Alternatives have had a reasonably severe restriction since their
introduction.  This has been the source of several bugs, and several
inefficiencies particularly in the speculative safety paths.

https://gitlab.com/xen-project/hardware/xen-staging/-/pipelines/2724019865

v3:
 * Run through Gitlab CI.
 * Fix up Eclair issues, Clang issues, and older-binutils issues.

Andrew Cooper (5):
  x86/emul: Introduce x86_decode_lite()
  tests/x86: Introduce a userspace test harness for x86_decode_lite()
  x86/alternative: Walk all replacements during self tests
  x86/alternative: Relocate all insn-relative fields
  x86/spec-ctrl: Introduce and use DO_COND_BHB_SEQ

 tools/tests/Makefile                      |   1 +
 tools/tests/x86-decode-lite/.gitignore    |   1 +
 tools/tests/x86-decode-lite/Makefile      |  56 ++
 tools/tests/x86-decode-lite/insns.S       | 703 ++++++++++++++++++++++
 tools/tests/x86-decode-lite/macro-magic.h |  62 ++
 tools/tests/x86-decode-lite/main.c        | 111 ++++
 tools/tests/x86-decode-lite/x86-emulate.h |  27 +
 xen/arch/x86/alternative.c                | 102 +++-
 xen/arch/x86/hvm/vmx/entry.S              |  12 +-
 xen/arch/x86/include/asm/spec_ctrl_asm.h  |  43 +-
 xen/arch/x86/x86_emulate/Makefile         |   6 +
 xen/arch/x86/x86_emulate/decode-lite.c    | 330 ++++++++++
 xen/arch/x86/x86_emulate/x86_emulate.h    |  14 +
 13 files changed, 1434 insertions(+), 34 deletions(-)
 create mode 100644 tools/tests/x86-decode-lite/.gitignore
 create mode 100644 tools/tests/x86-decode-lite/Makefile
 create mode 100644 tools/tests/x86-decode-lite/insns.S
 create mode 100644 tools/tests/x86-decode-lite/macro-magic.h
 create mode 100644 tools/tests/x86-decode-lite/main.c
 create mode 100644 tools/tests/x86-decode-lite/x86-emulate.h
 create mode 100644 xen/arch/x86/x86_emulate/decode-lite.c

-- 
2.39.5