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=-9.7 required=3.0 tests=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 CD154C35240 for ; Wed, 29 Jan 2020 12:06:49 +0000 (UTC) Received: from whitealder.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 AC5AF2071E for ; Wed, 29 Jan 2020 12:06:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AC5AF2071E 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 whitealder.osuosl.org (Postfix) with ESMTP id 6D47F86E5A; Wed, 29 Jan 2020 12:06:49 +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 vuIZqtCoO5Y9; Wed, 29 Jan 2020 12:06:48 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id 4E72D86A14; Wed, 29 Jan 2020 12:06:48 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 38846C1D85; Wed, 29 Jan 2020 12:06:48 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id C4781C1D84 for ; Wed, 29 Jan 2020 12:06:41 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id B40E486A14 for ; Wed, 29 Jan 2020 12:06:41 +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 szboy8-qhxQx for ; Wed, 29 Jan 2020 12:06:40 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by whitealder.osuosl.org (Postfix) with ESMTPS id D831B86E0A for ; Wed, 29 Jan 2020 12:06:39 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Jan 2020 04:06:39 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,377,1574150400"; d="scan'208";a="222433142" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga008.jf.intel.com with ESMTP; 29 Jan 2020 04:06:38 -0800 From: "Liu, Yi L" To: alex.williamson@redhat.com, eric.auger@redhat.com Subject: [RFC v3 3/8] vfio: Reclaim PASIDs when application is down Date: Wed, 29 Jan 2020 04:11:47 -0800 Message-Id: <1580299912-86084-4-git-send-email-yi.l.liu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1580299912-86084-1-git-send-email-yi.l.liu@intel.com> References: <1580299912-86084-1-git-send-email-yi.l.liu@intel.com> Cc: kevin.tian@intel.com, ashok.raj@intel.com, kvm@vger.kernel.org, jean-philippe.brucker@arm.com, jun.j.tian@intel.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, yi.y.sun@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" From: Liu Yi L When userspace application is down, kernel should reclaim the PASIDs allocated for this application to avoid PASID leak. This patch adds a PASID list in vfio_mm structure to track the allocated PASIDs. The PASID reclaim will be triggered when last vfio container is released. Previous discussions: https://patchwork.kernel.org/patch/11209429/ Cc: Kevin Tian CC: Jacob Pan Cc: Alex Williamson Cc: Eric Auger Cc: Jean-Philippe Brucker Signed-off-by: Liu Yi L --- drivers/vfio/vfio.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++--- include/linux/vfio.h | 6 ++++++ 2 files changed, 64 insertions(+), 3 deletions(-) diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index c43c757..425d60a 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -2148,15 +2148,31 @@ static struct vfio_mm *vfio_create_mm(struct mm_struct *mm) vmm->pasid_quota = VFIO_DEFAULT_PASID_QUOTA; vmm->pasid_count = 0; mutex_init(&vmm->pasid_lock); + INIT_LIST_HEAD(&vmm->pasid_list); list_add(&vmm->vfio_next, &vfio.vfio_mm_list); return vmm; } +static void vfio_mm_reclaim_pasid(struct vfio_mm *vmm) +{ + struct pasid_node *pnode, *tmp; + + mutex_lock(&vmm->pasid_lock); + list_for_each_entry_safe(pnode, tmp, &vmm->pasid_list, next) { + pr_info("%s, reclaim pasid: %u\n", __func__, pnode->pasid); + list_del(&pnode->next); + ioasid_free(pnode->pasid); + kfree(pnode); + } + mutex_unlock(&vmm->pasid_lock); +} + static void vfio_mm_unlock_and_free(struct vfio_mm *vmm) { mutex_unlock(&vfio.vfio_mm_lock); + vfio_mm_reclaim_pasid(vmm); kfree(vmm); } @@ -2204,6 +2220,39 @@ struct vfio_mm *vfio_mm_get_from_task(struct task_struct *task) } EXPORT_SYMBOL_GPL(vfio_mm_get_from_task); +/** + * Caller should hold vmm->pasid_lock + */ +static int vfio_mm_insert_pasid_node(struct vfio_mm *vmm, u32 pasid) +{ + struct pasid_node *pnode; + + pnode = kzalloc(sizeof(*pnode), GFP_KERNEL); + if (!pnode) + return -ENOMEM; + pnode->pasid = pasid; + list_add(&pnode->next, &vmm->pasid_list); + + return 0; +} + +/** + * Caller should hold vmm->pasid_lock + */ +static void vfio_mm_remove_pasid_node(struct vfio_mm *vmm, u32 pasid) +{ + struct pasid_node *pnode, *tmp; + + list_for_each_entry_safe(pnode, tmp, &vmm->pasid_list, next) { + if (pnode->pasid == pasid) { + list_del(&pnode->next); + kfree(pnode); + break; + } + } + +} + int vfio_mm_pasid_alloc(struct vfio_mm *vmm, int min, int max) { ioasid_t pasid; @@ -2221,9 +2270,15 @@ int vfio_mm_pasid_alloc(struct vfio_mm *vmm, int min, int max) ret = -ENOSPC; goto out_unlock; } - vmm->pasid_count++; - ret = pasid; + if (vfio_mm_insert_pasid_node(vmm, pasid)) { + ret = -ENOSPC; + ioasid_free(pasid); + } else { + ret = pasid; + vmm->pasid_count++; + } + out_unlock: mutex_unlock(&vmm->pasid_lock); return ret; @@ -2243,7 +2298,7 @@ int vfio_mm_pasid_free(struct vfio_mm *vmm, ioasid_t pasid) goto out_unlock; } ioasid_free(pasid); - + vfio_mm_remove_pasid_node(vmm, pasid); vmm->pasid_count--; out_unlock: mutex_unlock(&vmm->pasid_lock); diff --git a/include/linux/vfio.h b/include/linux/vfio.h index b6c9c8c..a2ea7e0 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -89,12 +89,18 @@ extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops); extern void vfio_unregister_iommu_driver( const struct vfio_iommu_driver_ops *ops); +struct pasid_node { + u32 pasid; + struct list_head next; +}; + #define VFIO_DEFAULT_PASID_QUOTA 1000 struct vfio_mm { struct kref kref; struct mutex pasid_lock; int pasid_quota; int pasid_count; + struct list_head pasid_list; struct mm_struct *mm; struct list_head vfio_next; }; -- 2.7.4 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu