[Xen-devel] [PATCH] Append 'nohpet' in dom0 cmdline to prevent dom0 from using HPET

["Wei, Gang" <gang.wei@xxxxxxxxx>]

Append 'nohpet' in dom0 cmdline to prevent dom0 from using HPET

Xen is using HPET to wakeup cpu from deep c-states, so the HPET usage in dom0
must be fobidden. In 2.6.18-xen, the HPET was by default disabled in config
file. For upstream kernel built for pv dom0, it is not practical to disable dom0
HPET usage in that way because the same image may be also using as bare metal 
kernerl. So add cmdline option to do this thing for dom0.

Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>

diff -r 9ba855e57afb xen/arch/x86/setup.c
--- a/xen/arch/x86/setup.c      Tue Sep 29 20:56:30 2009 +0800
+++ b/xen/arch/x86/setup.c      Tue Oct 13 22:32:13 2009 +0800
@@ -1106,6 +1106,7 @@ void __init __start_xen(unsigned long mb
             safe_strcat(dom0_cmdline, " acpi=");
             safe_strcat(dom0_cmdline, acpi_param);
         }
+        safe_strcat(dom0_cmdline, " nohpet");
 
         cmdline = dom0_cmdline;
     }

Attachment: disable-dom0-hpet.patch
Description: disable-dom0-hpet.patch

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