From: Adrian Hunter <adrian.hunter@intel.com>
To: Mingbo Zhang <whensungoes@gmail.com>, x86@kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Andi Kleen <ak@linux.intel.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
linux-kernel@vger.kernel.org, Yu-cheng Yu <yu-cheng.yu@intel.com>,
Jiri Olsa <jolsa@redhat.com>
Subject: Re: [PATCH] x86: perf: insn: Tweak opcode map for Intel CET instructions
Date: Wed, 25 Mar 2020 08:10:36 +0200 [thread overview]
Message-ID: <06eec783-733c-c8e1-441b-2d25b897485c@intel.com> (raw)
In-Reply-To: <a384009b-0b5d-22da-5613-870c85c546df@intel.com>
On 16/03/20 9:10 am, Adrian Hunter wrote:
> On 3/03/20 9:17 am, Adrian Hunter wrote:
>> On 3/03/20 6:50 am, Mingbo Zhang wrote:
>>> Intel CET instructions are not described in the Intel SDM. When trying to
>>> get the instruction length, the following instructions get wrong (missing
>>> ModR/M byte).
>>>
>>> RDSSPD r32
>>> RSDDPQ r64
>>> ENDBR32
>>> ENDBR64
>>> WRSSD r/m32, r32
>>> WRSSQ r/m64, r64
>>>
>>> RDSSPD/Q and ENDBR32/64 use the same opcode (f3 0f 1e) slot, which is
>>> described in SDM as Reserved-NOP with no encoding characters, and got an
>>> empty slot in the opcode map. WRSSD/Q (0f 38 f6) also got an empty slot.
>>
>> We have patches for that:
>>
>> https://lore.kernel.org/lkml/20200204171425.28073-1-yu-cheng.yu@intel.com/
>>
>> But they have not yet been applied. Arnaldo, could you take them?
>>
>
> Any takers?
>
:-)
next prev parent reply other threads:[~2020-03-25 6:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-03 4:50 Mingbo Zhang
2020-03-03 7:17 ` Adrian Hunter
2020-03-03 7:20 ` Adrian Hunter
2020-03-16 7:10 ` Adrian Hunter
2020-03-25 6:10 ` Adrian Hunter [this message]
2020-03-26 1:31 ` Masami Hiramatsu
2020-03-26 5:09 ` Adrian Hunter
2020-03-26 13:55 ` Arnaldo Carvalho de Melo
2020-03-26 14:19 ` Hunter, Adrian
2020-03-26 14:57 ` Arnaldo Carvalho de Melo
2020-03-26 15:01 ` Arnaldo Carvalho de Melo
2020-03-26 17:36 ` Adrian Hunter
2020-03-26 20:35 ` Arnaldo Carvalho de Melo
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