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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 ACC16C6379F for ; Tue, 17 Nov 2020 13:28:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 654F22168B for ; Tue, 17 Nov 2020 13:28:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="qaAISAaC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731085AbgKQN1Z (ORCPT ); Tue, 17 Nov 2020 08:27:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:35116 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731709AbgKQN1Y (ORCPT ); Tue, 17 Nov 2020 08:27:24 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4F25920781; Tue, 17 Nov 2020 13:27:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1605619643; bh=imKwv/Fb3tX8Sf2PNoVY7wcaiXIi4oQ+RdrROR2vnxo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qaAISAaC3s7Vpp4NypM6UuT+ESSw+KGWF2X/yhg+y3Ktpurjv2Gnlt0tjawZenSw2 OTAQCY3g9ffbkfAaRed64rqg0adyFqlR5Nz1NSVauYnverLiQNGjdvMApRtO5APQzD TuQlW1SSbOOttH88W23ertyMYB5CvxD9x0MHBC3s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Zhenyu Wang , Xiong Zhang , Hang Yuan , Stuart Summers , Fred Gao , Alex Williamson , Sasha Levin Subject: [PATCH 5.4 077/151] vfio/pci: Bypass IGD init in case of -ENODEV Date: Tue, 17 Nov 2020 14:05:07 +0100 Message-Id: <20201117122125.166272510@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201117122121.381905960@linuxfoundation.org> References: <20201117122121.381905960@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Fred Gao [ Upstream commit e4eccb853664de7bcf9518fb658f35e748bf1f68 ] Bypass the IGD initialization when -ENODEV returns, that should be the case if opregion is not available for IGD or within discrete graphics device's option ROM, or host/lpc bridge is not found. Then use of -ENODEV here means no special device resources found which needs special care for VFIO, but we still allow other normal device resource access. Cc: Zhenyu Wang Cc: Xiong Zhang Cc: Hang Yuan Cc: Stuart Summers Signed-off-by: Fred Gao Signed-off-by: Alex Williamson Signed-off-by: Sasha Levin --- drivers/vfio/pci/vfio_pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index a72fd5309b09f..443a35dde7f52 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -334,7 +334,7 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev) pdev->vendor == PCI_VENDOR_ID_INTEL && IS_ENABLED(CONFIG_VFIO_PCI_IGD)) { ret = vfio_pci_igd_init(vdev); - if (ret) { + if (ret && ret != -ENODEV) { pci_warn(pdev, "Failed to setup Intel IGD regions\n"); goto disable_exit; } -- 2.27.0