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=-9.8 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=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 38B1DC432BE for ; Thu, 19 Aug 2021 12:31:19 +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 01DE460231 for ; Thu, 19 Aug 2021 12:31:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 01DE460231 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=xen.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.168726.308047 (Exim 4.92) (envelope-from ) id 1mGhCN-0000Rp-4G; Thu, 19 Aug 2021 12:31:07 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 168726.308047; Thu, 19 Aug 2021 12:31:07 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mGhCN-0000Rh-1N; Thu, 19 Aug 2021 12:31:07 +0000 Received: by outflank-mailman (input) for mailman id 168726; Thu, 19 Aug 2021 12:31:06 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mGhCM-0000RY-29 for xen-devel@lists.xenproject.org; Thu, 19 Aug 2021 12:31:06 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mGhCL-0007I4-Qu; Thu, 19 Aug 2021 12:31:05 +0000 Received: from [54.239.6.188] (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 1mGhCL-0002kK-Kw; Thu, 19 Aug 2021 12:31:05 +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=AXhWntkWZHYRaUjThPbH7OyGQe8kYQCl69QvAbfyu80=; b=T5JwPFCzpndDKlXXINJf/w/8PG 21StRTuFXb9eMa/d+LfvU2hNbdoKUQiNGndOXLs9ighvfiBpz1PtLXd6mTBV0AHhWyWoHXkqAbLFn CPpPjjaCCK452nx5QNRLjzKjHuVdIibgj7p+TR83kixdkaGoL+KaqLw+zbXzQhah4VCI=; Subject: Re: [PATCH v1 09/14] xen/arm: Add cmdline boot option "pci=on" To: Rahul Singh , xen-devel@lists.xenproject.org Cc: bertrand.marquis@arm.com, Stefano Stabellini , Volodymyr Babchuk References: From: Julien Grall Message-ID: <731afb80-bb68-0c66-4f0f-341a46118770@xen.org> Date: Thu, 19 Aug 2021 13:31:04 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit Hi Rahul, On 19/08/2021 13:02, Rahul Singh wrote: > Add cmdline boot option "pci=on" to enable/disable the PCI init during > boot. I read this as "PCI" will be either disabled/enabled for the platform. Whereas, I think it will be used to decide whether Xen discover PCI and PCI passthrough is supported or not. Can you also clarify why a user would want to select "pci=off"? Cheers, -- Julien Grall