src/patches/suse-2.6.27.39/patches.xen/xen3-panic-on-io-nmi.diff

   1 From: Kurt Garloff <garloff@suse.de>
   2 Subject: [PATCH] X86: sysctl to allow panic on IOCK NMI error
   3 References: bnc427979
   4
   5 This patch introduces a sysctl /proc/sys/kernel/panic_on_io_nmi.,
   6 which defaults to 0 (off).
   7 When enabled, the kernel panics when the kernel receives an NMI
   8 caused by an IO error.
   9
  10 The IO error triggered NMI indicates a serious system condition,
  11 which could result in IO data corruption. Rather than contiuing,
  12 panicing and dumping might be a better choice, so one can figure
  13 out what's causing the IO error.
  14 This could be especially important to companies running IO intensive
  15 applications where corruption must be avoided, e.g. a banks databases.
  16
  17
  18 Signed-off-by: Roberto Angelino <robertangelino@gmail.com>
  19
  20
  21 Automatically created from "patches.suse/panic-on-io-nmi.diff" by xen-port-patches.py
  22
  23 --- sle11-2009-08-26.orig/arch/x86/kernel/traps_32-xen.c        2008-11-25 13:17:09.000000000 +0100
  24 +++ sle11-2009-08-26/arch/x86/kernel/traps_32-xen.c     2008-11-25 13:13:12.000000000 +0100
  25 @@ -83,6 +83,7 @@ gate_desc idt_table[256]
  26  #endif
  27
  28  int panic_on_unrecovered_nmi;
  29 +int panic_on_io_nmi;
  30  int kstack_depth_to_print = 24;
  31  static unsigned int code_bytes = 64;
  32  #ifdef CONFIG_STACK_UNWIND
  33 @@ -738,6 +739,9 @@ io_check_error(unsigned char reason, str
  34         printk(KERN_EMERG "NMI: IOCK error (debug interrupt?)\n");
  35         show_registers(regs);
  36
  37 +       if (panic_on_io_nmi)
  38 +               panic("NMI IOCK error: Not continuing");
  39 +
  40         /* Re-enable the IOCK line, wait for a few seconds */
  41         clear_io_check_error(reason);
  42  }
  43 --- sle11-2009-08-26.orig/arch/x86/kernel/traps_64-xen.c        2008-11-25 13:17:09.000000000 +0100
  44 +++ sle11-2009-08-26/arch/x86/kernel/traps_64-xen.c     2008-11-25 13:13:12.000000000 +0100
  45 @@ -56,6 +56,7 @@
  46  #include <mach_traps.h>
  47
  48  int panic_on_unrecovered_nmi;
  49 +int panic_on_io_nmi;
  50  int kstack_depth_to_print = 12;
  51  static unsigned int code_bytes = 64;
  52  #ifdef CONFIG_STACK_UNWIND
  53 @@ -841,6 +842,9 @@ io_check_error(unsigned char reason, str
  54         printk("NMI: IOCK error (debug interrupt?)\n");
  55         show_registers(regs);
  56
  57 +       if (panic_on_io_nmi)
  58 +               panic("NMI IOCK error: Not continuing");
  59 +
  60         /* Re-enable the IOCK line, wait for a few seconds */
  61         clear_io_check_error(reason);
  62  }