From patchwork Fri Nov 9 11:29:51 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 995466 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 42ryvL2FlTz9sC7 for ; Fri, 9 Nov 2018 22:42:54 +1100 (AEDT) Received: from localhost ([::1]:33335 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gL5Bb-0002Xn-Tb for incoming@patchwork.ozlabs.org; Fri, 09 Nov 2018 06:42:51 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46066) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gL50I-0006y6-9F for qemu-devel@nongnu.org; Fri, 09 Nov 2018 06:31:15 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gL50G-0001x0-9T for qemu-devel@nongnu.org; Fri, 09 Nov 2018 06:31:10 -0500 Received: from mx1.redhat.com ([209.132.183.28]:58664) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gL506-0001Gf-Si; Fri, 09 Nov 2018 06:30:59 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0BAE27AE95; Fri, 9 Nov 2018 11:30:58 +0000 (UTC) Received: from laptop.redhat.com (ovpn-116-55.ams2.redhat.com [10.36.116.55]) by smtp.corp.redhat.com (Postfix) with ESMTP id C431D5C219; Fri, 9 Nov 2018 11:30:55 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, mst@redhat.com, jean-philippe.brucker@arm.com Date: Fri, 9 Nov 2018 12:29:51 +0100 Message-Id: <20181109112957.10067-13-eric.auger@redhat.com> In-Reply-To: <20181109112957.10067-1-eric.auger@redhat.com> References: <20181109112957.10067-1-eric.auger@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Fri, 09 Nov 2018 11:30:58 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [RFC v8 12/18] virtio-iommu: Implement fault reporting X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tn@semihalf.com, kevin.tian@intel.com, bharat.bhushan@nxp.com, peterx@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The event queue allows to report asynchronous errors. The translate function now injects faults when relevant. Signed-off-by: Eric Auger --- hw/virtio/trace-events | 1 + hw/virtio/virtio-iommu.c | 67 ++++++++++++++++++++++++++++++++++++++-- 2 files changed, 65 insertions(+), 3 deletions(-) diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events index 19824c3e91..053a07b3fc 100644 --- a/hw/virtio/trace-events +++ b/hw/virtio/trace-events @@ -71,3 +71,4 @@ virtio_iommu_unmap_inc_interval(uint64_t low, uint64_t high) "Unmap inc [0x%"PRI virtio_iommu_translate_out(uint64_t virt_addr, uint64_t phys_addr, uint32_t sid) "0x%"PRIx64" -> 0x%"PRIx64 " for sid=%d" virtio_iommu_fill_resv_property(uint32_t devid, uint8_t subtype, uint64_t start, uint64_t end, uint32_t flags, size_t filled) "dev= %d, subtype=%d start=0x%"PRIx64" end=0x%"PRIx64" flags=%d filled=0x%lx" virtio_iommu_fill_none_property(uint32_t devid) "devid=%d" +virtio_iommu_report_fault(uint8_t reason, uint32_t flags, uint32_t endpoint, uint64_t addr) "FAULT reason=%d flags=%d endpoint=%d address =0x%"PRIx64 diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index e6ad8a0c61..e5ab3db834 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -686,17 +686,63 @@ push: } } +static void virtio_iommu_report_fault(VirtIOIOMMU *viommu, uint8_t reason, + uint32_t flags, uint32_t endpoint, + uint64_t address) +{ + VirtIODevice *vdev = &viommu->parent_obj; + VirtQueue *vq = viommu->event_vq; + struct virtio_iommu_fault fault; + VirtQueueElement *elem; + size_t sz; + + memset(&fault, 0, sizeof(fault)); + fault.reason = reason; + fault.flags = flags; + fault.endpoint = endpoint; + fault.address = address; + + for (;;) { + elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); + + if (!elem) { + virtio_error(vdev, + "no buffer available in event queue to report event"); + return; + } + + if (iov_size(elem->in_sg, elem->in_num) < sizeof(fault)) { + virtio_error(vdev, "error buffer of wrong size"); + virtqueue_detach_element(vq, elem, 0); + g_free(elem); + continue; + } + break; + } + /* we have a buffer to fill in */ + sz = iov_from_buf(elem->in_sg, elem->in_num, 0, + &fault, sizeof(fault)); + assert(sz == sizeof(fault)); + + trace_virtio_iommu_report_fault(reason, flags, endpoint, address); + virtqueue_push(vq, elem, sz); + virtio_notify(vdev, vq); + g_free(elem); + +} + static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr, IOMMUAccessFlags flag, int iommu_idx) { IOMMUDevice *sdev = container_of(mr, IOMMUDevice, iommu_mr); VirtIOIOMMU *s = sdev->viommu; - uint32_t sid; + uint32_t sid, flags; viommu_endpoint *ep; viommu_mapping *mapping; viommu_interval interval; bool bypass_allowed; + bool read_fault, write_fault; interval.low = addr; interval.high = addr + 1; @@ -721,6 +767,8 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr, if (!ep) { if (!bypass_allowed) { error_report("%s sid=%d is not known!!", __func__, sid); + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_UNKNOWN, + 0, sid, 0); } else { entry.perm = flag; } @@ -732,6 +780,8 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr, qemu_log_mask(LOG_GUEST_ERROR, "%s %02x:%02x.%01x not attached to any domain\n", __func__, PCI_BUS_NUM(sid), PCI_SLOT(sid), PCI_FUNC(sid)); + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_DOMAIN, + 0, sid, 0); } else { entry.perm = flag; } @@ -743,14 +793,25 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr, qemu_log_mask(LOG_GUEST_ERROR, "%s no mapping for 0x%"PRIx64" for sid=%d\n", __func__, addr, sid); + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING, + 0, sid, addr); goto unlock; } - if (((flag & IOMMU_RO) && !(mapping->flags & VIRTIO_IOMMU_MAP_F_READ)) || - ((flag & IOMMU_WO) && !(mapping->flags & VIRTIO_IOMMU_MAP_F_WRITE))) { + read_fault = (flag & IOMMU_RO) && + !(mapping->flags & VIRTIO_IOMMU_MAP_F_READ); + write_fault = (flag & IOMMU_WO) && + !(mapping->flags & VIRTIO_IOMMU_MAP_F_WRITE); + + flags = read_fault ? VIRTIO_IOMMU_FAULT_F_READ : 0; + flags |= write_fault ? VIRTIO_IOMMU_FAULT_F_WRITE : 0; + if (flags) { qemu_log_mask(LOG_GUEST_ERROR, "Permission error on 0x%"PRIx64"(%d): allowed=%d\n", addr, flag, mapping->flags); + flags |= VIRTIO_IOMMU_FAULT_F_ADDRESS; + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING, + flags, sid, addr); goto unlock; } entry.translated_addr = addr - mapping->virt_addr + mapping->phys_addr;