From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C0EAC13C3D6 for ; Fri, 22 Nov 2024 10:17:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732270667; cv=none; b=HAzyRlixg/7kVfYVClNhtIa5ivFzaYBtuyanh1JONSOwZF196wrVj5tJb4qpDPFiGWAZyfd5IdjGTZdW0VxDdA4gFQOXgS+xsz8V51Xhm3gE2iuNS52ipvyqg9d9AX5o4gdOk6beQ/SfrWVkDbPpbFiqNzr0nDeJvjSoxo3y5u0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732270667; c=relaxed/simple; bh=XUuo/u7cK5K5gY/dFgAwCjVRAIBZqBeX+BIxJiAEQkY=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=uYJY/MMo8JqtFU2w1pdWoKlwuZcc3GxCvDJBGvqlRpw03DZX7j4r42EZBQs5ykw3nzvOgUX/IcZnR9PyNhTUl+vKlkRibaJ6JZLqlrvZoxzJ3S2VkwQ8bo2bwbuTk2hdjD3zFj44v29Qt1IoMUshub6hCCGkfLl8+WbMP/y/YLM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=RmdSJ0iF; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="RmdSJ0iF" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732270664; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=69DVKh9DUZx0Pn4NM7TlxBgCo8xRovdMM0JkhaNwI8A=; b=RmdSJ0iFkYWDqYT/nWQdylr5lxytCZyfYY0A9Tx855o06aD9rEBHQ0kRZUtw/GeNI47O6l 3VBWDRHiZETHfnhI+0f58qJR3GdcsQjITevTw5StXkqkKVsaEXJZYHyS7RtYrBgjVNuxdp y76RiYTMHY+ocrxxdWfYT20yTh9XpZM= Received: from mail-yw1-f200.google.com (mail-yw1-f200.google.com [209.85.128.200]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-657-KCNHyuioP1yB5YxR80C8Yg-1; Fri, 22 Nov 2024 05:17:43 -0500 X-MC-Unique: KCNHyuioP1yB5YxR80C8Yg-1 X-Mimecast-MFC-AGG-ID: KCNHyuioP1yB5YxR80C8Yg Received: by mail-yw1-f200.google.com with SMTP id 00721157ae682-6ee57ae1133so26684327b3.0 for ; Fri, 22 Nov 2024 02:17:43 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732270663; x=1732875463; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=69DVKh9DUZx0Pn4NM7TlxBgCo8xRovdMM0JkhaNwI8A=; b=HuV8fYAZh+7OGL4IwtvDf6rgJF9HdgSWR8iqZR1pf5jy62Yn2jsd27auvmewo8uedH +UwPcg+Ek3cwg/zSr6pGhNBs5Yi02/dF34E4TQL2j4HNtqMXmNUavCWjxqMOvSyap132 Rh730q2djm9nLA99tQGE5tHGtM1lB1fJjqcLs0h1rj1BFItBwRlQmQZMjBQD3Z9dg+da h8Q5ZVjrmvYi26soD0i0l292ES0gL2c9TMHK7V25A4l0MJbFNxqShDNLXphfXrgC4U9j P5E01EfjD8Y0g6LaYUBH9Tp0BrDTMQGedxBS0X0edduftcL3ibCSPTMiDzl6+LCpvqUj rqHg== X-Forwarded-Encrypted: i=1; AJvYcCUWsNoAlQUWm2VrY976OYsXrXxuz6BQng7dNc7bXCDOCxtz7X332UCEyrB1LI1s/kK+Qp1DKazpCvo=@vger.kernel.org X-Gm-Message-State: AOJu0YzmrzIJc0S0814bnQdtKsCWyxV2TMdcZAebmxxauWeg8dZxuugu 8k8ucOD5vFaF04pntHv+voNsMiROXVKT2fkxnRFiXA/wzceNGiW0KPAVMzeTOzyzYEf3wmtGnAw Z7Mx/wHuAFiIbvuT/zY/oB3A14k5jCvGDU9fniRTmiR1Qw8MIuTRMQj6q5A== X-Gm-Gg: ASbGncu58IAPzyW1ruuXvjYylO5Glac4CdVPIuLVBPzVXr1w95sEVZIfOCugufWaYKO 5ADVhnc7y3DW3wozrEWLKb0/2NEgglOpaHgjeyWBdqAxO6T+Hr6BfT2NC/1LIQ+fZutLKu54MtM ItssxP14FIZEa2VZw2bJBbCrGu8ZcV+WDxtm2Amfs15GdroZLyasWdTKP5cQ4FRUrkSYavBpFF/ 1uc0nJgaLt3UpX2BNufr0E24eAF+7eHcmzreZLTTSu1TVOYed6t+MgmpbW7oTd+4IeLJf+G5dAn 8aF5wJ7FIr7mx8rr4WGpF5dnGtCRoXlK6E8= X-Received: by 2002:a05:690c:4b8f:b0:6e2:a129:1623 with SMTP id 00721157ae682-6eee0a4e7cbmr23805687b3.38.1732270663049; Fri, 22 Nov 2024 02:17:43 -0800 (PST) X-Google-Smtp-Source: AGHT+IGzjL7GOb26N8xVdZoDD0aeetdAAWaPf+1MRvyDFWpPzlOuVttoePPk8DAQ//wEdbZj+zzG2Q== X-Received: by 2002:a05:690c:4b8f:b0:6e2:a129:1623 with SMTP id 00721157ae682-6eee0a4e7cbmr23805387b3.38.1732270662779; Fri, 22 Nov 2024 02:17:42 -0800 (PST) Received: from vschneid-thinkpadt14sgen2i.remote.csb (213-44-141-166.abo.bbox.fr. [213.44.141.166]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7b513f91e8esm72637485a.2.2024.11.22.02.17.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Nov 2024 02:17:41 -0800 (PST) From: Valentin Schneider To: Josh Poimboeuf Cc: Peter Zijlstra , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, x86@kernel.org, rcu@vger.kernel.org, linux-kselftest@vger.kernel.org, Steven Rostedt , Masami Hiramatsu , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Andy Lutomirski , Frederic Weisbecker , "Paul E. McKenney" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , Lorenzo Stoakes , Jason Baron , Kees Cook , Sami Tolvanen , Ard Biesheuvel , Nicholas Piggin , Juerg Haefliger , Nicolas Saenz Julienne , "Kirill A. Shutemov" , Dan Carpenter , Chuang Wang , Yang Jihong , Petr Mladek , "Jason A. Donenfeld" , Song Liu , Julian Pidancet , Tom Lendacky , Dionna Glaze , Thomas =?utf-8?Q?Wei=C3=9Fschuh?= , Juri Lelli , Marcelo Tosatti , Yair Podemsky , Daniel Wagner , Petr Tesarik Subject: Re: [RFC PATCH v3 06/15] jump_label: Add forceful jump label type In-Reply-To: <20241121202106.nqybif4yru57wgu3@jpoimboe> References: <20241119153502.41361-1-vschneid@redhat.com> <20241119153502.41361-7-vschneid@redhat.com> <20241119233902.kierxzg2aywpevqx@jpoimboe> <20241120145649.GJ19989@noisy.programming.kicks-ass.net> <20241120145746.GL38972@noisy.programming.kicks-ass.net> <20241120165515.qx4qyenlb5guvmfe@jpoimboe> <20241121110020.GC24774@noisy.programming.kicks-ass.net> <20241121202106.nqybif4yru57wgu3@jpoimboe> Date: Fri, 22 Nov 2024 11:17:33 +0100 Message-ID: Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On 21/11/24 12:21, Josh Poimboeuf wrote: > 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. > Well I'm down for the approach and I'd appreciate help for the objtool side :-) > -- > Josh