linux-kernel - Re: [PATCH] x86: XOP prefix instructions decoder support

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Message-ID: <20250817114734.42e17904@frodo.int.wylie.me.uk>
Date: Sun, 17 Aug 2025 11:47:34 +0100
From: "Alan J. Wylie" <alan@...ie.me.uk>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>, Thomas Gleixner
 <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov
 <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 linux-kernel@...r.kernel.org, regressions@...ts.linux.dev,
 stable@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org>,
 x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86: XOP prefix instructions decoder support

On Sun, 17 Aug 2025 09:32:40 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> Hi Alan, 
> 
> Can you test this with our cros-compile build?
> 
> Thank you,

Applies cleanly to both 6.16.0 and 6.16.1, builds natively on both on
my FX-8350 box and boots successfully on both.

Tested-by: Alan J. Wylie <alan@...ie.me.uk>

Thanks

Alan.

> 
> On Wed, 30 Jul 2025 16:46:52 +0900
> "Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:
> 
> > From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> > 
> > Support decoding AMD's XOP prefix encoded instructions.
> > 
> > These instructions are introduced for Bulldozer micro architecture,
> > and not supported on Intel's processors. But when compiling kernel
> > with CONFIG_X86_NATIVE_CPU on some AMD processor (e.g. -march=bdver2),
> > these instructions can be used.
> > 
> > Reported-by: Alan J. Wylie <alan@...ie.me.uk>
> > Closes: https://lore.kernel.org/all/871pq06728.fsf@wylie.me.uk/
> > Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> > ---
> >  arch/x86/include/asm/inat.h                        |   15 +++
> >  arch/x86/include/asm/insn.h                        |   51 +++++++++
> >  arch/x86/lib/inat.c                                |   13 ++
> >  arch/x86/lib/insn.c                                |   35 +++++-
> >  arch/x86/lib/x86-opcode-map.txt                    |  111 ++++++++++++++++++++
> >  arch/x86/tools/gen-insn-attr-x86.awk               |   44 ++++++++
> >  tools/arch/x86/include/asm/inat.h                  |   15 +++
> >  tools/arch/x86/include/asm/insn.h                  |   51 +++++++++
> >  tools/arch/x86/lib/inat.c                          |   13 ++
> >  tools/arch/x86/lib/insn.c                          |   35 +++++-
> >  tools/arch/x86/lib/x86-opcode-map.txt              |  111 ++++++++++++++++++++
> >  tools/arch/x86/tools/gen-insn-attr-x86.awk         |   44 ++++++++
> >  .../util/intel-pt-decoder/intel-pt-insn-decoder.c  |    2 
> >  13 files changed, 513 insertions(+), 27 deletions(-)

-- 
Alan J. Wylie     https://www.wylie.me.uk/     mailto:<alan@...ie.me.uk>

Dance like no-one's watching. / Encrypt like everyone is.
Security is inversely proportional to convenience