linux-kernel - [PATCH v3 0/3] arch/x86: Enable MPK feature on AMD

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Message-ID: <158923982830.20128.14580309786525588408.stgit@naples-babu.amd.com>
Date:   Mon, 11 May 2020 18:32:45 -0500
From:   Babu Moger <babu.moger@....com>
To:     corbet@....net, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
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Subject: [PATCH v3 0/3] arch/x86: Enable MPK feature on AMD

AMD's next generation of EPYC processors support the MPK (Memory
Protection Keys) feature.

AMD documentation for MPK feature is available at "AMD64 Architecture
Programmer’s Manual Volume 2: System Programming, Pub. 24593 Rev. 3.34,
Section 5.6.6 Memory Protection Keys (MPK) Bit".

The documentation can be obtained at the link below:
https://bugzilla.kernel.org/show_bug.cgi?id=206537

This series enables the feature on AMD and updates config parameters
to reflect the MPK support on generic x86 platforms.

---
v3:
  - Fixed the problem Jim Mattson pointed out which can cause pkru
    resources to get corrupted during host and guest switches. 
  - Moved the PKU feature detection code from VMX.c to common code.
  
v2:
  https://lore.kernel.org/lkml/158897190718.22378.3974700869904223395.stgit@naples-babu.amd.com/
  - Introduced intermediate config option X86_MEMORY_PROTECTION_KEYS to
    avoid user propmpts. Kept X86_INTEL_MEMORY_PROTECTION_KEYS as is.
    Eventually, we will be moving to X86_MEMORY_PROTECTION_KEYS after
    couple of kernel revisions. 
  - Moved pkru data structures to kvm_vcpu_arch. Moved save/restore pkru
    to kvm_load_host_xsave_state/kvm_load_guest_xsave_state.

v1:
  https://lore.kernel.org/lkml/158880240546.11615.2219410169137148044.stgit@naples-babu.amd.com/

Babu Moger (3):
      arch/x86: Rename config X86_INTEL_MEMORY_PROTECTION_KEYS to generic x86
      KVM: x86: Move pkru save/restore to x86.c
      KVM: x86: Move MPK feature detection to common code


 Documentation/core-api/protection-keys.rst     |    3 ++-
 arch/x86/Kconfig                               |   11 +++++++++--
 arch/x86/include/asm/disabled-features.h       |    4 ++--
 arch/x86/include/asm/kvm_host.h                |    1 +
 arch/x86/include/asm/mmu.h                     |    2 +-
 arch/x86/include/asm/mmu_context.h             |    4 ++--
 arch/x86/include/asm/pgtable.h                 |    4 ++--
 arch/x86/include/asm/pgtable_types.h           |    2 +-
 arch/x86/include/asm/special_insns.h           |    2 +-
 arch/x86/include/uapi/asm/mman.h               |    2 +-
 arch/x86/kernel/cpu/common.c                   |    2 +-
 arch/x86/kvm/cpuid.c                           |    4 +++-
 arch/x86/kvm/vmx/vmx.c                         |   22 ----------------------
 arch/x86/kvm/x86.c                             |   17 +++++++++++++++++
 arch/x86/mm/Makefile                           |    2 +-
 arch/x86/mm/pkeys.c                            |    2 +-
 scripts/headers_install.sh                     |    2 +-
 tools/arch/x86/include/asm/disabled-features.h |    4 ++--
 18 files changed, 48 insertions(+), 42 deletions(-)

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