Fix typos and add comments

Signed-off-by: Joe Richey <joerichey@google.com>

Author: josephlr

layout.ld

@@ -32,7 +32,7 @@ SECTIONS
 		bss_size = . - bss_start;
 	}
 
-	/* Our stack grows down and is page-algined. TODO: Add stack guard pages. */
+	/* Our stack grows down and is page-aligned. TODO: Add stack guard pages. */
 	.stack (NOLOAD) : ALIGN(4K) { . += 64K; }
 	stack_start = .;
 	/* ram32.s only maps the first 2 MiB, and that must include the stack.    */

src/pvh.rs

@@ -67,6 +67,8 @@ const XEN_ELFNOTE_PHYS32_ENTRY: u32 = 18;
 type Name = [u8; 4];
 type Desc = unsafe extern "C" fn();
 
+// We make sure our ELF Note has an alignment of 4 for maximum compatibility.
+// Some software (QEMU) calculates padding incorectly if alignment != 4.
 #[repr(C, packed(4))]
 struct Note {
     name_size: u32,