diff --git a/libs/service_vm_comm/Android.bp b/libs/service_vm_comm/Android.bp
new file mode 100644
index 0000000..18397c5
--- /dev/null
+++ b/libs/service_vm_comm/Android.bp
@@ -0,0 +1,36 @@
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+rust_defaults {
+    name: "libservice_vm_comm_defaults",
+    crate_name: "service_vm_comm",
+    srcs: ["src/lib.rs"],
+    prefer_rlib: true,
+    apex_available: [
+        "com.android.virt",
+    ],
+}
+
+rust_library_rlib {
+    name: "libservice_vm_comm_nostd",
+    defaults: ["libservice_vm_comm_defaults"],
+    no_stdlibs: true,
+    stdlibs: [
+        "libcore.rust_sysroot",
+    ],
+    rustlibs: [
+        "libserde_nostd",
+    ],
+}
+
+rust_library {
+    name: "libservice_vm_comm",
+    defaults: ["libservice_vm_comm_defaults"],
+    rustlibs: [
+        "libserde",
+    ],
+    features: [
+        "std",
+    ],
+}
diff --git a/libs/service_vm_comm/src/lib.rs b/libs/service_vm_comm/src/lib.rs
new file mode 100644
index 0000000..c3d3ed5
--- /dev/null
+++ b/libs/service_vm_comm/src/lib.rs
@@ -0,0 +1,24 @@
+// Copyright 2023, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! This library contains the communication protocol used between the host
+//! and the service VM.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+extern crate alloc;
+
+mod message;
+
+pub use message::{Request, Response};
diff --git a/libs/service_vm_comm/src/message.rs b/libs/service_vm_comm/src/message.rs
new file mode 100644
index 0000000..ebbefcb
--- /dev/null
+++ b/libs/service_vm_comm/src/message.rs
@@ -0,0 +1,39 @@
+// Copyright 2023, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! This module contains the requests and responses definitions exchanged
+//! between the host and the service VM.
+
+use alloc::vec::Vec;
+
+use serde::{Deserialize, Serialize};
+
+/// Represents a request to be sent to the service VM.
+///
+/// Each request has a corresponding response item.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub enum Request {
+    /// Reverse the order of the bytes in the provided byte array.
+    /// Currently this is only used for testing.
+    Reverse(Vec<u8>),
+}
+
+/// Represents a response to a request sent to the service VM.
+///
+/// Each response corresponds to a specific request.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub enum Response {
+    /// Reverse the order of the bytes in the provided byte array.
+    Reverse(Vec<u8>),
+}
diff --git a/rialto/Android.bp b/rialto/Android.bp
index 7ac7136..33c24eb 100644
--- a/rialto/Android.bp
+++ b/rialto/Android.bp
@@ -9,10 +9,13 @@
     defaults: ["vmbase_ffi_defaults"],
     rustlibs: [
         "libaarch64_paging",
+        "libciborium_io_nostd",
+        "libciborium_nostd",
         "libhyp",
         "libfdtpci",
         "liblibfdt",
         "liblog_rust_nostd",
+        "libservice_vm_comm_nostd",
         "libvirtio_drivers",
         "libvmbase",
     ],
@@ -98,9 +101,11 @@
         "android.system.virtualizationservice-rust",
         "libandroid_logger",
         "libanyhow",
+        "libciborium",
         "liblibc",
         "liblog_rust",
         "libnix",
+        "libservice_vm_comm",
         "libvmclient",
         "libvsock",
     ],
diff --git a/rialto/src/communication.rs b/rialto/src/communication.rs
index f00393d..858ccfb 100644
--- a/rialto/src/communication.rs
+++ b/rialto/src/communication.rs
@@ -14,72 +14,174 @@
 
 //! Supports for the communication between rialto and host.
 
-use crate::error::{Error, Result};
+use crate::error::Result;
+use ciborium_io::{Read, Write};
+use core::hint::spin_loop;
+use core::result;
 use log::info;
+use service_vm_comm::{Request, Response};
 use virtio_drivers::{
     self,
     device::socket::{
-        SingleConnectionManager, SocketError, VirtIOSocket, VsockAddr, VsockEventType,
+        SocketError, VirtIOSocket, VsockAddr, VsockConnectionManager, VsockEventType,
     },
     transport::Transport,
     Hal,
 };
 
-const MAX_RECV_BUFFER_SIZE_BYTES: usize = 64;
-
-pub struct DataChannel<H: Hal, T: Transport> {
-    connection_manager: SingleConnectionManager<H, T>,
+pub struct VsockStream<H: Hal, T: Transport> {
+    connection_manager: VsockConnectionManager<H, T>,
+    /// Peer address. The same port is used on rialto and peer for convenience.
+    peer_addr: VsockAddr,
 }
 
-impl<H: Hal, T: Transport> From<VirtIOSocket<H, T>> for DataChannel<H, T> {
-    fn from(socket_device_driver: VirtIOSocket<H, T>) -> Self {
-        Self { connection_manager: SingleConnectionManager::new(socket_device_driver) }
+impl<H: Hal, T: Transport> VsockStream<H, T> {
+    pub fn new(
+        socket_device_driver: VirtIOSocket<H, T>,
+        peer_addr: VsockAddr,
+    ) -> virtio_drivers::Result<Self> {
+        let mut vsock_stream = Self {
+            connection_manager: VsockConnectionManager::new(socket_device_driver),
+            peer_addr,
+        };
+        vsock_stream.connect()?;
+        Ok(vsock_stream)
     }
-}
 
-impl<H: Hal, T: Transport> DataChannel<H, T> {
-    /// Connects to the given destination.
-    pub fn connect(&mut self, destination: VsockAddr) -> virtio_drivers::Result {
-        // Use the same port on rialto and host for convenience.
-        self.connection_manager.connect(destination, destination.port)?;
-        self.connection_manager.wait_for_connect()?;
-        info!("Connected to the destination {destination:?}");
+    fn connect(&mut self) -> virtio_drivers::Result {
+        self.connection_manager.connect(self.peer_addr, self.peer_addr.port)?;
+        self.wait_for_connect()?;
+        info!("Connected to the peer {:?}", self.peer_addr);
         Ok(())
     }
 
-    /// Processes the received requests and sends back a reply.
-    pub fn handle_incoming_request(&mut self) -> Result<()> {
-        let mut buffer = [0u8; MAX_RECV_BUFFER_SIZE_BYTES];
-
-        // TODO(b/274441673): Handle the scenario when the given buffer is too short.
-        let len = self.wait_for_recv(&mut buffer).map_err(Error::ReceivingDataFailed)?;
-
-        // TODO(b/291732060): Implement the communication protocol.
-        // Just reverse the received message for now.
-        buffer[..len].reverse();
-        self.connection_manager.send(&buffer[..len])?;
-        Ok(())
-    }
-
-    fn wait_for_recv(&mut self, buffer: &mut [u8]) -> virtio_drivers::Result<usize> {
+    fn wait_for_connect(&mut self) -> virtio_drivers::Result {
         loop {
-            match self.connection_manager.wait_for_recv(buffer)?.event_type {
-                VsockEventType::Disconnected { .. } => {
-                    return Err(SocketError::ConnectionFailed.into())
+            if let Some(event) = self.poll_event_from_peer()? {
+                match event {
+                    VsockEventType::Connected => return Ok(()),
+                    VsockEventType::Disconnected { .. } => {
+                        return Err(SocketError::ConnectionFailed.into())
+                    }
+                    // We shouldn't receive the following event before the connection is
+                    // established.
+                    VsockEventType::ConnectionRequest | VsockEventType::Received { .. } => {
+                        return Err(SocketError::InvalidOperation.into())
+                    }
+                    // We can receive credit requests and updates at any time.
+                    // This can be ignored as the connection manager handles them in poll().
+                    VsockEventType::CreditRequest | VsockEventType::CreditUpdate => {}
                 }
-                VsockEventType::Received { length, .. } => return Ok(length),
-                VsockEventType::Connected
-                | VsockEventType::ConnectionRequest
-                | VsockEventType::CreditRequest
-                | VsockEventType::CreditUpdate => {}
+            } else {
+                spin_loop();
             }
         }
     }
 
+    pub fn read_request(&mut self) -> Result<Request> {
+        Ok(ciborium::from_reader(self)?)
+    }
+
+    pub fn write_response(&mut self, response: &Response) -> Result<()> {
+        Ok(ciborium::into_writer(response, self)?)
+    }
+
     /// Shuts down the data channel.
-    pub fn force_close(&mut self) -> virtio_drivers::Result {
-        self.connection_manager.force_close()?;
+    pub fn shutdown(&mut self) -> virtio_drivers::Result {
+        self.connection_manager.force_close(self.peer_addr, self.peer_addr.port)?;
         info!("Connection shutdown.");
         Ok(())
     }
+
+    fn recv(&mut self, buffer: &mut [u8]) -> virtio_drivers::Result<usize> {
+        self.connection_manager.recv(self.peer_addr, self.peer_addr.port, buffer)
+    }
+
+    fn wait_for_send(&mut self, buffer: &[u8]) -> virtio_drivers::Result {
+        const INSUFFICIENT_BUFFER_SPACE_ERROR: virtio_drivers::Error =
+            virtio_drivers::Error::SocketDeviceError(SocketError::InsufficientBufferSpaceInPeer);
+        loop {
+            match self.connection_manager.send(self.peer_addr, self.peer_addr.port, buffer) {
+                Ok(_) => return Ok(()),
+                Err(INSUFFICIENT_BUFFER_SPACE_ERROR) => {
+                    self.poll()?;
+                }
+                Err(e) => return Err(e),
+            }
+        }
+    }
+
+    fn wait_for_recv(&mut self) -> virtio_drivers::Result {
+        loop {
+            match self.poll()? {
+                Some(VsockEventType::Received { .. }) => return Ok(()),
+                _ => spin_loop(),
+            }
+        }
+    }
+
+    /// Polls the rx queue after the connection is established with the peer, this function
+    /// rejects some invalid events. The valid events are handled inside the connection
+    /// manager.
+    fn poll(&mut self) -> virtio_drivers::Result<Option<VsockEventType>> {
+        if let Some(event) = self.poll_event_from_peer()? {
+            match event {
+                VsockEventType::Disconnected { .. } => Err(SocketError::ConnectionFailed.into()),
+                VsockEventType::Connected | VsockEventType::ConnectionRequest => {
+                    Err(SocketError::InvalidOperation.into())
+                }
+                // When there is a received event, the received data is buffered in the
+                // connection manager's internal receive buffer, so we don't need to do
+                // anything here.
+                // The credit request and updates also handled inside the connection
+                // manager.
+                VsockEventType::Received { .. }
+                | VsockEventType::CreditRequest
+                | VsockEventType::CreditUpdate => Ok(Some(event)),
+            }
+        } else {
+            Ok(None)
+        }
+    }
+
+    fn poll_event_from_peer(&mut self) -> virtio_drivers::Result<Option<VsockEventType>> {
+        Ok(self.connection_manager.poll()?.map(|event| {
+            assert_eq!(event.source, self.peer_addr);
+            assert_eq!(event.destination.port, self.peer_addr.port);
+            event.event_type
+        }))
+    }
+}
+
+impl<H: Hal, T: Transport> Read for VsockStream<H, T> {
+    type Error = virtio_drivers::Error;
+
+    fn read_exact(&mut self, data: &mut [u8]) -> result::Result<(), Self::Error> {
+        let mut start = 0;
+        while start < data.len() {
+            let len = self.recv(&mut data[start..])?;
+            let len = if len == 0 {
+                self.wait_for_recv()?;
+                self.recv(&mut data[start..])?
+            } else {
+                len
+            };
+            start += len;
+        }
+        Ok(())
+    }
+}
+
+impl<H: Hal, T: Transport> Write for VsockStream<H, T> {
+    type Error = virtio_drivers::Error;
+
+    fn write_all(&mut self, data: &[u8]) -> result::Result<(), Self::Error> {
+        self.wait_for_send(data)
+    }
+
+    fn flush(&mut self) -> result::Result<(), Self::Error> {
+        // TODO(b/293411448): Optimize the data sending by saving the data to write
+        // in a local buffer and then flushing only when the buffer is full.
+        Ok(())
+    }
 }
diff --git a/rialto/src/error.rs b/rialto/src/error.rs
index 461870b..23667ed 100644
--- a/rialto/src/error.rs
+++ b/rialto/src/error.rs
@@ -23,7 +23,10 @@
 
 pub type Result<T> = result::Result<T, Error>;
 
-#[derive(Clone, Debug)]
+type CiboriumSerError = ciborium::ser::Error<virtio_drivers::Error>;
+type CiboriumDeError = ciborium::de::Error<virtio_drivers::Error>;
+
+#[derive(Debug)]
 pub enum Error {
     /// Hypervisor error.
     Hypervisor(HypervisorError),
@@ -43,8 +46,10 @@
     MissingVirtIOSocketDevice,
     /// Failed VirtIO driver operation.
     VirtIODriverOperationFailed(virtio_drivers::Error),
-    /// Failed to receive data.
-    ReceivingDataFailed(virtio_drivers::Error),
+    /// Failed to serialize.
+    SerializationFailed(CiboriumSerError),
+    /// Failed to deserialize.
+    DeserializationFailed(CiboriumDeError),
 }
 
 impl fmt::Display for Error {
@@ -65,7 +70,8 @@
             Self::VirtIODriverOperationFailed(e) => {
                 write!(f, "Failed VirtIO driver operation: {e}")
             }
-            Self::ReceivingDataFailed(e) => write!(f, "Failed to receive data: {e}"),
+            Self::SerializationFailed(e) => write!(f, "Failed to serialize: {e}"),
+            Self::DeserializationFailed(e) => write!(f, "Failed to deserialize: {e}"),
         }
     }
 }
@@ -105,3 +111,15 @@
         Self::VirtIODriverOperationFailed(e)
     }
 }
+
+impl From<CiboriumSerError> for Error {
+    fn from(e: CiboriumSerError) -> Self {
+        Self::SerializationFailed(e)
+    }
+}
+
+impl From<CiboriumDeError> for Error {
+    fn from(e: CiboriumDeError) -> Self {
+        Self::DeserializationFailed(e)
+    }
+}
diff --git a/rialto/src/main.rs b/rialto/src/main.rs
index 5c6649a..a8338ca 100644
--- a/rialto/src/main.rs
+++ b/rialto/src/main.rs
@@ -20,10 +20,11 @@
 mod communication;
 mod error;
 mod exceptions;
+mod requests;
 
 extern crate alloc;
 
-use crate::communication::DataChannel;
+use crate::communication::VsockStream;
 use crate::error::{Error, Result};
 use core::num::NonZeroUsize;
 use core::slice;
@@ -137,10 +138,10 @@
     let socket_device = find_socket_device::<HalImpl>(&mut pci_root)?;
     debug!("Found socket device: guest cid = {:?}", socket_device.guest_cid());
 
-    let mut data_channel = DataChannel::from(socket_device);
-    data_channel.connect(host_addr())?;
-    data_channel.handle_incoming_request()?;
-    data_channel.force_close()?;
+    let mut vsock_stream = VsockStream::new(socket_device, host_addr())?;
+    let response = requests::process_request(vsock_stream.read_request()?);
+    vsock_stream.write_response(&response)?;
+    vsock_stream.shutdown()?;
 
     Ok(())
 }
diff --git a/rialto/src/requests/api.rs b/rialto/src/requests/api.rs
new file mode 100644
index 0000000..11fdde4
--- /dev/null
+++ b/rialto/src/requests/api.rs
@@ -0,0 +1,31 @@
+// Copyright 2023, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! This module contains the main API for the request processing module.
+
+use alloc::vec::Vec;
+use service_vm_comm::{Request, Response};
+
+/// Processes a request and returns the corresponding response.
+/// This function serves as the entry point for the request processing
+/// module.
+pub fn process_request(request: Request) -> Response {
+    match request {
+        Request::Reverse(v) => Response::Reverse(reverse(v)),
+    }
+}
+
+fn reverse(payload: Vec<u8>) -> Vec<u8> {
+    payload.into_iter().rev().collect()
+}
diff --git a/rialto/src/requests/mod.rs b/rialto/src/requests/mod.rs
new file mode 100644
index 0000000..ca22777
--- /dev/null
+++ b/rialto/src/requests/mod.rs
@@ -0,0 +1,19 @@
+// Copyright 2023, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! This module contains functions for the request processing.
+
+mod api;
+
+pub use api::process_request;
diff --git a/rialto/tests/test.rs b/rialto/tests/test.rs
index 8089016..2bd8968 100644
--- a/rialto/tests/test.rs
+++ b/rialto/tests/test.rs
@@ -22,10 +22,11 @@
     },
     binder::{ParcelFileDescriptor, ProcessState},
 };
-use anyhow::{anyhow, bail, Context, Error};
+use anyhow::{anyhow, bail, Context, Result};
 use log::info;
+use service_vm_comm::{Request, Response};
 use std::fs::File;
-use std::io::{self, BufRead, BufReader, Read, Write};
+use std::io::{self, BufRead, BufReader, BufWriter, Write};
 use std::os::unix::io::FromRawFd;
 use std::panic;
 use std::thread;
@@ -44,7 +45,7 @@
 const INSTANCE_IMG_SIZE: i64 = 1024 * 1024; // 1MB
 
 #[test]
-fn boot_rialto_in_protected_vm_successfully() -> Result<(), Error> {
+fn boot_rialto_in_protected_vm_successfully() -> Result<()> {
     boot_rialto_successfully(
         SIGNED_RIALTO_PATH,
         true, // protected_vm
@@ -52,14 +53,14 @@
 }
 
 #[test]
-fn boot_rialto_in_unprotected_vm_successfully() -> Result<(), Error> {
+fn boot_rialto_in_unprotected_vm_successfully() -> Result<()> {
     boot_rialto_successfully(
         UNSIGNED_RIALTO_PATH,
         false, // protected_vm
     )
 }
 
-fn boot_rialto_successfully(rialto_path: &str, protected_vm: bool) -> Result<(), Error> {
+fn boot_rialto_successfully(rialto_path: &str, protected_vm: bool) -> Result<()> {
     android_logger::init_once(
         android_logger::Config::default().with_tag("rialto").with_min_level(log::Level::Debug),
     );
@@ -169,27 +170,31 @@
     Ok(writer)
 }
 
-fn try_check_socket_connection(port: u32) -> Result<(), Error> {
+fn try_check_socket_connection(port: u32) -> Result<()> {
     info!("Setting up the listening socket on port {port}...");
     let listener = VsockListener::bind_with_cid_port(VMADDR_CID_HOST, port)?;
     info!("Listening on port {port}...");
 
-    let Some(Ok(mut vsock_stream)) = listener.incoming().next() else {
-        bail!("Failed to get vsock_stream");
-    };
+    let mut vsock_stream =
+        listener.incoming().next().ok_or_else(|| anyhow!("Failed to get vsock_stream"))??;
     info!("Accepted connection {:?}", vsock_stream);
-
-    let message = "Hello from host";
-    vsock_stream.write_all(message.as_bytes())?;
-    vsock_stream.flush()?;
-    info!("Sent message: {:?}.", message);
-
-    let mut buffer = vec![0u8; 30];
     vsock_stream.set_read_timeout(Some(Duration::from_millis(1_000)))?;
-    let len = vsock_stream.read(&mut buffer)?;
 
-    assert_eq!(message.len(), len);
-    buffer[..len].reverse();
-    assert_eq!(message.as_bytes(), &buffer[..len]);
+    const WRITE_BUFFER_CAPACITY: usize = 512;
+    let mut buffer = BufWriter::with_capacity(WRITE_BUFFER_CAPACITY, vsock_stream.clone());
+
+    // TODO(b/292080257): Test with message longer than the receiver's buffer capacity
+    // 1024 bytes once the guest virtio-vsock driver fixes the credit update in recv().
+    let message = "abc".repeat(166);
+    let request = Request::Reverse(message.as_bytes().to_vec());
+    ciborium::into_writer(&request, &mut buffer)?;
+    buffer.flush()?;
+    info!("Sent request: {request:?}.");
+
+    let response: Response = ciborium::from_reader(&mut vsock_stream)?;
+    info!("Received response: {response:?}.");
+
+    let expected_response: Vec<u8> = message.as_bytes().iter().rev().cloned().collect();
+    assert_eq!(Response::Reverse(expected_response), response);
     Ok(())
 }