Add a feature named enable-console-log.

This feature can be enable to print log messages to console in addition to storing them in the log buffer. Enable this feature by default for debug builds. Signed-off-by: Vasant Karasulli <[email protected]>
coconut-svsm · Jul 4, 2023 · 97c017b · 97c017b
1 parent cf66d38
commit 97c017b
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Showing 6 changed files with 51 additions and 26 deletions.
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
@@ -31,7 +31,7 @@ jobs:
       # ld to work, so build all the objects without performing the
       # final linking step.
       - name: Build
-        run: make FEATURES="default,enable-gdb" stage1/stage1.o stage1/reset.o
+        run: make FEATURES="default-debug,enable-gdb" stage1/stage1.o stage1/reset.o
 
       - name: Run tests
         run: make test

diff --git a/Cargo.toml b/Cargo.toml
@@ -28,6 +28,8 @@ packit = { git = "https://github.com/coconut-svsm/packit", version = "0.1.0" }
 cc = "1.0.46"
 
 [features]
-default = ["enable-stacktrace"]
+default-release = ["enable-stacktrace"]
+default-debug = ["enable-stacktrace", "enable-console-log"]
 enable-stacktrace = []
 enable-gdb = []
+enable-console-log = []
diff --git a/Makefile b/Makefile
@@ -1,11 +1,12 @@
-FEATURES ?= "default"
-CARGO_ARGS = --features ${FEATURES}
-
 ifdef RELEASE
 TARGET_PATH="release"
+FEATURES ?= "default-release"
+CARGO_ARGS = --features ${FEATURES}
 CARGO_ARGS += --release
 else
 TARGET_PATH="debug"
+FEATURES ?= "default-debug"
+CARGO_ARGS = --features ${FEATURES}
 endif
 
 

diff --git a/src/line_buffer.rs b/src/line_buffer.rs
@@ -1,3 +1,6 @@
+#[cfg(feature = "enable-console-log")]
+use crate::console::_print;
+
 use crate::cpu::percpu::this_cpu_mut;
 use crate::log_buffer::LB;
 use crate::utils::immut_after_init::ImmutAfterInitCell;
@@ -67,32 +70,42 @@ impl log::Log for BufferLogger {
     }
 
     fn log(&self, record: &log::Record) {
-        let component: &'static str = &self.component;
+        let comp: &'static str = &self.component;
         let line_buf: &mut LineBuffer = this_cpu_mut().get_line_buffer();
         // Log format/detail depends on the level.
+        let rec_args = record.args();
+        let lvl = record.metadata().level().as_str();
+        let target = record.metadata().target();
         match record.metadata().level() {
-            log::Level::Error | log::Level::Warn => write!(
-                line_buf,
-                "[{}] {}: {}\n",
-                component,
-                record.metadata().level().as_str(),
-                record.args()
-            )
-            .expect("write error"),
+            log::Level::Error | log::Level::Warn => {
+                line_buf
+                    .write_fmt(format_args!("[{}] {}: {}\n", comp, lvl, rec_args))
+                    .unwrap();
+                #[cfg(feature = "enable-console-log")]
+                {
+                    _print(format_args!("[{}] {}: {}\n", comp, lvl, rec_args));
+                }
+            }
 
             log::Level::Info => {
-                write!(line_buf, "[{}] {}\n", component, record.args()).expect("write error")
+                line_buf
+                    .write_fmt(format_args!("[{}] {}\n", comp, rec_args))
+                    .unwrap();
+                #[cfg(feature = "enable-console-log")]
+                {
+                    _print(format_args!("[{}] {}\n", comp, rec_args));
+                }
             }
 
-            log::Level::Debug | log::Level::Trace => write!(
-                line_buf,
-                "[{}/{}] {} {}\n",
-                component,
-                record.metadata().target(),
-                record.metadata().level().as_str(),
-                record.args()
-            )
-            .expect("write error"),
+            log::Level::Debug | log::Level::Trace => {
+                line_buf
+                    .write_fmt(format_args!("[{}/{}] {} {}\n", comp, target, lvl, rec_args))
+                    .unwrap();
+                #[cfg(feature = "enable-console-log")]
+                {
+                    _print(format_args!("[{}/{}] {} {}\n", comp, target, lvl, rec_args));
+                }
+            }
         }
     }
 

diff --git a/src/stage2.rs b/src/stage2.rs
@@ -104,7 +104,12 @@ fn setup_env() {
     unsafe {
         WRITER.lock().set(&mut CONSOLE_SERIAL);
     }
-    init_console();
+
+    #[cfg(feature = "enable-console-log")]
+    {
+        init_console();
+    }
+
     init_log_buffer();
     if let Err(_) = install_buffer_logger("Stage2") {
         panic!("log buffer installation error")

diff --git a/src/svsm.rs b/src/svsm.rs
@@ -390,7 +390,11 @@ pub extern "C" fn svsm_start(li: &KernelLaunchInfo, mi: &MigrateInfo) {
     if let Err(_) = install_buffer_logger("SVSM") {
         panic!("log buffer installation error")
     }
-    init_console();
+
+    #[cfg(feature = "enable-console-log")]
+    {
+        init_console();
+    }
 
     log::info!("COCONUT Secure Virtual Machine Service Module (SVSM)");