diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
new file mode 100644
index 000000000..3efe07c96
--- /dev/null
+++ b/.github/workflows/rust.yml
@@ -0,0 +1,37 @@
+name: Rust
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  check-style:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Report rustfmt version
+      run: cargo fmt -- --version
+    - name: Check style
+      run: cargo fmt -- --check
+  build-docs:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: dtolnay/rust-toolchain@nightly
+    - name: Test build documentation
+      run: cargo doc
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: dtolnay/rust-toolchain@nightly
+    - name: Build
+      run: cargo build --verbose
+    - name: Test
+      run: cargo test --verbose
+
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 000000000..271fdf1c9
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,7 @@
+[workspace]
+
+members = [
+  "propolis",
+  "propolis-cli",
+  "propolis-server",
+]
diff --git a/propolis-server/src/main.rs b/propolis-server/src/main.rs
index 6f0e58342..29f47f505 100644
--- a/propolis-server/src/main.rs
+++ b/propolis-server/src/main.rs
@@ -118,13 +118,14 @@ async fn instance_ensure(
 
     // Create the instance.
     let lowmem = (properties.memory * 1024 * 1024) as usize;
-    let instance = build_instance(&properties.id.to_string(), properties.vcpus, lowmem)
-        .map_err(|err| {
-        HttpError::for_internal_error(format!(
-            "Cannot build instance: {}",
-            err.to_string()
-        ))
-    })?;
+    let instance =
+        build_instance(&properties.id.to_string(), properties.vcpus, lowmem)
+            .map_err(|err| {
+                HttpError::for_internal_error(format!(
+                    "Cannot build instance: {}",
+                    err.to_string()
+                ))
+            })?;
 
     // Initialize (some) of the instance's hardware.
     //