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=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,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 D7710C64E7C for ; Wed, 2 Dec 2020 13:45:24 +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 62174221FB for ; Wed, 2 Dec 2020 13:45:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 62174221FB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=xen.org 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.42732.76892 (Exim 4.92) (envelope-from ) id 1kkSRD-0005VV-0D; Wed, 02 Dec 2020 13:44:55 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 42732.76892; Wed, 02 Dec 2020 13:44:54 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kkSRC-0005VO-TC; Wed, 02 Dec 2020 13:44:54 +0000 Received: by outflank-mailman (input) for mailman id 42732; Wed, 02 Dec 2020 13:44:53 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kkSRB-0005VD-Ca for xen-devel@lists.xenproject.org; Wed, 02 Dec 2020 13:44:53 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kkSR9-0001vV-WD; Wed, 02 Dec 2020 13:44:52 +0000 Received: from [54.239.6.187] (helo=a483e7b01a66.ant.amazon.com) by xenbits.xenproject.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1kkSR9-0007Jk-QY; Wed, 02 Dec 2020 13:44:51 +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" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:Cc:To:Subject; bh=CUjdfLZFOHaD7kprNnefbGcLGRXfJc7JyVO7qhIJrUc=; b=7Nb5ACfpFlhbGWk7pCeqaylrMX ON7CC9R+GuRUDH0vEVtvMfH9SBtkSzcdMvbOP7HCzmORubkj2KtZet1wmK+3LXElYxPNg2PD2KEWD 1ZEiqAlMx9hpgo53KYk7uDKyjWjSyzfqZVJw228Wqmm67eZJPfRTYNbRpOXIMrrCjFsE=; Subject: Re: [PATCH v2 2/8] xen/arm: revert atomic operation related command-queue insertion patch To: Rahul Singh , xen-devel@lists.xenproject.org Cc: bertrand.marquis@arm.com, Stefano Stabellini , Volodymyr Babchuk References: <4a0ca6d03b5f1f5b30c4cdbdff0688cea84d9e91.1606406359.git.rahul.singh@arm.com> From: Julien Grall Message-ID: <39a9c619-d7b2-eca0-688c-5f35546e59fa@xen.org> Date: Wed, 2 Dec 2020 13:44:49 +0000 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <4a0ca6d03b5f1f5b30c4cdbdff0688cea84d9e91.1606406359.git.rahul.singh@arm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit Hi Rahul, On 26/11/2020 17:02, Rahul Singh wrote: > Linux SMMUv3 code implements the commands-queue insertion based on > atomic operations implemented in Linux. Atomic functions used by the > commands-queue insertion is not implemented in XEN therefore revert the > patch that implemented the commands-queue insertion based on atomic > operations. This commit message explains why we revert but not the consequence of the revert. Can outline if there are any and why they are fine? I am also interested to have a list of *must* have for the driver to be out of the tech preview. Cheers, -- Julien Grall