[Xen-users] [PATCH] RHEL/CentOS 5, Xen 3.4.1 and Power Management

["T. Eichstädt" <abc@xxxxxxxxxx>]

Dear all,

Hypervisor-based PM is not working under CentOS 5 with its original kernel.
I had some difficulties to get at least Domain0 based cpufreq working 
under the CentOS 5 Kernel and Xen 3.4.1. There are problems with the 
detection of the corrrect Processor ID because the interface of Xen 
changed a little bit.
With the following patch power management in the combination of CentOS 5 
Kernel and Xen 3.4.1 is working again (It is mainly a revert of 
http://xen.markmail.org/message/ptnjmjaobb3bsutp?q=cpu_id.phys_id).
Hope somebody finds this useful.

Best regards
 Thimo Eichstädt

!!! ATTENTION, PATCH IS ONLY MEANT TO GET PM WORKING WITH CENTOS 5 
KERNEL !!!
diff -uNr xen-3.4.1.orig/xen/arch/x86/domain.c 
xen-3.4.1/xen/arch/x86/domain.c
--- xen-3.4.1.orig/xen/arch/x86/domain.c        2009-08-06 
15:57:27.000000000 +0200
+++ xen-3.4.1/xen/arch/x86/domain.c     2009-09-07 22:15:33.000000000 +0200
@@ -911,9 +911,8 @@
        if ( !v->domain->is_pinned )
            break;

-        cpu_id.phys_id =
-            (uint64_t)x86_cpu_to_apicid[v->vcpu_id] |
-            ((uint64_t)acpi_get_processor_id(v->vcpu_id) << 32);
+        cpu_id.phys_id = (x86_cpu_to_apicid[v->vcpu_id] |
+                         (acpi_get_processor_id(v->vcpu_id) << 8));

        rc = -EFAULT;
        if ( copy_to_guest(arg, &cpu_id, 1) )
diff -uNr xen-3.4.1.orig/xen/common/domain.c xen-3.4.1/xen/common/domain.c
--- xen-3.4.1.orig/xen/common/domain.c  2009-08-06 15:57:27.000000000 +0200
+++ xen-3.4.1/xen/common/domain.c       2009-09-07 22:14:13.000000000 +0200
@@ -41,7 +41,7 @@
boolean_param("dom0_vcpus_pin", opt_dom0_vcpus_pin);

/* set xen as default cpufreq */
-enum cpufreq_controller cpufreq_controller = FREQCTL_xen;
+enum cpufreq_controller cpufreq_controller = FREQCTL_dom0_kernel;

static void __init setup_cpufreq_option(char *str)
{




_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users