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=-7.2 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 57A58C47089 for ; Thu, 27 May 2021 12:30:00 +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 1538B613C3 for ; Thu, 27 May 2021 12:30:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1538B613C3 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.133076.248126 (Exim 4.92) (envelope-from ) id 1lmF8l-0000or-HS; Thu, 27 May 2021 12:29:31 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 133076.248126; Thu, 27 May 2021 12:29:31 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lmF8l-0000ok-EO; Thu, 27 May 2021 12:29:31 +0000 Received: by outflank-mailman (input) for mailman id 133076; Thu, 27 May 2021 12:29:30 +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 1lmF8k-0000oe-Iw for xen-devel@lists.xenproject.org; Thu, 27 May 2021 12:29:30 +0000 Received: from smtp-out1.suse.de (unknown [195.135.220.28]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id cd4d9319-174f-405d-90c9-e07212ec942f; Thu, 27 May 2021 12:29:29 +0000 (UTC) Received: from imap.suse.de (imap-alt.suse-dmz.suse.de [192.168.254.47]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 6E11A218DD; Thu, 27 May 2021 12:29:28 +0000 (UTC) Received: from director2.suse.de (director2.suse-dmz.suse.de [192.168.254.72]) by imap.suse.de (Postfix) with ESMTPSA id 519A811A98; Thu, 27 May 2021 12:29:28 +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: cd4d9319-174f-405d-90c9-e07212ec942f DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1622118568; 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=SCWyRvE5JWWIQWwVbsGK4b5GWaY4O0M7tRlh4MgyuhQ=; b=Ybv5HTYupYzbJGPQQZqnq2teQyO+mx4GOh52O4k5zJPr+8SgDHx6GFMIpilgmRfZhCP/Qy xtTklwQgNbFVm58D9mjm9T1TpPohwyLwsC9kYwWYgUBYyM410XktLFlk+wlQ7zTPevTwMe HgOWNilQRCqsVVY0zQc/nkhaBhaZifk= From: Jan Beulich Subject: [PATCH v2 00/12] x86: memcpy() / memset() (non-)ERMS flavors plus fallout Cc: Andrew Cooper , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= To: "xen-devel@lists.xenproject.org" Message-ID: <8f56a8f4-0482-932f-96a9-c791bebb4610@suse.com> Date: Thu, 27 May 2021 14:29:21 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit While the performance varies quite a bit on older (pre-ERMS) and newer (ERMS) hardware, so far we've been going with just a single flavor of these two functions, and oddly enough with ones not consistent with one another. Using plain memcpy() / memset() on MMIO (video frame buffer) is generally okay, but the ERMS variant of memcpy() turned out to regress (boot) performance in a way easily visible to the human eye. Hence as a prerequisite step this series switches the frame buffer (and VGA) mapping to be write-combining independent of firmware arrangements (of MTRRs in particular). v2, besides addressing review feedback not addressed verbally, extends things to - driving gcc's inlining of __builtin_mem{cpy,set}(), - page clearing and scrubbing. 01: x86: introduce ioremap_wc() 02: x86: re-work memset() 03: x86: re-work memcpy() 04: x86: control memset() and memcpy() inlining 05: x86: introduce "hot" and "cold" page clearing functions 06: page-alloc: make scrub_on_page() static 07: mm: allow page scrubbing routine(s) to be arch controlled 08: x86: move .text.kexec 09: video/vesa: unmap frame buffer when relinquishing console 10: video/vesa: drop "vesa-mtrr" command line option 12: video/vesa: adjust (not just) command line option handling Side note: While strictly speaking the xen/drivers/video/ changes fall under REST maintainership, with that code getting built for x86 only I'm restricting Cc-s to x86 maintainers. Jan