[PATCH v4 0/6] x86/bugs: RSB mitigation fixes and documentation

[Josh Poimboeuf]

v4:
- improve document
- remove C++ comment
- "__write_ibpb" -> "write-ibpb"
- improve commit logs

v3: https://lore.kernel.org/cover.1743617897.git.jpoimboe@xxxxxxxxxx

Josh Poimboeuf (6):
  x86/bugs: Rename entry_ibpb() to write_ibpb()
  x86/bugs: Use SBPB in write_ibpb() if applicable
  x86/bugs: Fix RSB clearing in indirect_branch_prediction_barrier()
  x86/bugs: Don't fill RSB on VMEXIT with eIBRS+retpoline
  x86/bugs: Don't fill RSB on context switch with eIBRS
  x86/bugs: Add RSB mitigation document

 Documentation/admin-guide/hw-vuln/index.rst |   1 +
 Documentation/admin-guide/hw-vuln/rsb.rst   | 268 ++++++++++++++++++++
 arch/x86/entry/entry.S                      |   9 +-
 arch/x86/include/asm/nospec-branch.h        |  12 +-
 arch/x86/kernel/cpu/bugs.c                  | 107 +++-----
 arch/x86/mm/tlb.c                           |   6 +-
 6 files changed, 317 insertions(+), 86 deletions(-)
 create mode 100644 Documentation/admin-guide/hw-vuln/rsb.rst

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2.49.0