[IA64] Support domU coredump on ia64

This patch supports domU coredump on ia64.  xen_panic_event() is
registered to panic_notifier_list, and xen_panic_event() calls
HYPERVISOR_shutdown(SHUTDOWN_crash) at panic time.

If xend is notified of crash status, xend calls dumpCore()
and create domU's core in /var/xen/dump.

For sample crash module and usage, see:

http://lists.xensource.com/archives/html/xen-ia64-devel/2006-07/msg00230.html

Signed-off-by: Akio Takebe <takebe_akio@jp.fujitsu.com>
[minor code re-arrangement]
Signed-off-by: Alex Williamson <alex.williamson@hp.com>

diff --git a/linux-2.6-xen-sparse/arch/ia64/kernel/setup.c b/linux-2.6-xen-sparse/arch/ia64/kernel/setup.c
index 463188ce092d9ea466caf1de6d974c8f40b94f09..12ab159f0d8181239a33353a5dcfe15dd2708c41 100644 (file)
--- a/linux-2.6-xen-sparse/arch/ia64/kernel/setup.c
+++ b/linux-2.6-xen-sparse/arch/ia64/kernel/setup.c
@@ -75,6 +75,20 @@ unsigned long __per_cpu_offset[NR_CPUS];
 EXPORT_SYMBOL(__per_cpu_offset);
 #endif
 
+#ifdef CONFIG_XEN
+static int
+xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+       HYPERVISOR_shutdown(SHUTDOWN_crash);
+       /* we're never actually going to get here... */
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block xen_panic_block = {
+       xen_panic_event, NULL, 0 /* try to go last */
+};
+#endif
+
 extern void ia64_setup_printk_clock(void);
 
 DEFINE_PER_CPU(struct cpuinfo_ia64, cpu_info);
@@ -418,8 +432,11 @@ setup_arch (char **cmdline_p)
        unw_init();
 
 #ifdef CONFIG_XEN
-       if (is_running_on_xen())
+       if (is_running_on_xen()) {
                setup_xen_features();
+               /* Register a call for panic conditions. */
+               notifier_chain_register(&panic_notifier_list, &xen_panic_block);
+       }
 #endif
 
        ia64_patch_vtop((u64) __start___vtop_patchlist, (u64) __end___vtop_patchlist);