From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13F0AC5DF60 for ; Fri, 8 Nov 2019 11:11:54 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D400F206BA for ; Fri, 8 Nov 2019 11:11:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="HB1DHe1K" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D400F206BA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:52486 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iT2BF-00053e-1M for qemu-devel@archiver.kernel.org; Fri, 08 Nov 2019 06:11:53 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:58546) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iT2AX-0004b2-Gw for qemu-devel@nongnu.org; Fri, 08 Nov 2019 06:11:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iT2AW-0001H2-AB for qemu-devel@nongnu.org; Fri, 08 Nov 2019 06:11:09 -0500 Received: from mail-oi1-x241.google.com ([2607:f8b0:4864:20::241]:36212) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1iT2AW-0001GH-34 for qemu-devel@nongnu.org; Fri, 08 Nov 2019 06:11:08 -0500 Received: by mail-oi1-x241.google.com with SMTP id j7so4912768oib.3 for ; Fri, 08 Nov 2019 03:11:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=rbgVhZXxnZswzCulD42asmbDN5pH5nEu/3r6neC03hM=; b=HB1DHe1KzU+F4lUuNRYpF9EMnMt6h+7mWgW+kzDp6bhaTiCMM74X+Tb9fnIcV8+4X1 y1Bgg0ldMnD2bXvIBWgMXFXrV7+ooo1Xot/c5Lp27suOlbfPl+KPTsQuwyeCcme3cr0I 9+okESUMv6vVEyxzQK23P7BuZhc3m8MasUN7bn+EGPAYcHNs9HczGErDdNDKrvJGqs5N Ln7ppqF8nUEtNhNMC39T7j358OiyGIA8qIz00KG8AHArIxruHSRKflZD1pslUiWntN4e 097aBJ4TDg0DpFCAyLWRVhGu0wiRU3iyrWy4IPs/rakzwnB5LkCkZ2QRm9eQcCJr3TEv RY5Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=rbgVhZXxnZswzCulD42asmbDN5pH5nEu/3r6neC03hM=; b=XutRqwhIVadCNjHzDy/7CyvCta+siEyifro0J+KfrlI+3Ea+/B3RFVvkUYiVYrv9eH iZvTlXeZbjvJJlHNFtLNXV/a3rOEFc8H3Z9h9RNGJkYTdhydovpjKbFknomtGlJ5wlQi Lhx3sLFnUcNUNIZ7LxCQcuXWnqftT69rxOqawd16h4Xehyi0eYJaDpq4Phqa2oR/sZ32 T86RcG1uywF7D6IT+zgJQzZTZCrf3FyhOodrDa/ighCiXDC861urxaEF7FPt2t4LCGXY HwqQ+wXHl54Y3JEPwx7eV4D2hWDRRLEE0rYu7tFF5qF8qF0JG5gwXjtxUahBEUYl6PbW OpEA== X-Gm-Message-State: APjAAAXP8ePc6bmqxbDqVLmw0DQEBrrNGmJf5KK6E5ECQoqhwpvPJZby Wr++elbcOgGgoxdVioNQsC7KrW61DV+WtDthahZUag== X-Google-Smtp-Source: APXvYqwqohUzP34s9UyxRmIjzW+FL6h+tpC8/sYqMWwgs7RCVe3v+Abr9DvKdh1RIIOrLieqZes41xM9u/aBqHm0Vx4= X-Received: by 2002:a05:6808:7d1:: with SMTP id f17mr9262112oij.163.1573211466909; Fri, 08 Nov 2019 03:11:06 -0800 (PST) MIME-Version: 1.0 References: <20191108110714.7475-1-david@redhat.com> In-Reply-To: <20191108110714.7475-1-david@redhat.com> From: Peter Maydell Date: Fri, 8 Nov 2019 11:10:55 +0000 Message-ID: Subject: Re: [PATCH v1 0/2] s390x/cpumodel: Introduce "best" model variants To: David Hildenbrand Content-Type: text/plain; charset="UTF-8" X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::241 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Huth , =?UTF-8?Q?Daniel_P_=2E_Berrang=C3=A9?= , Janosch Frank , Cornelia Huck , Richard Henderson , QEMU Developers , Markus Armbruster , Halil Pasic , Christian Borntraeger , qemu-s390x , Michael Mueller , Jiri Denemark , Eduardo Habkost Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, 8 Nov 2019 at 11:08, David Hildenbrand wrote: > > There was recently a discussion regarding CPU model versions. That concept > does not fit s390x where we have a lot of feature variability. I > proposed an alternative approach in [1], which might work for x86 as well > (but I am not sure if x86 still can or wants to switch to that), and > requires no real changes in upper layers. > > [1] and patch #2 contains more information on the motivation for this. > > E.g., specifying/expanding "z14-best" will result in the "best feature > set possible on this accelerator, hw and, firmware". While a "z13" does > not work under TCG and some z/VM versions, "z13-best" will work. I think other architectures call this concept "max", not "best". If we can manage some cross-architecture consistency that would be helpful, but is s390x using 'max' already for something else? thanks -- PMM