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=-12.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham 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 AD8FDC56202 for ; Mon, 23 Nov 2020 13:58:26 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 3FA3E20781 for ; Mon, 23 Nov 2020 13:58:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="jz6QdI5G" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3FA3E20781 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.34395.65412 (Exim 4.92) (envelope-from ) id 1khCM8-0003l9-R6; Mon, 23 Nov 2020 13:58:12 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 34395.65412; Mon, 23 Nov 2020 13:58:12 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khCM8-0003l2-Nj; Mon, 23 Nov 2020 13:58:12 +0000 Received: by outflank-mailman (input) for mailman id 34395; Mon, 23 Nov 2020 13:58:11 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khCM7-0003kw-Ri for xen-devel@lists.xenproject.org; Mon, 23 Nov 2020 13:58:11 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id a2e01039-815e-46a7-9af3-aec410442773; Mon, 23 Nov 2020 13:58:11 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 4F319ABE4; Mon, 23 Nov 2020 13:58:10 +0000 (UTC) Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khCM7-0003kw-Ri for xen-devel@lists.xenproject.org; Mon, 23 Nov 2020 13:58:11 +0000 X-Inumbo-ID: a2e01039-815e-46a7-9af3-aec410442773 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id a2e01039-815e-46a7-9af3-aec410442773; Mon, 23 Nov 2020 13:58:11 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1606139890; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/lYFTUsX+0/pVFdYdfVYe2ygcWjaAE030Av5jYiLRLo=; b=jz6QdI5Gq1MJXVHRM7slJ0g3kxMEzsYtmzRJeCKv69fzH1Mwc2nkgm2Jvk9CLx7C2m+/k/ gl3bOz8P55EqBKd7KlEF2Xi3JFutARu9bmxNUt6ZAX1gmDSiD8025681w/YSf6fnliNTa+ C1y5A2qjsSCnd5taDaaoPCV+hJuqLWY= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 4F319ABE4; Mon, 23 Nov 2020 13:58:10 +0000 (UTC) Subject: Re: [PATCH] libxg: don't use max policy in xc_cpuid_xend_policy() To: Andrew Cooper Cc: "xen-devel@lists.xenproject.org" , Ian Jackson , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Wei Liu References: <4fa05759-24ac-5ff3-3db9-94537f6be95d@suse.com> <20201106155839.vnhdqcptbpkbzfly@liuwe-devbox-debian-v2> From: Jan Beulich Message-ID: Date: Mon, 23 Nov 2020 14:58:09 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <20201106155839.vnhdqcptbpkbzfly@liuwe-devbox-debian-v2> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit On 06.11.2020 16:58, Wei Liu wrote: > On Thu, Nov 05, 2020 at 04:56:53PM +0100, Jan Beulich wrote: >> Using max undermines the separation between default and max. For example, >> turning off AVX512F on an MPX-capable system silently turns on MPX, >> despite this not being part of the default policy anymore. Since the >> information is used only for determining what to convert 'x' to (but not >> to e.g. validate '1' settings), the effect of this change is identical >> for guests with (suitable) "cpuid=" settings to that of the changes >> separating default from max and then converting (e.g.) MPX from being >> part of default to only being part of max for guests without (affected) >> "cpuid=" settings. >> >> Signed-off-by: Jan Beulich > > I will defer this to Andrew. Andrew? Thanks, Jan