linux-kernel - [PATCH v2 0/8] Speculation Control feature support, IBPB

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Date:   Sun, 21 Jan 2018 09:49:01 +0000
From:   David Woodhouse <dwmw@...zon.co.uk>
To:     arjan@...ux.intel.com, tglx@...utronix.de, karahmed@...zon.de,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        tim.c.chen@...ux.intel.com, bp@...en8.de, peterz@...radead.org,
        pbonzini@...hat.com, ak@...ux.intel.com,
        torvalds@...ux-foundation.org, gregkh@...ux-foundation.org
Subject: [PATCH v2 0/8] Speculation Control feature support, IBPB

Combining my previous patchset for purely adding the feature and MSR
definitions, with the first four patches that Karim sent out which were
purely about enabling IBPB. This gives us a full retpoline-based
mitigation for Spectre variant 2, and the IBRS option can come later.

I expect further discussion of the final patch to tweak precisely when
we use IBPB in context switch.

---
v2: Fix STIPB/STIBP typo
    Fix error in AMD CPUID bit definition (0x8000_0008 EBX[12])


Ashok Raj (1):
  x86/kvm: Add IBPB support

David Woodhouse (4):
  x86/cpufeatures: Add Intel feature bits for Speculation Control
  x86/cpufeatures: Add AMD feature bits for Prediction Command
  x86/msr: Add definitions for new speculation control MSRs
  x86/pti: Do not enable PTI on fixed Intel processors

Thomas Gleixner (2):
  x86/speculation: Add basic support for IBPB
  x86/speculation: Use Indirect Branch Prediction Barrier in context
    switch

Tim Chen (1):
  x86/mm: Only flush indirect branches when switching into non dumpable
    process

 arch/x86/include/asm/cpufeature.h        |  7 +++++--
 arch/x86/include/asm/cpufeatures.h       | 14 +++++++++++---
 arch/x86/include/asm/disabled-features.h |  3 ++-
 arch/x86/include/asm/msr-index.h         | 11 +++++++++++
 arch/x86/include/asm/nospec-branch.h     | 16 ++++++++++++++++
 arch/x86/include/asm/required-features.h |  3 ++-
 arch/x86/kernel/cpu/bugs.c               |  7 +++++++
 arch/x86/kernel/cpu/common.c             | 10 ++++++++--
 arch/x86/kernel/cpu/scattered.c          |  3 +--
 arch/x86/kvm/svm.c                       | 14 ++++++++++++++
 arch/x86/kvm/vmx.c                       | 11 +++++++++++
 arch/x86/mm/tlb.c                        | 21 ++++++++++++++++++++-
 12 files changed, 108 insertions(+), 12 deletions(-)

-- 
2.7.4