From patchwork Tue Sep 15 19:14:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Rosato X-Patchwork-Id: 11777621 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 95A2D618 for ; Tue, 15 Sep 2020 19:26:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6FC9B2078E for ; Tue, 15 Sep 2020 19:26:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="NoqdZB+M" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727683AbgIOT0G (ORCPT ); Tue, 15 Sep 2020 15:26:06 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:14932 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727987AbgIOTPO (ORCPT ); Tue, 15 Sep 2020 15:15:14 -0400 Received: from pps.filterd (m0187473.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 08FJ3sXg020021; Tue, 15 Sep 2020 15:15:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=pp1; bh=TRMSjIEPimcCRJtq8iscjWI+bZUem/C2Up3K9tOIwoc=; b=NoqdZB+MUfu06qlfiO+9JORxYKw63JfGpTNfE/n+MIXz10UBUGoHsn6Uu3IqKn9SDTxH tFiAzOYARIyK/rZVbEot+7kv/8Vf43oQAXCH5VHrdM9L1PnZhkEwH3ms36asp550moLo MkO3rZEfX98/1RzMxvt5P+IsgTzGsvXNz6KYgnTR5KX+9f2XG70s+OzQ4x6FlkpvKDzi 2Ji4PHUwioM+5a0U7vH1YuBggad9p01JMv10Lrdv8TGHq/8d6Hr3e8XyrQWkvTfm9jj8 bnbAgmqDqu758M59RpKSJKJunCbGud5En1MelAfLiSO8LSAaByfj1txWBX7v6C3bRgsQ Bw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 33k3bkgcsm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 15 Sep 2020 15:15:02 -0400 Received: from m0187473.ppops.net (m0187473.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 08FJ3ruJ019990; Tue, 15 Sep 2020 15:15:02 -0400 Received: from ppma04dal.us.ibm.com (7a.29.35a9.ip4.static.sl-reverse.com [169.53.41.122]) by mx0a-001b2d01.pphosted.com with ESMTP id 33k3bkgcs4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 15 Sep 2020 15:15:02 -0400 Received: from pps.filterd (ppma04dal.us.ibm.com [127.0.0.1]) by ppma04dal.us.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 08FJ8YL5024823; Tue, 15 Sep 2020 19:15:00 GMT Received: from b01cxnp23033.gho.pok.ibm.com (b01cxnp23033.gho.pok.ibm.com [9.57.198.28]) by ppma04dal.us.ibm.com with ESMTP id 33gny984jh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 15 Sep 2020 19:15:00 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp23033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 08FJF0Y756623468 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 15 Sep 2020 19:15:00 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 05722112062; Tue, 15 Sep 2020 19:15:00 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AE661112061; Tue, 15 Sep 2020 19:14:57 +0000 (GMT) Received: from oc4221205838.ibm.com (unknown [9.163.85.51]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 15 Sep 2020 19:14:57 +0000 (GMT) From: Matthew Rosato To: alex.williamson@redhat.com, cohuck@redhat.com Cc: pmorel@linux.ibm.com, schnelle@linux.ibm.com, rth@twiddle.net, david@redhat.com, thuth@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, mst@redhat.com, pbonzini@redhat.com, qemu-s390x@nongnu.org, qemu-devel@nongnu.org, kvm@vger.kernel.org Subject: [PATCH v3 3/5] vfio: Find DMA available capability Date: Tue, 15 Sep 2020 15:14:41 -0400 Message-Id: <1600197283-25274-4-git-send-email-mjrosato@linux.ibm.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1600197283-25274-1-git-send-email-mjrosato@linux.ibm.com> References: <1600197283-25274-1-git-send-email-mjrosato@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-09-15_13:2020-09-15,2020-09-15 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 mlxlogscore=836 priorityscore=1501 phishscore=0 clxscore=1015 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009150149 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The underlying host may be limiting the number of outstanding DMA requests for type 1 IOMMU. Add helper functions to check for the DMA available capability and retrieve the current number of DMA mappings allowed. Signed-off-by: Matthew Rosato Reviewed-by: Cornelia Huck --- hw/vfio/common.c | 31 +++++++++++++++++++++++++++++++ include/hw/vfio/vfio-common.h | 2 ++ 2 files changed, 33 insertions(+) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index eba7b55..50779f9 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -849,6 +849,37 @@ vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) return vfio_get_cap((void *)info, info->cap_offset, id); } +static struct vfio_info_cap_header * +vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id) +{ + if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) { + return NULL; + } + + return vfio_get_cap((void *)info, info->cap_offset, id); +} + +bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info, + unsigned int *avail) +{ + struct vfio_info_cap_header *hdr; + struct vfio_iommu_type1_info_dma_avail *cap; + + /* If the capability cannot be found, assume no DMA limiting */ + hdr = vfio_get_iommu_type1_info_cap(info, + VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL); + if (hdr == NULL) { + return false; + } + + if (avail != NULL) { + cap = (void *) hdr; + *avail = cap->avail; + } + + return true; +} + static int vfio_setup_region_sparse_mmaps(VFIORegion *region, struct vfio_region_info *info) { diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index c78f3ff..661a380 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -178,6 +178,8 @@ VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp); void vfio_put_group(VFIOGroup *group); int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vbasedev, Error **errp); +bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info, + unsigned int *avail); extern const MemoryRegionOps vfio_region_ops; typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList;