diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 34d2b8e02..9c44a37bf 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -16,25 +16,7 @@ updates:
       - "kind/dependencies"
     open-pull-requests-limit: 20
   - package-ecosystem: "cargo"
-    directory: "/src/tests/rust_guests/dummyguest"
-    schedule:
-      interval: "daily"
-      time: "03:00"
-    labels:
-      - "kind/dependencies"
-      - "area/guest"
-    open-pull-requests-limit: 5
-  - package-ecosystem: "cargo"
-    directory: "/src/tests/rust_guests/simpleguest"
-    schedule:
-      interval: "daily"
-      time: "03:00"
-    labels:
-      - "kind/dependencies"
-      - "area/guest"
-    open-pull-requests-limit: 5
-  - package-ecosystem: "cargo"
-    directory: "/src/tests/rust_guests/witguest"
+    directory: "/src/tests/rust_guests"
     schedule:
       interval: "daily"
       time: "03:00"
diff --git a/.github/workflows/RustNightly.yml b/.github/workflows/RustNightly.yml
index a04941d93..df0b02b13 100644
--- a/.github/workflows/RustNightly.yml
+++ b/.github/workflows/RustNightly.yml
@@ -61,9 +61,7 @@ jobs:
         uses: actions/cache@v5
         with:
           path: |
-            src/tests/rust_guests/simpleguest/target/sysroot
-            src/tests/rust_guests/dummyguest/target/sysroot
-            src/tests/rust_guests/witguest/target/sysroot
+            src/tests/rust_guests/target/sysroot
           key: sysroot-linux-${{ matrix.config }}-${{ hashFiles('rust-toolchain.toml') }}
 
       - name: Rust cache
@@ -73,9 +71,7 @@ jobs:
           cache-on-failure: "true"
           workspaces: |
             . -> target
-            src/tests/rust_guests/simpleguest -> target
-            src/tests/rust_guests/dummyguest -> target
-            src/tests/rust_guests/witguest -> target
+            src/tests/rust_guests -> target
 
       - name: Install cargo-hyperlight
         run: cargo install cargo-hyperlight --version 0.1.10 --locked --force
diff --git a/.github/workflows/ValidatePullRequest.yml b/.github/workflows/ValidatePullRequest.yml
index 68c8a3980..4ab524674 100644
--- a/.github/workflows/ValidatePullRequest.yml
+++ b/.github/workflows/ValidatePullRequest.yml
@@ -41,9 +41,9 @@ jobs:
             return all_file_count === docs_file_count;
           result-encoding: string
 
-  # Update guest Cargo.lock files for Dependabot PRs.
-  # Dependabot only updates the root Cargo.lock, leaving the guest crate
-  # Cargo.lock files stale. This job updates them before code-checks runs
+  # Update guest Cargo.lock for Dependabot PRs.
+  # Dependabot only updates the root Cargo.lock, leaving the guest workspace
+  # Cargo.lock stale. This job updates it before code-checks runs
   # `cargo fetch --locked` so that the first CI run succeeds.
   update-guest-locks:
     if: github.event.pull_request.user.login == 'dependabot[bot]'
diff --git a/.github/workflows/dep_build_guests.yml b/.github/workflows/dep_build_guests.yml
index 324b2e83c..c7965e31e 100644
--- a/.github/workflows/dep_build_guests.yml
+++ b/.github/workflows/dep_build_guests.yml
@@ -51,9 +51,7 @@ jobs:
         uses: actions/cache@v5
         with:
           path: |
-            src/tests/rust_guests/simpleguest/target/sysroot
-            src/tests/rust_guests/dummyguest/target/sysroot
-            src/tests/rust_guests/witguest/target/sysroot
+            src/tests/rust_guests/target/sysroot
           key: sysroot-linux-${{ inputs.config }}-${{ hashFiles('rust-toolchain.toml') }}
 
       - name: Rust cache
@@ -66,9 +64,7 @@ jobs:
           save-if: ${{ github.ref == 'refs/heads/main' }}
           workspaces: |
             . -> target
-            src/tests/rust_guests/simpleguest -> target
-            src/tests/rust_guests/dummyguest -> target
-            src/tests/rust_guests/witguest -> target
+            src/tests/rust_guests -> target
 
       - name: Install cargo-hyperlight
         run: cargo install cargo-hyperlight --version 0.1.10 --locked --force
diff --git a/.github/workflows/dep_code_checks.yml b/.github/workflows/dep_code_checks.yml
index 87110bbf4..e44971555 100644
--- a/.github/workflows/dep_code_checks.yml
+++ b/.github/workflows/dep_code_checks.yml
@@ -47,9 +47,7 @@ jobs:
         uses: actions/cache@v5
         with:
           path: |
-            src/tests/rust_guests/simpleguest/target/sysroot
-            src/tests/rust_guests/dummyguest/target/sysroot
-            src/tests/rust_guests/witguest/target/sysroot
+            src/tests/rust_guests/target/sysroot
           key: sysroot-linux-${{ hashFiles('rust-toolchain.toml') }}
 
       - name: Rust cache
@@ -62,16 +60,12 @@ jobs:
           save-if: ${{ github.ref == 'refs/heads/main' }}
           workspaces: |
             . -> target
-            src/tests/rust_guests/simpleguest -> target
-            src/tests/rust_guests/dummyguest -> target
-            src/tests/rust_guests/witguest -> target
+            src/tests/rust_guests -> target
 
       - name: Ensure up-to-date Cargo.lock
         run: |
           cargo fetch --locked
-          cargo fetch --manifest-path src/tests/rust_guests/simpleguest/Cargo.toml --locked
-          cargo fetch --manifest-path src/tests/rust_guests/dummyguest/Cargo.toml --locked
-          cargo fetch --manifest-path src/tests/rust_guests/witguest/Cargo.toml --locked
+          cargo fetch --manifest-path src/tests/rust_guests/Cargo.toml --locked
 
       - name: fmt
         run: just fmt-check
@@ -121,9 +115,7 @@ jobs:
         uses: actions/cache@v5
         with:
           path: |
-            src/tests/rust_guests/simpleguest/target/sysroot
-            src/tests/rust_guests/dummyguest/target/sysroot
-            src/tests/rust_guests/witguest/target/sysroot
+            src/tests/rust_guests/target/sysroot
           key: sysroot-windows-${{ hashFiles('rust-toolchain.toml') }}
 
       - name: Rust cache
@@ -136,16 +128,12 @@ jobs:
           save-if: ${{ github.ref == 'refs/heads/main' }}
           workspaces: |
             . -> target
-            src/tests/rust_guests/simpleguest -> target
-            src/tests/rust_guests/dummyguest -> target
-            src/tests/rust_guests/witguest -> target
+            src/tests/rust_guests -> target
 
       - name: Ensure up-to-date Cargo.lock
         run: |
           cargo fetch --locked
-          cargo fetch --manifest-path src/tests/rust_guests/simpleguest/Cargo.toml --locked
-          cargo fetch --manifest-path src/tests/rust_guests/dummyguest/Cargo.toml --locked
-          cargo fetch --manifest-path src/tests/rust_guests/witguest/Cargo.toml --locked
+          cargo fetch --manifest-path src/tests/rust_guests/Cargo.toml --locked
 
       - name: fmt
         run: just fmt-check
diff --git a/.github/workflows/dep_update_guest_locks.yml b/.github/workflows/dep_update_guest_locks.yml
index 94bd392ce..215012a3b 100644
--- a/.github/workflows/dep_update_guest_locks.yml
+++ b/.github/workflows/dep_update_guest_locks.yml
@@ -1,8 +1,8 @@
 # yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
 
-# This reusable workflow updates the Cargo.lock files in guest crates when
+# This reusable workflow updates the guest workspace Cargo.lock when
 # Dependabot updates dependencies. Without this, Dependabot PRs only update the
-# root Cargo.lock, leaving the guest crate Cargo.lock files stale.
+# root Cargo.lock, leaving the guest workspace Cargo.lock stale.
 #
 # See: https://docs.github.com/en/code-security/tutorials/secure-your-dependencies/automating-dependabot-with-github-actions
 
@@ -55,16 +55,8 @@ jobs:
         run: |
           sudo chown -R $(id -u):$(id -g) /opt/cargo || true
 
-      - name: Update simpleguest Cargo.lock
-        working-directory: src/tests/rust_guests/simpleguest
-        run: cargo fetch
-
-      - name: Update dummyguest Cargo.lock
-        working-directory: src/tests/rust_guests/dummyguest
-        run: cargo fetch
-
-      - name: Update witguest Cargo.lock
-        working-directory: src/tests/rust_guests/witguest
+      - name: Update guest Cargo.lock
+        working-directory: src/tests/rust_guests
         run: cargo fetch
 
       # Commits created via the Git Data API are automatically signed/verified
@@ -88,13 +80,13 @@ jobs:
         run: |
           set -euo pipefail
 
-          # Check if there are any changes to the guest Cargo.lock files
-          if git diff --quiet -- src/tests/rust_guests/*/Cargo.lock; then
-            echo "No changes to guest Cargo.lock files"
+          # Check if there are any changes to the guest Cargo.lock file
+          if git diff --quiet -- src/tests/rust_guests/Cargo.lock; then
+            echo "No changes to guest Cargo.lock file"
             exit 0
           fi
 
-          echo "Guest Cargo.lock files have changed, committing via API..."
+          echo "Guest Cargo.lock file has changed, committing via API..."
 
           # Get app identity for DCO sign-off trailer
           # Use the app-slug output from create-github-app-token (the /app API
@@ -110,7 +102,7 @@ jobs:
           # The tree API accepts "content" directly and creates blobs for us,
           # avoiding the need for separate blob creation API calls.
           TREE_JSON="[]"
-          for file in $(git diff --name-only -- src/tests/rust_guests/*/Cargo.lock); do
+          for file in $(git diff --name-only -- src/tests/rust_guests/Cargo.lock); do
             TREE_JSON=$(jq \
               --arg path "$file" \
               --arg content "$(cat "$file")" \
@@ -128,7 +120,7 @@ jobs:
           # Build commit message with DCO sign-off
           SIGNOFF="${app_slug}[bot] <${app_user_id}+${app_slug}[bot]@users.noreply.github.com>"
           COMMIT_MSG=$(printf '%s\n\n%s\n%s\n\n%s' \
-            "chore: update guest Cargo.lock files" \
+            "chore: update guest Cargo.lock file" \
             "Automatically updated by dependabot-update-guest-locks workflow." \
             "Triggered by: ${PR_TITLE}" \
             "Signed-off-by: ${SIGNOFF}")
diff --git a/Cargo.toml b/Cargo.toml
index e693368d0..e9b69f40d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,11 +20,10 @@ members = [
     "src/hyperlight_component_macro",
     "src/trace_dump",
 ]
-# Guests have custom linker flags, so we need to exclude them from the workspace
+# Guests have custom linker flags and live in their own nested workspace,
+# so we exclude the whole directory from the host workspace.
 exclude = [
-    "src/tests/rust_guests/dummyguest",
-    "src/tests/rust_guests/simpleguest",
-    "src/tests/rust_guests/witguest",
+    "src/tests/rust_guests",
 ]
 
 [workspace.package]
diff --git a/Justfile b/Justfile
index bd569fa64..401897425 100644
--- a/Justfile
+++ b/Justfile
@@ -24,9 +24,13 @@ export CROSS_CONTAINER_GID := if path_exists("/dev/kvm") == "true" { kvm-gid } e
 root := justfile_directory()
 
 default-target := "debug"
-simpleguest_source := "src/tests/rust_guests/simpleguest/target/x86_64-hyperlight-none"
-dummyguest_source := "src/tests/rust_guests/dummyguest/target/x86_64-hyperlight-none"
-witguest_source := "src/tests/rust_guests/witguest/target/x86_64-hyperlight-none"
+# All three guest crates share one workspace under src/tests/rust_guests,
+# so they share one target dir and hyperlight-libc / hyperlight-guest-bin
+# get compiled once per profile instead of once per crate.
+rust_guests_target := "src/tests/rust_guests/target/x86_64-hyperlight-none"
+simpleguest_source := rust_guests_target
+dummyguest_source := rust_guests_target
+witguest_source := rust_guests_target
 rust_guests_bin_dir := "src/tests/rust_guests/bin"
 
 ################
@@ -52,9 +56,10 @@ witguest-wit:
     cd src/tests/rust_guests/witguest && wasm-tools component wit two_worlds.wit -w -o twoworlds.wasm
 
 build-rust-guests target=default-target features="": (witguest-wit) (ensure-cargo-hyperlight)
-    cd src/tests/rust_guests/simpleguest && cargo hyperlight build {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} 
-    cd src/tests/rust_guests/dummyguest && cargo hyperlight build {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} 
-    cd src/tests/rust_guests/witguest && cargo hyperlight build {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }}
+    @# --workspace unifies feature resolution so shared deps build once. Needed because witguest
+    @# pulls bindgen via hyperlight-component-macro, which would otherwise turn on extra features
+    @# on libc's build.rs host deps and force a libc rebuild. simple/dummyguest don't hit this.
+    cd src/tests/rust_guests && cargo hyperlight build --workspace {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }}
 
 @move-rust-guests target=default-target:
     cp {{ simpleguest_source }}/{{ target }}/simpleguest* {{ rust_guests_bin_dir }}/{{ target }}/
@@ -68,9 +73,7 @@ clean: clean-rust
 
 clean-rust: 
     cargo clean
-    cd src/tests/rust_guests/simpleguest && cargo clean
-    cd src/tests/rust_guests/dummyguest && cargo clean
-    {{ if os() == "windows" { "cd src/tests/rust_guests/witguest -ErrorAction SilentlyContinue; cargo clean" } else { "[ -d src/tests/rust_guests/witguest ] && cd src/tests/rust_guests/witguest && cargo clean || true" } }}
+    cd src/tests/rust_guests && cargo clean
     {{ if os() == "windows" { "Remove-Item src/tests/rust_guests/witguest/interface.wasm -Force -ErrorAction SilentlyContinue" } else { "rm -f src/tests/rust_guests/witguest/interface.wasm" } }}
     git clean -fdx src/tests/c_guests/bin src/tests/rust_guests/bin
 
@@ -106,9 +109,7 @@ test-like-ci config=default-target hypervisor="kvm":
 code-checks-like-ci config=default-target hypervisor="kvm":
     @# Ensure up-to-date Cargo.lock
     cargo fetch --locked
-    cargo fetch --manifest-path src/tests/rust_guests/simpleguest/Cargo.toml --locked
-    cargo fetch --manifest-path src/tests/rust_guests/dummyguest/Cargo.toml --locked
-    cargo fetch --manifest-path src/tests/rust_guests/witguest/Cargo.toml --locked
+    cargo fetch --manifest-path src/tests/rust_guests/Cargo.toml --locked
 
     @# fmt
     just fmt-check
@@ -297,9 +298,7 @@ check:
 
 fmt-check: (ensure-nightly-fmt)
     cargo +{{nightly-toolchain}} fmt --all -- --check
-    cargo +{{nightly-toolchain}} fmt --manifest-path src/tests/rust_guests/simpleguest/Cargo.toml -- --check
-    cargo +{{nightly-toolchain}} fmt --manifest-path src/tests/rust_guests/dummyguest/Cargo.toml -- --check
-    cargo +{{nightly-toolchain}} fmt --manifest-path src/tests/rust_guests/witguest/Cargo.toml -- --check
+    cargo +{{nightly-toolchain}} fmt --manifest-path src/tests/rust_guests/Cargo.toml --all -- --check
     cargo +{{nightly-toolchain}} fmt --manifest-path src/hyperlight_guest_capi/Cargo.toml -- --check
 
 [private]
@@ -311,9 +310,7 @@ check-license-headers:
 
 fmt-apply: (ensure-nightly-fmt)
     cargo +{{nightly-toolchain}} fmt --all
-    cargo +{{nightly-toolchain}} fmt --manifest-path src/tests/rust_guests/simpleguest/Cargo.toml
-    cargo +{{nightly-toolchain}} fmt --manifest-path src/tests/rust_guests/dummyguest/Cargo.toml
-    cargo +{{nightly-toolchain}} fmt --manifest-path src/tests/rust_guests/witguest/Cargo.toml
+    cargo +{{nightly-toolchain}} fmt --manifest-path src/tests/rust_guests/Cargo.toml --all
     cargo +{{nightly-toolchain}} fmt --manifest-path src/hyperlight_guest_capi/Cargo.toml
 
 clippy target=default-target: (witguest-wit)
@@ -324,8 +321,7 @@ clippyw target=default-target: (witguest-wit)
     {{ cargo-cmd }} clippy --all-targets --all-features --target x86_64-pc-windows-gnu --profile={{ if target == "debug" { "dev" } else { target } }}  -- -D warnings
 
 clippy-guests target=default-target: (witguest-wit) (ensure-cargo-hyperlight)
-    cd src/tests/rust_guests/simpleguest && cargo hyperlight clippy --profile={{ if target == "debug" { "dev" } else { target } }} -- -D warnings
-    cd src/tests/rust_guests/witguest && cargo hyperlight clippy --profile={{ if target == "debug" { "dev" } else { target } }} -- -D warnings
+    cd src/tests/rust_guests && cargo hyperlight clippy --workspace --profile={{ if target == "debug" { "dev" } else { target } }} -- -D warnings
 
 clippy-apply-fix-unix:
     cargo clippy --fix --all 
diff --git a/dev/check-license-headers.sh b/dev/check-license-headers.sh
index 88104b1ff..68cefc1b9 100755
--- a/dev/check-license-headers.sh
+++ b/dev/check-license-headers.sh
@@ -34,7 +34,7 @@ MISSING_FILES=""
 # Find all Rust files, excluding target directory
 while IFS= read -r -d $'\0' file; do
     # Skip some files which appear when the guests are build
-    if grep -q '^src/tests/rust_guests/[^/]*/target/' <<< "$file"; then
+    if grep -q '^src/tests/rust_guests/target/' <<< "$file"; then
         continue
     fi
 
diff --git a/flake.nix b/flake.nix
index cbec54678..fe048320d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -114,9 +114,7 @@
 
           manifests = [
             "Cargo.toml"
-            "src/tests/rust_guests/dummyguest/Cargo.toml"
-            "src/tests/rust_guests/simpleguest/Cargo.toml"
-            "src/tests/rust_guests/witguest/Cargo.toml"
+            "src/tests/rust_guests/Cargo.toml"
           ];
           manifestDeps = builtins.map (manifest:
             let lockPath = builtins.replaceStrings [ "toml" ] [ "lock" ] manifest; in
diff --git a/src/tests/rust_guests/witguest/Cargo.lock b/src/tests/rust_guests/Cargo.lock
similarity index 92%
rename from src/tests/rust_guests/witguest/Cargo.lock
rename to src/tests/rust_guests/Cargo.lock
index fed561889..fb9a7e0d1 100644
--- a/src/tests/rust_guests/witguest/Cargo.lock
+++ b/src/tests/rust_guests/Cargo.lock
@@ -83,15 +83,15 @@ dependencies = [
  "quote",
  "regex",
  "rustc-hash",
- "shlex",
+ "shlex 1.3.0",
  "syn",
 ]
 
 [[package]]
 name = "bitflags"
-version = "2.11.1"
+version = "2.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c4512299f36f043ab09a583e57bceb5a5aab7a73db1805848e8fef3c9e8c78b3"
+checksum = "84d7ced0ae9557296835c32bf1b1e02b44c746701f898460fb000d7eaa84f00a"
 
 [[package]]
 name = "buddy_system_allocator"
@@ -124,12 +124,12 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.2.61"
+version = "1.2.63"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d16d90359e986641506914ba71350897565610e87ce0ad9e6f28569db3dd5c6d"
+checksum = "556e016178bb5662a08681bbe0f00f8e17631781a4dfc8c45e466e4b185ec27f"
 dependencies = [
  "find-msvc-tools",
- "shlex",
+ "shlex 2.0.1",
 ]
 
 [[package]]
@@ -164,11 +164,19 @@ version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
 
+[[package]]
+name = "dummyguest"
+version = "0.10.0"
+dependencies = [
+ "hyperlight-common",
+ "hyperlight-guest-bin",
+]
+
 [[package]]
 name = "either"
-version = "1.15.0"
+version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
+checksum = "91622ff5e7162018101f2fea40d6ebf4a78bbe5a49736a2020649edf9693679e"
 
 [[package]]
 name = "env_filter"
@@ -229,9 +237,9 @@ checksum = "0cc23270f6e1808e30a928bdc84dea0b9b4136a8bc82338574f23baf47bbd280"
 
 [[package]]
 name = "hashbrown"
-version = "0.17.0"
+version = "0.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4f467dd6dccf739c208452f8014c75c18bb8301b050ad1cfb27153803edb0f51"
+checksum = "ed5909b6e89a2db4456e54cd5f673791d7eca6732202bbf2a9cc504fe2f9b84a"
 dependencies = [
  "foldhash",
  "serde",
@@ -382,9 +390,9 @@ checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
 
 [[package]]
 name = "jiff"
-version = "0.2.24"
+version = "0.2.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f00b5dbd620d61dfdcb6007c9c1f6054ebd75319f163d886a9055cec1155073d"
+checksum = "4603d3033e49e2b0e31229fcab20a5d40089c607d975cd9c80551dc69eed9102"
 dependencies = [
  "jiff-static",
  "log",
@@ -395,9 +403,9 @@ dependencies = [
 
 [[package]]
 name = "jiff-static"
-version = "0.2.24"
+version = "0.2.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e000de030ff8022ea1da3f466fbb0f3a809f5e51ed31f6dd931c35181ad8e6d7"
+checksum = "782d32378dddf207193ac91cefb848ad41abb58195c95168e1291227a0832b47"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -451,15 +459,15 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.30"
+version = "0.4.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "616ec5685824bcc94416c6d4a7a446eea774a31efd7062c8480ba6fd06d7a6e5"
+checksum = "113b30b4cd05f7c06868fdb2854f66a7b9fece9a48425351cd532e810d74024f"
 
 [[package]]
 name = "memchr"
-version = "2.8.0"
+version = "2.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f8ca58f447f06ed17d5fc4043ce1b10dd205e060fb3ce5b979b8ed8e59ff3f79"
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