x86/cpufreq: use host CPU policy for Turbo checking

There's no need to invoke CPUID yet another time - we assume symmetry
anyway. With symmetry assumed, logging per-CPU also isn't very useful.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>

xen/arch/x86/acpi/cpufreq/acpi.c

@@ -220,14 +220,11 @@ static unsigned int cf_check get_cur_freq_on_cpu(unsigned int cpu)
 
 void intel_feature_detect(struct cpufreq_policy *policy)
 {
-    unsigned int eax;
-
-    eax = cpuid_eax(6);
-    if (eax & 0x2) {
+    if ( cpu_has_turbo_boost )
+    {
         policy->turbo = CPUFREQ_TURBO_ENABLED;
-        if (cpufreq_verbose)
-            printk(XENLOG_INFO "CPU%u: Turbo Mode detected and enabled\n",
-                   smp_processor_id());
+        if ( cpufreq_verbose )
+            printk_once(XENLOG_INFO "Turbo Mode detected and enabled\n");
     }
 }
 

xen/arch/x86/include/asm/cpufeature.h

@@ -177,6 +177,7 @@ static inline bool boot_cpu_has(unsigned int feat)
 #define cpu_has_tbm             boot_cpu_has(X86_FEATURE_TBM)
 
 /* CPUID level 0x00000006.eax */
+#define cpu_has_turbo_boost     host_cpu_policy.basic.turbo_boost
 #define cpu_has_arat            host_cpu_policy.basic.arat
 
 /* CPUID level 0x00000006.ecx */