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Message-ID: <20241121202106.nqybif4yru57wgu3@jpoimboe>
Date: Thu, 21 Nov 2024 12:21:06 -0800
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Valentin Schneider <vschneid@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, kvm@...r.kernel.org, linux-mm@...ck.org,
	bpf@...r.kernel.org, x86@...nel.org, rcu@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Wanpeng Li <wanpengli@...cent.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Andy Lutomirski <luto@...nel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Neeraj Upadhyay <quic_neeraju@...cinc.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Jason Baron <jbaron@...mai.com>, Kees Cook <keescook@...omium.org>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Nicholas Piggin <npiggin@...il.com>,
	Juerg Haefliger <juerg.haefliger@...onical.com>,
	Nicolas Saenz Julienne <nsaenz@...nel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Nadav Amit <namit@...are.com>, Dan Carpenter <error27@...il.com>,
	Chuang Wang <nashuiliang@...il.com>,
	Yang Jihong <yangjihong1@...wei.com>,
	Petr Mladek <pmladek@...e.com>,
	"Jason A. Donenfeld" <Jason@...c4.com>, Song Liu <song@...nel.org>,
	Julian Pidancet <julian.pidancet@...cle.com>,
	Tom Lendacky <thomas.lendacky@....com>,
	Dionna Glaze <dionnaglaze@...gle.com>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	Juri Lelli <juri.lelli@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Yair Podemsky <ypodemsk@...hat.com>,
	Daniel Wagner <dwagner@...e.de>, Petr Tesarik <ptesarik@...e.com>
Subject: Re: [RFC PATCH v3 06/15] jump_label: Add forceful jump label type

On Thu, Nov 21, 2024 at 04:51:09PM +0100, Valentin Schneider wrote:
> Okay so forcing the IPI for .noinstr patching lets us get rid of all the
> force_ipi faff; however I would still want the special marking to tell
> objtool "yep we're okay with this one", and still get warnings when a new
> .noinstr key gets added so we double think about it.

Yeah.  Though, instead of DECLARE_STATIC_KEY_FALSE_NOINSTR adding a new
jump label type, it could just add an objtool annotation pointing to the
key.  If that's the way we're going I could whip up a patch if that
would help.

-- 
Josh

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