x86: add option to display last exception records during register dumps

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Keir Fraser <keir@xensource.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/xen/arch/x86/x86_64/traps.c b/xen/arch/x86/x86_64/traps.c
index 992bf8d45c..79c7043146 100644
--- a/xen/arch/x86/x86_64/traps.c
+++ b/xen/arch/x86/x86_64/traps.c
@@ -112,6 +112,14 @@ void show_registers(struct cpu_user_regs *regs)
            "ss: %04x   cs: %04x\n",
            fault_regs.ds, fault_regs.es, fault_regs.fs,
            fault_regs.gs, fault_regs.ss, fault_regs.cs);
+
+    if ( this_cpu(ler_msr) && !guest_mode(regs) )
+    {
+        u64 from, to;
+        rdmsrl(this_cpu(ler_msr), from);
+        rdmsrl(this_cpu(ler_msr) + 1, to);
+        printk("ler: %016lx -> %016lx\n", from, to);
+    }
 }
 
 void show_page_walk(unsigned long addr)
@@ -302,7 +310,7 @@ static int write_stack_trampoline(
     return 34;
 }
 
-void __devinit percpu_traps_init(void)
+void __devinit subarch_percpu_traps_init(void)
 {
     char *stack_bottom, *stack;
     int   cpu = smp_processor_id();