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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 05A28C43387 for ; Mon, 7 Jan 2019 17:51:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CFDD62070B for ; Mon, 7 Jan 2019 17:51:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728493AbfAGRvA (ORCPT ); Mon, 7 Jan 2019 12:51:00 -0500 Received: from mga06.intel.com ([134.134.136.31]:63257 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728413AbfAGRvA (ORCPT ); Mon, 7 Jan 2019 12:51:00 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Jan 2019 09:50:59 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,451,1539673200"; d="scan'208";a="309725568" Received: from jprestwo.jf.intel.com ([10.54.74.49]) by fmsmga005.fm.intel.com with ESMTP; 07 Jan 2019 09:50:59 -0800 Message-ID: <6cc1ddae1bab8f71daa07c2c7082354507496f5f.camel@linux.intel.com> Subject: Issue with Ath9k/PCI passthrough From: James Prestwood To: linux-wireless@vger.kernel.org Date: Mon, 07 Jan 2019 09:55:48 -0800 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 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 Using a custom built kernel based on 4.19. Thanks, James