An assortment of BHI fixes.

Josh Poimboeuf (7):
  x86/bugs: BHI documentation fixes
  x86/bugs: Cache the value of MSR_IA32_ARCH_CAPABILITIES
  x86/bugs: Fix BHI handling of RRSBA
  x86/bugs: Clarify that syscall hardening isn't a BHI mitigation
  x86/bugs: Only harden syscalls when needed
  x86/bugs: Remove CONFIG_BHI_MITIGATION_AUTO and spectre_bhi=auto
  x86/bugs: Replace CONFIG_SPECTRE_BHI_{ON,OFF} with
    CONFIG_MITIGATION_SPECTRE_BHI

 Documentation/admin-guide/hw-vuln/spectre.rst | 22 ++---
 .../admin-guide/kernel-parameters.txt         | 12 +--
 arch/x86/Kconfig                              | 22 +----
 arch/x86/entry/common.c                       | 30 +++++-
 arch/x86/entry/syscall_32.c                   | 11 +--
 arch/x86/entry/syscall_64.c                   |  8 +-
 arch/x86/entry/syscall_x32.c                  |  7 +-
 arch/x86/include/asm/cpufeatures.h            |  1 +
 arch/x86/include/asm/syscall.h                |  8 +-
 arch/x86/kernel/cpu/bugs.c                    | 98 +++++++++++--------
 10 files changed, 119 insertions(+), 100 deletions(-)

-- 
2.44.0