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=-6.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_PASS,URIBL_BLOCKED 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 45A7FC43387 for ; Mon, 7 Jan 2019 18:49:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1ECC8206BB for ; Mon, 7 Jan 2019 18:49:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727810AbfAGStF (ORCPT ); Mon, 7 Jan 2019 13:49:05 -0500 Received: from mga03.intel.com ([134.134.136.65]:7887 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727892AbfAGStA (ORCPT ); Mon, 7 Jan 2019 13:49:00 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Jan 2019 10:49:00 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,451,1539673200"; d="scan'208";a="308285469" Received: from jprestwo.jf.intel.com ([10.54.74.49]) by fmsmga006.fm.intel.com with ESMTP; 07 Jan 2019 10:49:00 -0800 Message-ID: <58b874c2ecd865ff5abc52e037f63d3a1cc7ecc5.camel@linux.intel.com> Subject: Re: Issue with Ath9k/PCI passthrough From: James Prestwood To: Christian Lamparter Cc: linux-wireless@vger.kernel.org Date: Mon, 07 Jan 2019 10:53:49 -0800 In-Reply-To: <3155667.IrPEAHJHAv@debian64> References: <6cc1ddae1bab8f71daa07c2c7082354507496f5f.camel@linux.intel.com> <3155667.IrPEAHJHAv@debian64> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org On Mon, 2019-01-07 at 19:24 +0100, Christian Lamparter wrote: > On Monday, January 7, 2019 6:55:48 PM CET James Prestwood wrote: > > Hi, > > > > I am passing through PCI wireless adapters into a qemu VM and I am > > seeing my host machine lock up/freeze when starting qemu if I try > > and > > pass through an Atheros AR5B22 PCI card. After reboot I don't see > > anything suspicious in /var/log/kern.log, although I don't really > > know > > what to look for either (or maybe there is another log to look > > at?). I > > have successfully done PCI passthrough with both an Intel 7260 and > > 3160. Its whenever I add the Atheros card into the mix (or by > > itself) I > > get this lockup when starting the VM. > > > > I have enabled the Ath9k drivers when building the kernel (same as > > with > > Intel cards). This page I read online ( > > https://wiki.debian.org/ath9k) > > said the Ath9k cards don't require firmware like the Intel cards > > do, so > > I have not added any firmware binaries for this card into the > > kernel > > build. I also tried turning on the Ath9k debugging but saw no > > additional prints in kern.log. > > > > With PCI passthrough there is some configuration required, like > > substituting the drivers for the vfio-pci driver on the host > > machine, > > so it could be completely unrelated to the Ath9k driver. Still, I > > was > > hoping that someone more knowledgeable than me may know whats going > > on, > > or at least where to look. The fact that the Intel cards work fine > > was > > what made me think it could be a driver problem. > > > > I am more or less following this guide (except with wifi adapters > > rather than GPU): > > https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF > > > > You could be a victim of: > > > /* > > * Some Atheros AR9xxx and QCA988x chips do not behave after a bus > > reset. > > * The device will throw a Link Down error on AER-capable systems > > and > > * regardless of AER, config space of the device is never accessible > > again > > * and typically causes the system to hang or reset when access is > > attempted. > > * http://www.spinics.net/lists/linux-pci/msg34797.html > > */ > > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0030, > > quirk_no_bus_reset); > > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0032, > > quirk_no_bus_reset); > > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x003c, > > quirk_no_bus_reset); > > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0033, > > quirk_no_bus_reset); Adding this to my guest kernel and rebuilding didn't change anything: DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0034, quirk_no_bus_reset); But would I need to make this change on the host kernel as well? > > < > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/quirks.c#n3400 > > > > I know that the AR93xx and AR94xx cards have problems with PCIe > Passthrough: > and > so maybe you > can get > it to work, once you add a entry to the fixup list. > > Regards, > Christian > >