Enable microdroid console output with debug level or debug policy
With this CL, pvmfw will add kernel.print.devkmsg and console to
bootargs with hardcoded value from microdroid's debuggable bootconfig.
Test: manually start protected/unprotected VMs \
with various debug levels and debug policies.
Change-Id: I31600f0d337ff47edfb5cfea60f5e6a010c85ab5
diff --git a/virtualizationmanager/src/debug_config.rs b/virtualizationmanager/src/debug_config.rs
new file mode 100644
index 0000000..332df08
--- /dev/null
+++ b/virtualizationmanager/src/debug_config.rs
@@ -0,0 +1,39 @@
+// Copyright 2023, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Functions for AVF debug policy and debug level
+
+use android_system_virtualizationservice::aidl::android::system::virtualizationservice::{
+ VirtualMachineAppConfig::DebugLevel::DebugLevel
+};
+use std::fs::File;
+use std::io::Read;
+
+/// Get debug policy value in bool. It's true iff the value is explicitly set to <1>.
+fn get_debug_policy_bool(path: &'static str) -> Option<bool> {
+ if let Ok(mut file) = File::open(path) {
+ let mut log: [u8; 4] = Default::default();
+ file.read_exact(&mut log).map_err(|_| false).unwrap();
+ // DT spec uses big endian although Android is always little endian.
+ return Some(u32::from_be_bytes(log) == 1);
+ }
+ None
+}
+
+/// Get whether console output should be configred for VM to leave console and adb log.
+/// Caller should create pipe and prepare for receiving VM log with it.
+pub fn should_prepare_console_output(debug_level: DebugLevel) -> bool {
+ debug_level != DebugLevel::NONE
+ || get_debug_policy_bool("/proc/device-tree/avf/guest/common/log").unwrap_or_default()
+}