factory: Make factory status can show status of VMCache server

This commit adds a new gRPC function Status to CacheService.  VMCache
server will reply the status of VMCache server.
Factory destroy will call gRPC Status to get the status of VMCache
server and output it when VMCache is enabled.

Fixes: #1395

Signed-off-by: Hui Zhu <teawater@hyper.sh>

cli/factory.go

@@ -91,6 +91,14 @@ func (s *cacheServer) Quit(ctx context.Context, empty *types.Empty) (*types.Empt
 	return nil, nil
 }
 
+func (s *cacheServer) Status(ctx context.Context, empty *types.Empty) (*pb.GrpcStatus, error) {
+	stat := pb.GrpcStatus{
+		Pid:      int64(os.Getpid()),
+		Vmstatus: s.factory.GetVMStatus(),
+	}
+	return &stat, nil
+}
+
 func getUnixListener(path string) (net.Listener, error) {
 	err := os.MkdirAll(filepath.Dir(path), 0755)
 	if err != nil {
@@ -286,6 +294,23 @@ var statusFactoryCommand = cli.Command{
 			return errors.New("invalid runtime config")
 		}
 
+		if runtimeConfig.FactoryConfig.VMCacheNumber > 0 {
+			conn, err := grpc.Dial(fmt.Sprintf("unix://%s", runtimeConfig.FactoryConfig.VMCacheEndpoint), grpc.WithInsecure())
+			if err != nil {
+				fmt.Fprintln(defaultOutputFile, errors.Wrapf(err, "failed to connect %q", runtimeConfig.FactoryConfig.VMCacheEndpoint))
+			} else {
+				defer conn.Close()
+				status, err := pb.NewCacheServiceClient(conn).Status(ctx, &types.Empty{})
+				if err != nil {
+					fmt.Fprintln(defaultOutputFile, errors.Wrapf(err, "failed to call gRPC Status\n"))
+				} else {
+					fmt.Fprintf(defaultOutputFile, "VM cache server pid = %d\n", status.Pid)
+					for _, vs := range status.Vmstatus {
+						fmt.Fprintf(defaultOutputFile, "VM pid = %d Cpu = %d Memory = %dMiB\n", vs.Pid, vs.Cpu, vs.Memory)
+					}
+				}
+			}
+		}
 		if runtimeConfig.FactoryConfig.Template {
 			factoryConfig := vf.Config{
 				Template: true,

protocols/cache/cache.pb.go

@@ -10,6 +10,8 @@
 	It has these top-level messages:
 		GrpcVMConfig
 		GrpcVM
+		GrpcStatus
+		GrpcVMStatus
 */
 package cache
 
@@ -124,9 +126,67 @@ func (m *GrpcVM) GetCpuDelta() uint32 {
 	return 0
 }
 
+type GrpcStatus struct {
+	Pid      int64           `protobuf:"varint,1,opt,name=pid,proto3" json:"pid,omitempty"`
+	Vmstatus []*GrpcVMStatus `protobuf:"bytes,2,rep,name=vmstatus" json:"vmstatus,omitempty"`
+}
+
+func (m *GrpcStatus) Reset()                    { *m = GrpcStatus{} }
+func (m *GrpcStatus) String() string            { return proto.CompactTextString(m) }
+func (*GrpcStatus) ProtoMessage()               {}
+func (*GrpcStatus) Descriptor() ([]byte, []int) { return fileDescriptorCache, []int{2} }
+
+func (m *GrpcStatus) GetPid() int64 {
+	if m != nil {
+		return m.Pid
+	}
+	return 0
+}
+
+func (m *GrpcStatus) GetVmstatus() []*GrpcVMStatus {
+	if m != nil {
+		return m.Vmstatus
+	}
+	return nil
+}
+
+type GrpcVMStatus struct {
+	Pid    int64  `protobuf:"varint,1,opt,name=pid,proto3" json:"pid,omitempty"`
+	Cpu    uint32 `protobuf:"varint,2,opt,name=cpu,proto3" json:"cpu,omitempty"`
+	Memory uint32 `protobuf:"varint,3,opt,name=memory,proto3" json:"memory,omitempty"`
+}
+
+func (m *GrpcVMStatus) Reset()                    { *m = GrpcVMStatus{} }
+func (m *GrpcVMStatus) String() string            { return proto.CompactTextString(m) }
+func (*GrpcVMStatus) ProtoMessage()               {}
+func (*GrpcVMStatus) Descriptor() ([]byte, []int) { return fileDescriptorCache, []int{3} }
+
+func (m *GrpcVMStatus) GetPid() int64 {
+	if m != nil {
+		return m.Pid
+	}
+	return 0
+}
+
+func (m *GrpcVMStatus) GetCpu() uint32 {
+	if m != nil {
+		return m.Cpu
+	}
+	return 0
+}
+
+func (m *GrpcVMStatus) GetMemory() uint32 {
+	if m != nil {
+		return m.Memory
+	}
+	return 0
+}
+
 func init() {
 	proto.RegisterType((*GrpcVMConfig)(nil), "cache.GrpcVMConfig")
 	proto.RegisterType((*GrpcVM)(nil), "cache.GrpcVM")
+	proto.RegisterType((*GrpcStatus)(nil), "cache.GrpcStatus")
+	proto.RegisterType((*GrpcVMStatus)(nil), "cache.GrpcVMStatus")
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -142,6 +202,7 @@ const _ = grpc.SupportPackageIsVersion4
 type CacheServiceClient interface {
 	Config(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*GrpcVMConfig, error)
 	GetBaseVM(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*GrpcVM, error)
+	Status(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*GrpcStatus, error)
 	Quit(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
 }
 
@@ -171,6 +232,15 @@ func (c *cacheServiceClient) GetBaseVM(ctx context.Context, in *google_protobuf.
 	return out, nil
 }
 
+func (c *cacheServiceClient) Status(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*GrpcStatus, error) {
+	out := new(GrpcStatus)
+	err := grpc.Invoke(ctx, "/cache.CacheService/Status", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *cacheServiceClient) Quit(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*google_protobuf.Empty, error) {
 	out := new(google_protobuf.Empty)
 	err := grpc.Invoke(ctx, "/cache.CacheService/Quit", in, out, c.cc, opts...)
@@ -185,6 +255,7 @@ func (c *cacheServiceClient) Quit(ctx context.Context, in *google_protobuf.Empty
 type CacheServiceServer interface {
 	Config(context.Context, *google_protobuf.Empty) (*GrpcVMConfig, error)
 	GetBaseVM(context.Context, *google_protobuf.Empty) (*GrpcVM, error)
+	Status(context.Context, *google_protobuf.Empty) (*GrpcStatus, error)
 	Quit(context.Context, *google_protobuf.Empty) (*google_protobuf.Empty, error)
 }
 
@@ -228,6 +299,24 @@ func _CacheService_GetBaseVM_Handler(srv interface{}, ctx context.Context, dec f
 	return interceptor(ctx, in, info, handler)
 }
 
+func _CacheService_Status_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(google_protobuf.Empty)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CacheServiceServer).Status(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/cache.CacheService/Status",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CacheServiceServer).Status(ctx, req.(*google_protobuf.Empty))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _CacheService_Quit_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(google_protobuf.Empty)
 	if err := dec(in); err != nil {
@@ -258,6 +347,10 @@ var _CacheService_serviceDesc = grpc.ServiceDesc{
 			MethodName: "GetBaseVM",
 			Handler:    _CacheService_GetBaseVM_Handler,
 		},
+		{
+			MethodName: "Status",
+			Handler:    _CacheService_Status_Handler,
+		},
 		{
 			MethodName: "Quit",
 			Handler:    _CacheService_Quit_Handler,
@@ -353,6 +446,74 @@ func (m *GrpcVM) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
+func (m *GrpcStatus) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *GrpcStatus) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if m.Pid != 0 {
+		dAtA[i] = 0x8
+		i++
+		i = encodeVarintCache(dAtA, i, uint64(m.Pid))
+	}
+	if len(m.Vmstatus) > 0 {
+		for _, msg := range m.Vmstatus {
+			dAtA[i] = 0x12
+			i++
+			i = encodeVarintCache(dAtA, i, uint64(msg.Size()))
+			n, err := msg.MarshalTo(dAtA[i:])
+			if err != nil {
+				return 0, err
+			}
+			i += n
+		}
+	}
+	return i, nil
+}
+
+func (m *GrpcVMStatus) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *GrpcVMStatus) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if m.Pid != 0 {
+		dAtA[i] = 0x8
+		i++
+		i = encodeVarintCache(dAtA, i, uint64(m.Pid))
+	}
+	if m.Cpu != 0 {
+		dAtA[i] = 0x10
+		i++
+		i = encodeVarintCache(dAtA, i, uint64(m.Cpu))
+	}
+	if m.Memory != 0 {
+		dAtA[i] = 0x18
+		i++
+		i = encodeVarintCache(dAtA, i, uint64(m.Memory))
+	}
+	return i, nil
+}
+
 func encodeVarintCache(dAtA []byte, offset int, v uint64) int {
 	for v >= 1<<7 {
 		dAtA[offset] = uint8(v&0x7f | 0x80)
@@ -406,6 +567,36 @@ func (m *GrpcVM) Size() (n int) {
 	return n
 }
 
+func (m *GrpcStatus) Size() (n int) {
+	var l int
+	_ = l
+	if m.Pid != 0 {
+		n += 1 + sovCache(uint64(m.Pid))
+	}
+	if len(m.Vmstatus) > 0 {
+		for _, e := range m.Vmstatus {
+			l = e.Size()
+			n += 1 + l + sovCache(uint64(l))
+		}
+	}
+	return n
+}
+
+func (m *GrpcVMStatus) Size() (n int) {
+	var l int
+	_ = l
+	if m.Pid != 0 {
+		n += 1 + sovCache(uint64(m.Pid))
+	}
+	if m.Cpu != 0 {
+		n += 1 + sovCache(uint64(m.Cpu))
+	}
+	if m.Memory != 0 {
+		n += 1 + sovCache(uint64(m.Memory))
+	}
+	return n
+}
+
 func sovCache(x uint64) (n int) {
 	for {
 		n++
@@ -746,6 +937,213 @@ func (m *GrpcVM) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *GrpcStatus) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowCache
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: GrpcStatus: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: GrpcStatus: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Pid", wireType)
+			}
+			m.Pid = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowCache
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Pid |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Vmstatus", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowCache
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthCache
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Vmstatus = append(m.Vmstatus, &GrpcVMStatus{})
+			if err := m.Vmstatus[len(m.Vmstatus)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipCache(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthCache
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *GrpcVMStatus) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowCache
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: GrpcVMStatus: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: GrpcVMStatus: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Pid", wireType)
+			}
+			m.Pid = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowCache
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Pid |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Cpu", wireType)
+			}
+			m.Cpu = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowCache
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Cpu |= (uint32(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Memory", wireType)
+			}
+			m.Memory = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowCache
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Memory |= (uint32(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipCache(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthCache
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func skipCache(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0
@@ -854,25 +1252,29 @@ var (
 func init() { proto.RegisterFile("cache.proto", fileDescriptorCache) }
 
 var fileDescriptorCache = []byte{
-	// 312 bytes of a gzipped FileDescriptorProto
+	// 374 bytes of a gzipped FileDescriptorProto
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+	0x8f, 0x5f, 0x81, 0x19, 0xf3, 0x92, 0xf4, 0x5d, 0xe4, 0x8f, 0x43, 0x59, 0xe2, 0x09, 0x58, 0x19,
-	0x61, 0x89, 0x50, 0x19, 0xb1, 0x8c, 0x59, 0xa9, 0x62, 0x85, 0xca, 0xd4, 0x67, 0x7b, 0x1d, 0x92,
+	0xcd, 0x58, 0x5e, 0x11, 0x4b, 0x0d, 0x75, 0x27, 0x5d, 0x62, 0x5e, 0xae, 0xe9, 0x45, 0x44, 0xe4,
-	0x7f, 0x26, 0xa9, 0xf5, 0xec, 0x03, 0x81, 0xbd, 0x28, 0x28, 0xbd, 0x14, 0xff, 0xa1, 0x0c, 0xdf,
+	0x85, 0x42, 0x9a, 0xde, 0xfb, 0x02, 0x20, 0x73, 0xef, 0x44, 0x24, 0xca, 0x42, 0x7a, 0x72, 0x1d,
-	0x82, 0x55, 0x91, 0x18, 0x7a, 0x25, 0x37, 0xef, 0x8f, 0x9b, 0xf7, 0x50, 0x70, 0x1b, 0x5d, 0x79,
+	0xde, 0x0c, 0x65, 0x89, 0x67, 0x30, 0xb8, 0x65, 0x85, 0x42, 0x89, 0xe1, 0x9a, 0xfe, 0x68, 0xfe,
-	0x25, 0xe3, 0x33, 0x6c, 0x33, 0xe8, 0x2d, 0x99, 0x9e, 0x87, 0x47, 0xb6, 0x5e, 0x35, 0x36, 0x07,
+	0x26, 0xa8, 0x57, 0x5c, 0x7f, 0xb7, 0x16, 0x86, 0x0d, 0xc9, 0xfb, 0xf4, 0xd8, 0x67, 0xa7, 0xa5,
-	0x67, 0x4d, 0x7c, 0x07, 0x9d, 0xe7, 0x94, 0xeb, 0xc6, 0xf3, 0x06, 0x7f, 0x6e, 0x7f, 0xe5, 0x0e,
+	0x0e, 0x6e, 0xfc, 0x2f, 0xb8, 0xd9, 0x0e, 0x3e, 0xff, 0x8b, 0xc0, 0x5e, 0xc9, 0xc7, 0x76, 0x72,
-	0xfa, 0xce, 0x1d, 0xf4, 0x93, 0x3b, 0x68, 0x63, 0x99, 0xf4, 0xe6, 0x37, 0x00, 0x00, 0xff, 0xff,
+	0x59, 0x31, 0xc5, 0xef, 0xc0, 0xd2, 0x67, 0x9a, 0x04, 0xf5, 0x51, 0x83, 0xc7, 0x51, 0x83, 0x8f,
-	0x2a, 0x60, 0xa2, 0x5e, 0xfa, 0x01, 0x00, 0x00,
+	0xf2, 0xa8, 0xd3, 0xe7, 0x74, 0x9a, 0x3c, 0x87, 0xe1, 0x86, 0x8a, 0x65, 0x54, 0xd0, 0xfd, 0xb6,
+	0x53, 0x39, 0x7e, 0x52, 0xe2, 0x05, 0x58, 0xfa, 0x07, 0x5d, 0x82, 0xd7, 0x2d, 0x81, 0xa6, 0xbe,
+	0x87, 0xde, 0xb7, 0x32, 0x15, 0x9d, 0x92, 0x8e, 0xf9, 0xd2, 0xfe, 0x75, 0x77, 0xd0, 0xef, 0xbb,
+	0x83, 0xfe, 0xdc, 0x1d, 0x74, 0xb0, 0x14, 0xba, 0xf8, 0x17, 0x00, 0x00, 0xff, 0xff, 0x40, 0x5e,
+	0x19, 0x6e, 0xcc, 0x02, 0x00, 0x00,
 }

protocols/cache/cache.proto

@@ -13,6 +13,7 @@ import "google/protobuf/empty.proto";
 service CacheService {
     rpc Config(google.protobuf.Empty) returns (GrpcVMConfig);
     rpc GetBaseVM(google.protobuf.Empty) returns (GrpcVM);
+    rpc Status(google.protobuf.Empty) returns (GrpcStatus);
     rpc Quit(google.protobuf.Empty) returns (google.protobuf.Empty);
 }
 
@@ -34,3 +35,16 @@ message GrpcVM {
 
     uint32 cpuDelta = 7;
 }
+
+message GrpcStatus {
+    int64 pid = 1;
+
+    repeated GrpcVMStatus vmstatus = 2;
+}
+
+message GrpcVMStatus {
+    int64 pid = 1;
+
+    uint32 cpu = 2;
+    uint32 memory = 3;
+}

virtcontainers/factory.go

@@ -5,13 +5,20 @@
 
 package virtcontainers
 
-import "context"
+import (
+	"context"
+
+	pb "github.com/kata-containers/runtime/protocols/cache"
+)
 
 // Factory controls how a new VM is created.
 type Factory interface {
 	// Config returns base factory config.
 	Config() VMConfig
 
+	// GetVMStatus returns the status of the paused VM created by the base factory.
+	GetVMStatus() []*pb.GrpcVMStatus
+
 	// GetVM gets a new VM from the factory.
 	GetVM(ctx context.Context, config VMConfig) (*VM, error)
 

virtcontainers/factory/base/base.go

@@ -8,6 +8,7 @@ package base
 import (
 	"context"
 
+	pb "github.com/kata-containers/runtime/protocols/cache"
 	vc "github.com/kata-containers/runtime/virtcontainers"
 )
 
@@ -20,6 +21,9 @@ type FactoryBase interface {
 	// Config returns base factory config.
 	Config() vc.VMConfig
 
+	// GetVMStatus returns the status of the paused VM created by the base factory.
+	GetVMStatus() []*pb.GrpcVMStatus
+
 	// GetBaseVM returns a paused VM created by the base factory.
 	GetBaseVM(ctx context.Context, config vc.VMConfig) (*vc.VM, error)
 

virtcontainers/factory/cache/cache.go

@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"sync"
 
+	pb "github.com/kata-containers/runtime/protocols/cache"
 	vc "github.com/kata-containers/runtime/virtcontainers"
 	"github.com/kata-containers/runtime/virtcontainers/factory/base"
 )
@@ -22,6 +23,9 @@ type cache struct {
 	closed    chan<- int
 	wg        sync.WaitGroup
 	closeOnce sync.Once
+
+	vmm     map[*vc.VM]interface{}
+	vmmLock sync.RWMutex
 }
 
 // New creates a new cached vm factory.
@@ -32,7 +36,12 @@ func New(ctx context.Context, count uint, b base.FactoryBase) base.FactoryBase {
 
 	cacheCh := make(chan *vc.VM)
 	closed := make(chan int, count)
-	c := cache{base: b, cacheCh: cacheCh, closed: closed}
+	c := cache{
+		base:    b,
+		cacheCh: cacheCh,
+		closed:  closed,
+		vmm:     make(map[*vc.VM]interface{}),
+	}
 	for i := 0; i < int(count); i++ {
 		c.wg.Add(1)
 		go func() {
@@ -43,10 +52,16 @@ func New(ctx context.Context, count uint, b base.FactoryBase) base.FactoryBase {
 					c.CloseFactory(ctx)
 					return
 				}
+				c.addToVmm(vm)
 
 				select {
 				case cacheCh <- vm:
+					// Because vm will not be relased or changed
+					// by cacheServer.GetBaseVM or removeFromVmm.
+					// So removeFromVmm can be called after vm send to cacheCh.
+					c.removeFromVmm(vm)
 				case <-closed:
+					c.removeFromVmm(vm)
 					vm.Stop()
 					c.wg.Done()
 					return
@@ -57,11 +72,39 @@ func New(ctx context.Context, count uint, b base.FactoryBase) base.FactoryBase {
 	return &c
 }
 
+func (c *cache) addToVmm(vm *vc.VM) {
+	c.vmmLock.Lock()
+	defer c.vmmLock.Unlock()
+
+	c.vmm[vm] = nil
+}
+
+func (c *cache) removeFromVmm(vm *vc.VM) {
+	c.vmmLock.Lock()
+	defer c.vmmLock.Unlock()
+
+	delete(c.vmm, vm)
+}
+
 // Config returns cache vm factory's base factory config.
 func (c *cache) Config() vc.VMConfig {
 	return c.base.Config()
 }
 
+// GetVMStatus returns the status of the cached VMs.
+func (c *cache) GetVMStatus() []*pb.GrpcVMStatus {
+	vs := []*pb.GrpcVMStatus{}
+
+	c.vmmLock.RLock()
+	defer c.vmmLock.RUnlock()
+
+	for vm := range c.vmm {
+		vs = append(vs, vm.GetVMStatus())
+	}
+
+	return vs
+}
+
 // GetBaseVM returns a base VM from cache factory's base factory.
 func (c *cache) GetBaseVM(ctx context.Context, config vc.VMConfig) (*vc.VM, error) {
 	vm, ok := <-c.cacheCh

virtcontainers/factory/direct/direct.go

@@ -9,6 +9,7 @@ package direct
 import (
 	"context"
 
+	pb "github.com/kata-containers/runtime/protocols/cache"
 	vc "github.com/kata-containers/runtime/virtcontainers"
 	"github.com/kata-containers/runtime/virtcontainers/factory/base"
 )
@@ -46,3 +47,8 @@ func (d *direct) GetBaseVM(ctx context.Context, config vc.VMConfig) (*vc.VM, err
 // CloseFactory closes the direct vm factory.
 func (d *direct) CloseFactory(ctx context.Context) {
 }
+
+// GetVMStatus is not supported
+func (d *direct) GetVMStatus() []*pb.GrpcVMStatus {
+	panic("ERROR: package direct does not support GetVMStatus")
+}

virtcontainers/factory/factory.go

@@ -9,6 +9,7 @@ import (
 	"context"
 	"fmt"
 
+	pb "github.com/kata-containers/runtime/protocols/cache"
 	vc "github.com/kata-containers/runtime/virtcontainers"
 	"github.com/kata-containers/runtime/virtcontainers/factory/base"
 	"github.com/kata-containers/runtime/virtcontainers/factory/cache"
@@ -234,6 +235,11 @@ func (f *factory) Config() vc.VMConfig {
 	return f.base.Config()
 }
 
+// GetVMStatus returns the status of the paused VM created by the base factory.
+func (f *factory) GetVMStatus() []*pb.GrpcVMStatus {
+	return f.base.GetVMStatus()
+}
+
 // GetBaseVM returns a paused VM created by the base factory.
 func (f *factory) GetBaseVM(ctx context.Context, config vc.VMConfig) (*vc.VM, error) {
 	return f.base.GetBaseVM(ctx, config)

virtcontainers/factory/grpccache/grpccache.go

@@ -9,6 +9,7 @@ package grpccache
 import (
 	"context"
 	"fmt"
+
 	types "github.com/gogo/protobuf/types"
 	pb "github.com/kata-containers/runtime/protocols/cache"
 	vc "github.com/kata-containers/runtime/virtcontainers"
@@ -60,3 +61,8 @@ func (g *grpccache) GetBaseVM(ctx context.Context, config vc.VMConfig) (*vc.VM,
 // CloseFactory closes the direct vm factory.
 func (g *grpccache) CloseFactory(ctx context.Context) {
 }
+
+// GetVMStatus is not supported
+func (g *grpccache) GetVMStatus() []*pb.GrpcVMStatus {
+	panic("ERROR: package grpccache does not support GetVMStatus")
+}

virtcontainers/factory/template/template.go

@@ -13,6 +13,7 @@ import (
 	"syscall"
 	"time"
 
+	pb "github.com/kata-containers/runtime/protocols/cache"
 	vc "github.com/kata-containers/runtime/virtcontainers"
 	"github.com/kata-containers/runtime/virtcontainers/factory/base"
 	"github.com/kata-containers/runtime/virtcontainers/store"
@@ -78,6 +79,11 @@ func (t *template) CloseFactory(ctx context.Context) {
 	t.close()
 }
 
+// GetVMStatus is not supported
+func (t *template) GetVMStatus() []*pb.GrpcVMStatus {
+	panic("ERROR: package template does not support GetVMStatus")
+}
+
 func (t *template) close() {
 	syscall.Unmount(t.statePath, 0)
 	os.RemoveAll(t.statePath)

virtcontainers/vm.go

@@ -484,3 +484,11 @@ func (v *VM) ToGrpc(config VMConfig) (*pb.GrpcVM, error) {
 		CpuDelta: v.cpuDelta,
 	}, nil
 }
+
+func (v *VM) GetVMStatus() *pb.GrpcVMStatus {
+	return &pb.GrpcVMStatus{
+		Pid:    int64(v.hypervisor.pid()),
+		Cpu:    v.cpu,
+		Memory: v.memory,
+	}
+}