linux-kernel - Re: [PATCH v3 03/10] x86/traps: Decode 0xEA #UD

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Message-ID: <20250219164915.GH34567@noisy.programming.kicks-ass.net>
Date: Wed, 19 Feb 2025 17:49:15 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Andrew Cooper <andrew.cooper3@...rix.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, alyssa.milburn@...el.com,
	scott.d.constable@...el.com, joao@...rdrivepizza.com,
	jpoimboe@...nel.org, jose.marchesi@...cle.com, hjl.tools@...il.com,
	ndesaulniers@...gle.com, samitolvanen@...gle.com, nathan@...nel.org,
	ojeda@...nel.org, kees@...nel.org, alexei.starovoitov@...il.com,
	mhiramat@...nel.org, jmill@....edu
Subject: Re: [PATCH v3 03/10] x86/traps: Decode 0xEA #UD

On Wed, Feb 19, 2025 at 04:47:10PM +0000, Andrew Cooper wrote:
> On 19/02/2025 4:21 pm, Peter Zijlstra wrote:
> > FineIBT will start using 0xEA as #UD
> >
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> 
> FINEIBT probably ought to gain a "depends on X86_64" too, or this is
> going to go wrong in a very fun way.

It already is:

config X86_KERNEL_IBT
        depends on X86_64 && CC_HAS_IBT && HAVE_OBJTOOL


Nobody wants to touch i386 if they don't have to :-)