diff --git a/ostd/src/boot/kcmdline.rs b/kernel/src/kcmdline.rs
similarity index 98%
rename from ostd/src/boot/kcmdline.rs
rename to kernel/src/kcmdline.rs
index 517610b87..a4adaa3a7 100644
--- a/ostd/src/boot/kcmdline.rs
+++ b/kernel/src/kcmdline.rs
@@ -18,8 +18,6 @@ use alloc::{
     vec::Vec,
 };
 
-use crate::early_println;
-
 #[derive(PartialEq, Debug)]
 struct InitprocArgs {
     path: Option<String>,
@@ -116,7 +114,7 @@ impl From<&str> for KCmdlineArg {
                 1 => (arg_pattern[0], None),
                 2 => (arg_pattern[0], Some(arg_pattern[1])),
                 _ => {
-                    early_println!(
+                    log::warn!(
                         "[KCmdline] Unable to parse kernel argument {}, skip for now",
                         arg
                     );
@@ -129,7 +127,7 @@ impl From<&str> for KCmdlineArg {
                 1 => (None, entry_pattern[0]),
                 2 => (Some(entry_pattern[0]), entry_pattern[1]),
                 _ => {
-                    early_println!(
+                    log::warn!(
                         "[KCmdline] Unable to parse entry {} in argument {}, skip for now",
                         entry,
                         arg
diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
index c7f70df40..7e4698036 100644
--- a/kernel/src/lib.rs
+++ b/kernel/src/lib.rs
@@ -30,6 +30,7 @@
 #![feature(trait_upcasting)]
 #![register_tool(component_access_control)]
 
+use kcmdline::KCmdlineArg;
 use ostd::{
     arch::qemu::{exit_qemu, QemuExitCode},
     boot::boot_info,
@@ -59,6 +60,7 @@ pub mod error;
 pub mod events;
 pub mod fs;
 pub mod ipc;
+pub mod kcmdline;
 pub mod net;
 pub mod prelude;
 mod process;
@@ -141,7 +143,7 @@ fn init_thread() {
 
     print_banner();
 
-    let karg = &boot_info().kernel_cmdline;
+    let karg: KCmdlineArg = boot_info().kernel_cmdline.as_str().into();
 
     let initproc = Process::spawn_user_process(
         karg.get_initproc_path().unwrap(),
diff --git a/ostd/src/arch/x86/boot/multiboot/mod.rs b/ostd/src/arch/x86/boot/multiboot/mod.rs
index 1d43b25ef..1523413a3 100644
--- a/ostd/src/arch/x86/boot/multiboot/mod.rs
+++ b/ostd/src/arch/x86/boot/multiboot/mod.rs
@@ -40,14 +40,10 @@ fn parse_kernel_commandline(mb1_info: &MultibootLegacyInfo) -> &str {
     if mb1_info.cmdline != 0 {
         // SAFETY: the command line is C-style zero-terminated string.
         unsafe {
-            let cstr = paddr_to_vaddr(mb1_info.cmdline as usize) as *const u8;
-            let mut len = 0;
-            while cstr.add(len).read() != 0 {
-                len += 1;
-            }
+            let cstr = paddr_to_vaddr(mb1_info.cmdline as usize) as *const i8;
+            let cstr = core::ffi::CStr::from_ptr(cstr);
 
-            cmdline = core::str::from_utf8(core::slice::from_raw_parts(cstr, len))
-                .expect("cmdline is not a utf-8 string");
+            cmdline = cstr.to_str().unwrap();
         }
     }
     cmdline
diff --git a/ostd/src/boot/mod.rs b/ostd/src/boot/mod.rs
index d48ff12ce..346111643 100644
--- a/ostd/src/boot/mod.rs
+++ b/ostd/src/boot/mod.rs
@@ -6,7 +6,6 @@
 //!  2. the routine booting into the actual kernel;
 //!  3. the routine booting the other processors in the SMP context.
 
-pub mod kcmdline;
 pub mod memory_region;
 pub mod smp;
 
@@ -15,7 +14,6 @@ use alloc::{
     vec::Vec,
 };
 
-use kcmdline::KCmdlineArg;
 use memory_region::{MemoryRegion, MemoryRegionArray};
 use spin::Once;
 
@@ -24,7 +22,7 @@ pub struct BootInfo {
     /// The name of the bootloader.
     pub bootloader_name: String,
     /// The kernel command line arguments.
-    pub kernel_cmdline: KCmdlineArg,
+    pub kernel_cmdline: String,
     /// The initial ramfs raw bytes.
     pub initramfs: Option<&'static [u8]>,
     /// The framebuffer arguments.
@@ -100,7 +98,7 @@ pub(crate) fn init() {
 
     INFO.call_once(|| BootInfo {
         bootloader_name: boot_time_info.bootloader_name.to_string(),
-        kernel_cmdline: boot_time_info.kernel_cmdline.into(),
+        kernel_cmdline: boot_time_info.kernel_cmdline.to_string(),
         initramfs: boot_time_info.initramfs,
         framebuffer_arg: boot_time_info.framebuffer_arg,
         memory_regions: boot_time_info.memory_regions.to_vec(),
diff --git a/ostd/src/logger.rs b/ostd/src/logger.rs
index 066b3d341..a941e2dc2 100644
--- a/ostd/src/logger.rs
+++ b/ostd/src/logger.rs
@@ -12,7 +12,7 @@ use core::str::FromStr;
 use log::{LevelFilter, Metadata, Record};
 use spin::Once;
 
-use crate::boot::{boot_info, kcmdline::ModuleArg};
+use crate::boot::BOOT_TIME_INFO;
 
 static LOGGER: Logger = Logger::new();
 
@@ -82,16 +82,15 @@ pub(crate) fn init() {
 }
 
 fn get_log_level() -> Option<LevelFilter> {
-    let module_args = boot_info().kernel_cmdline.get_module_args("ostd")?;
+    let kcmdline = BOOT_TIME_INFO.get().unwrap().kernel_cmdline;
+
+    // Although OSTD is agnostic of the parsing of the kernel command line,
+    // the logger assumes that it follows the Linux kernel command line format.
+    // We search for the `ostd.log_level=ARGUMENT` pattern in string.
+    let value = kcmdline
+        .split(' ')
+        .find(|arg| arg.starts_with("ostd.log_level="))
+        .map(|arg| arg.split('=').last().unwrap_or_default())?;
 
-    let value = {
-        let value = module_args.iter().find_map(|arg| match arg {
-            ModuleArg::KeyVal(name, value) if name.as_bytes() == "log_level".as_bytes() => {
-                Some(value)
-            }
-            _ => None,
-        })?;
-        value.as_c_str().to_str().ok()?
-    };
     LevelFilter::from_str(value).ok()
 }