diff --git a/.github/workflows/cargo-llvm-cov.yml b/.github/workflows/cargo-llvm-cov.yml
index 207c324bc8cab..6ae80aff0a986 100644
--- a/.github/workflows/cargo-llvm-cov.yml
+++ b/.github/workflows/cargo-llvm-cov.yml
@@ -60,20 +60,14 @@ jobs:
         uses: codecov/codecov-action@v3
         with:
           files: lcov.info
-          fail_ci_if_error: true
-
-      # TODO: Will enable this once we get this work
-      #
-      # - name: Run code coverage for simtest
-      #   run: |
-      #     ./scripts/simtest/install.sh
-      #     CODECOV=1 ./scripts/simtest/cargo-simtest simtest
-
-      # - name: Upload report to Codecov for simtest
-      #   uses: codecov/codecov-action@v3
-      #   with:
-      #     files: lcov.info
-      #     fail_ci_if_error: true
+
+      - name: Run code coverage for simtest
+        run: ./scripts/simtest/codecov.sh
+
+      - name: Upload report to Codecov for simtest
+        uses: codecov/codecov-action@v3
+        with:
+          files: lcov-simtest.info
 
   notify:
     name: Notify
diff --git a/scripts/simtest/cargo-simtest b/scripts/simtest/cargo-simtest
index 3f7511963272d..f8f44c6c87b10 100755
--- a/scripts/simtest/cargo-simtest
+++ b/scripts/simtest/cargo-simtest
@@ -93,10 +93,6 @@ if [ "$1" = "build" ]; then
   CARGO_COMMAND=(build --profile simulator)
 fi
 
-if [ -n "$CODECOV" ]; then
-  CARGO_COMMAND=(llvm-cov --ignore-run-fail --lcov --output-path lcov.info nextest --cargo-profile simulator)
-fi
-
 # Must supply a new temp dir - the test is deterministic and can't choose one randomly itself.
 export TMPDIR=$(mktemp -d)
 
diff --git a/scripts/simtest/codecov.sh b/scripts/simtest/codecov.sh
new file mode 100755
index 0000000000000..afdd148855633
--- /dev/null
+++ b/scripts/simtest/codecov.sh
@@ -0,0 +1,17 @@
+#!/bin/bash -e
+# Copyright (c) Mysten Labs, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+# verify that git repo is clean
+if [[ -n $(git status -s) ]]; then
+  echo "Working directory is not clean. Please commit all changes before running this script."
+  exit 1
+fi
+
+# apply git patch
+git apply ./scripts/simtest/config-patch
+
+MSIM_WATCHDOG_TIMEOUT_MS=60000 MSIM_TEST_SEED=1 cargo llvm-cov --ignore-run-fail --lcov --output-path lcov-simtest.info nextest --cargo-profile simulator
+
+# remove the patch
+git checkout .cargo/config Cargo.toml Cargo.lock
diff --git a/scripts/simtest/config-patch b/scripts/simtest/config-patch
new file mode 100644
index 0000000000000..4fc2cf4ec1b4f
--- /dev/null
+++ b/scripts/simtest/config-patch
@@ -0,0 +1,36 @@
+diff --git a/.cargo/config b/.cargo/config
+index 7369a2afce..5254870044 100644
+--- a/.cargo/config
++++ b/.cargo/config
+@@ -20,11 +20,11 @@ move-clippy = [
+     "-Aclippy::upper_case_acronyms",
+     "-Aclippy::type_complexity",
+     # Remove after https://github.com/rust-lang/rust-clippy/pull/11792 is released.
+     "-Aclippy::map_identity",
+     "-Aclippy::new_without_default",
+     "-Aclippy::box_default",
+     "-Aclippy::manual_slice_size_calculation",
+ ]
+ 
+ [build]
+-rustflags = ["-C", "force-frame-pointers=yes", "-C", "force-unwind-tables=yes"]
++rustflags = ["-C", "force-frame-pointers=yes", "-C", "force-unwind-tables=yes", "--cfg", "msim"]
+diff --git a/Cargo.toml b/Cargo.toml
+index 3b1ca4591c..e4ff4d61d2 100644
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -672,10 +672,14 @@ semver = "1.0.16"
+ spinners = "4.1.0"
+ include_dir = "0.7.3"
+ 
+ 
+ # Using the workspace-hack via this patch directive means that it only applies
+ # while building within this workspace. If another workspace imports a crate
+ # from here via a git dependency, it will not have the workspace-hack applied
+ # to it.
+ [patch.crates-io.workspace-hack]
+ path = "crates/workspace-hack"
++
++[patch.crates-io]
++tokio = { git = "https://github.com/MystenLabs/mysten-sim.git", rev = "1a52783d6600ecc22e15253a982f77881bd47c77" }
++futures-timer = { git = "https://github.com/MystenLabs/mysten-sim.git", rev = "1a52783d6600ecc22e15253a982f77881bd47c77" }