Use Cargo hyperlight to build rust guests (#1084)

* Use Cargo hyperlight to build rust guests

Signed-off-by: James Sturtevant <jsturtevant@gmail.com>

* Fixed typo in README

Signed-off-by: Simon Davies <simongdavies@users.noreply.github.com>

---------

Signed-off-by: James Sturtevant <jsturtevant@gmail.com>
Signed-off-by: Simon Davies <simongdavies@users.noreply.github.com>
Co-authored-by: Simon Davies <simongdavies@users.noreply.github.com>

Author: jsturtevant

Justfile

@@ -23,9 +23,9 @@ 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-unknown-none"
-dummyguest_source := "src/tests/rust_guests/dummyguest/target/x86_64-unknown-none"
-witguest_source := "src/tests/rust_guests/witguest/target/x86_64-unknown-none"
+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"
 rust_guests_bin_dir := "src/tests/rust_guests/bin"
 
 ################
@@ -47,9 +47,10 @@ witguest-wit:
     cd src/tests/rust_guests/witguest && wasm-tools component wit guest.wit -w -o interface.wasm
 
 build-rust-guests target=default-target features="": (witguest-wit)
-    cd src/tests/rust_guests/simpleguest && cargo 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 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 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 } }}
+    cargo install --locked 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 } }}
 
 @move-rust-guests target=default-target:
     cp {{ simpleguest_source }}/{{ target }}/simpleguest* {{ rust_guests_bin_dir }}/{{ target }}/
@@ -257,8 +258,9 @@ clippyw target=default-target: (witguest-wit)
     {{ cargo-cmd }} clippy --all-features --target x86_64-pc-windows-gnu --profile={{ if target == "debug" { "dev" } else { target } }}  -- -D warnings
 
 clippy-guests target=default-target: (witguest-wit)
-    cd src/tests/rust_guests/simpleguest && cargo clippy --profile={{ if target == "debug" { "dev" } else { target } }} -- -D warnings
-    cd src/tests/rust_guests/witguest && cargo clippy --profile={{ if target == "debug" { "dev" } else { target } }} -- -D warnings
+    cargo install --locked 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
 
 clippy-apply-fix-unix:
     cargo clippy --fix --all 

README.md

@@ -104,26 +104,11 @@ pub fn guest_dispatch_function(function_call: FunctionCall) -> Result<Vec<u8>> {
 }
 ```
 
-**Note**: Guest applications require a specific build configuration. Create a `.cargo/config.toml` file in your guest project with the following content:
-
-```toml
-[build]
-target = "x86_64-unknown-none"
-
-[target.x86_64-unknown-none]
-rustflags = [
-  "-C",
-  "code-model=small",
-  "-C",
-  "link-args=-e entrypoint",
-]
-linker = "rust-lld"
-
-[profile.release]
-panic = "abort"
-
-[profile.dev]
-panic = "abort"
+Build the guest using [cargo-hyperlight](https://github.com/hyperlight-dev/cargo-hyperlight):
+
+```
+cargo install --locked cargo-hyperlight
+cargo hyperlight build
 ```
 
 For additional examples of using the Hyperlight host Rust library, see