fixup! [host/hypervisor_handler,host/mem/{layout,mgr},docs/paging] moved guest code to start at 0x0 instead of after paging sections

Author: danbugs

src/hyperlight_host/src/mem/layout.rs

@@ -313,7 +313,8 @@ impl SandboxMemoryLayout {
         heap_size: usize,
     ) -> Result<Self> {
         let guest_code_offset = 0x0;
-        let total_page_table_size = Self::get_total_page_table_size(cfg, code_size, stack_size, heap_size);
+        let total_page_table_size =
+            Self::get_total_page_table_size(cfg, code_size, stack_size, heap_size);
         let paging_sections_offset = guest_code_offset + round_up_to(code_size, PAGE_SIZE_USIZE);
         // The following offsets are to the fields of the PEB struct itself!
         let peb_offset = total_page_table_size + round_up_to(code_size, PAGE_SIZE_USIZE);

src/hyperlight_host/src/mem/mgr.rs

@@ -166,8 +166,7 @@ where
 
             for i in 0..512 {
                 let offset = self.layout.get_pd_offset() + (i * 8);
-                let val_to_write: u64 = (self.layout.get_pt_offset() as u64
-                    + (i * 4096) as u64)
+                let val_to_write: u64 = (self.layout.get_pt_offset() as u64 + (i * 4096) as u64)
                     | PAGE_PRESENT
                     | PAGE_RW;
                 shared_mem.write_u64(offset, val_to_write)?;