Merge android-4.9.176 (e0625b31) into msm-4.9

* refs/heads/tmp-e0625b31:
  Linux 4.9.176
  x86/cpu/bugs: Use __initconst for 'const' init data
  x86: stop exporting msr-index.h to userland
  x86/speculation/mds: Fix documentation typo
  Documentation: Correct the possible MDS sysfs values
  x86/mds: Add MDSUM variant to the MDS documentation
  x86/speculation/mds: Add 'mitigations=' support for MDS
  x86/speculation: Support 'mitigations=' cmdline option
  cpu/speculation: Add 'mitigations=' cmdline option
  x86/speculation/mds: Print SMT vulnerable on MSBDS with mitigations off
  x86/speculation/mds: Fix comment
  x86/speculation/mds: Add SMT warning message
  x86/speculation: Move arch_smt_update() call to after mitigation decisions
  x86/speculation/mds: Add mds=full,nosmt cmdline option
  Documentation: Add MDS vulnerability documentation
  Documentation: Move L1TF to separate directory
  x86/speculation/mds: Add mitigation mode VMWERV
  x86/speculation/mds: Add sysfs reporting for MDS
  x86/speculation/mds: Add mitigation control for MDS
  x86/speculation/mds: Conditionally clear CPU buffers on idle entry
  x86/kvm/vmx: Add MDS protection when L1D Flush is not active
  x86/speculation/mds: Clear CPU buffers on exit to user
  x86/speculation/mds: Add mds_clear_cpu_buffers()
  x86/kvm: Expose X86_FEATURE_MD_CLEAR to guests
  x86/speculation/mds: Add BUG_MSBDS_ONLY
  x86/speculation/mds: Add basic bug infrastructure for MDS
  x86/speculation: Consolidate CPU whitelists
  x86/msr-index: Cleanup bit defines
  kvm: x86: Report STIBP on GET_SUPPORTED_CPUID
  x86/speculation: Provide IBPB always command line options
  x86/speculation: Add seccomp Spectre v2 user space protection mode
  x86/speculation: Enable prctl mode for spectre_v2_user
  x86/speculation: Add prctl() control for indirect branch speculation
  x86/speculation: Prevent stale SPEC_CTRL msr content
  x86/speculation: Prepare arch_smt_update() for PRCTL mode
  x86/speculation: Split out TIF update
  x86/speculation: Prepare for conditional IBPB in switch_mm()
  x86/speculation: Avoid __switch_to_xtra() calls
  x86/process: Consolidate and simplify switch_to_xtra() code
  x86/speculation: Prepare for per task indirect branch speculation control
  x86/speculation: Add command line control for indirect branch speculation
  x86/speculation: Unify conditional spectre v2 print functions
  x86/speculataion: Mark command line parser data __initdata
  x86/speculation: Mark string arrays const correctly
  x86/speculation: Reorder the spec_v2 code
  x86/l1tf: Show actual SMT state
  x86/speculation: Rework SMT state change
  sched: Add sched_smt_active()
  x86/Kconfig: Select SCHED_SMT if SMP enabled
  x86/speculation: Reorganize speculation control MSRs update
  x86/speculation: Rename SSBD update functions
  x86/speculation: Disable STIBP when enhanced IBRS is in use
  x86/speculation: Move STIPB/IBPB string conditionals out of cpu_show_common()
  x86/speculation: Remove unnecessary ret variable in cpu_show_common()
  x86/speculation: Clean up spectre_v2_parse_cmdline()
  x86/speculation: Update the TIF_SSBD comment
  x86/speculation/l1tf: Drop the swap storage limit restriction when l1tf=off
  x86/speculation: Propagate information about RSB filling mitigation to sysfs
  x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation
  x86/speculation: Apply IBPB more strictly to avoid cross-process data leak
  Documentation/l1tf: Fix small spelling typo
  x86/cpu: Sanitize FAM6_ATOM naming
  x86/speculation: Remove SPECTRE_V2_IBRS in enum spectre_v2_mitigation
  locking/atomics, asm-generic: Move some macros from <linux/bitops.h> to a new <linux/bits.h> file
  x86/speculation: Simplify the CPU bug detection logic
  bitops: avoid integer overflow in GENMASK(_ULL)
  x86/mm: Use WRITE_ONCE() when setting PTEs
  x86/microcode: Update the new microcode revision unconditionally
  x86/microcode: Make sure boot_cpu_data.microcode is up-to-date
  x86/microcode/intel: Check microcode revision before updating sibling threads
  x86/microcode/intel: Add a helper which gives the microcode revision
  x86/bugs: Fix the AMD SSBD usage of the SPEC_CTRL MSR
  x86/bugs: Switch the selection of mitigation from CPU vendor to CPU features
  x86/bugs: Add AMD's SPEC_CTRL MSR usage
  x86/bugs: Add AMD's variant of SSB_NO
  x86/cpufeatures: Hide AMD-specific speculation flags
  x86/MCE: Save microcode revision in machine check records

Change-Id: Id09a1a4ec13f957e08f5ccf33ff00781d92d3316
Signed-off-by: jianzhou <jianzhou@codeaurora.org>