Add clippy::cast_lossless warning

Related issue - #3196

Signed-off-by: StemCll [email protected]

Author: StemCll

src/cpuid/src/bit_helper.rs

@@ -148,7 +148,7 @@ impl BitHelper for u32 {
         assert!(pos <= MAX_U32_BIT_INDEX, "Invalid pos");
 
         *self &= !(1 << pos);
-        *self |= (val as u32) << pos;
+        *self |= (u32::from(val)) << pos;
         self
     }
 

src/cpuid/src/transformer/mod.rs

@@ -36,7 +36,7 @@ impl VmSpec {
             cpu_vendor_id,
             cpu_index,
             cpu_count,
-            cpu_bits: (cpu_count > 1 && smt) as u8,
+            cpu_bits: u8::from(cpu_count > 1 && smt),
             brand_string: BrandString::from_vendor_id(&cpu_vendor_id),
         })
     }

src/devices/src/virtio/balloon/device.rs

@@ -303,7 +303,7 @@ impl Balloon {
             // Remove the page ranges.
             for (page_frame_number, range_len) in page_ranges {
                 let guest_addr =
-                    GuestAddress((page_frame_number as u64) << VIRTIO_BALLOON_PFN_SHIFT);
+                    GuestAddress(u64::from(page_frame_number) << VIRTIO_BALLOON_PFN_SHIFT);
 
                 if let Err(err) = remove_range(
                     mem,
@@ -365,7 +365,7 @@ impl Balloon {
                 // so we ignore the rest of it.
                 let addr = head
                     .addr
-                    .checked_add(index as u64)
+                    .checked_add(u64::from(index))
                     .ok_or(BalloonError::MalformedDescriptor)?;
                 let stat = mem
                     .read_obj::<BalloonStat>(addr)
@@ -445,8 +445,8 @@ impl Balloon {
 
     pub fn update_timer_state(&mut self) {
         let timer_state = TimerState::Periodic {
-            current: Duration::from_secs(self.stats_polling_interval_s as u64),
-            interval: Duration::from_secs(self.stats_polling_interval_s as u64),
+            current: Duration::from_secs(u64::from(self.stats_polling_interval_s)),
+            interval: Duration::from_secs(u64::from(self.stats_polling_interval_s)),
         };
         self.stats_timer
             .set_state(timer_state, SetTimeFlags::Default);
@@ -687,7 +687,7 @@ pub(crate) mod tests {
 
                 let features: u64 = (1u64 << VIRTIO_F_VERSION_1)
                     | ((if *deflate_on_oom { 1 } else { 0 }) << VIRTIO_BALLOON_F_DEFLATE_ON_OOM)
-                    | ((*stats_interval as u64) << VIRTIO_BALLOON_F_STATS_VQ);
+                    | ((u64::from(*stats_interval)) << VIRTIO_BALLOON_F_STATS_VQ);
 
                 assert_eq!(balloon.avail_features_by_page(0), features as u32);
                 assert_eq!(balloon.avail_features_by_page(1), (features >> 32) as u32);

src/devices/src/virtio/balloon/persist.rs

@@ -145,8 +145,8 @@ impl Persist<'_> for Balloon {
 
                 // Restart timer if needed.
                 let timer_state = TimerState::Periodic {
-                    current: Duration::from_secs(state.stats_polling_interval_s as u64),
-                    interval: Duration::from_secs(state.stats_polling_interval_s as u64),
+                    current: Duration::from_secs(u64::from(state.stats_polling_interval_s)),
+                    interval: Duration::from_secs(u64::from(state.stats_polling_interval_s)),
                 };
                 balloon
                     .stats_timer

src/devices/src/virtio/block/io/async_io.rs

@@ -67,7 +67,7 @@ impl<T> AsyncFileEngine<T> {
 
         let completion_evt = EventFd::new(libc::EFD_NONBLOCK).map_err(Error::EventFd)?;
         let ring = IoUring::new(
-            IO_URING_NUM_ENTRIES as u32,
+            u32::from(IO_URING_NUM_ENTRIES),
             vec![&file],
             vec![
                 // Make sure we only allow operations on pre-registered fds.

src/devices/src/virtio/block/io/mod.rs

@@ -239,14 +239,14 @@ pub mod tests {
 
     fn check_dirty_mem(mem: &GuestMemoryMmap, addr: GuestAddress, len: u32) {
         let bitmap = mem.find_region(addr).unwrap().bitmap().as_ref().unwrap();
-        for offset in addr.0..addr.0 + len as u64 {
+        for offset in addr.0..addr.0 + u64::from(len) {
             assert!(bitmap.dirty_at(offset as usize));
         }
     }
 
     fn check_clean_mem(mem: &GuestMemoryMmap, addr: GuestAddress, len: u32) {
         let bitmap = mem.find_region(addr).unwrap().bitmap().as_ref().unwrap();
-        for offset in addr.0..addr.0 + len as u64 {
+        for offset in addr.0..addr.0 + u64::from(len) {
             assert!(!bitmap.dirty_at(offset as usize));
         }
     }

src/devices/src/virtio/mmio.rs

@@ -235,7 +235,7 @@ impl BusDevice for MmioTransport {
                         features
                     }
                     0x34 => self.with_queue(0, |q| u32::from(q.get_max_size())),
-                    0x44 => self.with_queue(0, |q| q.ready as u32),
+                    0x44 => self.with_queue(0, |q| u32::from(q.ready)),
                     0x60 => self.interrupt_status.load(Ordering::SeqCst) as u32,
                     0x70 => self.device_status,
                     0xfc => self.config_generation,
@@ -513,7 +513,7 @@ pub(crate) mod tests {
         assert_eq!(read_le_u32(&buf[..]), 16);
 
         d.read(0x44, &mut buf[..]);
-        assert_eq!(read_le_u32(&buf[..]), false as u32);
+        assert_eq!(read_le_u32(&buf[..]), u32::from(false));
 
         d.interrupt_status.store(111, Ordering::SeqCst);
         d.read(0x60, &mut buf[..]);

src/devices/src/virtio/net/test_utils.rs

@@ -424,10 +424,10 @@ pub mod test {
                     desc.next.set(next_index);
                 }
 
-                addr += len as u64;
+                addr += u64::from(len);
                 // Add small random gaps between descriptor addresses in order to make sure we
                 // don't blindly read contiguous memory.
-                addr += utils::rand::xor_psuedo_rng_u32() as u64 % 10;
+                addr += u64::from(utils::rand::xor_psuedo_rng_u32()) % 10;
             }
 
             // Mark the chain as available.

src/devices/src/virtio/test_utils.rs

@@ -324,7 +324,7 @@ impl<'a> VirtQueue<'a> {
 
     pub fn check_used_elem(&self, used_index: u16, expected_id: u16, expected_len: u32) {
         let used_elem = self.used.ring[used_index as usize].get();
-        assert_eq!(used_elem.id, expected_id as u32);
+        assert_eq!(used_elem.id, u32::from(expected_id));
         assert_eq!(used_elem.len, expected_len);
     }
 }

src/io_uring/src/lib.rs

@@ -365,7 +365,8 @@ impl IoUring {
         let supported_opcodes: HashSet<u8> = probes
             .as_slice()
             .iter()
-            .filter(|op| ((op.flags as u32) & bindings::IO_URING_OP_SUPPORTED) != 0)
+            //.filter(|op| ((op.flags as u32) & bindings::IO_URING_OP_SUPPORTED) != 0)
+            .filter(|op| ((u32::from(op.flags)) & bindings::IO_URING_OP_SUPPORTED) != 0)
             .map(|op| op.op)
             .collect();
 

src/mmds/src/token.rs

@@ -277,7 +277,7 @@ impl TokenAuthority {
         // to current time (also in milliseconds). This addition is safe
         // because ttl is verified beforehand and can never be more than
         // 6h (21_600_000 ms).
-        now_as_milliseconds.add(ttl_as_seconds as u64 * MILLISECONDS_PER_SECOND)
+        now_as_milliseconds.add(u64::from(ttl_as_seconds) * MILLISECONDS_PER_SECOND)
     }
 }
 

src/snapshot/src/lib.rs

@@ -94,7 +94,7 @@ fn get_format_version(magic_id: u64) -> Result<u16, Error> {
 }
 
 fn build_magic_id(format_version: u16) -> u64 {
-    BASE_MAGIC_ID | format_version as u64
+    BASE_MAGIC_ID | u64::from(format_version)
 }
 
 impl Snapshot {

src/vmm/src/lib.rs

@@ -693,7 +693,7 @@ impl Vmm {
     ) -> std::result::Result<(), BalloonError> {
         // The balloon cannot have a target size greater than the size of
         // the guest memory.
-        if amount_mib as u64 > mem_size_mib(self.guest_memory()) {
+        if u64::from(amount_mib) > mem_size_mib(self.guest_memory()) {
             return Err(BalloonError::TooManyPagesRequested);
         }
 

src/vmm/src/vmm_config/vsock.rs

@@ -159,7 +159,7 @@ pub(crate) mod tests {
         vsock_config.guest_cid = new_cid;
         store.insert(vsock_config).unwrap();
         let vsock = store.get().unwrap();
-        assert_eq!(vsock.lock().unwrap().cid(), new_cid as u64);
+        assert_eq!(vsock.lock().unwrap().cid(), u64::from(new_cid));
     }
 
     #[test]

src/vmm/src/vstate/vcpu/x86_64.rs

@@ -438,8 +438,8 @@ impl KvmVcpu {
         // We accept values within a tolerance of 250 parts
         // per million beacuse it is common for TSC frequency
         // to differ due to calibration at boot time.
-        let diff = (self.get_tsc_khz()? as i64 - state_tsc_freq as i64).abs();
-        Ok(diff > (state_tsc_freq as f64 * TSC_KHZ_TOL).round() as i64)
+        let diff = (i64::from(self.get_tsc_khz()?) - i64::from(state_tsc_freq)).abs();
+        Ok(diff > (f64::from(state_tsc_freq) * TSC_KHZ_TOL).round() as i64)
     }
 
     // Scale the TSC frequency of this vCPU to the one provided as a parameter.

tests/integration_tests/build/test_clippy.py

@@ -9,20 +9,20 @@
 
 SUCCESS_CODE = 0
 MACHINE = platform.machine()
-TARGETS = ["{}-unknown-linux-gnu".format(MACHINE),
-           "{}-unknown-linux-musl".format(MACHINE)]
+TARGETS = [
+    "{}-unknown-linux-gnu".format(MACHINE),
+    "{}-unknown-linux-musl".format(MACHINE),
+]
 
 
-@pytest.mark.parametrize(
-    "target",
-    TARGETS
-)
+@pytest.mark.parametrize("target", TARGETS)
 def test_rust_clippy(target):
     """
     Test that clippy does not generate any errors/warnings.
 
     @type: build
     """
     utils.run_cmd(
-        'cargo clippy --target {} --all --profile test'
-        ' -- -D warnings'.format(target))
+        "cargo clippy --target {} --all --profile test"
+        " -- -D warnings -D clippy::cast_lossless".format(target)
+    )