diff --git a/Makefile b/Makefile
index 4cd2c1be..039578e3 100644
--- a/Makefile
+++ b/Makefile
@@ -104,3 +104,6 @@ baremetal-test:
 baremetal-test-rv64:
 	@make -C zCore baremetal-test-rv64 arch=riscv64 mode=release linux=1 ROOTPROC=$(ROOTPROC) | tee -a stdout-baremetal-test-rv64 | tee stdout-rv64
 
+## JUST FOR TEST, delete it later
+run:
+	cargo run -p zircon-loader -- prebuilt/zircon/x64 LOG=warn:TERM=xterm-256color:console.shell=true:virtcon.disable=true
\ No newline at end of file
diff --git a/zircon-loader/Cargo.toml b/zircon-loader/Cargo.toml
index eeb1f1f8..a4c809ec 100644
--- a/zircon-loader/Cargo.toml
+++ b/zircon-loader/Cargo.toml
@@ -20,4 +20,5 @@ async-std = { version = "1.9", features = ["attributes"], optional = true }
 
 [features]
 default = ["std"]
-std = ["env_logger", "structopt", "async-std", "kernel-hal-unix", "zircon-object/aspace-separate"]
+std = ["env_logger", "structopt", "async-std", "kernel-hal-unix", 
+        "zircon-object/aspace-separate", "zircon-syscall/std"]
diff --git a/zircon-syscall/Cargo.toml b/zircon-syscall/Cargo.toml
index 86fde9de..6699d22f 100644
--- a/zircon-syscall/Cargo.toml
+++ b/zircon-syscall/Cargo.toml
@@ -8,7 +8,11 @@ description = "Zircon syscalls implementation"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
-#hypervisor = ["zircon-object/hypervisor"]
+# hypervisor = ["zircon-object/hypervisor"]
+default = []
+deny-page-fault = []
+std = ["deny-page-fault"]
+
 
 [dependencies]
 log = "0.4"
@@ -18,3 +22,4 @@ numeric-enum-macro = "0.2"
 zircon-object = { path = "../zircon-object" }
 kernel-hal = { path = "../kernel-hal" }
 futures = { version = "0.3", default-features = false, features = ["alloc", "async-await"] }
+
diff --git a/zircon-syscall/src/vmar.rs b/zircon-syscall/src/vmar.rs
index af700900..0251f99a 100644
--- a/zircon-syscall/src/vmar.rs
+++ b/zircon-syscall/src/vmar.rs
@@ -128,12 +128,16 @@ impl Syscall<'_> {
         mapping_flags.set(MMUFlags::READ, options.contains(VmOptions::PERM_READ));
         mapping_flags.set(MMUFlags::WRITE, options.contains(VmOptions::PERM_WRITE));
         mapping_flags.set(MMUFlags::EXECUTE, options.contains(VmOptions::PERM_EXECUTE));
-        info!(
-            "mmuflags: {:?}, is_specific {:?}",
-            mapping_flags, is_specific
-        );
         let overwrite = options.contains(VmOptions::SPECIFIC_OVERWRITE);
+        #[cfg(feature = "deny-page-fault")]
+        let map_range = true;
+        #[cfg(not(feature = "deny-page-fault"))]
         let map_range = options.contains(VmOptions::MAP_RANGE);
+
+        info!(
+            "mmuflags: {:?}, is_specific {:?}, overwrite {:?}, map_range {:?}",
+            mapping_flags, is_specific, overwrite, map_range
+        );
         if map_range && overwrite {
             return Err(ZxError::INVALID_ARGS);
         }