diff --git a/etc/metadefs/compute-libvirt.json b/etc/metadefs/compute-libvirt.json
index 419c40fec2..c6f4559c73 100644
--- a/etc/metadefs/compute-libvirt.json
+++ b/etc/metadefs/compute-libvirt.json
@@ -54,8 +54,9 @@
         },
         "hw_video_ram": {
             "title": "Max Video Ram",
-            "description": "Maximum RAM for the video image. Used only if a hw_video:ram_max_mb value has been set in the flavor's extra_specs and that value is higher than the value set in hw_video_ram.",
-            "type": "integer"
+            "description": "Maximum RAM (unit: MB) for the video image. Used only if a hw_video:ram_max_mb value has been set in the flavor's extra_specs and that value is higher than the value set in hw_video_ram.",
+            "type": "integer",
+            "minimum": 0
         },
         "os_command_line": {
             "title": "Kernel Command Line",
@@ -64,23 +65,17 @@
         },
         "hw_vif_model": {
             "title": "Virtual Network Interface",
-            "description": "Specifies the model of virtual network interface device to use. The valid options depend on the configured hypervisor. KVM and QEMU: e1000, ne2k_pci, pcnet, rtl8139, and virtio. VMware: e1000, e1000e, VirtualE1000, VirtualE1000e, VirtualPCNet32, VirtualSriovEthernetCard, and VirtualVmxnet. Xen: e1000, netfront, ne2k_pci, pcnet, and rtl8139.",
+            "description": "Specifies the model of virtual network interface device to use. The valid options depend on the hypervisor configuration. libvirt driver options: KVM and QEMU: e1000, ne2k_pci, pcnet, rtl8139, spapr-vlan, and virtio. Xen: e1000, netfront, ne2k_pci, pcnet, and rtl8139.",
             "type": "string",
             "enum": [
                 "e1000",
+                "e1000e",
                 "ne2k_pci",
+                "netfront",
                 "pcnet",
                 "rtl8139",
-                "virtio",
-                "e1000",
-                "e1000e",
-                "VirtualE1000",
-                "VirtualE1000e",
-                "VirtualPCNet32",
-                "VirtualSriovEthernetCard",
-                "VirtualVmxnet",
-                "netfront",
-                "ne2k_pci"
+                "spapr-vlan",
+                "virtio"
             ]
         },
         "hw_qemu_guest_agent": {
diff --git a/etc/metadefs/compute-vmware.json b/etc/metadefs/compute-vmware.json
index 358a4aa4bf..fefa0a0f3e 100644
--- a/etc/metadefs/compute-vmware.json
+++ b/etc/metadefs/compute-vmware.json
@@ -18,13 +18,42 @@
                 "lsiLogic",
                 "busLogic",
                 "ide"
-            ]
+            ],
+            "default" : "lsiLogic"
+        },
+        "vmware_disktype": {
+            "title": "Disk Provisioning Type",
+            "description": "When performing operations such as creating a virtual disk, cloning, or migrating, the disk provisioning type may be specified. Please refer to VMware documentation for more.",
+            "type": "string",
+            "enum": [
+                "thin",
+                "preallocated",
+                "thick",
+                "eagerZeroedThick",
+                "sparse"
+            ],
+            "default" : "preallocated"
         },
         "vmware_ostype": {
             "title": "OS Type",
             "description": "A VMware GuestID which describes the operating system installed in the image. This value is passed to the hypervisor when creating a virtual machine. If not specified, the key defaults to otherGuest. See thinkvirt.com.",
             "type": "string",
             "default": "otherGuest"
+        },
+        "hw_vif_model": {
+            "title": "Virtual Network Interface",
+            "description": "Specifies the model of virtual network interface device to use. The valid options depend on the hypervisor. VMware driver supported options: e1000, e1000e, VirtualE1000, VirtualE1000e, VirtualPCNet32, VirtualSriovEthernetCard, and VirtualVmxnet.",
+            "type": "string",
+            "enum": [
+                "e1000",
+                "e1000e",
+                "VirtualE1000",
+                "VirtualE1000e",
+                "VirtualPCNet32",
+                "VirtualSriovEthernetCard",
+                "VirtualVmxnet"
+            ],
+            "default" : "e1000"
         }
     },
     "objects": []