[xen master] xen/cpufreq: make HW_ALL the only expected value for CPPC mode

[patchbot@xxxxxxx]

commit f404dad459a610c33d5987a3c2eb8bafda720932
Author:     Penny Zheng <Penny.Zheng@xxxxxxx>
AuthorDate: Thu Sep 25 09:19:41 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Sep 25 09:19:41 2025 +0200

    xen/cpufreq: make HW_ALL the only expected value for CPPC mode
    
    Right now, no matter for code construction or hardware restriction, HW_ALL
    shall be the only expected values in _PSD for AMD CPPC mode
    
    Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
    Signed-off-by: Penny Zheng <Penny.Zheng@xxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/drivers/cpufreq/cpufreq.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/xen/drivers/cpufreq/cpufreq.c b/xen/drivers/cpufreq/cpufreq.c
index fe6bd7ff25..4b74f5590b 100644
--- a/xen/drivers/cpufreq/cpufreq.c
+++ b/xen/drivers/cpufreq/cpufreq.c
@@ -765,6 +765,16 @@ int set_cppc_pminfo(unsigned int acpi_id,
         goto out;
     }
 
+    /* Right now, HW_ALL shall be the only expected value in CPPC mode */
+    if ( cppc_data->shared_type != CPUFREQ_SHARED_TYPE_HW )
+    {
+        ret = -EINVAL;
+        printk_once(XENLOG_ERR
+                    "Unsupported sharing type %u in CPPC mode\n",
+                    cppc_data->shared_type);
+        goto out;
+    }
+
     if ( cppc_data->flags & XEN_CPPC_CPC )
     {
         if ( cppc_data->cpc.highest_perf == 0 ||
--
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