diff --git a/authfs/src/fusefs.rs b/authfs/src/fusefs.rs
index 03f832d..84129b6 100644
--- a/authfs/src/fusefs.rs
+++ b/authfs/src/fusefs.rs
@@ -49,7 +49,10 @@
 pub type Inode = u64;
 type Handle = u64;
 
-const DEFAULT_METADATA_TIMEOUT: Duration = Duration::from_secs(5);
+/// Maximum time for a file's metadata to be cached by the kernel. Since any file and directory
+/// changes (if not read-only) has to go through AuthFS to be trusted, the timeout can be maximum.
+const DEFAULT_METADATA_TIMEOUT: Duration = Duration::MAX;
+
 const ROOT_INODE: Inode = 1;
 
 /// `AuthFsEntry` defines the filesystem entry type supported by AuthFS.
diff --git a/compos/src/compilation.rs b/compos/src/compilation.rs
index ae4a29d..6049991 100644
--- a/compos/src/compilation.rs
+++ b/compos/src/compilation.rs
@@ -22,12 +22,9 @@
 use std::collections::HashMap;
 use std::env;
 use std::ffi::OsString;
-use std::fs::read_dir;
 use std::path::{self, Path, PathBuf};
 use std::process::Command;
 
-use crate::artifact_signer::ArtifactSigner;
-use crate::signing_key::DiceSigner;
 use authfs_aidl_interface::aidl::com::android::virt::fs::{
     AuthFsConfig::{
         AuthFsConfig, InputDirFdAnnotation::InputDirFdAnnotation,
@@ -105,12 +102,15 @@
     system_properties::read_bool(name, false).unwrap_or(false)
 }
 
-pub fn odrefresh(
+pub fn odrefresh<F>(
     odrefresh_path: &Path,
     context: OdrefreshContext,
     authfs_service: Strong<dyn IAuthFsService>,
-    signer: DiceSigner,
-) -> Result<ExitCode> {
+    success_fn: F,
+) -> Result<ExitCode>
+where
+    F: FnOnce(PathBuf) -> Result<()>,
+{
     // Mount authfs (via authfs_service). The authfs instance unmounts once the `authfs` variable
     // is out of scope.
     let authfs_config = AuthFsConfig {
@@ -183,13 +183,8 @@
     info!("odrefresh exited with {:?}", exit_code);
 
     if exit_code == ExitCode::CompilationSuccess {
-        // authfs only shows us the files we created, so it's ok to just sign everything under
-        // the target directory.
         let target_dir = art_apex_data.join(context.target_dir_name);
-        let mut artifact_signer = ArtifactSigner::new(&target_dir);
-        add_artifacts(&target_dir, &mut artifact_signer)?;
-
-        artifact_signer.write_info_and_signature(signer, &target_dir.join("compos.info"))?;
+        success_fn(target_dir)?;
     }
 
     Ok(exit_code)
@@ -245,24 +240,6 @@
     Ok(())
 }
 
-fn add_artifacts(target_dir: &Path, artifact_signer: &mut ArtifactSigner) -> Result<()> {
-    for entry in
-        read_dir(&target_dir).with_context(|| format!("Traversing {}", target_dir.display()))?
-    {
-        let entry = entry?;
-        let file_type = entry.file_type()?;
-        if file_type.is_dir() {
-            add_artifacts(&entry.path(), artifact_signer)?;
-        } else if file_type.is_file() {
-            artifact_signer.add_artifact(&entry.path())?;
-        } else {
-            // authfs shouldn't create anything else, but just in case
-            bail!("Unexpected file type in artifacts: {:?}", entry);
-        }
-    }
-    Ok(())
-}
-
 fn spawn_jailed_task(executable: &Path, args: &[String], env_vars: &[String]) -> Result<Minijail> {
     // TODO(b/185175567): Run in a more restricted sandbox.
     let jail = Minijail::new()?;
diff --git a/compos/src/compsvc.rs b/compos/src/compsvc.rs
index 3ec15dd..5f3ee62 100644
--- a/compos/src/compsvc.rs
+++ b/compos/src/compsvc.rs
@@ -18,17 +18,19 @@
 //! file descriptors backed by authfs (via authfs_service) and pass the file descriptors to the
 //! actual compiler.
 
-use anyhow::{Context, Result};
+use anyhow::{bail, Context, Result};
 use binder_common::new_binder_exception;
 use compos_common::binder::to_binder_result;
 use log::warn;
 use std::default::Default;
-use std::path::PathBuf;
+use std::fs::read_dir;
+use std::path::{Path, PathBuf};
 use std::sync::RwLock;
 
+use crate::artifact_signer::ArtifactSigner;
 use crate::compilation::{odrefresh, OdrefreshContext};
 use crate::dice::Dice;
-use crate::signing_key::{DiceSigner, DiceSigningKey};
+use crate::signing_key::DiceSigningKey;
 use authfs_aidl_interface::aidl::com::android::virt::fs::IAuthFsService::IAuthFsService;
 use compos_aidl_interface::aidl::com::android::compos::{
     CompOsKeyData::CompOsKeyData,
@@ -57,17 +59,6 @@
     key_blob: RwLock<Vec<u8>>,
 }
 
-impl CompOsService {
-    fn new_signer(&self) -> BinderResult<DiceSigner> {
-        let key = &*self.key_blob.read().unwrap();
-        if key.is_empty() {
-            Err(new_binder_exception(ExceptionCode::ILLEGAL_STATE, "Key is not initialized"))
-        } else {
-            to_binder_result(self.signing_key.new_signer(key))
-        }
-    }
-}
-
 impl Interface for CompOsService {}
 
 impl ICompOsService for CompOsService {
@@ -91,6 +82,14 @@
         zygote_arch: &str,
         system_server_compiler_filter: &str,
     ) -> BinderResult<i8> {
+        let key = &*self.key_blob.read().unwrap();
+        if key.is_empty() {
+            return Err(new_binder_exception(
+                ExceptionCode::ILLEGAL_STATE,
+                "Key is not initialized",
+            ));
+        }
+
         let context = to_binder_result(OdrefreshContext::new(
             compilation_mode,
             system_dir_fd,
@@ -103,8 +102,16 @@
 
         let authfs_service = get_authfs_service()?;
         let exit_code = to_binder_result(
-            odrefresh(&self.odrefresh_path, context, authfs_service, self.new_signer()?)
-                .context("odrefresh failed"),
+            odrefresh(&self.odrefresh_path, context, authfs_service, |output_dir| {
+                // authfs only shows us the files we created, so it's ok to just sign everything
+                // under the output directory.
+                let mut artifact_signer = ArtifactSigner::new(&output_dir);
+                add_artifacts(&output_dir, &mut artifact_signer)?;
+
+                let signer = to_binder_result(self.signing_key.new_signer(key))?;
+                artifact_signer.write_info_and_signature(signer, &output_dir.join("compos.info"))
+            })
+            .context("odrefresh failed"),
         )?;
         Ok(exit_code as i8)
     }
@@ -126,3 +133,21 @@
 fn get_authfs_service() -> BinderResult<Strong<dyn IAuthFsService>> {
     Ok(authfs_aidl_interface::binder::get_interface(AUTHFS_SERVICE_NAME)?)
 }
+
+fn add_artifacts(target_dir: &Path, artifact_signer: &mut ArtifactSigner) -> Result<()> {
+    for entry in
+        read_dir(&target_dir).with_context(|| format!("Traversing {}", target_dir.display()))?
+    {
+        let entry = entry?;
+        let file_type = entry.file_type()?;
+        if file_type.is_dir() {
+            add_artifacts(&entry.path(), artifact_signer)?;
+        } else if file_type.is_file() {
+            artifact_signer.add_artifact(&entry.path())?;
+        } else {
+            // authfs shouldn't create anything else, but just in case
+            bail!("Unexpected file type in artifacts: {:?}", entry);
+        }
+    }
+    Ok(())
+}
diff --git a/microdroid/dice/android.hardware.security.dice-service.microdroid.rc b/microdroid/dice/android.hardware.security.dice-service.microdroid.rc
index 162081e..7d9d441 100644
--- a/microdroid/dice/android.hardware.security.dice-service.microdroid.rc
+++ b/microdroid/dice/android.hardware.security.dice-service.microdroid.rc
@@ -1,3 +1,3 @@
 service vendor.dice-microdroid /vendor/bin/hw/android.hardware.security.dice-service.microdroid
-    class early_hal
-    user nobody
+    user diced
+    group diced
diff --git a/microdroid/dice/service.rs b/microdroid/dice/service.rs
index 3401654..8cb5cc3 100644
--- a/microdroid/dice/service.rs
+++ b/microdroid/dice/service.rs
@@ -14,17 +14,103 @@
 
 //! Main entry point for the microdroid IDiceDevice HAL implementation.
 
-use anyhow::Result;
+use anyhow::{bail, Error, Result};
+use byteorder::{NativeEndian, ReadBytesExt};
 use diced::{
     dice,
     hal_node::{DiceArtifacts, DiceDevice, ResidentHal, UpdatableDiceArtifacts},
 };
+use libc::{c_void, mmap, munmap, MAP_FAILED, MAP_PRIVATE, PROT_READ};
 use serde::{Deserialize, Serialize};
+use std::fs;
+use std::os::unix::io::AsRawFd;
 use std::panic;
+use std::path::{Path, PathBuf};
+use std::ptr::null_mut;
+use std::slice;
 use std::sync::Arc;
 
 const DICE_HAL_SERVICE_NAME: &str = "android.hardware.security.dice.IDiceDevice/default";
 
+/// Artifacts that are mapped into the process address space from the driver.
+struct MappedDriverArtifacts<'a> {
+    mmap_addr: *mut c_void,
+    mmap_size: usize,
+    cdi_attest: &'a [u8; dice::CDI_SIZE],
+    cdi_seal: &'a [u8; dice::CDI_SIZE],
+    bcc: &'a [u8],
+}
+
+impl MappedDriverArtifacts<'_> {
+    fn new(driver_path: &Path) -> Result<Self> {
+        let mut file = fs::File::open(driver_path)
+            .map_err(|error| Error::new(error).context("Opening driver"))?;
+        let mmap_size =
+            file.read_u64::<NativeEndian>()
+                .map_err(|error| Error::new(error).context("Reading driver"))? as usize;
+        // It's safe to map the driver as the service will only create a single
+        // mapping per process.
+        let mmap_addr = unsafe {
+            let fd = file.as_raw_fd();
+            mmap(null_mut(), mmap_size, PROT_READ, MAP_PRIVATE, fd, 0)
+        };
+        if mmap_addr == MAP_FAILED {
+            bail!("Failed to mmap {:?}", driver_path);
+        }
+        // The slice is created for the region of memory that was just
+        // successfully mapped into the process address space so it will be
+        // accessible and not referenced from anywhere else.
+        let mmap_buf =
+            unsafe { slice::from_raw_parts((mmap_addr as *const u8).as_ref().unwrap(), mmap_size) };
+        // Very inflexible parsing / validation of the BccHandover data. Assumes deterministically
+        // encoded CBOR.
+        //
+        // BccHandover = {
+        //   1 : bstr .size 32,     ; CDI_Attest
+        //   2 : bstr .size 32,     ; CDI_Seal
+        //   3 : Bcc,               ; Certificate chain
+        // }
+        if mmap_buf[0..4] != [0xa3, 0x01, 0x58, 0x20]
+            || mmap_buf[36..39] != [0x02, 0x58, 0x20]
+            || mmap_buf[71] != 0x03
+        {
+            bail!("BccHandover format mismatch");
+        }
+        Ok(Self {
+            mmap_addr,
+            mmap_size,
+            cdi_attest: mmap_buf[4..36].try_into().unwrap(),
+            cdi_seal: mmap_buf[39..71].try_into().unwrap(),
+            bcc: &mmap_buf[72..],
+        })
+    }
+}
+
+impl Drop for MappedDriverArtifacts<'_> {
+    fn drop(&mut self) {
+        // All references to the mapped region have the same lifetime as self.
+        // Since self is being dropped, so are all the references to the mapped
+        // region meaning its safe to unmap.
+        let ret = unsafe { munmap(self.mmap_addr, self.mmap_size) };
+        if ret != 0 {
+            log::warn!("Failed to munmap ({})", ret);
+        }
+    }
+}
+
+impl DiceArtifacts for MappedDriverArtifacts<'_> {
+    fn cdi_attest(&self) -> &[u8; dice::CDI_SIZE] {
+        self.cdi_attest
+    }
+    fn cdi_seal(&self) -> &[u8; dice::CDI_SIZE] {
+        self.cdi_seal
+    }
+    fn bcc(&self) -> Vec<u8> {
+        // The BCC only contains public information so it's fine to copy.
+        self.bcc.to_vec()
+    }
+}
+
 /// Artifacts that are kept in the process address space after the artifacts
 /// from the driver have been consumed.
 #[derive(Clone, Serialize, Deserialize)]
@@ -49,19 +135,26 @@
 
 #[derive(Clone, Serialize, Deserialize)]
 enum DriverArtifactManager {
+    Driver(PathBuf),
     Updated(RawArtifacts),
 }
 
 impl DriverArtifactManager {
-    fn new() -> Self {
-        // TODO(214231981): replace with true values passed by bootloader
-        let (cdi_attest, cdi_seal, bcc) = diced_sample_inputs::make_sample_bcc_and_cdis()
-            .expect("Failed to create sample dice artifacts.");
-        Self::Updated(RawArtifacts {
-            cdi_attest: cdi_attest[..].try_into().unwrap(),
-            cdi_seal: cdi_seal[..].try_into().unwrap(),
-            bcc,
-        })
+    fn new(driver_path: &Path) -> Self {
+        // TODO(218793274): fail if driver is missing in protected mode
+        if driver_path.exists() {
+            log::info!("Using DICE values from driver");
+            Self::Driver(driver_path.to_path_buf())
+        } else {
+            log::warn!("Using sample DICE values");
+            let (cdi_attest, cdi_seal, bcc) = diced_sample_inputs::make_sample_bcc_and_cdis()
+                .expect("Failed to create sample dice artifacts.");
+            Self::Updated(RawArtifacts {
+                cdi_attest: cdi_attest[..].try_into().unwrap(),
+                cdi_seal: cdi_seal[..].try_into().unwrap(),
+                bcc,
+            })
+        }
     }
 }
 
@@ -71,10 +164,17 @@
         F: FnOnce(&dyn DiceArtifacts) -> Result<T>,
     {
         match self {
+            Self::Driver(driver_path) => f(&MappedDriverArtifacts::new(driver_path.as_path())?),
             Self::Updated(raw_artifacts) => f(raw_artifacts),
         }
     }
     fn update(self, new_artifacts: &impl DiceArtifacts) -> Result<Self> {
+        if let Self::Driver(driver_path) = self {
+            // Writing to the device wipes the artifcates. The string is ignored
+            // by the driver but included for documentation.
+            fs::write(driver_path, "wipe")
+                .map_err(|error| Error::new(error).context("Wiping driver"))?;
+        }
         Ok(Self::Updated(RawArtifacts {
             cdi_attest: *new_artifacts.cdi_attest(),
             cdi_seal: *new_artifacts.cdi_seal(),
@@ -102,7 +202,7 @@
             // Safety: ResidentHal cannot be used in multi threaded processes.
             // This service does not start a thread pool. The main thread is the only thread
             // joining the thread pool, thereby keeping the process single threaded.
-            ResidentHal::new(DriverArtifactManager::new())
+            ResidentHal::new(DriverArtifactManager::new(Path::new("/dev/open-dice0")))
         }
         .expect("Failed to create ResidentHal implementation."),
     );
diff --git a/microdroid/payload/mk_payload.cc b/microdroid/payload/mk_payload.cc
index 33e91b9..fd1ce78 100644
--- a/microdroid/payload/mk_payload.cc
+++ b/microdroid/payload/mk_payload.cc
@@ -171,6 +171,7 @@
         auto* apex = metadata.add_apexes();
         apex->set_name(apex_config.name);
         apex->set_partition_name("microdroid-apex-" + std::to_string(apex_index++));
+        apex->set_is_factory(true);
     }
 
     if (config.apk.has_value()) {
diff --git a/microdroid/ueventd.rc b/microdroid/ueventd.rc
index 037b8fc..340a1f7 100644
--- a/microdroid/ueventd.rc
+++ b/microdroid/ueventd.rc
@@ -27,3 +27,5 @@
 
 # Virtual console for logcat
 /dev/hvc2                 0660   logd       logd
+
+/dev/open-dice0           0660   diced      diced
diff --git a/microdroid_manager/src/instance.rs b/microdroid_manager/src/instance.rs
index 4d65421..267a0e3 100644
--- a/microdroid_manager/src/instance.rs
+++ b/microdroid_manager/src/instance.rs
@@ -322,7 +322,6 @@
     pub apk_data: ApkData,
     pub extra_apks_data: Vec<ApkData>,
     pub apex_data: Vec<ApexData>,
-    pub bootconfig: Box<[u8]>,
 }
 
 #[derive(Debug, Serialize, Deserialize, PartialEq)]
diff --git a/microdroid_manager/src/main.rs b/microdroid_manager/src/main.rs
index 827f9ff..005baf6 100644
--- a/microdroid_manager/src/main.rs
+++ b/microdroid_manager/src/main.rs
@@ -34,7 +34,6 @@
 use log::{error, info};
 use microdroid_metadata::{write_metadata, Metadata};
 use microdroid_payload_config::{Task, TaskType, VmPayloadConfig};
-use once_cell::sync::OnceCell;
 use payload::{get_apex_data_from_payload, load_metadata, to_metadata};
 use rand::Fill;
 use ring::digest;
@@ -42,7 +41,6 @@
 use rustutils::system_properties::PropertyWatcher;
 use std::convert::TryInto;
 use std::fs::{self, create_dir, File, OpenOptions};
-use std::io::BufRead;
 use std::os::unix::io::{FromRawFd, IntoRawFd};
 use std::path::Path;
 use std::process::{Child, Command, Stdio};
@@ -308,13 +306,6 @@
 ) -> Result<MicrodroidData> {
     let start_time = SystemTime::now();
 
-    if let Some(saved_bootconfig) = saved_data.map(|d| &d.bootconfig) {
-        ensure!(
-            saved_bootconfig.as_ref() == get_bootconfig()?.as_slice(),
-            MicrodroidError::PayloadChanged(String::from("Bootconfig has changed."))
-        );
-    }
-
     // Verify main APK
     let root_hash = saved_data.map(|d| &d.apk_data.root_hash);
     let root_hash_from_idsig = get_apk_root_hash_from_idsig(MAIN_APK_IDSIG_PATH)?;
@@ -455,7 +446,6 @@
         apk_data: ApkData { root_hash: root_hash_from_idsig, pubkey: main_apk_pubkey },
         extra_apks_data,
         apex_data: apex_data_from_payload,
-        bootconfig: get_bootconfig()?.clone().into_boxed_slice(),
     })
 }
 
@@ -506,35 +496,6 @@
     }
 }
 
-fn get_bootconfig() -> Result<&'static Vec<u8>> {
-    static VAL: OnceCell<Vec<u8>> = OnceCell::new();
-    VAL.get_or_try_init(|| -> Result<Vec<u8>> {
-        let f = File::open("/proc/bootconfig")?;
-
-        // Filter-out androidboot.vbmeta.device which contains UUID of the vbmeta partition. That
-        // UUID could change everytime when the same VM is started because the composite disk image
-        // is ephemeral. A change in UUID is okay as long as other configs (e.g.
-        // androidboot.vbmeta.digest) remain same.
-        Ok(std::io::BufReader::new(f)
-            .lines()
-            // note: this try_fold is to early return when we fail to read a line from the file
-            .try_fold(Vec::new(), |mut lines, line| {
-                line.map(|s| {
-                    lines.push(s);
-                    lines
-                })
-            })?
-            .into_iter()
-            .filter(|line| {
-                let tokens: Vec<&str> = line.splitn(2, '=').collect();
-                // note: if `line` doesn't have =, tokens[0] is the entire line.
-                tokens[0].trim() != "androidboot.vbmeta.device"
-            })
-            .flat_map(|line| (line + "\n").into_bytes())
-            .collect())
-    })
-}
-
 fn load_config(path: &Path) -> Result<VmPayloadConfig> {
     info!("loading config from {:?}...", path);
     let file = ioutil::wait_for_file(path, WAIT_TIMEOUT)?;