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    SubjectRe: [PATCH v2 0/6] Spectre v2 updates
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    Date
    On 11/02/2018 00:39, David Woodhouse wrote:
    > 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(-)
    >

    Acked-by: Paolo Bonzini <pbonzini@redhat.com>

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