From nobody Mon Feb 9 01:30:41 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1574448640; cv=none; d=zohomail.com; s=zohoarc; b=BNYX1jHyoqpKQhMMrgxVQxQRulYjkONX1DnICqUI4TGAwHak+Df8h9+PkP0jPryj1+s1cdu8VY+ZrJuE6D+jWD2U6jO/lJdTgHsNQ91OGUn8TIFwYQlW8e+a/Z5wYaQKzHZSlTb2/+zDYXGtKmn0CISpt6BD9JhR5E6ySsA5VuE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1574448640; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=hP1XRUr8hBzDtWLyDgeKj1K15HOETKuvmw9ZYMPh4qw=; b=kDkrHgHU5Z6gVB43Unv23QZDgzCXS2bOxCaq6iYhjqJp+BmWh8bHHQRvhDKqGEoaNSDP++n86ZfnjvMdB5/A5rvYbFawfMshIIQSHvNktSUBP1+TLCWKIU1i3TzzU3/iAogTCrKqcPcV8B5uzIsoNR1y/ORt2um4CydAilu05hY= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1574448640078244.50111327887078; Fri, 22 Nov 2019 10:50:40 -0800 (PST) Received: from localhost ([::1]:54296 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iYE0r-0003fs-O8 for importer@patchew.org; Fri, 22 Nov 2019 13:50:37 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:39885) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iYDi4-0000Fm-Jl for qemu-devel@nongnu.org; Fri, 22 Nov 2019 13:31:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iYDi3-0000Hc-4T for qemu-devel@nongnu.org; Fri, 22 Nov 2019 13:31:12 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:23718 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iYDi3-0000HH-01 for qemu-devel@nongnu.org; Fri, 22 Nov 2019 13:31:11 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-2-Z1jxOUdkPhWfzFz-RbzO7A-1; Fri, 22 Nov 2019 13:31:09 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9B137477; Fri, 22 Nov 2019 18:31:07 +0000 (UTC) Received: from laptop.redhat.com (ovpn-116-37.ams2.redhat.com [10.36.116.37]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3CABC6E712; Fri, 22 Nov 2019 18:31:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574447470; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hP1XRUr8hBzDtWLyDgeKj1K15HOETKuvmw9ZYMPh4qw=; b=Ecmc/wFNh4U9DY5OXzMEjuyajO6JbbsPeIrQPIP4SifIo8qZO3+u9anvpaGdknR+VHbVxY n1Igj+frg46j9Uc8RiB0ecK7G180dLi6dwpF1ZN+OYSHEhZ3hcXjr3IARzOeb1xqYq/HGo kH/IgYB+ig8udJKi3CMbnvwWhQ9w14E= 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, armbru@redhat.com, jean-philippe.brucker@arm.com, bharatb.linux@gmail.com, yang.zhong@intel.com, dgilbert@redhat.com, quintela@redhat.com Subject: [PATCH for-5.0 v11 09/20] virtio-iommu: Implement fault reporting Date: Fri, 22 Nov 2019 19:29:32 +0100 Message-Id: <20191122182943.4656-10-eric.auger@redhat.com> In-Reply-To: <20191122182943.4656-1-eric.auger@redhat.com> References: <20191122182943.4656-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: Z1jxOUdkPhWfzFz-RbzO7A-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kevin.tian@intel.com, peterx@redhat.com, tnowicki@marvell.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" The event queue allows to report asynchronous errors. The translate function now injects faults when relevant. Signed-off-by: Eric Auger --- v10 -> v11: - change a virtio_error into an error_report_once (no buffer available for output faults) --- hw/virtio/trace-events | 1 + hw/virtio/virtio-iommu.c | 69 +++++++++++++++++++++++++++++++++++++--- 2 files changed, 65 insertions(+), 5 deletions(-) diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events index de7cbb3c8f..a572eb71aa 100644 --- a/hw/virtio/trace-events +++ b/hw/virtio/trace-events @@ -73,3 +73,4 @@ virtio_iommu_put_endpoint(uint32_t ep_id) "Free endpoint= =3D%d" virtio_iommu_get_domain(uint32_t domain_id) "Alloc domain=3D%d" virtio_iommu_put_domain(uint32_t domain_id) "Free domain=3D%d" virtio_iommu_translate_out(uint64_t virt_addr, uint64_t phys_addr, uint32_= t sid) "0x%"PRIx64" -> 0x%"PRIx64 " for sid=3D%d" +virtio_iommu_report_fault(uint8_t reason, uint32_t flags, uint32_t endpoin= t, uint64_t addr) "FAULT reason=3D%d flags=3D%d endpoint=3D%d address =3D0x= %"PRIx64 diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index a83666557b..723616a5db 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -407,6 +407,51 @@ out: } } =20 +static void virtio_iommu_report_fault(VirtIOIOMMU *viommu, uint8_t reason, + uint32_t flags, uint32_t endpoint, + uint64_t address) +{ + VirtIODevice *vdev =3D &viommu->parent_obj; + VirtQueue *vq =3D viommu->event_vq; + struct virtio_iommu_fault fault; + VirtQueueElement *elem; + size_t sz; + + memset(&fault, 0, sizeof(fault)); + fault.reason =3D reason; + fault.flags =3D flags; + fault.endpoint =3D endpoint; + fault.address =3D address; + + for (;;) { + elem =3D virtqueue_pop(vq, sizeof(VirtQueueElement)); + + if (!elem) { + error_report_once( + "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 =3D iov_from_buf(elem->in_sg, elem->in_num, 0, + &fault, sizeof(fault)); + assert(sz =3D=3D 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) @@ -415,9 +460,10 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemor= yRegion *mr, hwaddr addr, viommu_interval interval, *mapping_key; viommu_mapping *mapping_value; VirtIOIOMMU *s =3D sdev->viommu; + bool read_fault, write_fault; viommu_endpoint *ep; + uint32_t sid, flags; bool bypass_allowed; - uint32_t sid; bool found; =20 interval.low =3D addr; @@ -443,6 +489,8 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemory= Region *mr, hwaddr addr, if (!ep) { if (!bypass_allowed) { error_report_once("%s sid=3D%d is not known!!", __func__, sid); + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_UNKNOWN, + 0, sid, 0); } else { entry.perm =3D flag; } @@ -455,6 +503,8 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemory= Region *mr, hwaddr addr, "%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 =3D flag; } @@ -468,16 +518,25 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemo= ryRegion *mr, hwaddr addr, qemu_log_mask(LOG_GUEST_ERROR, "%s no mapping for 0x%"PRIx64" for sid=3D%d\n", __func__, addr, sid); + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING, + 0, sid, addr); goto unlock; } =20 - if (((flag & IOMMU_RO) && - !(mapping_value->flags & VIRTIO_IOMMU_MAP_F_READ)) || - ((flag & IOMMU_WO) && - !(mapping_value->flags & VIRTIO_IOMMU_MAP_F_WRITE))) { + read_fault =3D (flag & IOMMU_RO) && + !(mapping_value->flags & VIRTIO_IOMMU_MAP_F_READ); + write_fault =3D (flag & IOMMU_WO) && + !(mapping_value->flags & VIRTIO_IOMMU_MAP_F_WRITE); + + flags =3D read_fault ? VIRTIO_IOMMU_FAULT_F_READ : 0; + flags |=3D write_fault ? VIRTIO_IOMMU_FAULT_F_WRITE : 0; + if (flags) { qemu_log_mask(LOG_GUEST_ERROR, "Permission error on 0x%"PRIx64"(%d): allowed=3D%d\n= ", addr, flag, mapping_value->flags); + flags |=3D VIRTIO_IOMMU_FAULT_F_ADDRESS; + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING, + flags, sid, addr); goto unlock; } entry.translated_addr =3D addr - mapping_key->low + mapping_value->phy= s_addr; --=20 2.20.1