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author | kfraser@localhost.localdomain <kfraser@localhost.localdomain> | 2007-09-10 18:09:38 +0100 |
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committer | kfraser@localhost.localdomain <kfraser@localhost.localdomain> | 2007-09-10 18:09:38 +0100 |
commit | 4694a6028ca07e4008a59b02a1d1f0aa9887a00b (patch) | |
tree | 7b74879d964afc8f96153b771d8857b2d814a527 /xen/arch/x86/smp.c | |
parent | 78569aa816df0cccdb0c8d7e5359a85e66337265 (diff) | |
download | xen-4694a6028ca07e4008a59b02a1d1f0aa9887a00b.tar.gz xen-4694a6028ca07e4008a59b02a1d1f0aa9887a00b.tar.bz2 xen-4694a6028ca07e4008a59b02a1d1f0aa9887a00b.zip |
x86: Cleanup system restart code, and wait 10ms for APs to offline.
Signed-off-by: Joseph Cihula <joseph.cihula@intel.com>
Signed-off-by: Keir Fraser <keir@xensource.com>
Diffstat (limited to 'xen/arch/x86/smp.c')
-rw-r--r-- | xen/arch/x86/smp.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/xen/arch/x86/smp.c b/xen/arch/x86/smp.c index 1d83a3aba3..550faf069b 100644 --- a/xen/arch/x86/smp.c +++ b/xen/arch/x86/smp.c @@ -319,23 +319,33 @@ int on_selected_cpus( static void stop_this_cpu (void *dummy) { - cpu_clear(smp_processor_id(), cpu_online_map); - - local_irq_disable(); disable_local_APIC(); hvm_cpu_down(); + cpu_clear(smp_processor_id(), cpu_online_map); + for ( ; ; ) __asm__ __volatile__ ( "hlt" ); } +/* + * Stop all CPUs and turn off local APICs and the IO-APIC, so other OSs see a + * clean IRQ state. + */ void smp_send_stop(void) { - /* Stop all other CPUs in the system. */ + int timeout = 10; + smp_call_function(stop_this_cpu, NULL, 1, 0); + /* Wait 10ms for all other CPUs to go offline. */ + while ( (num_online_cpus() > 1) && (timeout-- > 0) ) + mdelay(1); + local_irq_disable(); disable_local_APIC(); + disable_IO_APIC(); + hvm_cpu_down(); local_irq_enable(); } |