Merge pull request project-oak#39 from efenniht/hfo2-17-api-cpu

Wrap mutable states of VCpu with SpinLock (partially done)

hfo2/src/abi.rs

@@ -16,6 +16,7 @@
 
 use crate::types::*;
 
+#[derive(Clone, Copy)]
 pub enum HfVCpuRunReturn {
     /// The vCPU has been preempted but still has work to do. If the scheduling
     /// quantum has not expired, the scheduler MUST call `hf_vcpu_run` on the

hfo2/src/addr.rs

@@ -19,9 +19,6 @@ use core::fmt;
 use crate::arch::*;
 use crate::types::*;
 
-// TODO: Refactor type names and remove this.
-#[allow(non_camel_case_types)]
-
 // TODO: Some codes (mm.rs, mpool.rs, page.rs and etc.) treats memory address
 // with primitive types (usually usize.) Refactor them to use `*addr_t` types.