Remove unused error mapping and add SEV C-Bit debug log

Eliminates an obsolete error mapping function to simplify error handling.
Adds debug logging for SEV C-Bit mask and page table root to aid in
diagnosis and validation of early memory management initialization.

Author: luodeb

modules/axmm/src/lib.rs

@@ -13,27 +13,15 @@ pub mod backend;
 pub use self::aspace::AddrSpace;
 pub use self::backend::Backend;
 
-use axerrno::{AxError, AxResult};
+use axerrno::AxResult;
 use axhal::mem::{MemRegionFlags, phys_to_virt};
 use axhal::paging::MappingFlags;
 use kspin::SpinNoIrq;
 use lazyinit::LazyInit;
 use memory_addr::{MemoryAddr, PhysAddr, VirtAddr, va};
-use memory_set::MappingError;
 
 static KERNEL_ASPACE: LazyInit<SpinNoIrq<AddrSpace>> = LazyInit::new();
 
-fn mapping_err_to_ax_err(err: MappingError) -> AxError {
-    if !matches!(err, MappingError::AlreadyExists) {
-        warn!("Mapping error: {err:?}");
-    }
-    match err {
-        MappingError::InvalidParam => AxError::InvalidInput,
-        MappingError::AlreadyExists => AxError::AlreadyExists,
-        MappingError::BadState => AxError::BadState,
-    }
-}
-
 fn reg_flag_to_map_flag(f: MemRegionFlags) -> MappingFlags {
     let mut ret = MappingFlags::empty();
     if f.contains(MemRegionFlags::READ) {
@@ -116,6 +104,7 @@ pub fn init_memory_management() {
     KERNEL_ASPACE.init_once(SpinNoIrq::new(kernel_aspace));
     let mut root = kernel_page_table_root();
     let cbit_mask = sev_cbit_mask();
+    debug!("SEV C-Bit mask = {:#x}, ROOT = {:#x}", cbit_mask, root);
     if cbit_mask != 0 {
         root = PhysAddr::from(root.as_usize() | cbit_mask);
     }