Previously we can only get a simple string "Triple fault" in qemu
log. Add detailed message for the two reasons to describe why qemu
has to reset the guest.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
---
 target/i386/helper.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/target/i386/helper.c b/target/i386/helper.c
index 70be53e2c3..0c7fd32491 100644
--- a/target/i386/helper.c
+++ b/target/i386/helper.c
@@ -857,6 +857,8 @@ static void do_inject_x86_mce(CPUState *cs, run_on_cpu_data data)
     X86CPU *cpu = X86_CPU(cs);
     CPUX86State *cenv = &cpu->env;
     uint64_t *banks = cenv->mce_banks + 4 * params->bank;
+    char msg[64];
+    bool need_reset = false;
 
     cpu_synchronize_state(cs);
 
@@ -894,16 +896,25 @@ static void do_inject_x86_mce(CPUState *cs, run_on_cpu_data data)
             return;
         }
 
-        if ((cenv->mcg_status & MCG_STATUS_MCIP) ||
-            !(cenv->cr[4] & CR4_MCE_MASK)) {
-            monitor_printf(params->mon,
-                           "CPU %d: Previous MCE still in progress, raising"
-                           " triple fault\n",
-                           cs->cpu_index);
-            qemu_log_mask(CPU_LOG_RESET, "Triple fault\n");
+        if (cenv->mcg_status & MCG_STATUS_MCIP) {
+            need_reset = true;
+            snprintf(msg, sizeof(msg), "CPU %d: Previous MCE still in progress,"
+                     " raising triple fault", cs->cpu_index);
+        }
+
+        if (!(cenv->cr[4] & CR4_MCE_MASK)) {
+            need_reset = true;
+            snprintf(msg, sizeof(msg), "CPU %d: MCE capability is not enabled,"
+                     " raising triple fault", cs->cpu_index);
+        }
+
+        if (need_reset) {
+            monitor_printf(params->mon, "%s", msg);
+            qemu_log_mask(CPU_LOG_RESET, "%s\n", msg);
             qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
             return;
         }
+
         if (banks[1] & MCI_STATUS_VAL) {
             params->status |= MCI_STATUS_OVER;
         }
-- 
2.11.0