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=-15.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 EAC1DC433ED for ; Thu, 8 Apr 2021 00:34:56 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5D0BD61182 for ; Thu, 8 Apr 2021 00:34:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5D0BD61182 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 157FF84C0A; Thu, 8 Apr 2021 00:34:56 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3EXxpl-tCimI; Thu, 8 Apr 2021 00:34:55 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp1.osuosl.org (Postfix) with ESMTP id C7CAB84B8A; Thu, 8 Apr 2021 00:34:54 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id AED7CC000B; Thu, 8 Apr 2021 00:34:54 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 44B6CC000A for ; Thu, 8 Apr 2021 00:34:53 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 3806960DA7 for ; Thu, 8 Apr 2021 00:34:53 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FpZnajmYVqSH for ; Thu, 8 Apr 2021 00:34:52 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by smtp3.osuosl.org (Postfix) with ESMTPS id 6BA9460DA4 for ; Thu, 8 Apr 2021 00:34:52 +0000 (UTC) IronPort-SDR: 727KxMBXgq3xXkur6KVQO05DLN/JViXMOrFg0ETDAY66ZTpA6xAmjIN7CKnn6P9SvdMnxu072+ LMm6FEJdBqCw== X-IronPort-AV: E=McAfee;i="6000,8403,9947"; a="172899387" X-IronPort-AV: E=Sophos;i="5.82,204,1613462400"; d="scan'208";a="172899387" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Apr 2021 17:34:51 -0700 IronPort-SDR: sLPkzggneG9Bd7YbF1P15EUwYK8JjveJoenwDPDjHo0k+cVdUC8jDg+GRQN7hlP2C8YZReP7l5 8Ka1G4LW8fSQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.82,204,1613462400"; d="scan'208";a="441526391" Received: from allen-box.sh.intel.com (HELO [10.239.159.128]) ([10.239.159.128]) by fmsmga004.fm.intel.com with ESMTP; 07 Apr 2021 17:34:48 -0700 Subject: Re: [PATCH 5.4 v2 1/1] iommu/vt-d: Fix agaw for a supported 48 bit guest address width To: Saeed Mirzamohammadi References: <20210407184030.21683-1-saeed.mirzamohammadi@oracle.com> From: Lu Baolu Message-ID: Date: Thu, 8 Apr 2021 08:25:19 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <20210407184030.21683-1-saeed.mirzamohammadi@oracle.com> Content-Language: en-US Cc: Camille Lu , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, David Woodhouse X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 4/8/21 2:40 AM, Saeed Mirzamohammadi wrote: > 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. > > Signed-off-by: Saeed Mirzamohammadi > Tested-by: Camille Lu > --- > > Change in v2: > - Added cap_width to calculate AGAW based on the minimum value of MGAW and AGAW. > --- > drivers/iommu/intel-iommu.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c > index 953d86ca6d2b..a2a03df97704 100644 > --- a/drivers/iommu/intel-iommu.c > +++ b/drivers/iommu/intel-iommu.c > @@ -1853,7 +1853,7 @@ static inline int guestwidth_to_adjustwidth(int gaw) > 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_domain *domain, struct intel_iommu *iommu, > 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); > Reviewed-by: Lu Baolu Best regards, baolu _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu