Add a machine check entry stub for FRED.
Tested-by: Shan Kang <shan.kang@xxxxxxxxx>
Signed-off-by: Xin Li <xin3.li@xxxxxxxxx>
---
Changes since v5:
* Disallow #DB inside #MCE for robustness sake (Peter Zijlstra).
---
arch/x86/include/asm/fred.h | 1 +
arch/x86/kernel/cpu/mce/core.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/arch/x86/include/asm/fred.h b/arch/x86/include/asm/fred.h
index 2a7c47dfd733..f559dd9dc4f2 100644
--- a/arch/x86/include/asm/fred.h
+++ b/arch/x86/include/asm/fred.h
@@ -115,6 +115,7 @@ typedef DECLARE_FRED_HANDLER((*fred_handler));
DECLARE_FRED_HANDLER(fred_exc_nmi);
DECLARE_FRED_HANDLER(fred_exc_debug);
DECLARE_FRED_HANDLER(fred_exc_page_fault);
+DECLARE_FRED_HANDLER(fred_exc_machine_check);
#endif /* __ASSEMBLY__ */
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index b8ad5a5b4026..98456e20f155 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -52,6 +52,7 @@
#include <asm/mce.h>
#include <asm/msr.h>
#include <asm/reboot.h>
+#include <asm/fred.h>
#include "internal.h"
@@ -2118,6 +2119,20 @@ DEFINE_IDTENTRY_MCE_USER(exc_machine_check)
exc_machine_check_user(regs);
local_db_restore(dr7);
}
+
+#ifdef CONFIG_X86_FRED
+DEFINE_FRED_HANDLER(fred_exc_machine_check)
+{
+ unsigned long dr7;
+
+ dr7 = local_db_save();
+ if (user_mode(regs))
+ exc_machine_check_user(regs);
+ else
+ exc_machine_check_kernel(regs);
+ local_db_restore(dr7);
+}
+#endif
#else
/* 32bit unified entry point */
DEFINE_IDTENTRY_RAW(exc_machine_check)
--
2.34.1
