diff --git a/csi.proto b/csi.proto
index 0a67d37b..71ad3d3d 100644
--- a/csi.proto
+++ b/csi.proto
@@ -631,30 +631,51 @@ message ValidateVolumeCapabilitiesRequest {
   // The ID of the volume to check. This field is REQUIRED.
   string volume_id = 1;
 
+  // Attributes of the volume to check. This field is OPTIONAL and MUST
+  // match the attributes of the Volume identified by `volume_id`.
+  map<string, string> volume_attributes = 2;
+
   // The capabilities that the CO wants to check for the volume. This
-  // call SHALL return "supported" only if all the volume capabilities
+  // call SHALL return "confirmed" only if all the volume capabilities
   // specified below are supported. This field is REQUIRED.
-  repeated VolumeCapability volume_capabilities = 2;
+  repeated VolumeCapability volume_capabilities = 3;
 
-  // Attributes of the volume to check. This field is OPTIONAL and MUST
-  // match the attributes of the Volume identified by `volume_id`.
-  map<string, string> volume_attributes = 3;
+  // See CreateVolumeRequest.parameters.
+  // This field is OPTIONAL.
+  map<string, string> parameters = 4;
 
-  // Specifies where (regions, zones, racks, etc.) the caller believes
-  // the volume is accessible from.
-  // A caller MAY specify multiple topologies to indicate they believe
-  // the volume to be accessible from multiple locations.
-  // This field is OPTIONAL. This field SHALL NOT be set unless the
-  // plugin advertises the ACCESSIBILITY_CONSTRAINTS capability.
-  repeated Topology accessible_topology = 4;
+  // Secrets required by plugin to complete volume validation request.
+  // This field is OPTIONAL. Refer to the `Secrets Requirements`
+  // section on how to use this field.
+  map<string, string> controller_validate_secrets = 5;
 }
 
 message ValidateVolumeCapabilitiesResponse {
-  // True if the Plugin supports the specified capabilities for the
-  // given volume. This field is REQUIRED.
-  bool supported = 1;
+  message Confirmed {
+    // Volume attributes validated by the plugin.
+    // This field is OPTIONAL.
+    map<string, string> volume_attributes = 1;
+
+    // Volume capabilities supported by the plugin.
+    // This field is REQUIRED.
+    repeated VolumeCapability volume_capabilities = 2;
+
+    // The volume creation parameters validated by the plugin.
+    // This field is OPTIONAL.
+    map<string, string> parameters = 3;
+  }
+
+  // Confirmed indicates to the CO the set of capabilities that the
+  // plugin has validated. This field SHALL only be set to a non-empty
+  // value for successful validation responses.
+  // For successful validation responses, the CO SHALL compare the
+  // fields of this message to the originally requested capabilities in
+  // order to guard against an older plugin reporting "valid" for newer
+  // capability fields that it does not yet understand.
+  // This field is OPTIONAL.
+  Confirmed confirmed = 1;
 
-  // Message to the CO if `supported` above is false. This field is
+  // Message to the CO if `confirmed` above is empty. This field is
   // OPTIONAL.
   // An empty string is equal to an unspecified field value.
   string message = 2;
diff --git a/lib/go/csi/v0/csi.pb.go b/lib/go/csi/v0/csi.pb.go
index deb66fba..c58d0537 100644
--- a/lib/go/csi/v0/csi.pb.go
+++ b/lib/go/csi/v0/csi.pb.go
@@ -61,7 +61,7 @@ func (x PluginCapability_Service_Type) String() string {
 	return proto.EnumName(PluginCapability_Service_Type_name, int32(x))
 }
 func (PluginCapability_Service_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{4, 0, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{4, 0, 0}
 }
 
 type VolumeCapability_AccessMode_Mode int32
@@ -105,7 +105,7 @@ func (x VolumeCapability_AccessMode_Mode) String() string {
 	return proto.EnumName(VolumeCapability_AccessMode_Mode_name, int32(x))
 }
 func (VolumeCapability_AccessMode_Mode) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{10, 2, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{10, 2, 0}
 }
 
 type ControllerServiceCapability_RPC_Type int32
@@ -151,7 +151,7 @@ func (x ControllerServiceCapability_RPC_Type) String() string {
 	return proto.EnumName(ControllerServiceCapability_RPC_Type_name, int32(x))
 }
 func (ControllerServiceCapability_RPC_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{29, 0, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{29, 0, 0}
 }
 
 type SnapshotStatus_Type int32
@@ -193,7 +193,7 @@ func (x SnapshotStatus_Type) String() string {
 	return proto.EnumName(SnapshotStatus_Type_name, int32(x))
 }
 func (SnapshotStatus_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{33, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{33, 0}
 }
 
 type VolumeUsage_Unit int32
@@ -219,7 +219,7 @@ func (x VolumeUsage_Unit) String() string {
 	return proto.EnumName(VolumeUsage_Unit_name, int32(x))
 }
 func (VolumeUsage_Unit) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{48, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{48, 0}
 }
 
 type NodeServiceCapability_RPC_Type int32
@@ -248,7 +248,7 @@ func (x NodeServiceCapability_RPC_Type) String() string {
 	return proto.EnumName(NodeServiceCapability_RPC_Type_name, int32(x))
 }
 func (NodeServiceCapability_RPC_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{53, 0, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{53, 0, 0}
 }
 
 type GetPluginInfoRequest struct {
@@ -261,7 +261,7 @@ func (m *GetPluginInfoRequest) Reset()         { *m = GetPluginInfoRequest{} }
 func (m *GetPluginInfoRequest) String() string { return proto.CompactTextString(m) }
 func (*GetPluginInfoRequest) ProtoMessage()    {}
 func (*GetPluginInfoRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{0}
 }
 func (m *GetPluginInfoRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetPluginInfoRequest.Unmarshal(m, b)
@@ -303,7 +303,7 @@ func (m *GetPluginInfoResponse) Reset()         { *m = GetPluginInfoResponse{} }
 func (m *GetPluginInfoResponse) String() string { return proto.CompactTextString(m) }
 func (*GetPluginInfoResponse) ProtoMessage()    {}
 func (*GetPluginInfoResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{1}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{1}
 }
 func (m *GetPluginInfoResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetPluginInfoResponse.Unmarshal(m, b)
@@ -354,7 +354,7 @@ func (m *GetPluginCapabilitiesRequest) Reset()         { *m = GetPluginCapabilit
 func (m *GetPluginCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*GetPluginCapabilitiesRequest) ProtoMessage()    {}
 func (*GetPluginCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{2}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{2}
 }
 func (m *GetPluginCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetPluginCapabilitiesRequest.Unmarshal(m, b)
@@ -387,7 +387,7 @@ func (m *GetPluginCapabilitiesResponse) Reset()         { *m = GetPluginCapabili
 func (m *GetPluginCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*GetPluginCapabilitiesResponse) ProtoMessage()    {}
 func (*GetPluginCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{3}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{3}
 }
 func (m *GetPluginCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetPluginCapabilitiesResponse.Unmarshal(m, b)
@@ -428,7 +428,7 @@ func (m *PluginCapability) Reset()         { *m = PluginCapability{} }
 func (m *PluginCapability) String() string { return proto.CompactTextString(m) }
 func (*PluginCapability) ProtoMessage()    {}
 func (*PluginCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{4}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{4}
 }
 func (m *PluginCapability) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_PluginCapability.Unmarshal(m, b)
@@ -538,7 +538,7 @@ func (m *PluginCapability_Service) Reset()         { *m = PluginCapability_Servi
 func (m *PluginCapability_Service) String() string { return proto.CompactTextString(m) }
 func (*PluginCapability_Service) ProtoMessage()    {}
 func (*PluginCapability_Service) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{4, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{4, 0}
 }
 func (m *PluginCapability_Service) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_PluginCapability_Service.Unmarshal(m, b)
@@ -575,7 +575,7 @@ func (m *ProbeRequest) Reset()         { *m = ProbeRequest{} }
 func (m *ProbeRequest) String() string { return proto.CompactTextString(m) }
 func (*ProbeRequest) ProtoMessage()    {}
 func (*ProbeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{5}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{5}
 }
 func (m *ProbeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ProbeRequest.Unmarshal(m, b)
@@ -626,7 +626,7 @@ func (m *ProbeResponse) Reset()         { *m = ProbeResponse{} }
 func (m *ProbeResponse) String() string { return proto.CompactTextString(m) }
 func (*ProbeResponse) ProtoMessage()    {}
 func (*ProbeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{6}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{6}
 }
 func (m *ProbeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ProbeResponse.Unmarshal(m, b)
@@ -712,7 +712,7 @@ func (m *CreateVolumeRequest) Reset()         { *m = CreateVolumeRequest{} }
 func (m *CreateVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*CreateVolumeRequest) ProtoMessage()    {}
 func (*CreateVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{7}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{7}
 }
 func (m *CreateVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CreateVolumeRequest.Unmarshal(m, b)
@@ -796,7 +796,7 @@ func (m *VolumeContentSource) Reset()         { *m = VolumeContentSource{} }
 func (m *VolumeContentSource) String() string { return proto.CompactTextString(m) }
 func (*VolumeContentSource) ProtoMessage()    {}
 func (*VolumeContentSource) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{8}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{8}
 }
 func (m *VolumeContentSource) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeContentSource.Unmarshal(m, b)
@@ -910,7 +910,7 @@ func (m *VolumeContentSource_SnapshotSource) Reset()         { *m = VolumeConten
 func (m *VolumeContentSource_SnapshotSource) String() string { return proto.CompactTextString(m) }
 func (*VolumeContentSource_SnapshotSource) ProtoMessage()    {}
 func (*VolumeContentSource_SnapshotSource) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{8, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{8, 0}
 }
 func (m *VolumeContentSource_SnapshotSource) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeContentSource_SnapshotSource.Unmarshal(m, b)
@@ -951,7 +951,7 @@ func (m *CreateVolumeResponse) Reset()         { *m = CreateVolumeResponse{} }
 func (m *CreateVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*CreateVolumeResponse) ProtoMessage()    {}
 func (*CreateVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{9}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{9}
 }
 func (m *CreateVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CreateVolumeResponse.Unmarshal(m, b)
@@ -998,7 +998,7 @@ func (m *VolumeCapability) Reset()         { *m = VolumeCapability{} }
 func (m *VolumeCapability) String() string { return proto.CompactTextString(m) }
 func (*VolumeCapability) ProtoMessage()    {}
 func (*VolumeCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{10}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{10}
 }
 func (m *VolumeCapability) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeCapability.Unmarshal(m, b)
@@ -1147,7 +1147,7 @@ func (m *VolumeCapability_BlockVolume) Reset()         { *m = VolumeCapability_B
 func (m *VolumeCapability_BlockVolume) String() string { return proto.CompactTextString(m) }
 func (*VolumeCapability_BlockVolume) ProtoMessage()    {}
 func (*VolumeCapability_BlockVolume) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{10, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{10, 0}
 }
 func (m *VolumeCapability_BlockVolume) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeCapability_BlockVolume.Unmarshal(m, b)
@@ -1187,7 +1187,7 @@ func (m *VolumeCapability_MountVolume) Reset()         { *m = VolumeCapability_M
 func (m *VolumeCapability_MountVolume) String() string { return proto.CompactTextString(m) }
 func (*VolumeCapability_MountVolume) ProtoMessage()    {}
 func (*VolumeCapability_MountVolume) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{10, 1}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{10, 1}
 }
 func (m *VolumeCapability_MountVolume) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeCapability_MountVolume.Unmarshal(m, b)
@@ -1234,7 +1234,7 @@ func (m *VolumeCapability_AccessMode) Reset()         { *m = VolumeCapability_Ac
 func (m *VolumeCapability_AccessMode) String() string { return proto.CompactTextString(m) }
 func (*VolumeCapability_AccessMode) ProtoMessage()    {}
 func (*VolumeCapability_AccessMode) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{10, 2}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{10, 2}
 }
 func (m *VolumeCapability_AccessMode) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeCapability_AccessMode.Unmarshal(m, b)
@@ -1282,7 +1282,7 @@ func (m *CapacityRange) Reset()         { *m = CapacityRange{} }
 func (m *CapacityRange) String() string { return proto.CompactTextString(m) }
 func (*CapacityRange) ProtoMessage()    {}
 func (*CapacityRange) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{11}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{11}
 }
 func (m *CapacityRange) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CapacityRange.Unmarshal(m, b)
@@ -1375,7 +1375,7 @@ func (m *Volume) Reset()         { *m = Volume{} }
 func (m *Volume) String() string { return proto.CompactTextString(m) }
 func (*Volume) ProtoMessage()    {}
 func (*Volume) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{12}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{12}
 }
 func (m *Volume) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Volume.Unmarshal(m, b)
@@ -1567,7 +1567,7 @@ func (m *TopologyRequirement) Reset()         { *m = TopologyRequirement{} }
 func (m *TopologyRequirement) String() string { return proto.CompactTextString(m) }
 func (*TopologyRequirement) ProtoMessage()    {}
 func (*TopologyRequirement) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{13}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{13}
 }
 func (m *TopologyRequirement) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_TopologyRequirement.Unmarshal(m, b)
@@ -1641,7 +1641,7 @@ func (m *Topology) Reset()         { *m = Topology{} }
 func (m *Topology) String() string { return proto.CompactTextString(m) }
 func (*Topology) ProtoMessage()    {}
 func (*Topology) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{14}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{14}
 }
 func (m *Topology) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Topology.Unmarshal(m, b)
@@ -1685,7 +1685,7 @@ func (m *DeleteVolumeRequest) Reset()         { *m = DeleteVolumeRequest{} }
 func (m *DeleteVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*DeleteVolumeRequest) ProtoMessage()    {}
 func (*DeleteVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{15}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{15}
 }
 func (m *DeleteVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DeleteVolumeRequest.Unmarshal(m, b)
@@ -1729,7 +1729,7 @@ func (m *DeleteVolumeResponse) Reset()         { *m = DeleteVolumeResponse{} }
 func (m *DeleteVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*DeleteVolumeResponse) ProtoMessage()    {}
 func (*DeleteVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{16}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{16}
 }
 func (m *DeleteVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DeleteVolumeResponse.Unmarshal(m, b)
@@ -1779,7 +1779,7 @@ func (m *ControllerPublishVolumeRequest) Reset()         { *m = ControllerPublis
 func (m *ControllerPublishVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*ControllerPublishVolumeRequest) ProtoMessage()    {}
 func (*ControllerPublishVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{17}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{17}
 }
 func (m *ControllerPublishVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerPublishVolumeRequest.Unmarshal(m, b)
@@ -1856,7 +1856,7 @@ func (m *ControllerPublishVolumeResponse) Reset()         { *m = ControllerPubli
 func (m *ControllerPublishVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*ControllerPublishVolumeResponse) ProtoMessage()    {}
 func (*ControllerPublishVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{18}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{18}
 }
 func (m *ControllerPublishVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerPublishVolumeResponse.Unmarshal(m, b)
@@ -1907,7 +1907,7 @@ func (m *ControllerUnpublishVolumeRequest) Reset()         { *m = ControllerUnpu
 func (m *ControllerUnpublishVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*ControllerUnpublishVolumeRequest) ProtoMessage()    {}
 func (*ControllerUnpublishVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{19}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{19}
 }
 func (m *ControllerUnpublishVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerUnpublishVolumeRequest.Unmarshal(m, b)
@@ -1958,7 +1958,7 @@ func (m *ControllerUnpublishVolumeResponse) Reset()         { *m = ControllerUnp
 func (m *ControllerUnpublishVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*ControllerUnpublishVolumeResponse) ProtoMessage()    {}
 func (*ControllerUnpublishVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{20}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{20}
 }
 func (m *ControllerUnpublishVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerUnpublishVolumeResponse.Unmarshal(m, b)
@@ -1981,30 +1981,30 @@ var xxx_messageInfo_ControllerUnpublishVolumeResponse proto.InternalMessageInfo
 type ValidateVolumeCapabilitiesRequest struct {
 	// The ID of the volume to check. This field is REQUIRED.
 	VolumeId string `protobuf:"bytes,1,opt,name=volume_id,json=volumeId,proto3" json:"volume_id,omitempty"`
-	// The capabilities that the CO wants to check for the volume. This
-	// call SHALL return "supported" only if all the volume capabilities
-	// specified below are supported. This field is REQUIRED.
-	VolumeCapabilities []*VolumeCapability `protobuf:"bytes,2,rep,name=volume_capabilities,json=volumeCapabilities,proto3" json:"volume_capabilities,omitempty"`
 	// Attributes of the volume to check. This field is OPTIONAL and MUST
 	// match the attributes of the Volume identified by `volume_id`.
-	VolumeAttributes map[string]string `protobuf:"bytes,3,rep,name=volume_attributes,json=volumeAttributes,proto3" json:"volume_attributes,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	// Specifies where (regions, zones, racks, etc.) the caller believes
-	// the volume is accessible from.
-	// A caller MAY specify multiple topologies to indicate they believe
-	// the volume to be accessible from multiple locations.
-	// This field is OPTIONAL. This field SHALL NOT be set unless the
-	// plugin advertises the ACCESSIBILITY_CONSTRAINTS capability.
-	AccessibleTopology   []*Topology `protobuf:"bytes,4,rep,name=accessible_topology,json=accessibleTopology,proto3" json:"accessible_topology,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
-	XXX_unrecognized     []byte      `json:"-"`
-	XXX_sizecache        int32       `json:"-"`
+	VolumeAttributes map[string]string `protobuf:"bytes,2,rep,name=volume_attributes,json=volumeAttributes,proto3" json:"volume_attributes,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// The capabilities that the CO wants to check for the volume. This
+	// call SHALL return "confirmed" only if all the volume capabilities
+	// specified below are supported. This field is REQUIRED.
+	VolumeCapabilities []*VolumeCapability `protobuf:"bytes,3,rep,name=volume_capabilities,json=volumeCapabilities,proto3" json:"volume_capabilities,omitempty"`
+	// See CreateVolumeRequest.parameters.
+	// This field is OPTIONAL.
+	Parameters map[string]string `protobuf:"bytes,4,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// Secrets required by plugin to complete volume validation request.
+	// This field is OPTIONAL. Refer to the `Secrets Requirements`
+	// section on how to use this field.
+	ControllerValidateSecrets map[string]string `protobuf:"bytes,5,rep,name=controller_validate_secrets,json=controllerValidateSecrets,proto3" json:"controller_validate_secrets,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral      struct{}          `json:"-"`
+	XXX_unrecognized          []byte            `json:"-"`
+	XXX_sizecache             int32             `json:"-"`
 }
 
 func (m *ValidateVolumeCapabilitiesRequest) Reset()         { *m = ValidateVolumeCapabilitiesRequest{} }
 func (m *ValidateVolumeCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*ValidateVolumeCapabilitiesRequest) ProtoMessage()    {}
 func (*ValidateVolumeCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{21}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{21}
 }
 func (m *ValidateVolumeCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ValidateVolumeCapabilitiesRequest.Unmarshal(m, b)
@@ -2031,6 +2031,13 @@ func (m *ValidateVolumeCapabilitiesRequest) GetVolumeId() string {
 	return ""
 }
 
+func (m *ValidateVolumeCapabilitiesRequest) GetVolumeAttributes() map[string]string {
+	if m != nil {
+		return m.VolumeAttributes
+	}
+	return nil
+}
+
 func (m *ValidateVolumeCapabilitiesRequest) GetVolumeCapabilities() []*VolumeCapability {
 	if m != nil {
 		return m.VolumeCapabilities
@@ -2038,25 +2045,31 @@ func (m *ValidateVolumeCapabilitiesRequest) GetVolumeCapabilities() []*VolumeCap
 	return nil
 }
 
-func (m *ValidateVolumeCapabilitiesRequest) GetVolumeAttributes() map[string]string {
+func (m *ValidateVolumeCapabilitiesRequest) GetParameters() map[string]string {
 	if m != nil {
-		return m.VolumeAttributes
+		return m.Parameters
 	}
 	return nil
 }
 
-func (m *ValidateVolumeCapabilitiesRequest) GetAccessibleTopology() []*Topology {
+func (m *ValidateVolumeCapabilitiesRequest) GetControllerValidateSecrets() map[string]string {
 	if m != nil {
-		return m.AccessibleTopology
+		return m.ControllerValidateSecrets
 	}
 	return nil
 }
 
 type ValidateVolumeCapabilitiesResponse struct {
-	// True if the Plugin supports the specified capabilities for the
-	// given volume. This field is REQUIRED.
-	Supported bool `protobuf:"varint,1,opt,name=supported,proto3" json:"supported,omitempty"`
-	// Message to the CO if `supported` above is false. This field is
+	// Confirmed indicates to the CO the set of capabilities that the
+	// plugin has validated. This field SHALL only be set to a non-empty
+	// value for successful validation responses.
+	// For successful validation responses, the CO SHALL compare the
+	// fields of this message to the originally requested capabilities in
+	// order to guard against an older plugin reporting "valid" for newer
+	// capability fields that it does not yet understand.
+	// This field is OPTIONAL.
+	Confirmed *ValidateVolumeCapabilitiesResponse_Confirmed `protobuf:"bytes,1,opt,name=confirmed,proto3" json:"confirmed,omitempty"`
+	// Message to the CO if `confirmed` above is empty. This field is
 	// OPTIONAL.
 	// An empty string is equal to an unspecified field value.
 	Message              string   `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
@@ -2069,7 +2082,7 @@ func (m *ValidateVolumeCapabilitiesResponse) Reset()         { *m = ValidateVolu
 func (m *ValidateVolumeCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*ValidateVolumeCapabilitiesResponse) ProtoMessage()    {}
 func (*ValidateVolumeCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{22}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{22}
 }
 func (m *ValidateVolumeCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ValidateVolumeCapabilitiesResponse.Unmarshal(m, b)
@@ -2089,11 +2102,11 @@ func (m *ValidateVolumeCapabilitiesResponse) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_ValidateVolumeCapabilitiesResponse proto.InternalMessageInfo
 
-func (m *ValidateVolumeCapabilitiesResponse) GetSupported() bool {
+func (m *ValidateVolumeCapabilitiesResponse) GetConfirmed() *ValidateVolumeCapabilitiesResponse_Confirmed {
 	if m != nil {
-		return m.Supported
+		return m.Confirmed
 	}
-	return false
+	return nil
 }
 
 func (m *ValidateVolumeCapabilitiesResponse) GetMessage() string {
@@ -2103,6 +2116,70 @@ func (m *ValidateVolumeCapabilitiesResponse) GetMessage() string {
 	return ""
 }
 
+type ValidateVolumeCapabilitiesResponse_Confirmed struct {
+	// Volume attributes validated by the plugin.
+	// This field is OPTIONAL.
+	VolumeAttributes map[string]string `protobuf:"bytes,1,rep,name=volume_attributes,json=volumeAttributes,proto3" json:"volume_attributes,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// Volume capabilities supported by the plugin.
+	// This field is REQUIRED.
+	VolumeCapabilities []*VolumeCapability `protobuf:"bytes,2,rep,name=volume_capabilities,json=volumeCapabilities,proto3" json:"volume_capabilities,omitempty"`
+	// The volume creation parameters validated by the plugin.
+	// This field is OPTIONAL.
+	Parameters           map[string]string `protobuf:"bytes,3,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *ValidateVolumeCapabilitiesResponse_Confirmed) Reset() {
+	*m = ValidateVolumeCapabilitiesResponse_Confirmed{}
+}
+func (m *ValidateVolumeCapabilitiesResponse_Confirmed) String() string {
+	return proto.CompactTextString(m)
+}
+func (*ValidateVolumeCapabilitiesResponse_Confirmed) ProtoMessage() {}
+func (*ValidateVolumeCapabilitiesResponse_Confirmed) Descriptor() ([]byte, []int) {
+	return fileDescriptor_csi_c4bd447930c2da75, []int{22, 0}
+}
+func (m *ValidateVolumeCapabilitiesResponse_Confirmed) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ValidateVolumeCapabilitiesResponse_Confirmed.Unmarshal(m, b)
+}
+func (m *ValidateVolumeCapabilitiesResponse_Confirmed) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ValidateVolumeCapabilitiesResponse_Confirmed.Marshal(b, m, deterministic)
+}
+func (dst *ValidateVolumeCapabilitiesResponse_Confirmed) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ValidateVolumeCapabilitiesResponse_Confirmed.Merge(dst, src)
+}
+func (m *ValidateVolumeCapabilitiesResponse_Confirmed) XXX_Size() int {
+	return xxx_messageInfo_ValidateVolumeCapabilitiesResponse_Confirmed.Size(m)
+}
+func (m *ValidateVolumeCapabilitiesResponse_Confirmed) XXX_DiscardUnknown() {
+	xxx_messageInfo_ValidateVolumeCapabilitiesResponse_Confirmed.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ValidateVolumeCapabilitiesResponse_Confirmed proto.InternalMessageInfo
+
+func (m *ValidateVolumeCapabilitiesResponse_Confirmed) GetVolumeAttributes() map[string]string {
+	if m != nil {
+		return m.VolumeAttributes
+	}
+	return nil
+}
+
+func (m *ValidateVolumeCapabilitiesResponse_Confirmed) GetVolumeCapabilities() []*VolumeCapability {
+	if m != nil {
+		return m.VolumeCapabilities
+	}
+	return nil
+}
+
+func (m *ValidateVolumeCapabilitiesResponse_Confirmed) GetParameters() map[string]string {
+	if m != nil {
+		return m.Parameters
+	}
+	return nil
+}
+
 type ListVolumesRequest struct {
 	// If specified (non-zero value), the Plugin MUST NOT return more
 	// entries than this number in the response. If the actual number of
@@ -2127,7 +2204,7 @@ func (m *ListVolumesRequest) Reset()         { *m = ListVolumesRequest{} }
 func (m *ListVolumesRequest) String() string { return proto.CompactTextString(m) }
 func (*ListVolumesRequest) ProtoMessage()    {}
 func (*ListVolumesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{23}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{23}
 }
 func (m *ListVolumesRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListVolumesRequest.Unmarshal(m, b)
@@ -2179,7 +2256,7 @@ func (m *ListVolumesResponse) Reset()         { *m = ListVolumesResponse{} }
 func (m *ListVolumesResponse) String() string { return proto.CompactTextString(m) }
 func (*ListVolumesResponse) ProtoMessage()    {}
 func (*ListVolumesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{24}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{24}
 }
 func (m *ListVolumesResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListVolumesResponse.Unmarshal(m, b)
@@ -2224,7 +2301,7 @@ func (m *ListVolumesResponse_Entry) Reset()         { *m = ListVolumesResponse_E
 func (m *ListVolumesResponse_Entry) String() string { return proto.CompactTextString(m) }
 func (*ListVolumesResponse_Entry) ProtoMessage()    {}
 func (*ListVolumesResponse_Entry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{24, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{24, 0}
 }
 func (m *ListVolumesResponse_Entry) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListVolumesResponse_Entry.Unmarshal(m, b)
@@ -2279,7 +2356,7 @@ func (m *GetCapacityRequest) Reset()         { *m = GetCapacityRequest{} }
 func (m *GetCapacityRequest) String() string { return proto.CompactTextString(m) }
 func (*GetCapacityRequest) ProtoMessage()    {}
 func (*GetCapacityRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{25}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{25}
 }
 func (m *GetCapacityRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetCapacityRequest.Unmarshal(m, b)
@@ -2337,7 +2414,7 @@ func (m *GetCapacityResponse) Reset()         { *m = GetCapacityResponse{} }
 func (m *GetCapacityResponse) String() string { return proto.CompactTextString(m) }
 func (*GetCapacityResponse) ProtoMessage()    {}
 func (*GetCapacityResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{26}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{26}
 }
 func (m *GetCapacityResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetCapacityResponse.Unmarshal(m, b)
@@ -2374,7 +2451,7 @@ func (m *ControllerGetCapabilitiesRequest) Reset()         { *m = ControllerGetC
 func (m *ControllerGetCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*ControllerGetCapabilitiesRequest) ProtoMessage()    {}
 func (*ControllerGetCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{27}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{27}
 }
 func (m *ControllerGetCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerGetCapabilitiesRequest.Unmarshal(m, b)
@@ -2407,7 +2484,7 @@ func (m *ControllerGetCapabilitiesResponse) Reset()         { *m = ControllerGet
 func (m *ControllerGetCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*ControllerGetCapabilitiesResponse) ProtoMessage()    {}
 func (*ControllerGetCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{28}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{28}
 }
 func (m *ControllerGetCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerGetCapabilitiesResponse.Unmarshal(m, b)
@@ -2448,7 +2525,7 @@ func (m *ControllerServiceCapability) Reset()         { *m = ControllerServiceCa
 func (m *ControllerServiceCapability) String() string { return proto.CompactTextString(m) }
 func (*ControllerServiceCapability) ProtoMessage()    {}
 func (*ControllerServiceCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{29}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{29}
 }
 func (m *ControllerServiceCapability) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerServiceCapability.Unmarshal(m, b)
@@ -2558,7 +2635,7 @@ func (m *ControllerServiceCapability_RPC) Reset()         { *m = ControllerServi
 func (m *ControllerServiceCapability_RPC) String() string { return proto.CompactTextString(m) }
 func (*ControllerServiceCapability_RPC) ProtoMessage()    {}
 func (*ControllerServiceCapability_RPC) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{29, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{29, 0}
 }
 func (m *ControllerServiceCapability_RPC) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerServiceCapability_RPC.Unmarshal(m, b)
@@ -2616,7 +2693,7 @@ func (m *CreateSnapshotRequest) Reset()         { *m = CreateSnapshotRequest{} }
 func (m *CreateSnapshotRequest) String() string { return proto.CompactTextString(m) }
 func (*CreateSnapshotRequest) ProtoMessage()    {}
 func (*CreateSnapshotRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{30}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{30}
 }
 func (m *CreateSnapshotRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CreateSnapshotRequest.Unmarshal(m, b)
@@ -2678,7 +2755,7 @@ func (m *CreateSnapshotResponse) Reset()         { *m = CreateSnapshotResponse{}
 func (m *CreateSnapshotResponse) String() string { return proto.CompactTextString(m) }
 func (*CreateSnapshotResponse) ProtoMessage()    {}
 func (*CreateSnapshotResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{31}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{31}
 }
 func (m *CreateSnapshotResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CreateSnapshotResponse.Unmarshal(m, b)
@@ -2741,7 +2818,7 @@ func (m *Snapshot) Reset()         { *m = Snapshot{} }
 func (m *Snapshot) String() string { return proto.CompactTextString(m) }
 func (*Snapshot) ProtoMessage()    {}
 func (*Snapshot) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{32}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{32}
 }
 func (m *Snapshot) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Snapshot.Unmarshal(m, b)
@@ -2812,7 +2889,7 @@ func (m *SnapshotStatus) Reset()         { *m = SnapshotStatus{} }
 func (m *SnapshotStatus) String() string { return proto.CompactTextString(m) }
 func (*SnapshotStatus) ProtoMessage()    {}
 func (*SnapshotStatus) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{33}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{33}
 }
 func (m *SnapshotStatus) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SnapshotStatus.Unmarshal(m, b)
@@ -2863,7 +2940,7 @@ func (m *DeleteSnapshotRequest) Reset()         { *m = DeleteSnapshotRequest{} }
 func (m *DeleteSnapshotRequest) String() string { return proto.CompactTextString(m) }
 func (*DeleteSnapshotRequest) ProtoMessage()    {}
 func (*DeleteSnapshotRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{34}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{34}
 }
 func (m *DeleteSnapshotRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DeleteSnapshotRequest.Unmarshal(m, b)
@@ -2907,7 +2984,7 @@ func (m *DeleteSnapshotResponse) Reset()         { *m = DeleteSnapshotResponse{}
 func (m *DeleteSnapshotResponse) String() string { return proto.CompactTextString(m) }
 func (*DeleteSnapshotResponse) ProtoMessage()    {}
 func (*DeleteSnapshotResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{35}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{35}
 }
 func (m *DeleteSnapshotResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DeleteSnapshotResponse.Unmarshal(m, b)
@@ -2961,7 +3038,7 @@ func (m *ListSnapshotsRequest) Reset()         { *m = ListSnapshotsRequest{} }
 func (m *ListSnapshotsRequest) String() string { return proto.CompactTextString(m) }
 func (*ListSnapshotsRequest) ProtoMessage()    {}
 func (*ListSnapshotsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{36}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{36}
 }
 func (m *ListSnapshotsRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListSnapshotsRequest.Unmarshal(m, b)
@@ -3027,7 +3104,7 @@ func (m *ListSnapshotsResponse) Reset()         { *m = ListSnapshotsResponse{} }
 func (m *ListSnapshotsResponse) String() string { return proto.CompactTextString(m) }
 func (*ListSnapshotsResponse) ProtoMessage()    {}
 func (*ListSnapshotsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{37}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{37}
 }
 func (m *ListSnapshotsResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListSnapshotsResponse.Unmarshal(m, b)
@@ -3072,7 +3149,7 @@ func (m *ListSnapshotsResponse_Entry) Reset()         { *m = ListSnapshotsRespon
 func (m *ListSnapshotsResponse_Entry) String() string { return proto.CompactTextString(m) }
 func (*ListSnapshotsResponse_Entry) ProtoMessage()    {}
 func (*ListSnapshotsResponse_Entry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{37, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{37, 0}
 }
 func (m *ListSnapshotsResponse_Entry) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListSnapshotsResponse_Entry.Unmarshal(m, b)
@@ -3134,7 +3211,7 @@ func (m *NodeStageVolumeRequest) Reset()         { *m = NodeStageVolumeRequest{}
 func (m *NodeStageVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeStageVolumeRequest) ProtoMessage()    {}
 func (*NodeStageVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{38}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{38}
 }
 func (m *NodeStageVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeStageVolumeRequest.Unmarshal(m, b)
@@ -3206,7 +3283,7 @@ func (m *NodeStageVolumeResponse) Reset()         { *m = NodeStageVolumeResponse
 func (m *NodeStageVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeStageVolumeResponse) ProtoMessage()    {}
 func (*NodeStageVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{39}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{39}
 }
 func (m *NodeStageVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeStageVolumeResponse.Unmarshal(m, b)
@@ -3242,7 +3319,7 @@ func (m *NodeUnstageVolumeRequest) Reset()         { *m = NodeUnstageVolumeReque
 func (m *NodeUnstageVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeUnstageVolumeRequest) ProtoMessage()    {}
 func (*NodeUnstageVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{40}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{40}
 }
 func (m *NodeUnstageVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeUnstageVolumeRequest.Unmarshal(m, b)
@@ -3286,7 +3363,7 @@ func (m *NodeUnstageVolumeResponse) Reset()         { *m = NodeUnstageVolumeResp
 func (m *NodeUnstageVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeUnstageVolumeResponse) ProtoMessage()    {}
 func (*NodeUnstageVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{41}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{41}
 }
 func (m *NodeUnstageVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeUnstageVolumeResponse.Unmarshal(m, b)
@@ -3352,7 +3429,7 @@ func (m *NodePublishVolumeRequest) Reset()         { *m = NodePublishVolumeReque
 func (m *NodePublishVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodePublishVolumeRequest) ProtoMessage()    {}
 func (*NodePublishVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{42}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{42}
 }
 func (m *NodePublishVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodePublishVolumeRequest.Unmarshal(m, b)
@@ -3438,7 +3515,7 @@ func (m *NodePublishVolumeResponse) Reset()         { *m = NodePublishVolumeResp
 func (m *NodePublishVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodePublishVolumeResponse) ProtoMessage()    {}
 func (*NodePublishVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{43}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{43}
 }
 func (m *NodePublishVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodePublishVolumeResponse.Unmarshal(m, b)
@@ -3474,7 +3551,7 @@ func (m *NodeUnpublishVolumeRequest) Reset()         { *m = NodeUnpublishVolumeR
 func (m *NodeUnpublishVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeUnpublishVolumeRequest) ProtoMessage()    {}
 func (*NodeUnpublishVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{44}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{44}
 }
 func (m *NodeUnpublishVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeUnpublishVolumeRequest.Unmarshal(m, b)
@@ -3518,7 +3595,7 @@ func (m *NodeUnpublishVolumeResponse) Reset()         { *m = NodeUnpublishVolume
 func (m *NodeUnpublishVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeUnpublishVolumeResponse) ProtoMessage()    {}
 func (*NodeUnpublishVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{45}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{45}
 }
 func (m *NodeUnpublishVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeUnpublishVolumeResponse.Unmarshal(m, b)
@@ -3556,7 +3633,7 @@ func (m *NodeGetVolumeStatsRequest) Reset()         { *m = NodeGetVolumeStatsReq
 func (m *NodeGetVolumeStatsRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetVolumeStatsRequest) ProtoMessage()    {}
 func (*NodeGetVolumeStatsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{46}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{46}
 }
 func (m *NodeGetVolumeStatsRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetVolumeStatsRequest.Unmarshal(m, b)
@@ -3602,7 +3679,7 @@ func (m *NodeGetVolumeStatsResponse) Reset()         { *m = NodeGetVolumeStatsRe
 func (m *NodeGetVolumeStatsResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetVolumeStatsResponse) ProtoMessage()    {}
 func (*NodeGetVolumeStatsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{47}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{47}
 }
 func (m *NodeGetVolumeStatsResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetVolumeStatsResponse.Unmarshal(m, b)
@@ -3650,7 +3727,7 @@ func (m *VolumeUsage) Reset()         { *m = VolumeUsage{} }
 func (m *VolumeUsage) String() string { return proto.CompactTextString(m) }
 func (*VolumeUsage) ProtoMessage()    {}
 func (*VolumeUsage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{48}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{48}
 }
 func (m *VolumeUsage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeUsage.Unmarshal(m, b)
@@ -3708,7 +3785,7 @@ func (m *NodeGetIdRequest) Reset()         { *m = NodeGetIdRequest{} }
 func (m *NodeGetIdRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetIdRequest) ProtoMessage()    {}
 func (*NodeGetIdRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{49}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{49}
 }
 func (m *NodeGetIdRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetIdRequest.Unmarshal(m, b)
@@ -3742,7 +3819,7 @@ func (m *NodeGetIdResponse) Reset()         { *m = NodeGetIdResponse{} }
 func (m *NodeGetIdResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetIdResponse) ProtoMessage()    {}
 func (*NodeGetIdResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{50}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{50}
 }
 func (m *NodeGetIdResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetIdResponse.Unmarshal(m, b)
@@ -3779,7 +3856,7 @@ func (m *NodeGetCapabilitiesRequest) Reset()         { *m = NodeGetCapabilitiesR
 func (m *NodeGetCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetCapabilitiesRequest) ProtoMessage()    {}
 func (*NodeGetCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{51}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{51}
 }
 func (m *NodeGetCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetCapabilitiesRequest.Unmarshal(m, b)
@@ -3812,7 +3889,7 @@ func (m *NodeGetCapabilitiesResponse) Reset()         { *m = NodeGetCapabilities
 func (m *NodeGetCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetCapabilitiesResponse) ProtoMessage()    {}
 func (*NodeGetCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{52}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{52}
 }
 func (m *NodeGetCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetCapabilitiesResponse.Unmarshal(m, b)
@@ -3853,7 +3930,7 @@ func (m *NodeServiceCapability) Reset()         { *m = NodeServiceCapability{} }
 func (m *NodeServiceCapability) String() string { return proto.CompactTextString(m) }
 func (*NodeServiceCapability) ProtoMessage()    {}
 func (*NodeServiceCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{53}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{53}
 }
 func (m *NodeServiceCapability) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeServiceCapability.Unmarshal(m, b)
@@ -3963,7 +4040,7 @@ func (m *NodeServiceCapability_RPC) Reset()         { *m = NodeServiceCapability
 func (m *NodeServiceCapability_RPC) String() string { return proto.CompactTextString(m) }
 func (*NodeServiceCapability_RPC) ProtoMessage()    {}
 func (*NodeServiceCapability_RPC) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{53, 0}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{53, 0}
 }
 func (m *NodeServiceCapability_RPC) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeServiceCapability_RPC.Unmarshal(m, b)
@@ -4000,7 +4077,7 @@ func (m *NodeGetInfoRequest) Reset()         { *m = NodeGetInfoRequest{} }
 func (m *NodeGetInfoRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetInfoRequest) ProtoMessage()    {}
 func (*NodeGetInfoRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{54}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{54}
 }
 func (m *NodeGetInfoRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetInfoRequest.Unmarshal(m, b)
@@ -4058,7 +4135,7 @@ func (m *NodeGetInfoResponse) Reset()         { *m = NodeGetInfoResponse{} }
 func (m *NodeGetInfoResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetInfoResponse) ProtoMessage()    {}
 func (*NodeGetInfoResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_68cc61910dffa6c4, []int{55}
+	return fileDescriptor_csi_c4bd447930c2da75, []int{55}
 }
 func (m *NodeGetInfoResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetInfoResponse.Unmarshal(m, b)
@@ -4137,8 +4214,13 @@ func init() {
 	proto.RegisterMapType((map[string]string)(nil), "csi.v0.ControllerUnpublishVolumeRequest.ControllerUnpublishSecretsEntry")
 	proto.RegisterType((*ControllerUnpublishVolumeResponse)(nil), "csi.v0.ControllerUnpublishVolumeResponse")
 	proto.RegisterType((*ValidateVolumeCapabilitiesRequest)(nil), "csi.v0.ValidateVolumeCapabilitiesRequest")
+	proto.RegisterMapType((map[string]string)(nil), "csi.v0.ValidateVolumeCapabilitiesRequest.ControllerValidateSecretsEntry")
+	proto.RegisterMapType((map[string]string)(nil), "csi.v0.ValidateVolumeCapabilitiesRequest.ParametersEntry")
 	proto.RegisterMapType((map[string]string)(nil), "csi.v0.ValidateVolumeCapabilitiesRequest.VolumeAttributesEntry")
 	proto.RegisterType((*ValidateVolumeCapabilitiesResponse)(nil), "csi.v0.ValidateVolumeCapabilitiesResponse")
+	proto.RegisterType((*ValidateVolumeCapabilitiesResponse_Confirmed)(nil), "csi.v0.ValidateVolumeCapabilitiesResponse.Confirmed")
+	proto.RegisterMapType((map[string]string)(nil), "csi.v0.ValidateVolumeCapabilitiesResponse.Confirmed.ParametersEntry")
+	proto.RegisterMapType((map[string]string)(nil), "csi.v0.ValidateVolumeCapabilitiesResponse.Confirmed.VolumeAttributesEntry")
 	proto.RegisterType((*ListVolumesRequest)(nil), "csi.v0.ListVolumesRequest")
 	proto.RegisterType((*ListVolumesResponse)(nil), "csi.v0.ListVolumesResponse")
 	proto.RegisterType((*ListVolumesResponse_Entry)(nil), "csi.v0.ListVolumesResponse.Entry")
@@ -5035,205 +5117,210 @@ var _Node_serviceDesc = grpc.ServiceDesc{
 }
 
 func init() {
-	proto.RegisterFile("github.com/container-storage-interface/spec/csi.proto", fileDescriptor_csi_68cc61910dffa6c4)
-}
-
-var fileDescriptor_csi_68cc61910dffa6c4 = []byte{
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+	proto.RegisterFile("github.com/container-storage-interface/spec/csi.proto", fileDescriptor_csi_c4bd447930c2da75)
+}
+
+var fileDescriptor_csi_c4bd447930c2da75 = []byte{
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+	0x33, 0x9e, 0xd0, 0x29, 0xdc, 0x01, 0x76, 0x7c, 0xc6, 0xcf, 0x60, 0xee, 0xb4, 0xf1, 0x5f, 0x09,
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+	0x73, 0x19, 0x6c, 0x50, 0x5e, 0x1d, 0xf8, 0x45, 0xa6, 0x32, 0x86, 0x4e, 0x63, 0x1f, 0x86, 0x32,
+	0xc3, 0xb7, 0xe7, 0xfb, 0x56, 0x0a, 0x5c, 0x53, 0xbe, 0x75, 0x09, 0x55, 0x24, 0xe7, 0x35, 0xc8,
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+	0x6d, 0xfc, 0x6f, 0x02, 0xa0, 0x37, 0xe5, 0x41, 0x0f, 0xe1, 0x4a, 0xfc, 0x8b, 0x27, 0xb4, 0x3c,
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+	0x17, 0x86, 0x7b, 0x61, 0x2c, 0xbf, 0x38, 0xe4, 0xcb, 0x53, 0x65, 0x0c, 0x39, 0xb0, 0x94, 0xf8,
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+	0x33, 0x7c, 0xf4, 0xd2, 0xd0, 0x6f, 0xa6, 0xe4, 0x3b, 0xc3, 0xbf, 0x12, 0x50, 0xc6, 0xd0, 0x0e,
+	0x4c, 0xc5, 0xa6, 0xdb, 0x48, 0x16, 0x8e, 0xbc, 0x09, 0xe3, 0xe5, 0x01, 0xe3, 0x70, 0xc2, 0x29,
+	0x36, 0x81, 0xed, 0x71, 0xea, 0x1f, 0x25, 0xf7, 0x38, 0x09, 0x46, 0xb6, 0xbc, 0xf9, 0xb9, 0xbc,
+	0x2c, 0x32, 0xbf, 0x38, 0xb1, 0x8b, 0xcc, 0x9f, 0x90, 0xe4, 0x95, 0x31, 0xf4, 0x7d, 0x98, 0x61,
+	0x87, 0x4e, 0x68, 0x75, 0xe0, 0x28, 0x4d, 0xbe, 0x96, 0x84, 0x8e, 0xb3, 0x64, 0x27, 0x06, 0x3d,
+	0x96, 0xc2, 0xf1, 0x46, 0x8f, 0x65, 0xc2, 0xa0, 0x61, 0xcc, 0xcf, 0x4f, 0x4c, 0x37, 0xde, 0xcb,
+	0x4f, 0xa2, 0x01, 0x44, 0x2f, 0x3f, 0x09, 0x5b, 0x78, 0x65, 0x6c, 0xe3, 0x6f, 0x59, 0xc8, 0x04,
+	0x89, 0xb4, 0x0e, 0xcf, 0x71, 0x4d, 0x0d, 0xba, 0x36, 0xb8, 0xf3, 0x93, 0xaf, 0x27, 0xe2, 0x23,
+	0x75, 0x1f, 0x91, 0x6b, 0x9a, 0x69, 0x53, 0xd0, 0x5a, 0x7c, 0x9d, 0xa8, 0x55, 0x92, 0x6f, 0x0c,
+	0xa0, 0xe0, 0x79, 0xb3, 0xb9, 0x60, 0xed, 0xb2, 0x7a, 0x99, 0xe5, 0x9d, 0x14, 0xff, 0x1f, 0x90,
+	0x7b, 0x8b, 0x8f, 0x7c, 0x85, 0xd5, 0x4b, 0x18, 0xf3, 0x37, 0x07, 0xd2, 0x44, 0x12, 0xde, 0x8f,
+	0x2e, 0xcc, 0x58, 0x3d, 0x87, 0x18, 0xe5, 0x84, 0x65, 0xa4, 0xac, 0x0c, 0x22, 0x89, 0xd8, 0xab,
+	0x90, 0x8b, 0xea, 0x23, 0x54, 0xe0, 0x96, 0x44, 0x65, 0x94, 0xbc, 0x24, 0xc0, 0x50, 0x1e, 0xe9,
+	0x4f, 0x52, 0x52, 0x68, 0x07, 0x3e, 0x04, 0x79, 0x1d, 0x44, 0xc1, 0x77, 0x73, 0x20, 0x4d, 0x3c,
+	0x69, 0xc4, 0x2a, 0x84, 0x5e, 0xd2, 0xe8, 0xaf, 0x26, 0x7a, 0x49, 0x43, 0x50, 0x52, 0x28, 0x63,
+	0x9b, 0xd9, 0x47, 0xe9, 0x86, 0x6b, 0x9e, 0x8c, 0x07, 0xdf, 0xc2, 0x7f, 0xe7, 0xff, 0x01, 0x00,
+	0x00, 0xff, 0xff, 0x3c, 0x81, 0x38, 0xe8, 0x0b, 0x32, 0x00, 0x00,
 }
diff --git a/spec.md b/spec.md
index 7694ebba..af90477e 100644
--- a/spec.md
+++ b/spec.md
@@ -1175,38 +1175,62 @@ The CO MUST implement the specified error recovery behavior when it encounters t
 
 A Controller Plugin MUST implement this RPC call.
 This RPC will be called by the CO to check if a pre-provisioned volume has all the capabilities that the CO wants.
-This RPC call SHALL return `supported` only if all the volume capabilities specified in the request are supported.
+This RPC call SHALL return `confirmed` only if all the volume capabilities specified in the request are supported (see caveat below).
 This operation MUST be idempotent.
 
+NOTE: Older plugins will parse but likely not "process" newer fields that may be present in capability-validation messages (and sub-messages) sent by a CO that is communicating using a newer, backwards-compatible version of the CSI protobufs.
+Therefore, the CO SHALL reconcile successful capability-validation responses by comparing the validated capabilities with those that it had originally requested.
+
 ```protobuf
 message ValidateVolumeCapabilitiesRequest {
   // The ID of the volume to check. This field is REQUIRED.
   string volume_id = 1;
 
+  // Attributes of the volume to check. This field is OPTIONAL and MUST
+  // match the attributes of the Volume identified by `volume_id`.
+  map<string, string> volume_attributes = 2;
+
   // The capabilities that the CO wants to check for the volume. This
-  // call SHALL return "supported" only if all the volume capabilities
+  // call SHALL return "confirmed" only if all the volume capabilities
   // specified below are supported. This field is REQUIRED.
-  repeated VolumeCapability volume_capabilities = 2;
+  repeated VolumeCapability volume_capabilities = 3;
 
-  // Attributes of the volume to check. This field is OPTIONAL and MUST
-  // match the attributes of the Volume identified by `volume_id`.
-  map<string, string> volume_attributes = 3;
+  // See CreateVolumeRequest.parameters.
+  // This field is OPTIONAL.
+  map<string, string> parameters = 4;
 
-  // Specifies where (regions, zones, racks, etc.) the caller believes
-  // the volume is accessible from.
-  // A caller MAY specify multiple topologies to indicate they believe
-  // the volume to be accessible from multiple locations.
-  // This field is OPTIONAL. This field SHALL NOT be set unless the
-  // plugin advertises the ACCESSIBILITY_CONSTRAINTS capability.
-  repeated Topology accessible_topology = 4;
+  // Secrets required by plugin to complete volume validation request.
+  // This field is OPTIONAL. Refer to the `Secrets Requirements`
+  // section on how to use this field.
+  map<string, string> controller_validate_secrets = 5;
 }
 
 message ValidateVolumeCapabilitiesResponse {
-  // True if the Plugin supports the specified capabilities for the
-  // given volume. This field is REQUIRED.
-  bool supported = 1;
+  message Confirmed {
+    // Volume attributes validated by the plugin.
+    // This field is OPTIONAL.
+    map<string, string> volume_attributes = 1;
+
+    // Volume capabilities supported by the plugin.
+    // This field is REQUIRED.
+    repeated VolumeCapability volume_capabilities = 2;
+
+    // The volume creation parameters validated by the plugin.
+    // This field is OPTIONAL.
+    map<string, string> parameters = 3;
+  }
+
+  // Confirmed indicates to the CO the set of capabilities that the
+  // plugin has validated. This field SHALL only be set to a non-empty
+  // value for successful validation responses.
+  // For successful validation responses, the CO SHALL compare the
+  // fields of this message to the originally requested capabilities in
+  // order to guard against an older plugin reporting "valid" for newer
+  // capability fields that it does not yet understand.
+  // This field is OPTIONAL.
+  Confirmed confirmed = 1;
 
-  // Message to the CO if `supported` above is false. This field is
+  // Message to the CO if `confirmed` above is empty. This field is
   // OPTIONAL.
   // An empty string is equal to an unspecified field value.
   string message = 2;