From: jbeulich@novell.com
Subject: make /proc/cpuinfo track CPU speed
Patch-mainline: obsolete

--- head-2010-10-05.orig/arch/x86/kernel/acpi/processor_extcntl_xen.c	2010-10-06 17:02:47.000000000 +0200
+++ head-2010-10-05/arch/x86/kernel/acpi/processor_extcntl_xen.c	2010-10-06 17:04:43.000000000 +0200
@@ -208,3 +208,14 @@ static int __init init_extcntl(
 	return 0;
 }
 arch_initcall(init_extcntl);
+
+unsigned int cpufreq_quick_get(unsigned int cpu)
+{
+	xen_platform_op_t op = {
+		.cmd			= XENPF_get_cpu_freq,
+		.interface_version	= XENPF_INTERFACE_VERSION,
+		.u.get_cpu_freq.vcpu	= cpu
+	};
+
+	return HYPERVISOR_platform_op(&op) == 0 ? op.u.get_cpu_freq.freq : 0;
+}
--- head-2010-10-05.orig/include/linux/cpufreq.h	2010-10-06 16:54:08.000000000 +0200
+++ head-2010-10-05/include/linux/cpufreq.h	2010-08-25 14:41:45.000000000 +0200
@@ -328,7 +328,7 @@ static inline unsigned int cpufreq_get(u
 #endif
 
 /* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
-#ifdef CONFIG_CPU_FREQ
+#if defined(CONFIG_CPU_FREQ) || defined(CONFIG_PROCESSOR_EXTERNAL_CONTROL)
 unsigned int cpufreq_quick_get(unsigned int cpu);
 #else
 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
--- head-2010-10-05.orig/include/xen/interface/platform.h	2010-01-04 11:56:34.000000000 +0100
+++ head-2010-10-05/include/xen/interface/platform.h	2010-06-22 15:48:58.000000000 +0200
@@ -355,6 +355,14 @@ struct xenpf_mem_hotadd
     uint32_t flags;
 };
 
+#define XENPF_get_cpu_freq        ('N' << 24)
+struct xenpf_get_cpu_freq {
+    /* IN variables */
+    uint32_t vcpu;
+    /* OUT variables */
+    uint32_t freq; /* in kHz */
+};
+
 struct xen_platform_op {
     uint32_t cmd;
     uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -374,6 +382,7 @@ struct xen_platform_op {
         struct xenpf_cpu_ol            cpu_ol;
         struct xenpf_cpu_hotadd        cpu_add;
         struct xenpf_mem_hotadd        mem_add;
+        struct xenpf_get_cpu_freq      get_cpu_freq;
         uint8_t                        pad[128];
     } u;
 };