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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 1F336C2D0DB for ; Fri, 24 Jan 2020 11:19:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DFFB120704 for ; Fri, 24 Jan 2020 11:19:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579864765; bh=vz2OTQwUDciEzjhTFliF4TOLbUaJjLaPiYKntIht4+c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=d9O3m0kiM5PMUkPAXLOYK+koOelfwtIQTQW+ybkN938XiPJoW0RolA3pQxvokXAcq bkvd44dWWHcn5OQkgqPHta9LoIeLw8bajbldf6K4jG1j9jULZehTt3jnLeWlk2YW20 E7XwklHQ95+PWCGWKnDbMsoCgQRvvFpDGZyYXqDo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390782AbgAXLTY (ORCPT ); Fri, 24 Jan 2020 06:19:24 -0500 Received: from mail.kernel.org ([198.145.29.99]:56652 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390763AbgAXLTQ (ORCPT ); Fri, 24 Jan 2020 06:19:16 -0500 Received: from localhost (ip-213-127-102-57.ip.prioritytelecom.net [213.127.102.57]) (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 6E70B20704; Fri, 24 Jan 2020 11:19:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579864756; bh=vz2OTQwUDciEzjhTFliF4TOLbUaJjLaPiYKntIht4+c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MF35OD0uSAMaNAD4m8hvm4yAUX+vwpyQZY1An3IgnOyk/II6/IEjxFb2XJ+l6cz+n W1pNveVbM4o94B44mhuqri8zOqjo5XhJf3pkG5OfSWu0pNB63ymXI9xz6eHU1JgQA1 OBqaVte35sD1sTtYlyLdM/DClLqoFt3j+Ek3pyLs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ashok Raj , Jacob Pan , Kevin Tian , Lu Baolu , Zhenyu Wang , Joerg Roedel , Sasha Levin Subject: [PATCH 4.19 344/639] iommu/vt-d: Make kernel parameter igfx_off work with vIOMMU Date: Fri, 24 Jan 2020 10:28:34 +0100 Message-Id: <20200124093130.217168640@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200124093047.008739095@linuxfoundation.org> References: <20200124093047.008739095@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lu Baolu [ Upstream commit 5daab58043ee2bca861068e2595564828f3bc663 ] The kernel parameter igfx_off is used by users to disable DMA remapping for the Intel integrated graphic device. It was designed for bare metal cases where a dedicated IOMMU is used for graphic. This doesn't apply to virtual IOMMU case where an include-all IOMMU is used. This makes the kernel parameter work with virtual IOMMU as well. Cc: Ashok Raj Cc: Jacob Pan Suggested-by: Kevin Tian Fixes: c0771df8d5297 ("intel-iommu: Export a flag indicating that the IOMMU is used for iGFX.") Signed-off-by: Lu Baolu Tested-by: Zhenyu Wang Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- drivers/iommu/intel-iommu.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index b9af2419006f8..abbbc614c5225 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -3387,9 +3387,12 @@ static int __init init_dmars(void) iommu_identity_mapping |= IDENTMAP_ALL; #ifdef CONFIG_INTEL_IOMMU_BROKEN_GFX_WA - iommu_identity_mapping |= IDENTMAP_GFX; + dmar_map_gfx = 0; #endif + if (!dmar_map_gfx) + iommu_identity_mapping |= IDENTMAP_GFX; + check_tylersburg_isoch(); if (iommu_identity_mapping) { -- 2.20.1