[Xen-devel] Xen hiding thermal capabilities from Dom0

[Rishi <2rushikeshj@xxxxxxxxx>]

Hi,

In some of our hosts, Xen is not correctly exposing processor thermal
capabilities to Dom0.
Please refer: https://bugzilla.kernel.org/show_bug.cgi?id=205347

The flag
/* Thermal and Power Management Leaf, CPUID level 0x00000006 (EAX), word 14 */
X86_FEATURE_DTHERM (14*32+ 0)

is returned 0 via PVOP_VCALL4 vs returns 1 via native_cpuid() call from Dom0.

Sample output via PVCALL vs Native call.
[63291.688755] cpuid_eax 6 :  a 0
[63291.688759] native_cpuid : a 77

Is this a bug or needs some special feature to be enabled from Xen command line?

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