATURE_FW_AUTOSELECT = (1 << 7),
+    VIR_DOMAIN_DEF_FEATURE_NET_MODEL_STRING = (1 << 8),
 } virDomainDefFeatures;
 
 

src/libxl/libxl_domain.c

@@ -431,6 +431,7 @@ virDomainDefParserConfig libxlDomainDefParserConfig = {
     .macPrefix = { 0x00, 0x16, 0x3e },
     .devicesPostParseCallback = libxlDomainDeviceDefPostParse,
     .domainPostParseCallback = libxlDomainDefPostParse,
+    .features = VIR_DOMAIN_DEF_FEATURE_NET_MODEL_STRING,
 };
 
 

src/qemu/qemu_domain.c

@@ -6962,7 +6962,8 @@ virDomainDefParserConfig virQEMUDriverDomainDefParserConfig = {
                 VIR_DOMAIN_DEF_FEATURE_OFFLINE_VCPUPIN |
                 VIR_DOMAIN_DEF_FEATURE_INDIVIDUAL_VCPUS |
                 VIR_DOMAIN_DEF_FEATURE_USER_ALIAS |
-                VIR_DOMAIN_DEF_FEATURE_FW_AUTOSELECT,
+                VIR_DOMAIN_DEF_FEATURE_FW_AUTOSELECT |
+                VIR_DOMAIN_DEF_FEATURE_NET_MODEL_STRING,
 };
 
 

src/security/virt-aa-helper.c

@@ -645,7 +645,8 @@ caps_mockup(vahControl * ctl, const char *xmlStr)
 virDomainDefParserConfig virAAHelperDomainDefParserConfig = {
     .features = VIR_DOMAIN_DEF_FEATURE_MEMORY_HOTPLUG |
                 VIR_DOMAIN_DEF_FEATURE_OFFLINE_VCPUPIN |
-                VIR_DOMAIN_DEF_FEATURE_INDIVIDUAL_VCPUS,
+                VIR_DOMAIN_DEF_FEATURE_INDIVIDUAL_VCPUS |
+                VIR_DOMAIN_DEF_FEATURE_NET_MODEL_STRING,
 };
 
 static int