linux-kernel - [PATCH v2 0/9] Add CPU-type to topology

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Date: Thu, 27 Jun 2024 13:44:00 -0700
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org
Cc: daniel.sneddon@...ux.intel.com, tony.luck@...el.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Brice Goglin <brice.goglin@...il.com>,
	Mario Limonciello <mario.limonciello@....com>,
	Perry Yuan <Perry.Yuan@....com>,
	Dapeng Mi <dapeng1.mi@...ux.intel.com>
Subject: [PATCH v2 0/9] Add CPU-type to topology

v2:
- Move CPU-type to the end of the CPU topology structure (Andrew).
- Use c->cpuid_level instead of cpuid_eax(0) (Andrew).
- Move CPU-type enum out of ifdef CONFIG_NUMA (kernel test robot).
- Rename cpu_type to hw_cpu_type (Borislav).
- Explain replacing get_this_hybrid_cpu_type() with topology_hw_cpu_type()
  in the commit message (Dave).
- Fix the alignment in cpu_vuln_whitelist (Andrew).
- Add the obj compare note in the commit message (Dave/Tony).
- s/X86_CPU_TYPE_INTEL_ATOM/ATOM/ in cpu_vuln_whitelist (Dave).

v1: https://lore.kernel.org/r/20240617-add-cpu-type-v1-0-b88998c01e76@linux.intel.com

Hi,

This series adds support for CPU-type (CPUID.1A.EAX[31-24] on Intel) to
differentiate between hybrid variants P+E, P-only, E-only that share the
same Family/Model/Stepping. One of the use case for CPU-type is the
affected CPU table for CPU vulnerabilities, which can now use the CPU-type
to filter the unaffected variants.

* Patch 1 adds hardware cpu-type to CPU topology structure and introduces
  topology_hw_cpu_type().

* Patch 2-4 replaces usages of get_this_hybrid_cpu_type() with
  topology_hw_cpu_type().

* Patch 5-7 Updates CPU-matching infrastructure to use CPU-type.

* Patch 8 cleans up the affected CPU list.

* Patch 9 uses the CPU-type to exclude P-only parts from the RFDS affected
  list.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
---
Pawan Gupta (9):
      x86/cpu/topology: Add CPU type to struct cpuinfo_topology
      cpufreq: intel_pstate: Use topology_cpu_type()
      perf/x86/intel: Use topology_hw_cpu_type()
      x86/cpu: Remove get_this_hybrid_cpu_type()
      x86/cpu: Name CPU matching macro more generically (and shorten)
      x86/cpu: Add cpu_type to struct x86_cpu_id
      x86/cpu: Update x86_match_cpu() to also use cpu-type
      x86/bugs: Declutter vulnerable CPU list
      x86/rfds: Exclude P-only parts from the RFDS affected list

 .../admin-guide/hw-vuln/reg-file-data-sampling.rst |   8 --
 arch/x86/events/intel/core.c                       |   2 +-
 arch/x86/include/asm/cpu.h                         |   6 -
 arch/x86/include/asm/cpu_device_id.h               | 117 +++++++----------
 arch/x86/include/asm/processor.h                   |   3 +
 arch/x86/include/asm/topology.h                    |   9 ++
 arch/x86/kernel/cpu/common.c                       | 138 +++++++++++----------
 arch/x86/kernel/cpu/debugfs.c                      |   1 +
 arch/x86/kernel/cpu/intel.c                        |  16 ---
 arch/x86/kernel/cpu/match.c                        |  22 ++++
 arch/x86/kernel/cpu/topology_common.c              |   9 ++
 drivers/cpufreq/intel_pstate.c                     |  14 +--
 include/linux/mod_devicetable.h                    |   2 +
 13 files changed, 168 insertions(+), 179 deletions(-)
---
base-commit: f2661062f16b2de5d7b6a5c42a9a5c96326b8454
change-id: 20240617-add-cpu-type-4d5e47efc117

Best regards,
-- 
Thanks,
Pawan