[xen staging] x86: log non-responding CPUs in fatal_trap()

[patchbot@xxxxxxx]

commit 59ec934d538c24265e29667aac5a6d69e31eef0a
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Jul 19 08:36:10 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 19 08:36:10 2022 +0200

    x86: log non-responding CPUs in fatal_trap()
    
    This eases recognizing that something odd is going on.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/traps.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index cabebf4f5b..b713ef7e77 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -845,6 +845,9 @@ void fatal_trap(const struct cpu_user_regs *regs, bool 
show_remote)
                     msecs = 10;
                 }
             }
+            if ( pending )
+                printk("Non-responding CPUs: {%*pbl}\n",
+                       CPUMASK_PR(&show_state_mask));
         }
     }
 
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