[xen staging] x86/cpufreq: use host CPU policy for Turbo checking

[patchbot@xxxxxxx]

commit dc4d5f1ef6b73db6bb75e31d35223da21c5a52ea
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Jan 20 09:01:50 2026 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jan 20 09:01:50 2026 +0100

    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@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
---
 xen/arch/x86/acpi/cpufreq/acpi.c      | 11 ++++-------
 xen/arch/x86/include/asm/cpufeature.h |  1 +
 2 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/xen/arch/x86/acpi/cpufreq/acpi.c b/xen/arch/x86/acpi/cpufreq/acpi.c
index b027459417..2d08c3094f 100644
--- a/xen/arch/x86/acpi/cpufreq/acpi.c
+++ b/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");
     }
 }
 
diff --git a/xen/arch/x86/include/asm/cpufeature.h 
b/xen/arch/x86/include/asm/cpufeature.h
index f45295d84e..a0374c1b20 100644
--- a/xen/arch/x86/include/asm/cpufeature.h
+++ b/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 */
--
generated by git-patchbot for /home/xen/git/xen.git#staging