From patchwork Fri Jan 29 16:18:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Beulich X-Patchwork-Id: 12056013 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=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 8AACDC433DB for ; Fri, 29 Jan 2021 16:18:28 +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 1E12364DF1 for ; Fri, 29 Jan 2021 16:18:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1E12364DF1 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.78282.142347 (Exim 4.92) (envelope-from ) id 1l5WTT-0006la-76; Fri, 29 Jan 2021 16:18:19 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 78282.142347; Fri, 29 Jan 2021 16:18:19 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l5WTT-0006lT-3l; Fri, 29 Jan 2021 16:18:19 +0000 Received: by outflank-mailman (input) for mailman id 78282; Fri, 29 Jan 2021 16:18:18 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l5WTS-0006lN-5M for xen-devel@lists.xenproject.org; Fri, 29 Jan 2021 16:18:18 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 2b871c59-35ee-4a90-a9ac-9fed7edcb252; Fri, 29 Jan 2021 16:18:16 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 13600B040; Fri, 29 Jan 2021 16:18:16 +0000 (UTC) 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" X-Inumbo-ID: 2b871c59-35ee-4a90-a9ac-9fed7edcb252 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=1611937096; 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; bh=4tl2B4/R4z5tsFJOc+Ea0sZDAe96QRFUT5zDSpZqvLE=; b=py4LSeWjkSIQf64rZGGTBjmloFSGe5GYUc83zF9e3a1IUQlp84J0hv+4khqBK2GZRr93zX MhOcBzCJ0ZLJK0fgwyQdSkCajHepXQl/OLGMRKOxyF6EXx02+b17QUav/Lubf+/vWf4M+N xXtcyvMEQVL62LfC1XAgxPufmxaA3PU= To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?utf-8?q?Roger_Pau_Monn=C3=A9?= From: Jan Beulich Subject: [PATCH 0/2] x86/time: calibration rendezvous adjustments Message-ID: <35443b5a-1410-7099-a937-e9f537bbe989@suse.com> Date: Fri, 29 Jan 2021 17:18:16 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 Content-Language: en-US The 2nd patch (RFC for now) is meant to address a regression reported on the list under "Problems with APIC on versions 4.9 and later (4.8 works)". In the course of analyzing output from a debugging patch I ran into another anomaly again, which I thought I should finally try to address. Hence patch 1. 1: change initiation of the calibration timer 2: don't move TSC backwards in time_calibration_tsc_rendezvous() Jan