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 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E154CCCA473 for ; Thu, 9 Jun 2022 07:54:43 +0000 (UTC) Received: from localhost ([::1]:54714 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nzD06-0002M2-Pk for qemu-devel@archiver.kernel.org; Thu, 09 Jun 2022 03:54:42 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54652) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nzCwH-0000Iy-MS for qemu-devel@nongnu.org; Thu, 09 Jun 2022 03:50:46 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:46826) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nzCvy-0002SI-RS for qemu-devel@nongnu.org; Thu, 09 Jun 2022 03:50:39 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1654761026; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=brUwTVmCSy0mM0fxI7ugSKgMUOyvDlFLit2U2bby8AM=; b=Tqk5W9dj/YsZ03dEUP69J6FujRR3w3lol8ESAw7HhhzZl7f6D56eYGDa6LE1cqIHJwmTse ONQ4e9348IR4w79CAjspj/HgMdIikJ4wYJAsicIFwaLgqRxuyqwPA/KxuD4V5aLqOihll3 e7mKleqEpaWaXr1t/fU10BL01hmjj8M= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-481-tMNnuV6WM-a8N7s4ZAzCfQ-1; Thu, 09 Jun 2022 03:50:24 -0400 X-MC-Unique: tMNnuV6WM-a8N7s4ZAzCfQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 3139B294EDCA; Thu, 9 Jun 2022 07:50:24 +0000 (UTC) Received: from lacos-laptop-7.usersys.redhat.com (unknown [10.39.192.37]) by smtp.corp.redhat.com (Postfix) with ESMTPS id EB90D1121314; Thu, 9 Jun 2022 07:50:22 +0000 (UTC) Subject: Re: [RFC][PATCH] docs: note exception for PCIe IO port access From: Laszlo Ersek To: Kevin Locke , qemu-devel@nongnu.org Cc: Marcel Apfelbaum , Laine Stump , David Gibson , Alex Williamson References: <922cc3081ff9c986188f881ef4d1cf15bd3adf48.1654739990.git.kevin@kevinlocke.name> <63e991af-0dd2-3aea-2f15-7460a6fb87db@redhat.com> Message-ID: <06171fb8-3a7e-81f3-12dd-b5332d99c1dd@redhat.com> Date: Thu, 9 Jun 2022 09:50:21 +0200 MIME-Version: 1.0 In-Reply-To: <63e991af-0dd2-3aea-2f15-7460a6fb87db@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 Received-SPF: pass client-ip=170.10.129.124; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 06/09/22 09:45, Laszlo Ersek wrote: > +Alex > > On 06/09/22 04:00, Kevin Locke wrote: > *In theory*, scenario (b) applies to "bochs-display" and > "virtio-gpu-pci" when you plug them into a legacy PCI slot: > >> Plugging a PCI Express device into a PCI slot will hide the Extended >> Configuration Space thus is also not recommended. > > But this is fine, as these device models don't have extended > capabilities in practice. IOW, I'd imagine them (if they were physical > cards) as PCI Express devices without any use for their extended config > spaces. You could plug them into legacy PCI slots, but would see no > difference in behavior (apart from speed perhaps). Ignore the part starting with "IOW", that seems like brain fart on my part, apologies! :/