linux-kernel - [PATCH 0/3] Provide mechanism to disable select RDT features & use for Skylake

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Date:   Thu, 24 Aug 2017 09:26:49 -0700
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Tony Luck <tony.luck@...el.com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Andi Kleen" <ak@...ux.intel.com>,
        "Stephane Eranian" <eranian@...gle.com>,
        "David Carrillo-Cisneros" <davidcc@...gle.com>
Subject: [PATCH 0/3] Provide mechanism to disable select RDT features & use for Skylake

From: Tony Luck <tony.luck@...el.com>

Some of the RDT features are affected by errata on Skylake. Make sure
unsuspecting users do not accidentally use these.

To do this we add a CPU model quirk mechanism that disables the
features affected by the errata by default. But also add a command
line mechanism for users to turn them back on again for cases
where the use case still works despite the issue.

First patch establishes the CPU quirk mechanism and uses it for
the existing Haswell probe code.

Second sets up the command line arguments.

Last adds the code for Skylake model to disable features
affected by errata.

Tony Luck (3):
  x86/intel_rdt: Move special case code for Haswell to a quirk function
  x86/intel_rdt: Add command line options for resource director
    technology
  x86/intel_rdt: Turn off most RDT features on Skylake

 Documentation/admin-guide/kernel-parameters.rst |   1 +
 Documentation/admin-guide/kernel-parameters.txt |   6 +
 arch/x86/kernel/cpu/intel_rdt.c                 | 147 +++++++++++++++++++-----
 3 files changed, 123 insertions(+), 31 deletions(-)

-- 
2.11.0