[Xen-changelog] [xen-unstable] Add option "xen_processor_pm" in xen to enable dom0 external Cx control.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1209634858 -3600
# Node ID 74cae5c11f0a2fb81212b52b7a7b38b599fe2ac2
# Parent  5bb9093eb0e9abfcf8537148ba088fd2604e5737
Add option "xen_processor_pm" in xen to enable dom0 external Cx control.

Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>
---
 xen/arch/x86/setup.c |    7 +++++++
 1 files changed, 7 insertions(+)

diff -r 5bb9093eb0e9 -r 74cae5c11f0a xen/arch/x86/setup.c
--- a/xen/arch/x86/setup.c      Thu May 01 10:40:01 2008 +0100
+++ b/xen/arch/x86/setup.c      Thu May 01 10:40:58 2008 +0100
@@ -93,6 +93,11 @@ boolean_param("acpi_skip_timer_override"
 /* noapic: Disable IOAPIC setup. */
 extern int skip_ioapic_setup;
 boolean_param("noapic", skip_ioapic_setup);
+
+/* **** Linux config option: propagated to domain0. */
+/* xen_processor_pm: xen control cstate. */
+static int xen_processor_pm;
+boolean_param("xen_processor_pm", xen_processor_pm);
 
 int early_boot = 1;
 
@@ -1008,6 +1013,8 @@ void __init __start_xen(unsigned long mb
             safe_strcat(dom0_cmdline, " acpi=");
             safe_strcat(dom0_cmdline, acpi_param);
         }
+        if ( xen_processor_pm && !strstr(dom0_cmdline, 
"xen_processor_pmbits=") )
+            safe_strcat(dom0_cmdline, " xen_processor_pmbits=1");
 
         cmdline = dom0_cmdline;
     }

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