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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 648B1C00144 for ; Fri, 29 Jul 2022 22:22:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239054AbiG2WWp (ORCPT ); Fri, 29 Jul 2022 18:22:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238561AbiG2WWo (ORCPT ); Fri, 29 Jul 2022 18:22:44 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AA3233F318; Fri, 29 Jul 2022 15:22:43 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 44D49B829DA; Fri, 29 Jul 2022 22:22:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 960F2C433C1; Fri, 29 Jul 2022 22:22:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1659133360; bh=bOE0cFSfd9j0Ebec4rZcMchvAjKnySFjPVmPPm0v4SM=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=IBnQ9kguUzE0r+FypL9wCXYrfXepKex/VI76VfwXTyN8nhXho0sLaY7Q5pzNCkpY6 XHyPeQ0uu/En8bP9RQdZf6j0uGYoinTiwYE13v/kjE7c/Q3H8xDfggOyVsqJPPxqWs NugTwjKjY/7x+821a08n1tSJS+007L9Tk20sU6+VE4YdmuFi4Me1+xyi6tTkYKxKpV i+F6qqsgy71d8rh0XPFAT5GUGcNTOgYOqd3o9+K5+fmdcrkvikOCG+W/p/nUZU43Yl zpOP/Ln3QrDpEcMGFbPOYncBeg26GB9WChyrqWplvKTxQyJ1dO1CJaMAMH2KB5qsl+ Hb9AQMD/iomXA== Date: Fri, 29 Jul 2022 17:22:38 -0500 From: Bjorn Helgaas To: Paul Menzel Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, Bjorn Helgaas , linux-pci@vger.kernel.org, LKML , it+x86@molgen.mpg.de, Robert Dinse Subject: Re: acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge. Message-ID: <20220729222238.GA491273@bhelgaas> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org [+cc Robert] On Mon, Feb 15, 2021 at 05:53:51PM +0100, Paul Menzel wrote: > Dear Linux folks, > > > All the way up to QEMU emulator version 5.2.0 (Debian 1:5.2+dfsg-5) and > Linux 5.10.13, Linux logs the warning below: > > acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended > PCI configuration space under this bridge. > > One way to reproduce it: > > qemu-system-x86_64 -enable-kvm -m 2G -hda /dev/shm/debian.img -kernel > /boot/vmlinuz-5.10.0-3-amd64 -initrd /boot/initrd.img-5.10.0-3-amd64 -append > root="/dev/sda1 console=ttyS0,115200" -serial stdio > > Please find more details and the full log in the Bugzilla issue #211765 [1]. > > > Kind regards, > > Paul > > > [1]: https://bugzilla.kernel.org/show_bug.cgi?id=211765 > "[Bug 211765] acpi PNP0A03:00: fail to add MMCONFIG information, can't > access extended PCI configuration space under this bridge." Do you know whether qemu implements extended config space? Extended config space is offsets 0x100-0xfff. I think Linux only supports extended capabilities in that area (AER, VC, ACS, SR-IOV, etc). Most of these are probably not of interest in a virtualized environment, so I wouldn't be surprised if qemu doesn't support them. Bjorn