[xen staging] x86/traps: Make nmi_show_execution_state() more useful

[patchbot@xxxxxxx]

commit 0f2611c524385f7bffeee67635a488a5a29b6ba4
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Aug 12 18:25:55 2022 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Aug 17 12:50:48 2022 +0100

    x86/traps: Make nmi_show_execution_state() more useful
    
     * Always emit current.  It's critically important.
     * Do not render (0000000000000000) for the symbol in guest context.  It's
       just line-noise.  Instead, explicitly identify which Xen vs guest 
context.
     * Try to tabulate the data, because there is often lots of it.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/traps.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index b713ef7e77..7207390118 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -767,9 +767,13 @@ static int cf_check nmi_show_execution_state(
 
     if ( opt_show_all )
         show_execution_state(regs);
+    else if ( guest_mode(regs) )
+        printk(XENLOG_ERR "CPU%d\t%pv\t%04x:%p in guest\n",
+               cpu, current, regs->cs, _p(regs->rip));
     else
-        printk(XENLOG_ERR "CPU%d @ %04x:%08lx (%pS)\n", cpu, regs->cs,
-               regs->rip, guest_mode(regs) ? NULL : _p(regs->rip));
+        printk(XENLOG_ERR "CPU%d\t%pv\t%04x:%p in Xen: %pS\n",
+               cpu, current, regs->cs, _p(regs->rip), _p(regs->rip));
+
     cpumask_clear_cpu(cpu, &show_state_mask);
 
     return 1;
--
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