[PATCH v1 0/4] x86: Remove direct use of MSR_IA32_ENERGY_PERF_BIAS

From: Borislav Petkov
Date: Thu Oct 29 2020 - 15:03:23 EST


From: Borislav Petkov <bp@xxxxxxx>

Hi,

here's v2 with some of Shuah's comments integrated.

If no one has anything against it, I'll route them all through tip.

Thx.

---
Changelog:

v0:
--

here's something from my todo list: remove all in-kernel tools use of
that MSR and lastly drop it from the allowed-MSRs-list in the filtering.

Out-of-tree tools should do a similar, trivial conversion.

Constructive comments are, as always, appreciated.

Borislav Petkov (4):
tools/power/cpupower: Read energy_perf_bias from sysfs
tools/power/turbostat: Read energy_perf_bias from sysfs
tools/power/x86_energy_perf_policy: Read energy_perf_bias from sysfs
x86/msr: Do not allow writes to MSR_IA32_ENERGY_PERF_BIAS

arch/x86/kernel/msr.c | 3 -
tools/power/cpupower/lib/cpupower.c | 23 +++-
tools/power/cpupower/lib/cpupower_intern.h | 5 +
tools/power/cpupower/utils/cpupower-info.c | 2 +-
tools/power/cpupower/utils/cpupower-set.c | 2 +-
tools/power/cpupower/utils/helpers/helpers.h | 8 +-
tools/power/cpupower/utils/helpers/misc.c | 48 ++++++++
tools/power/cpupower/utils/helpers/msr.c | 28 -----
tools/power/x86/turbostat/turbostat.c | 29 ++++-
.../x86_energy_perf_policy.c | 109 ++++++++++++++++--
10 files changed, 204 insertions(+), 53 deletions(-)

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2.21.0