loader: reorganize imports

Export elf and bzimage specific features as `elf::<feature>` and
`bzimage::<feature>` respectively, to further simplify loader/mod.rs.

Signed-off-by: Alexandra Iordache <aghecen@amazon.com>

Author: Alexandra Iordache

src/loader/mod.rs

@@ -42,26 +42,22 @@ mod x86_64;
 #[cfg(target_arch = "aarch64")]
 mod aarch64;
 
-#[cfg(all(feature = "bzimage", any(target_arch = "x86", target_arch = "x86_64")))]
-pub use x86_64::bzimage::BzImage;
-#[cfg(all(feature = "bzimage", any(target_arch = "x86", target_arch = "x86_64")))]
-pub use x86_64::bzimage::Error as BzImageError;
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+pub use x86_64::*;
 
-#[cfg(all(feature = "elf", any(target_arch = "x86", target_arch = "x86_64")))]
-pub use x86_64::elf::Elf;
-#[cfg(all(feature = "elf", any(target_arch = "x86", target_arch = "x86_64")))]
-pub use x86_64::elf::Error as ElfError;
+#[cfg(target_arch = "aarch64")]
+pub use aarch64::*;
 
 #[derive(Debug, PartialEq)]
 /// Kernel loader errors.
 pub enum Error {
     /// Failed to load bzimage.
     #[cfg(all(feature = "bzimage", any(target_arch = "x86", target_arch = "x86_64")))]
-    Bzimage(BzImageError),
+    Bzimage(bzimage::Error),
 
     /// Failed to load elf image.
     #[cfg(all(feature = "elf", any(target_arch = "x86", target_arch = "x86_64")))]
-    Elf(ElfError),
+    Elf(elf::Error),
 
     /// Failed writing command line to guest memory.
     CommandLineCopy,
@@ -99,15 +95,15 @@ impl Display for Error {
 }
 
 #[cfg(all(feature = "elf", any(target_arch = "x86", target_arch = "x86_64")))]
-impl From<ElfError> for Error {
-    fn from(err: ElfError) -> Self {
+impl From<elf::Error> for Error {
+    fn from(err: elf::Error) -> Self {
         Error::Elf(err)
     }
 }
 
 #[cfg(all(feature = "bzimage", any(target_arch = "x86", target_arch = "x86_64")))]
-impl From<BzImageError> for Error {
-    fn from(err: BzImageError) -> Self {
+impl From<bzimage::Error> for Error {
+    fn from(err: bzimage::Error) -> Self {
         Error::Bzimage(err)
     }
 }

src/loader/x86_64/bzimage/mod.rs

@@ -86,7 +86,7 @@ impl KernelLoader for BzImage {
     /// let gm = GuestMemoryMmap::from_ranges(&[(GuestAddress(0x0), mem_size)]).unwrap();
     /// let mut kernel_image = vec![];
     /// kernel_image.extend_from_slice(include_bytes!("bzimage"));
-    /// assert!(BzImage::load(
+    /// assert!(bzimage::BzImage::load(
     ///     &gm,
     ///     Some(kernel_addr),
     ///     &mut Cursor::new(&kernel_image),

src/loader/x86_64/elf/mod.rs

@@ -150,7 +150,7 @@ impl KernelLoader for Elf {
     /// let gm = GuestMemoryMmap::from_ranges(&[(GuestAddress(0x0), mem_size)]).unwrap();
     /// let mut kernel_image = vec![];
     /// kernel_image.extend_from_slice(include_bytes!("test_elf.bin"));
-    /// assert!(Elf::load(
+    /// assert!(elf::Elf::load(
     ///     &gm,
     ///     Some(kernel_addr),
     ///     &mut Cursor::new(&kernel_image),