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Re: Howto read MSR thermal under XEN-4.15.0
- To: Julien Grall <julien@xxxxxxx>, Bobbi Sanchez <bobbisanchez@xxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 17 Jun 2021 13:26:51 +0200
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- Cc: Xen-users@xxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Thu, 17 Jun 2021 11:27:16 +0000
- List-id: Xen user discussion <xen-users.lists.xenproject.org>
On 17.06.2021 13:09, Julien Grall wrote:
> On 16/06/2021 23:39, Bobbi Sanchez wrote:
>> 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.
just as additional context (i.e. on top of Andrew's reply): It wasn't
that XSA, but our general switch of policy from blacklisting to
whitelisting MSRs. The XSA was about *_POWER_* and *_PERF_* MSRs.
Jan
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