On Thu, May 12, 2022 at 01:56:47PM +0000, Maximilian Heyne wrote:
> This is a backport of a patch series for 5.4.x.
>
> The patch series allows the x86 decoder to decode the Xen and KVM emulate
> prefixes.
>
> In particular this solves the following issue that appeared when commit
> db6c6a0df840 ("objtool: Fix noreturn detection for ignored functions") was
> backported to 5.4.69:
>
> arch/x86/xen/enlighten_pv.o: warning: objtool: xen_cpuid()+0x25: can't find jump dest instruction at .text+0x9c
>
> Also now that this decoding is possible, also backport the commit which prevents
> kprobes on probing such prefixed instructions. This was also part of the
> original series.
>
> The series applied mostly cleanly on 5.4.192 except for a contextual problem in
> the 3rd patch ("x86: xen: insn: Decode Xen and KVM emulate-prefix signature").
>
> Masami Hiramatsu (4):
> x86/asm: Allow to pass macros to __ASM_FORM()
> x86: xen: kvm: Gather the definition of emulate prefixes
> x86: xen: insn: Decode Xen and KVM emulate-prefix signature
> x86: kprobes: Prohibit probing on instruction which has emulate prefix
>
> arch/x86/include/asm/asm.h | 8 +++--
> arch/x86/include/asm/emulate_prefix.h | 14 +++++++++
> arch/x86/include/asm/insn.h | 6 ++++
> arch/x86/include/asm/xen/interface.h | 11 +++----
> arch/x86/kernel/kprobes/core.c | 4 +++
> arch/x86/kvm/x86.c | 4 ++-
> arch/x86/lib/insn.c | 34 +++++++++++++++++++++
> tools/arch/x86/include/asm/emulate_prefix.h | 14 +++++++++
> tools/arch/x86/include/asm/insn.h | 6 ++++
> tools/arch/x86/lib/insn.c | 34 +++++++++++++++++++++
> tools/objtool/sync-check.sh | 3 +-
> tools/perf/check-headers.sh | 3 +-
> 12 files changed, 128 insertions(+), 13 deletions(-)
> create mode 100644 arch/x86/include/asm/emulate_prefix.h
> create mode 100644 tools/arch/x86/include/asm/emulate_prefix.h
>
>
> base-commit: 1d72b776f6dc973211f5d153453cf8955fb3d70a
> --
> 2.32.0
>
>
>
>
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>
All now queued up, thanks.
greg k-h
