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* [PATCH v2 0/6] Spectre v2 updates
@ 2018-02-10 23:39 David Woodhouse
  2018-02-10 23:39 ` [PATCH v2 1/6] x86/speculation: Update Speculation Control microcode blacklist David Woodhouse
                   ` (8 more replies)
  0 siblings, 9 replies; 21+ messages in thread
From: David Woodhouse @ 2018-02-10 23:39 UTC (permalink / raw)
  To: tglx, karahmed, sironi, x86, kvm, torvalds, pbonzini,
	linux-kernel, bp, peterz, jmattson, rkrcmar, arjan.van.de.ven,
	dave.hansen

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

^ permalink raw reply	[flat|nested] 21+ messages in thread

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Thread overview: 21+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-02-10 23:39 [PATCH v2 0/6] Spectre v2 updates David Woodhouse
2018-02-10 23:39 ` [PATCH v2 1/6] x86/speculation: Update Speculation Control microcode blacklist David Woodhouse
2018-02-12  9:50   ` Darren Kenny
2018-02-12 14:16   ` David Woodhouse
2018-02-12 14:32     ` Thomas Gleixner
2018-02-10 23:39 ` [PATCH v2 2/6] Revert "x86/speculation: Simplify indirect_branch_prediction_barrier()" David Woodhouse
2018-02-10 23:39 ` [PATCH v2 3/6] KVM: x86: Reduce retpoline performance impact in slot_handle_level_range() David Woodhouse
2018-02-10 23:39 ` [PATCH v2 4/6] X86/nVMX: Properly set spec_ctrl and pred_cmd before merging MSRs David Woodhouse
2018-02-10 23:39 ` [PATCH v2 5/6] KVM/nVMX: Set the CPU_BASED_USE_MSR_BITMAPS if we have a valid L02 MSR bitmap David Woodhouse
2018-02-11 10:19   ` Ingo Molnar
     [not found]     ` <1518345844.3677.365.camel@amazon.co.uk>
2018-02-11 10:55       ` Ingo Molnar
2018-02-10 23:39 ` [PATCH v2 6/6] x86/speculation: Use IBRS if available before calling into firmware David Woodhouse
2018-02-11 11:46   ` Ingo Molnar
2018-02-11 10:41 ` [PATCH v2 0/6] Spectre v2 updates Ingo Molnar
     [not found] ` <1518362359-1005-1-git-send-email-dwmw@amazon.co.uk>
2018-02-11 18:50   ` [PATCH] x86/speculation: Clean up various Spectre related details Ingo Molnar
2018-02-11 19:25     ` David Woodhouse
2018-02-11 19:43       ` Ingo Molnar
2018-02-12 15:30         ` David Woodhouse
2018-02-13  8:04           ` Ingo Molnar
2018-02-12  8:27 ` [PATCH v2 0/6] Spectre v2 updates Paolo Bonzini
2018-02-13  7:59   ` Ingo Molnar

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