cargo: Clean up serde dependencies

There is no need to include serde_derive separately,
as it can be specified as serde feature instead.

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

vmm/src/api/mod.rs

@@ -41,6 +41,7 @@ use crate::config::{
 use crate::device_tree::DeviceTree;
 use crate::vm::{Error as VmError, VmState};
 use micro_http::Body;
+use serde::{Deserialize, Serialize};
 use std::io;
 use std::sync::mpsc::{channel, RecvError, SendError, Sender};
 use std::sync::{Arc, Mutex};

vmm/src/config.rs

@@ -8,6 +8,7 @@ use net_util::MacAddr;
 use option_parser::{
     ByteSized, IntegerList, OptionParser, OptionParserError, StringList, Toggle, Tuple,
 };
+use serde::{Deserialize, Serialize};
 use std::collections::{BTreeSet, HashMap};
 use std::convert::From;
 use std::fmt;

vmm/src/device_manager.rs

@@ -65,6 +65,7 @@ use pci::{
     VfioUserPciDevice, VfioUserPciDeviceError,
 };
 use seccompiler::SeccompAction;
+use serde::{Deserialize, Serialize};
 use std::collections::{BTreeSet, HashMap};
 use std::convert::TryInto;
 use std::fs::{read_link, File, OpenOptions};

vmm/src/device_tree.rs

@@ -4,6 +4,7 @@
 
 use crate::device_manager::PciDeviceHandle;
 use pci::PciBdf;
+use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 use vm_device::Resource;

vmm/src/lib.rs

@@ -9,8 +9,6 @@ extern crate event_monitor;
 extern crate lazy_static;
 #[macro_use]
 extern crate log;
-#[macro_use]
-extern crate serde_derive;
 
 use crate::api::{
     ApiError, ApiRequest, ApiResponse, ApiResponsePayload, VmInfo, VmReceiveMigrationData,
@@ -30,7 +28,8 @@ use libc::EFD_NONBLOCK;
 use memory_manager::MemoryManagerSnapshotData;
 use pci::PciBdf;
 use seccompiler::{apply_filter, SeccompAction};
-use serde::ser::{Serialize, SerializeStruct, Serializer};
+use serde::ser::{SerializeStruct, Serializer};
+use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::fs::File;
 use std::io;

vmm/src/memory_manager.rs

@@ -17,6 +17,7 @@ use arch::{layout, RegionType};
 use devices::ioapic;
 #[cfg(target_arch = "x86_64")]
 use libc::{MAP_NORESERVE, MAP_POPULATE, MAP_SHARED, PROT_READ, PROT_WRITE};
+use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::convert::TryInto;
 use std::ffi;

vmm/src/vm.rs

@@ -57,6 +57,7 @@ use linux_loader::loader::elf::PvhBootCapability::PvhEntryPresent;
 use linux_loader::loader::pe::Error::InvalidImageMagicNumber;
 use linux_loader::loader::KernelLoader;
 use seccompiler::{apply_filter, SeccompAction};
+use serde::{Deserialize, Serialize};
 use signal_hook::{
     consts::{SIGINT, SIGTERM, SIGWINCH},
     iterator::backend::Handle,