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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 6771AC28CBF for ; Sun, 26 May 2019 16:12:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 49CA220657 for ; Sun, 26 May 2019 16:12:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728059AbfEZQMm (ORCPT ); Sun, 26 May 2019 12:12:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39684 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728028AbfEZQMm (ORCPT ); Sun, 26 May 2019 12:12:42 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A961130832C6; Sun, 26 May 2019 16:12:41 +0000 (UTC) Received: from laptop.redhat.com (ovpn-116-67.ams2.redhat.com [10.36.116.67]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8EC745D72A; Sun, 26 May 2019 16:12:33 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, joro@8bytes.org, alex.williamson@redhat.com, jacob.jun.pan@linux.intel.com, yi.l.liu@intel.com, jean-philippe.brucker@arm.com, will.deacon@arm.com, robin.murphy@arm.com Cc: kevin.tian@intel.com, ashok.raj@intel.com, marc.zyngier@arm.com, peter.maydell@linaro.org, vincent.stehle@arm.com Subject: [PATCH v8 26/29] vfio-pci: Register an iommu fault handler Date: Sun, 26 May 2019 18:10:01 +0200 Message-Id: <20190526161004.25232-27-eric.auger@redhat.com> In-Reply-To: <20190526161004.25232-1-eric.auger@redhat.com> References: <20190526161004.25232-1-eric.auger@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Sun, 26 May 2019 16:12:41 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch registers a fault handler which records faults in a circular buffer and then signals an eventfd. This buffer is exposed within the fault region. Signed-off-by: Eric Auger --- v3 -> v4: - move iommu_unregister_device_fault_handler to vfio_pci_release --- drivers/vfio/pci/vfio_pci.c | 49 +++++++++++++++++++++++++++++ drivers/vfio/pci/vfio_pci_private.h | 1 + 2 files changed, 50 insertions(+) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index f75f61127277..520999994ba8 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -30,6 +30,7 @@ #include #include #include +#include #include "vfio_pci_private.h" @@ -296,6 +297,46 @@ static const struct vfio_pci_regops vfio_pci_fault_prod_regops = { .add_capability = vfio_pci_fault_prod_add_capability, }; +int vfio_pci_iommu_dev_fault_handler(struct iommu_fault_event *evt, void *data) +{ + struct vfio_pci_device *vdev = (struct vfio_pci_device *) data; + struct vfio_region_fault_prod *prod_region = + (struct vfio_region_fault_prod *)vdev->fault_pages; + struct vfio_region_fault_cons *cons_region = + (struct vfio_region_fault_cons *)(vdev->fault_pages + 2 * PAGE_SIZE); + struct iommu_fault *new = + (struct iommu_fault *)(vdev->fault_pages + prod_region->offset + + prod_region->prod * prod_region->entry_size); + int prod, cons, size; + + mutex_lock(&vdev->fault_queue_lock); + + if (!vdev->fault_abi) + goto unlock; + + prod = prod_region->prod; + cons = cons_region->cons; + size = prod_region->nb_entries; + + if (CIRC_SPACE(prod, cons, size) < 1) + goto unlock; + + *new = evt->fault; + prod = (prod + 1) % size; + prod_region->prod = prod; + mutex_unlock(&vdev->fault_queue_lock); + + mutex_lock(&vdev->igate); + if (vdev->dma_fault_trigger) + eventfd_signal(vdev->dma_fault_trigger, 1); + mutex_unlock(&vdev->igate); + return 0; + +unlock: + mutex_unlock(&vdev->fault_queue_lock); + return -EINVAL; +} + static int vfio_pci_init_fault_region(struct vfio_pci_device *vdev) { struct vfio_region_fault_prod *header; @@ -328,6 +369,13 @@ static int vfio_pci_init_fault_region(struct vfio_pci_device *vdev) header = (struct vfio_region_fault_prod *)vdev->fault_pages; header->version = -1; header->offset = PAGE_SIZE; + + ret = iommu_register_device_fault_handler(&vdev->pdev->dev, + vfio_pci_iommu_dev_fault_handler, + vdev); + if (ret) + goto out; + return 0; out: kfree(vdev->fault_pages); @@ -570,6 +618,7 @@ static void vfio_pci_release(void *device_data) if (!(--vdev->refcnt)) { vfio_spapr_pci_eeh_release(vdev->pdev); vfio_pci_disable(vdev); + iommu_unregister_device_fault_handler(&vdev->pdev->dev); } mutex_unlock(&vdev->reflck->lock); diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h index 8e0a55682d3f..a9276926f008 100644 --- a/drivers/vfio/pci/vfio_pci_private.h +++ b/drivers/vfio/pci/vfio_pci_private.h @@ -122,6 +122,7 @@ struct vfio_pci_device { int ioeventfds_nr; struct eventfd_ctx *err_trigger; struct eventfd_ctx *req_trigger; + struct eventfd_ctx *dma_fault_trigger; struct mutex fault_queue_lock; int fault_abi; struct list_head dummy_resources_list; -- 2.20.1