XCP 8.3 coretemp module doesn't detect any sensors

[mikhail-shevtsov-wiregate]

When installed XCP-NG 8.2 with coretemp-module-alt I was able to check CPU temperature using lm_sensors package.
CPU: Intel(R) Xeon(R) CPU E5-2689 0 @ 2.60GHz
But when I reinstalled from scratch XCP-NG 8.3 with same package it cannot longer detect any sensors on motherboard.

Any hint would be appreciated.

[olivierlambert]

Pinging @gduperrey

[SlashQuit]

Same/similar as per;
#415
#249
... and then one in the "Feedback" section at;
https://xcp-ng.org/forum/topic/9765/coretemp-alt-no-longer-works-with-8-3

This includes with a rebuilt coretemp.ko from;
https://github.com/rushikeshjadhav/coretemp
(Using 8.3 instead of 8.0, and a 8.3 xcp-ng-build-env from ...)
https://github.com/xcp-ng/xcp-ng-build-env

[wechka53]

Same here. No sensors found from release 8.3.
8.2 and even 8.3 betas were working fine

[tescande]

Access to these CPU registers (MSRs) is actually not allowed in the context of a virtual machine, even in dom0. The fact that it was previously possible is more accidental and access is now disabled in the hypervisor. One reason for that is https://xenbits.xen.org/xsa/advisory-351.html

So even with the modifications done to the coretemp alt driver to work on 8.2, it is not possible to get it working on 8.3. And I suppose it was working on 8.3 beta prior to the introduction of Xen 4.17.