dom0 state dump

Since xenctx cannot (for obvious reasons) display the context of
dom0's vCPU-s, here are the beginnings of a console based mechanism to
achieve the same (useful if dom0 hangs with one or more de-scheduled
vCPU-s). The stack handling obviously needs improvement, but the
register context should come out fine in all cases.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/xen/common/keyhandler.c b/xen/common/keyhandler.c
index 9194273322..2acd17ae7b 100644
--- a/xen/common/keyhandler.c
+++ b/xen/common/keyhandler.c
@@ -127,6 +127,19 @@ static void dump_registers(unsigned char key, struct cpu_user_regs *regs)
     console_end_sync();
 }
 
+static void dump_dom0_registers(unsigned char key)
+{
+    struct vcpu *v;
+
+    if ( dom0 == NULL )
+        return;
+
+    printk("'%c' pressed -> dumping Dom0's registers\n", key);
+
+    for_each_vcpu ( dom0, v )
+        vcpu_show_execution_state(v);
+}
+
 static void halt_machine(unsigned char key, struct cpu_user_regs *regs)
 {
     printk("'%c' pressed -> rebooting machine\n", key);
@@ -312,6 +325,9 @@ void __init initialize_keytable(void)
         'P', perfc_reset,    "reset performance counters");
 #endif
 
+    register_keyhandler(
+        '0', dump_dom0_registers, "dump Dom0 registers");
+
     register_irq_keyhandler('%', do_debug_key,   "Trap to xendbg");
 }