linux-kernel - [PATCH v2 0/6] Spectre v2 updates

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Date:   Sat, 10 Feb 2018 23:39:21 +0000
From:   David Woodhouse <dwmw@...zon.co.uk>
To:     tglx@...utronix.de, karahmed@...zon.de, sironi@...zon.de,
        x86@...nel.org, kvm@...r.kernel.org, torvalds@...ux-foundation.org,
        pbonzini@...hat.com, linux-kernel@...r.kernel.org, bp@...en8.de,
        peterz@...radead.org, jmattson@...gle.com, rkrcmar@...hat.com,
        arjan.van.de.ven@...el.com, dave.hansen@...el.com
Subject: [PATCH v2 0/6] Spectre v2 updates

Using retpoline ensures the kernel is safe because it doesn't contain
any indirect branches, but firmware still can — and we make calls into
firmware at runtime. Where the IBRS microcode support is available, use
that before calling into firmware.

While doing that, I noticed that we were calling C functions without
telling the compiler about the call-clobbered registers. Stop that.

This also contains the always_inline fix for the performance problem
introduced by retpoline in KVM code, and fixes some other issues with
the per-vCPU KVM handling for the SPEC_CTRL MSR.

Finally, update the microcode blacklist to reflect the latest
information from Intel.

v2: Drop IBRS_ALL patch for the time being
    Add KVM MSR fixes (karahmed)
    Update microcode blacklist



David Woodhouse (4):
  x86/speculation: Update Speculation Control microcode blacklist
  Revert "x86/speculation: Simplify
    indirect_branch_prediction_barrier()"
  KVM: x86: Reduce retpoline performance impact in
    slot_handle_level_range()
  x86/speculation: Use IBRS if available before calling into firmware

KarimAllah Ahmed (2):
  X86/nVMX: Properly set spec_ctrl and pred_cmd before merging MSRs
  KVM/nVMX: Set the CPU_BASED_USE_MSR_BITMAPS if we have a valid L02 MSR
    bitmap

 arch/x86/include/asm/apm.h           |  6 ++++++
 arch/x86/include/asm/cpufeatures.h   |  1 +
 arch/x86/include/asm/efi.h           | 17 +++++++++++++++--
 arch/x86/include/asm/nospec-branch.h | 32 ++++++++++++++++++++++++++++----
 arch/x86/include/asm/processor.h     |  3 ---
 arch/x86/kernel/cpu/bugs.c           | 18 +++++++++++-------
 arch/x86/kernel/cpu/intel.c          |  4 ----
 arch/x86/kvm/mmu.c                   | 10 +++++-----
 arch/x86/kvm/vmx.c                   |  7 ++++---
 drivers/watchdog/hpwdt.c             |  3 +++
 10 files changed, 73 insertions(+), 28 deletions(-)

-- 
2.7.4