Removes requirement of specific environment variables to be set during tests. (#108)

Signed-off-by: Ludvig Liljenberg <lliljenberg@microsoft.com>

Author: ludfjig

.devcontainer/devcontainer.json

@@ -9,7 +9,6 @@
   // Environment for the container also used by the `postCreateCommand`
   "containerEnv": {
     "DEVICE": "/dev/kvm",
-    "KVM_SHOULD_BE_PRESENT": "true",
     "REMOTE_USER": "vscode",
     "REMOTE_GROUP": "vscode"
   },

src/hyperlight_host/src/hypervisor/hyperv_linux.rs

@@ -371,65 +371,11 @@ impl Drop for HypervLinuxDriver {
     }
 }
 
-#[cfg(test)]
-pub(crate) mod test_cfg {
-    use once_cell::sync::Lazy;
-    use serde::Deserialize;
-
-    pub(crate) static TEST_CONFIG: Lazy<TestConfig> =
-        Lazy::new(|| match envy::from_env::<TestConfig>() {
-            Ok(config) => config,
-            Err(err) => panic!("error parsing config from env: {}", err),
-        });
-    pub(crate) static SHOULD_RUN_TEST: Lazy<bool> = Lazy::new(is_hyperv_present);
-
-    fn is_hyperv_present() -> bool {
-        println!(
-            "HYPERV_SHOULD_BE_PRESENT is {}",
-            TEST_CONFIG.hyperv_should_be_present
-        );
-        let is_present = super::is_hypervisor_present();
-        if (is_present && !TEST_CONFIG.hyperv_should_be_present)
-            || (!is_present && TEST_CONFIG.hyperv_should_be_present)
-        {
-            panic!(
-                "WARNING Hyper-V is present returned  {}, should be present is: {}",
-                is_present, TEST_CONFIG.hyperv_should_be_present
-            );
-        }
-        is_present
-    }
-
-    fn hyperv_should_be_present_default() -> bool {
-        false
-    }
-
-    #[derive(Deserialize, Debug)]
-    pub(crate) struct TestConfig {
-        #[serde(default = "hyperv_should_be_present_default")]
-        // Set env var HYPERV_SHOULD_BE_PRESENT to require hyperv to be present for the tests.
-        pub(crate) hyperv_should_be_present: bool,
-    }
-
-    #[macro_export]
-    macro_rules! should_run_hyperv_linux_test {
-        () => {{
-            if !(*SHOULD_RUN_TEST) {
-                println! {"Not Running Test SHOULD_RUN_TEST is false"}
-                return;
-            }
-            println! {"Running Test SHOULD_RUN_TEST is true"}
-        }};
-    }
-}
-
 #[cfg(test)]
 mod tests {
-    use super::test_cfg::{SHOULD_RUN_TEST, TEST_CONFIG};
     use super::*;
     use crate::mem::memory_region::MemoryRegionVecBuilder;
     use crate::mem::shared_mem::{ExclusiveSharedMemory, SharedMemory};
-    use crate::should_run_hyperv_linux_test;
 
     #[rustfmt::skip]
     const CODE: [u8; 12] = [
@@ -460,15 +406,11 @@ mod tests {
         Ok(Box::new(shared_mem))
     }
 
-    #[test]
-    fn is_hypervisor_present() {
-        let result = super::is_hypervisor_present();
-        assert_eq!(result, TEST_CONFIG.hyperv_should_be_present);
-    }
-
     #[test]
     fn create_driver() {
-        should_run_hyperv_linux_test!();
+        if !super::is_hypervisor_present() {
+            return;
+        }
         const MEM_SIZE: usize = 0x3000;
         let gm = shared_mem_with_code(CODE.as_slice(), MEM_SIZE, 0).unwrap();
         let rsp_ptr = GuestPtr::try_from(0).unwrap();

src/hyperlight_host/src/hypervisor/kvm.rs

@@ -328,71 +328,21 @@ impl Hypervisor for KVMDriver {
         &self.mem_regions
     }
 }
-
-#[cfg(test)]
-pub(crate) mod test_cfg {
-    use once_cell::sync::Lazy;
-    use serde::Deserialize;
-
-    pub(crate) static TEST_CONFIG: Lazy<TestConfig> =
-        Lazy::new(|| match envy::from_env::<TestConfig>() {
-            Ok(config) => config,
-            Err(err) => panic!("error parsing config from env: {}", err),
-        });
-    pub(crate) static SHOULD_RUN_TEST: Lazy<bool> = Lazy::new(is_kvm_present);
-
-    fn is_kvm_present() -> bool {
-        println!(
-            "KVM_SHOULD_BE_PRESENT is {}",
-            TEST_CONFIG.kvm_should_be_present
-        );
-        let is_present = super::is_hypervisor_present();
-        if (is_present && !TEST_CONFIG.kvm_should_be_present)
-            || (!is_present && TEST_CONFIG.kvm_should_be_present)
-        {
-            println!(
-                "WARNING: KVM is-present returned {}, should be present is: {}",
-                is_present, TEST_CONFIG.kvm_should_be_present
-            );
-        }
-        is_present
-    }
-
-    fn kvm_should_be_present_default() -> bool {
-        false
-    }
-
-    #[derive(Deserialize, Debug)]
-    pub(crate) struct TestConfig {
-        #[serde(default = "kvm_should_be_present_default")]
-        // Set env var KVM_SHOULD_BE_PRESENT to require kvm to be present for the tests.
-        pub(crate) kvm_should_be_present: bool,
-    }
-
-    #[macro_export]
-    macro_rules! should_run_kvm_linux_test {
-        () => {{
-            if !(*$crate::hypervisor::kvm::test_cfg::SHOULD_RUN_TEST) {
-                println! {"Not Running KVM Test - SHOULD_RUN_TEST is false"}
-                return;
-            }
-            println! {"Running Test - SHOULD_RUN_TEST is true"}
-        }};
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use std::sync::{Arc, Mutex};
 
     use crate::hypervisor::handlers::{MemAccessHandler, OutBHandler};
     use crate::hypervisor::tests::test_initialise;
-    use crate::{should_run_kvm_linux_test, Result};
+    use crate::Result;
 
     #[test]
     fn test_init() {
-        should_run_kvm_linux_test!();
-        let outb_handler = {
+        if !super::is_hypervisor_present() {
+            return;
+        }
+
+        let outb_handler: Arc<Mutex<OutBHandler>> = {
             let func: Box<dyn FnMut(u16, u64) -> Result<()> + Send> =
                 Box::new(|_, _| -> Result<()> { Ok(()) });
             Arc::new(Mutex::new(OutBHandler::from(func)))

src/hyperlight_host/src/sandbox/mod.rs

@@ -158,12 +158,6 @@ mod tests {
     use crossbeam_queue::ArrayQueue;
     use hyperlight_testing::simple_guest_as_string;
 
-    #[cfg(target_os = "linux")]
-    use super::is_hypervisor_present;
-    #[cfg(mshv)]
-    use crate::hypervisor::hyperv_linux::test_cfg::TEST_CONFIG as HYPERV_TEST_CONFIG;
-    #[cfg(kvm)]
-    use crate::hypervisor::kvm::test_cfg::TEST_CONFIG as KVM_TEST_CONFIG;
     use crate::sandbox::uninitialized::GuestBinary;
     use crate::sandbox_state::sandbox::EvolvableSandbox;
     use crate::sandbox_state::transition::Noop;
@@ -172,29 +166,18 @@ mod tests {
     #[test]
     // TODO: add support for testing on WHP
     #[cfg(target_os = "linux")]
-    fn test_is_hypervisor_present() {
-        // TODO: Handle requiring a stable API
+    fn is_hypervisor_present() {
+        use std::path::Path;
+
         cfg_if::cfg_if! {
             if #[cfg(all(kvm, mshv))] {
-                if KVM_TEST_CONFIG.kvm_should_be_present || HYPERV_TEST_CONFIG.hyperv_should_be_present {
-                    assert!(is_hypervisor_present());
-                } else {
-                    assert!(!is_hypervisor_present());
-                }
+                assert_eq!(Path::new("/dev/kvm").exists() || Path::new("/dev/mshv").exists(), super::is_hypervisor_present());
             } else if #[cfg(kvm)] {
-                if KVM_TEST_CONFIG.kvm_should_be_present {
-                    assert!(is_hypervisor_present());
-                } else {
-                    assert!(!is_hypervisor_present());
-                }
+                assert_eq!(Path::new("/dev/kvm").exists(), super::is_hypervisor_present());
             } else if #[cfg(mshv)] {
-                if HYPERV_TEST_CONFIG.hyperv_should_be_present {
-                    assert!(is_hypervisor_present());
-                } else {
-                    assert!(!is_hypervisor_present());
-                }
+                assert_eq!(Path::new("/dev/mshv").exists(), super::is_hypervisor_present());
             } else {
-                assert!(!is_hypervisor_present());
+                assert!(!super::is_hypervisor_present());
             }
         }
     }