Introduces a separate KVM error variant of HyperlightError.

Fixes a common build error which occurs when the version of vmm-sys-util
crate does not match between mshv/kvm.

VmmSysError variant is now solely used for our signal
registration, and is not used by mshv nor kvm code.

Signed-off-by: Ludvig Liljenberg <[email protected]>

Author: ludfjig

Cargo.lock

@@ -40,7 +40,7 @@ tracing-log = "0.2.0"
 tracing-core = "0.1.34"
 hyperlight-common = { workspace = true, default-features = true, features = [ "std" ] }
 hyperlight-guest-tracing = { workspace = true, default-features = true, optional = true }
-vmm-sys-util = "0.14.0"
+vmm-sys-util = "0.15.0"
 crossbeam-channel = "0.5.15"
 thiserror = "2.0.12"
 chrono = { version = "0.4", optional = true }

src/hyperlight_host/Cargo.toml

@@ -138,6 +138,11 @@ pub enum HyperlightError {
     #[error("Conversion of str data to json failed")]
     JsonConversionFailure(#[from] serde_json::Error),
 
+    /// KVM Error Occurred
+    #[error("KVM Error {0:?}")]
+    #[cfg(kvm)]
+    KVMError(#[from] kvm_ioctls::Error),
+
     /// An attempt to get a lock from a Mutex failed.
     #[error("Unable to lock resource")]
     LockAttemptFailed(String),

src/hyperlight_host/src/error.rs

@@ -794,9 +794,7 @@ impl Hypervisor for HypervLinuxDriver {
             .load(Ordering::Relaxed)
             || debug_interrupt
         {
-            Err(MshvError::Errno(vmm_sys_util::errno::Error::new(
-                libc::EINTR,
-            )))
+            Err(MshvError::from(libc::EINTR))
         } else {
             #[cfg(feature = "trace_guest")]
             if self.trace_info.guest_start_epoch.is_none() {