diff --git a/arch/src/x86_64/tdx/mod.rs b/arch/src/x86_64/tdx/mod.rs
index 0f2eb8d43..43bdb3641 100644
--- a/arch/src/x86_64/tdx/mod.rs
+++ b/arch/src/x86_64/tdx/mod.rs
@@ -46,7 +46,7 @@ pub struct TdvfSection {
 }
 
 #[repr(u32)]
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, Default)]
 pub enum TdvfSectionType {
     Bfv,
     Cfv,
@@ -55,15 +55,10 @@ pub enum TdvfSectionType {
     PermMem,
     Payload,
     PayloadParam,
+    #[default]
     Reserved = 0xffffffff,
 }
 
-impl Default for TdvfSectionType {
-    fn default() -> Self {
-        TdvfSectionType::Reserved
-    }
-}
-
 pub fn parse_tdvf_sections(file: &mut File) -> Result<Vec<TdvfSection>, TdvfError> {
     // The 32-bit offset to the TDVF metadata is located 32 bytes from
     // the end of the file.
@@ -120,21 +115,16 @@ pub fn parse_tdvf_sections(file: &mut File) -> Result<Vec<TdvfSection>, TdvfErro
 }
 
 #[repr(u16)]
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, Default)]
 enum HobType {
     Handoff = 0x1,
     ResourceDescriptor = 0x3,
     GuidExtension = 0x4,
+    #[default]
     Unused = 0xfffe,
     EndOfHobList = 0xffff,
 }
 
-impl Default for HobType {
-    fn default() -> Self {
-        HobType::Unused
-    }
-}
-
 #[repr(C)]
 #[derive(Copy, Clone, Default, Debug)]
 struct HobHeader {
@@ -184,19 +174,14 @@ struct HobGuidType {
 }
 
 #[repr(u32)]
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, Default)]
 pub enum PayloadImageType {
+    #[default]
     ExecutablePayload,
     BzImage,
     RawVmLinux,
 }
 
-impl Default for PayloadImageType {
-    fn default() -> Self {
-        PayloadImageType::ExecutablePayload
-    }
-}
-
 #[repr(C)]
 #[derive(Copy, Clone, Default, Debug)]
 pub struct PayloadInfo {
diff --git a/performance-metrics/src/performance_tests.rs b/performance-metrics/src/performance_tests.rs
index 707ee8719..07dbcbd50 100644
--- a/performance-metrics/src/performance_tests.rs
+++ b/performance-metrics/src/performance_tests.rs
@@ -168,7 +168,6 @@ fn parse_boot_time_output(output: &[u8]) -> Result<f64, Error> {
     std::panic::catch_unwind(|| {
         let l: Vec<String> = String::from_utf8_lossy(output)
             .lines()
-            .into_iter()
             .filter(|l| l.contains("Debug I/O port: Kernel code"))
             .map(|l| l.to_string())
             .collect();
diff --git a/vfio_user/src/lib.rs b/vfio_user/src/lib.rs
index f97769558..24187f9ea 100644
--- a/vfio_user/src/lib.rs
+++ b/vfio_user/src/lib.rs
@@ -24,8 +24,9 @@ extern crate log;
 
 #[allow(dead_code)]
 #[repr(u16)]
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, Default)]
 enum Command {
+    #[default]
     Unknown = 0,
     Version = 1,
     DmaMap = 2,
@@ -43,28 +44,17 @@ enum Command {
     UserDirtyPages = 14,
 }
 
-impl Default for Command {
-    fn default() -> Self {
-        Command::Unknown
-    }
-}
-
 #[allow(dead_code)]
 #[repr(u32)]
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
 enum HeaderFlags {
+    #[default]
     Command = 0,
     Reply = 1,
     NoReply = 1 << 4,
     Error = 1 << 5,
 }
 
-impl Default for HeaderFlags {
-    fn default() -> Self {
-        HeaderFlags::Command
-    }
-}
-
 #[repr(C)]
 #[derive(Default, Clone, Copy, Debug)]
 struct Header {
diff --git a/vmm/src/vm_config.rs b/vmm/src/vm_config.rs
index 6a5f9d22b..8286f5fe1 100644
--- a/vmm/src/vm_config.rs
+++ b/vmm/src/vm_config.rs
@@ -127,18 +127,13 @@ pub struct MemoryZoneConfig {
     pub prefault: bool,
 }
 
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Deserialize, Serialize)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Deserialize, Serialize, Default)]
 pub enum HotplugMethod {
+    #[default]
     Acpi,
     VirtioMem,
 }
 
-impl Default for HotplugMethod {
-    fn default() -> Self {
-        HotplugMethod::Acpi
-    }
-}
-
 fn default_memoryconfig_thp() -> bool {
     true
 }
@@ -188,18 +183,13 @@ impl Default for MemoryConfig {
     }
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
+#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize, Default)]
 pub enum VhostMode {
+    #[default]
     Client,
     Server,
 }
 
-impl Default for VhostMode {
-    fn default() -> Self {
-        VhostMode::Client
-    }
-}
-
 #[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
 pub struct DiskConfig {
     pub path: Option<PathBuf>,