libipl: Checking write flag before applying guard

Change: Adding checkWriteFlag, which will read the write flag in guard partition, this to see if the guard partition is not corrupt or not. If the write flag is set to 0x00 checkWriteFlag will return true and need to clear the guard records from the partition. Tested: Setting the write flag as 0x00, seeing that guard records are getting clear. Signed-off-by: Chirag Sharma <[email protected]>
open-power · May 29, 2022 · f74017c · f74017c
1 parent 3cafe26
commit f74017c
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/libipl/p10/ipl0.C b/libipl/p10/ipl0.C
@@ -291,6 +291,12 @@ static void process_guard_records()
 
 	openpower::guard::libguard_init(false);
 
+	if (openpower::guard::checkWriteFlag()) {
+		ipl_log(IPL_INFO, "Guard partition is corrupt");
+		openpower::guard::clearAll();
+		return;
+	}
+
 	auto records = openpower::guard::getAll();
 	if (records.size()) {
 		ipl_log(IPL_INFO, "Number of Records = %d\n",records.size());