Re: Howto read MSR thermal under XEN-4.15.0

[Julien Grall <julien@xxxxxxx>]

(+ Andrew and Jan)

Hi,

On 16/06/2021 23:39, Bobbi Sanchez wrote:
> Hi,
>
> how can i read the MSR Thermal Values under XEN-4.15.0 ?
>
> Usually without having XEN-4.15.0 installed i can read the MSR Thermal 
> Values like this:
> rdmsr -p 0 -d -f22:16 0x19c
>
> this works for my Core2Quod Q6600.
>
> But after having xen-4.15.0 installed and booted, same command shows now: 0
I believe the access was restricted as part of XSA-351 [1]. I am not 
sure if there are a safe generic way to access them. I will let Andrew 
and Jan commenting.
[1] https://xenbits.xen.org/xsa/advisory-351.html
> Best Regards
>
> B. S.
--
Julien Grall