From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.alien8.de (mail.alien8.de [65.109.113.108]) (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 2C9E0328243 for ; Fri, 25 Sep 2026 04:26:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=65.109.113.108 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790310399; cv=none; b=YsB4gpib+sSKQ6zKS4caCrSa9iO+XdAWF4LtVNy9J8wjLZd7f31J1bu/Cn2P5bMXsfK/I9M/FqPxtbFBNsj9XLDndNXli3hbdu00FuWyviVBnBnFNB8Mxz7DP7StU6ozfGa+IYos3zwFYlKdt9wEVS0HRKhgzpl0cbe5AeTpIeo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790310399; c=relaxed/simple; bh=vTVnsFHi33mKzHxrGwVxs+FLhFe/ItxIns9KWPIkoaw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=fMFOramQYY3AUFMWNAQ0vGjRpB36/7ScR+r21I1Ut+RQLFDPnKANMDeMVI9sEIhL7T5NlKlMMWVULTB5mx56B8Elfl9FYGzc52B0nydTj1a/QqEWSoRuvYgf+bVRLbj7xG5IH0sw1/wHPWkR6l8+BCazWD7B6nMlSWLxdRAch1E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=alien8.de; spf=pass smtp.mailfrom=alien8.de; dkim=pass (4096-bit key) header.d=alien8.de header.i=@alien8.de header.b=ggj2MpzZ; arc=none smtp.client-ip=65.109.113.108 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=alien8.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=alien8.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (4096-bit key) header.d=alien8.de header.i=@alien8.de header.b="ggj2MpzZ" Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id CA49340E021A; Fri, 25 Sep 2026 04:26:35 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.alien8.de Authentication-Results: mail.alien8.de (amavisd-new); dkim=pass (4096-bit key) header.d=alien8.de Received: from mail.alien8.de ([127.0.0.1]) by localhost (mail.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id LUCJMrBFnGow; Fri, 25 Sep 2026 04:26:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1790310386; bh=Er77sK8JNES8ATomcjAqegFp4wapOXQn1wFhZr1PS/I=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ggj2MpzZLhKYK7dOsM0wOoMiKXnr6clEK7bfMY8HRVpMqL9ZYpTFKPJeUSizaeDEl gFfIWK2JvhwFaReI1Wx4Xq9EL9B5IBdNo73VKVK0J5dRaNxN/sMYESji/9WIMaGLFH sAdwVNE5/PRC2MtdBkUjNhBQALAg/Ns82Cvx6pmtvOh17O6WneF9kVK/C62wBc1I07 6fbSBdU/8BUBPNIdaNqZYbmcvUZ9cRTitGzcXqxHVuenPslsbws0Ezu3FrReJxpbCQ iNTcxos/5wxoybVejUBz8DxUzjeCWaH/gvxedxv7kQk3nXQ39KvZzoelC8Ated8tOL SYJT9bc3bWz96HN+QWAP1Qw9BC0oZ0OENm9nGnyovFFKQ5tLJRfzpwtJVfircR9W6C TKDn6M0d2MEfaYk2wh5hpp2+zKaP2cMECmOel2DMCAQcFV3lzOd/yfYfR9ZhZKgtM8 2+hhPJ4spg5bYSxyCa+o3g9Kop4Pn6YOqzoaLmFvx95/NBuemRVJfg4Rhqd3rdMa+V rlOLvDfia6ho9xAtMA3zhtKL1iV0ocSQkS8MyYMvKcS6Nz+oHkEqdfTYm156pxRnVm tFhTyS43P9Mg94/9P5CCpHshrCQbZEa7tLC4PSJ8cclyZAtTmVJXIPeE+zW34Deov8 H/P5fcNruEJj54cuyeGsvoWI= Received: from stx.tnic (unknown [IPv6:2600:1700:38ca:c00::42]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 5CBBA40E00B9; Fri, 25 Sep 2026 04:26:15 +0000 (UTC) Date: Thu, 24 Sep 2026 21:26:12 -0700 From: Borislav Petkov To: Naveen N Rao Cc: Dave Hansen , linux-kernel@vger.kernel.org, x86@kernel.org, Thomas Gleixner , Ingo Molnar , Bharata B Rao , Manali Shukla , Nikunj A Dadhania , "H. Peter Anvin" Subject: Re: [PATCH RESEND v4 2/3] x86/apic: Introduce a variable to track the number of EILVT registers Message-ID: <20260925042612.GCarX35LHhl65JavXf@fat_crate.local> References: <99275fc7531b5c8708e2be8459251c9169b0ce63.1788425679.git.naveen@kernel.org> <20260922053610.GBarITypxf7zPAB83g@fat_crate.local> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: On Thu, Sep 24, 2026 at 05:28:48PM +0530, Naveen N Rao wrote: > Cause I didn't want to risk changing the current default EILVT register > count for some ~2 decade old processor that may be advertising > X86_FEATURE_EXTAPIC but encoding a count of zero in APIC_EFEAT. Do you know of such a processor? Because Christian gave you all regs count from K8 onwards and that's what we support anyway. I don't care about K7 rust and older. > Right, the split reflects how I viewed the changes, and to hopefully > simplify the review. Looks like I got the split wrong as it looks to > have been counter-productive here. Right, just keep it simple and do a single patch. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette