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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 A3392C4338F for ; Mon, 16 Aug 2021 13:07:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86CD4600D4 for ; Mon, 16 Aug 2021 13:07:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237695AbhHPNHj (ORCPT ); Mon, 16 Aug 2021 09:07:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:57930 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237545AbhHPNFx (ORCPT ); Mon, 16 Aug 2021 09:05:53 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 436DE6328D; Mon, 16 Aug 2021 13:05:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1629119121; bh=zoSqKRO1qgJGNXZqpZAIvDj7q09XrjhVlZIw4wfQf2k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Qy7TBxTx3fnGCRdRUd1WviRe3YQZeYs1vsO4mMNiJBNepr/NB3xxW0OqN3+kDzL8o qJtxQVmefX2U/NCs4Vqe2mwULELt5SMQUA7L8ChdSw92gNsiST/aw740zgbB5LrQ3I lnoxISx/TlVmmivghVB4tCKYERCsCKOvY4I88RNA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Joerg Roedel , Ashok Raj , Saeed Mirzamohammadi , Camille Lu , Lu Baolu Subject: [PATCH 5.4 62/62] iommu/vt-d: Fix agaw for a supported 48 bit guest address width Date: Mon, 16 Aug 2021 15:02:34 +0200 Message-Id: <20210816125430.346492066@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210816125428.198692661@linuxfoundation.org> References: <20210816125428.198692661@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: linux-kernel@vger.kernel.org From: Saeed Mirzamohammadi [ Upstream commit 327d5b2fee91c404a3956c324193892cf2cc9528 ] The IOMMU driver calculates the guest addressability for a DMA request based on the value of the mgaw reported from the IOMMU. However, this is a fused value and as mentioned in the spec, the guest width should be calculated based on the minimum of supported adjusted guest address width (SAGAW) and MGAW. This is from specification: "Guest addressability for a given DMA request is limited to the minimum of the value reported through this field and the adjusted guest address width of the corresponding page-table structure. (Adjusted guest address widths supported by hardware are reported through the SAGAW field)." This causes domain initialization to fail and following errors appear for EHCI PCI driver: [ 2.486393] ehci-pci 0000:01:00.4: EHCI Host Controller [ 2.486624] ehci-pci 0000:01:00.4: new USB bus registered, assigned bus number 1 [ 2.489127] ehci-pci 0000:01:00.4: DMAR: Allocating domain failed [ 2.489350] ehci-pci 0000:01:00.4: DMAR: 32bit DMA uses non-identity mapping [ 2.489359] ehci-pci 0000:01:00.4: can't setup: -12 [ 2.489531] ehci-pci 0000:01:00.4: USB bus 1 deregistered [ 2.490023] ehci-pci 0000:01:00.4: init 0000:01:00.4 fail, -12 [ 2.490358] ehci-pci: probe of 0000:01:00.4 failed with error -12 This issue happens when the value of the sagaw corresponds to a 48-bit agaw. This fix updates the calculation of the agaw based on the minimum of IOMMU's sagaw value and MGAW. This issue happens on the code path of getting a private domain for a device. A private domain was needed when the domain of an iommu group couldn't meet the requirement of a device. The IOMMU core has been evolved to eliminate the need for private domain, hence this code path has alreay been removed from the upstream since commit 327d5b2fee91c ("iommu/vt-d: Allow 32bit devices to uses DMA domain"). Instead of back porting all patches that are required for removing the private domain, this simply fixes it in the affected stable kernel between v4.16 and v5.7. [baolu: The orignal patch could be found here https://lore.kernel.org/linux-iommu/20210412202736.70765-1-saeed.mirzamohammadi@oracle.com/. I added commit message according to Greg's comments at https://lore.kernel.org/linux-iommu/YHZ%2FT9x7Xjf1r6fI@kroah.com/.] Cc: Joerg Roedel Cc: Ashok Raj Cc: stable@vger.kernel.org #v4.16+ Signed-off-by: Saeed Mirzamohammadi Tested-by: Camille Lu Signed-off-by: Lu Baolu Signed-off-by: Greg Kroah-Hartman --- drivers/iommu/intel-iommu.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1853,7 +1853,7 @@ static inline int guestwidth_to_adjustwi static int domain_init(struct dmar_domain *domain, struct intel_iommu *iommu, int guest_width) { - int adjust_width, agaw; + int adjust_width, agaw, cap_width; unsigned long sagaw; int err; @@ -1867,8 +1867,9 @@ static int domain_init(struct dmar_domai domain_reserve_special_ranges(domain); /* calculate AGAW */ - if (guest_width > cap_mgaw(iommu->cap)) - guest_width = cap_mgaw(iommu->cap); + cap_width = min_t(int, cap_mgaw(iommu->cap), agaw_to_width(iommu->agaw)); + if (guest_width > cap_width) + guest_width = cap_width; domain->gaw = guest_width; adjust_width = guestwidth_to_adjustwidth(guest_width); agaw = width_to_agaw(adjust_width);