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Bug#970699: linux: Enable amd_energy driver

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  Bug#970699: linux: Enable amd_energy driver David Schiller <david.schiller@gmx.at> - 2020-09-22 00:30 +0200
    Bug#970699: linux: Enable amd_energy driver Salvatore Bonaccorso <carnil@debian.org> - 2020-11-13 15:00 +0100
      Bug#970699: linux: Enable amd_energy driver David Schiller <david.schiller@gmx.at> - 2020-11-17 21:40 +0100
    Bug#970699: marked as done (linux: Enable amd_energy driver) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-01-21 15:20 +0100

#68232 — Bug#970699: linux: Enable amd_energy driver

Source: linux
Severity: wishlist
X-Debbugs-Cc: david.schiller@gmx.at

Hi!

Could you please enable CONFIG_SENSORS_AMD_ENERGY as a module. This
provides RAPL energy monitoring on AMD Zen processors and has been
available since kernel 5.8.

Thanks in advance!

Dave


-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing'), (1, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.8.0-1-amd64 (SMP w/24 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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#68556

Hi,

On Tue, Sep 22, 2020 at 12:23:35AM +0200, David Schiller wrote:
> Source: linux
> Severity: wishlist
> X-Debbugs-Cc: david.schiller@gmx.at
> 
> Hi!
> 
> Could you please enable CONFIG_SENSORS_AMD_ENERGY as a module. This
> provides RAPL energy monitoring on AMD Zen processors and has been
> available since kernel 5.8.

If we are going to enable this for our builds, then we might need to
check that https://bugzilla.redhat.com/show_bug.cgi?id=1897402 is not
opened accordingly.

This relates to

https://support.lenovo.com/lu/uk/product_security/LEN-50481

and probably the reason for

https://lore.kernel.org/stable/238e3cf7-582f-a265-5300-9b44948107b0@roeck-us.net/T/#m11dee15be8c238d8858aafdf1a57e9ad7e0b9670

Regards,
Salvatore

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#68594

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On Fri, 2020-11-13 at 14:56 +0100, Salvatore Bonaccorso wrote:
> If we are going to enable this for our builds, then we might need to
> check that https://bugzilla.redhat.com/show_bug.cgi?id=1897402 is not
> opened accordingly.
> 
> This relates to
> 
> https://support.lenovo.com/lu/uk/product_security/LEN-50481
> 
> and probably the reason for
> 
> https://lore.kernel.org/stable/238e3cf7-582f-a265-5300-9b44948107b0@roeck-us.net/T/#m11dee15be8c238d8858aafdf1a57e9ad7e0b9670

Thanks for the response!

I skimmed through the paper covering the CVE and they mostly focused on Intel
SGX and only touched upon AMD briefly. They did there measurements with disabled
boost and fixed frequency, a configuration that no system in the wild actually
uses. Moreover the energy counters are exposed as an MSR, so in my opinion this
is more of a CPU-level bug. 

Personally I feel like recent security efforts are often crippling usability for
negligible gains.
 
Just my two cents!

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#69237 — Bug#970699: marked as done (linux: Enable amd_energy driver)

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Your message dated Thu, 21 Jan 2021 14:10:10 +0000
with message-id <E1l2af4-000F6H-0s@fasolo.debian.org>
and subject line Bug#970699: fixed in linux 5.10.9-1
has caused the Debian Bug report #970699,
regarding linux: Enable amd_energy driver
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
970699: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970699
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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