[Xen-changelog] Occasionally large smp machines fail to reboot properly and die under

[Xen patchbot -3.0-testing <patchbot-3.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 83072d72084a873e81ca188dcf9058072dba1a8d
# Parent  1d1a994059948396480130af9e2175c148295590
Occasionally large smp machines fail to reboot properly and die under
an IPI storm of smp_call_function() to machine_reboot.  Only the boot
processor needs to run machine_restart, so send an IPI to CPU0.

Original patch by: Ryan Harper <ryanh@xxxxxxxxxx>

Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r 1d1a99405994 -r 83072d72084a xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c     Thu Apr 27 09:47:42 2006 +0100
+++ b/xen/arch/x86/domain.c     Thu Apr 27 09:58:50 2006 +0100
@@ -143,7 +143,9 @@ void machine_restart(char * __unused)
     /* Ensure we are the boot CPU. */
     if ( GET_APIC_ID(apic_read(APIC_ID)) != boot_cpu_physical_apicid )
     {
-        smp_call_function((void *)machine_restart, NULL, 1, 0);
+        /* Send IPI to the boot CPU (logical cpu 0). */
+        on_selected_cpus(cpumask_of_cpu(0), (void *)machine_restart,
+                         NULL, 1, 0);
         for ( ; ; )
             safe_halt();
     }

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