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=-12.7 required=3.0 tests=BAYES_00, 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 E846CC433E2 for ; Thu, 10 Sep 2020 10:43:40 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 731CC206F4 for ; Thu, 10 Sep 2020 10:43:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 731CC206F4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=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 fraxinus.osuosl.org (Postfix) with ESMTP id 23B1E84E6B; Thu, 10 Sep 2020 10:43:40 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id p9jWeB_F5nyv; Thu, 10 Sep 2020 10:43:39 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 59A2C84CAA; Thu, 10 Sep 2020 10:43:39 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 39A16C0859; Thu, 10 Sep 2020 10:43:39 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 874C6C0051 for ; Thu, 10 Sep 2020 10:43:37 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 7C92187507 for ; Thu, 10 Sep 2020 10:43:37 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HZIeVBxx7IEn for ; Thu, 10 Sep 2020 10:43:36 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by whitealder.osuosl.org (Postfix) with ESMTPS id 48EB18742F for ; Thu, 10 Sep 2020 10:43:36 +0000 (UTC) IronPort-SDR: fyGN8orZ//iq2XlReXY/DSiRAvZYAd6Kb9ZiiKT8oaWR8nqbOMHPw1lX50JXlV2HHYZu69wJGv nvcbs4LVNjow== X-IronPort-AV: E=McAfee;i="6000,8403,9739"; a="138024908" X-IronPort-AV: E=Sophos;i="5.76,412,1592895600"; d="scan'208";a="138024908" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Sep 2020 03:43:35 -0700 IronPort-SDR: z/tjCvDoxY/xShbLCL/VbslXfBbwZznfbIBRqQgFok7okEcyIYeDSp4rNGuyKMXyetitYYS0PL lyblcrkwgGsQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,412,1592895600"; d="scan'208";a="334137195" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga008.jf.intel.com with ESMTP; 10 Sep 2020 03:43:34 -0700 From: Liu Yi L To: alex.williamson@redhat.com, eric.auger@redhat.com, baolu.lu@linux.intel.com, joro@8bytes.org Subject: [PATCH v7 06/16] iommu/vt-d: Remove get_task_mm() in bind_gpasid() Date: Thu, 10 Sep 2020 03:45:23 -0700 Message-Id: <1599734733-6431-7-git-send-email-yi.l.liu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1599734733-6431-1-git-send-email-yi.l.liu@intel.com> References: <1599734733-6431-1-git-send-email-yi.l.liu@intel.com> Cc: jean-philippe@linaro.org, kevin.tian@intel.com, ashok.raj@intel.com, kvm@vger.kernel.org, stefanha@gmail.com, jun.j.tian@intel.com, iommu@lists.linux-foundation.org, yi.y.sun@intel.com, jasowang@redhat.com, hao.wu@intel.com 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: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" This patch is to address a REVISIT. As ioasid_set is added to domain, upper layer/VFIO can set ioasid_set to iommu driver, and track the PASID ownership, so no need to get_task_mm() in intel_svm_bind_gpasid(). Cc: Kevin Tian CC: Jacob Pan Cc: Alex Williamson Cc: Eric Auger Cc: Jean-Philippe Brucker Cc: Joerg Roedel Cc: Lu Baolu Signed-off-by: Liu Yi L --- drivers/iommu/intel/svm.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c index 519eabb..d3cf52b 100644 --- a/drivers/iommu/intel/svm.c +++ b/drivers/iommu/intel/svm.c @@ -400,12 +400,6 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev, ret = -ENOMEM; goto out; } - /* REVISIT: upper layer/VFIO can track host process that bind - * the PASID. ioasid_set = mm might be sufficient for vfio to - * check pasid VMM ownership. We can drop the following line - * once VFIO and IOASID set check is in place. - */ - svm->mm = get_task_mm(current); svm->pasid = data->hpasid; if (data->flags & IOMMU_SVA_GPASID_VAL) { svm->gpasid = data->gpasid; @@ -420,7 +414,6 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev, INIT_WORK(&svm->work, intel_svm_free_async_fn); ioasid_attach_data(data->hpasid, svm); INIT_LIST_HEAD_RCU(&svm->devs); - mmput(svm->mm); } sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); if (!sdev) { -- 2.7.4 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu