arch, vmm: Run KVM specific unit tests with kvm feature guard

Signed-off-by: Muminul Islam <muislam@microsoft.com>

arch/src/x86_64/interrupts.rs

@@ -82,6 +82,7 @@ pub fn set_lint(vcpu: &Arc<dyn hypervisor::Vcpu>) -> Result<()> {
 }
 
 #[cfg(test)]
+#[cfg(feature = "kvm")]
 mod tests {
 
     extern crate rand;

vmm/src/vm.rs

@@ -2222,7 +2222,7 @@ mod tests {
     }
 }
 
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(feature = "kvm", target_arch = "x86_64"))]
 #[test]
 pub fn test_vm() {
     use hypervisor::VmExit;