From: "H. Peter Anvin" <hpa@zytor.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org, kees@kernel.org, alyssa.milburn@intel.com,
scott.d.constable@intel.com, joao@overdrivepizza.com,
samitolvanen@google.com, nathan@kernel.org,
alexei.starovoitov@gmail.com, mhiramat@kernel.org,
ojeda@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH] x86,ibt: Use UDB instead of 0xEA
Date: Fri, 15 Aug 2025 10:14:57 -0700 [thread overview]
Message-ID: <78bd985a-a59e-4469-a84d-a0eb7faa20c3@zytor.com> (raw)
In-Reply-To: <055f4c2b-0e7f-44ae-92ff-a1025a217208@citrix.com>
On 2025-08-15 04:19, Andrew Cooper wrote:
>>
>> CS Jcc, decodes to Jcc,pn for non-taken
>> DS Jcc, decodes to Jcc,pt for taken
>
> Ah, thanks. I was looking at the hex in one of the comments and still
> couldn't figure it out.
>
> So with this notation, we also have the dual meaning of ,pt between the
> P4 and LNC. At least the encoding is the same.
>
What "dual meaning?"
-hpa
next prev parent reply other threads:[~2025-08-15 17:15 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-14 11:17 [RFC][PATCH] x86,ibt: Use UDB instead of 0xEA Peter Zijlstra
2025-08-14 11:23 ` Peter Zijlstra
2025-08-14 19:40 ` Nathan Chancellor
2025-08-15 1:27 ` H. Peter Anvin
2025-08-15 7:49 ` Peter Zijlstra
2025-08-15 10:28 ` Peter Zijlstra
2025-08-15 10:30 ` Peter Zijlstra
2025-08-15 10:43 ` Andrew Cooper
2025-08-15 10:59 ` Peter Zijlstra
2025-08-15 11:19 ` Andrew Cooper
2025-08-15 17:14 ` H. Peter Anvin [this message]
2025-08-15 17:21 ` Andrew Cooper
2025-08-15 17:28 ` H. Peter Anvin
2025-08-15 5:42 ` Alexei Starovoitov
2025-08-15 7:57 ` Peter Zijlstra
2025-08-15 8:28 ` Leon Hwang
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