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,URIBL_BLOCKED,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 36B31C4361A for ; Fri, 4 Dec 2020 08:52:50 +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 BD78122795 for ; Fri, 4 Dec 2020 08:52:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BD78122795 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.44148.79143 (Exim 4.92) (envelope-from ) id 1kl6pI-0006Co-FX; Fri, 04 Dec 2020 08:52:28 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 44148.79143; Fri, 04 Dec 2020 08:52:28 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kl6pI-0006Ch-B3; Fri, 04 Dec 2020 08:52:28 +0000 Received: by outflank-mailman (input) for mailman id 44148; Fri, 04 Dec 2020 08:52:27 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kl6pH-0006Cc-GP for xen-devel@lists.xenproject.org; Fri, 04 Dec 2020 08:52:27 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kl6pG-00047b-AA; Fri, 04 Dec 2020 08:52:26 +0000 Received: from [54.239.6.186] (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 1kl6pG-00080R-22; Fri, 04 Dec 2020 08:52:26 +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=rA7cUkEhzOwYWHpkZlKG9tDLVRXBLDbhvxlPgKDSKcE=; b=se5/V9eA0JPLOii9tZzHK6ikeX ze3PtCW1c+Bo1Vg+QxrtkT+/pWMvFu8dWOnwKiVW1jTjXP08VBpwiC+pEch0PSx9J9KER7eholhaP MZA55J7w7T0GeBjAOkF1jQJ3pLCfGtAMXoIteP39J8QKnXVwH1HMKG3bUU/ryjWwNOqY=; Subject: Re: [PATCH v2 3/8] xen/arm: revert patch related to XArray To: Rahul Singh Cc: "xen-devel@lists.xenproject.org" , Bertrand Marquis , Stefano Stabellini , Volodymyr Babchuk References: <612c1adabc1c26a539abf0dc05ea20b51e66e85f.1606406359.git.rahul.singh@arm.com> <266b918c-b9c4-e067-b8dc-4e879c913af5@xen.org> <2B1A7090-F07C-4DF9-BDEC-6E5A2D715DB4@arm.com> From: Julien Grall Message-ID: <0f59af9e-b639-5a79-2227-bb6d18270fcd@xen.org> Date: Fri, 4 Dec 2020 08:52:24 +0000 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.5.1 MIME-Version: 1.0 In-Reply-To: <2B1A7090-F07C-4DF9-BDEC-6E5A2D715DB4@arm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit On 03/12/2020 12:57, Rahul Singh wrote: > Hello Julien, Hi, >> On 2 Dec 2020, at 1:46 pm, Julien Grall wrote: >> >> Hi Rahul, >> >> On 26/11/2020 17:02, Rahul Singh wrote: >>> XArray is not implemented in XEN revert the patch that introduce the >>> XArray code in SMMUv3 driver. >> >> Similar to the atomic revert, you are explaining why the revert but not the consequences. I think this is quite important to have them outline in the commit message as it looks like it means the SMMU driver would not scale. > > Ok I will add. >> >>> Once XArray is implemented in XEN this patch can be added in XEN. >> >> What's the plan for that? > > As of now there is no plan for Xarray from our side. > Do we have requirement for Xarray implementation in XEN ? That's going to depend on the consequence of reverting this patch. Cheers, -- Julien Grall