[Xen-devel] [PATCH] x86: get the MWAIT idle driver in sync with the ACPI one

["Jan Beulich" <JBeulich@xxxxxxxx>]

.. with respect to behavior when there is no HPET broadcast support
(for using the PIT broadcast instead, it requires explicitly enabling
CPU idle management).

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -501,11 +501,14 @@ int __init mwait_idle_init(struct notifi
                return -ENODEV;
 
        err = mwait_idle_probe();
-       if (!err) {
-               if (!boot_cpu_has(X86_FEATURE_ARAT))
-                       hpet_broadcast_init();
-               if (!lapic_timer_init())
+       if (!err && !boot_cpu_has(X86_FEATURE_ARAT)) {
+               hpet_broadcast_init();
+               if (xen_cpuidle < 0 && !hpet_broadcast_is_available())
+                       err = -ENODEV;
+               else if(!lapic_timer_init())
                        err = -EINVAL;
+               if (err)
+                       pr_debug(PREFIX "not used (%d)\n", err);
        }
        if (!err) {
                nfb->notifier_call = mwait_idle_cpu_init;

Attachment: x86-MWAIT-idle-match-ACPI.patch
Description: Text document

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