add allow dead_code and process Result in KVM

src/kvm.rs

@@ -228,7 +228,7 @@ pub fn init_user_pagetable(proc: &Proc) -> Option<NonNull<PageTable>> {
         PAGESIZE,
         PteFlag::PTE_READ | PteFlag::PTE_EXEC,
     ) {
-        unmap_free(page_table, 0);
+        unmap_free(page_table, 0).unwrap();
         return None;
     };
 
@@ -240,8 +240,8 @@ pub fn init_user_pagetable(proc: &Proc) -> Option<NonNull<PageTable>> {
         PAGESIZE,
         PteFlag::PTE_READ | PteFlag::PTE_WRITE,
     ) {
-        unmap_pages(page_table, VirtAddr::new(TRAMPOLINE), 1, false);
-        unmap_free(page_table, 0);
+        unmap_pages(page_table, VirtAddr::new(TRAMPOLINE), 1, false).unwrap();
+        unmap_free(page_table, 0).unwrap();
         return None;
     };
     Some(page_table_ptr)

src/riscv.rs

@@ -8,12 +8,14 @@ pub const MAXVA: u64 = 1 << (9 + 9 + 9 + 12 - 1);
 // Maximum Interrupt Count
 pub const MAX_INTERRUPT: u64 = 1024;
 
+#[allow(dead_code)]
 pub enum Interrupt {
     SupervisorSoftware = 1,
     SupervisorTimer = 5,
     SupervisorExternal = 9,
 }
 
+#[allow(dead_code)]
 pub enum Exception {
     InstructionAddressMisaligned = 0,
     InstructionAccessFault = 1,

src/syscall.rs

@@ -11,6 +11,7 @@ lazy_static! {
     static ref SYSCALLS: [SyscallEntry; SYSCALL_NUM] = [syscall_write];
 }
 
+#[allow(dead_code)]
 enum ArgIndex {
     A0,
     A1,

src/virtio/block.rs

@@ -93,6 +93,7 @@ pub struct BlockRequest {
 
 #[repr(u32)]
 #[derive(Debug)]
+#[allow(dead_code)]
 pub enum RequestType {
     In = 0,
     Out = 1,

src/virtio/mod.rs

@@ -3,6 +3,7 @@ pub mod header;
 pub mod queue;
 
 #[derive(Debug)]
+#[allow(dead_code)]
 pub enum Error {
     /// Device status not OK
     HeaderInitError,

src/vm/page_table.rs

@@ -25,6 +25,7 @@ impl PageTableIndex {
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+#[allow(dead_code)]
 pub enum PageTableLevel {
     /// Level 0, table of page
     Zero = 0,