From nobody Tue Feb 10 05:26:43 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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; spf=pass (zoho.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=1562867120; cv=none; d=zoho.com; s=zohoarc; b=YELHF8Jl8xB2Ewlo3MibEl3fQVyQSwt/oRnWteI1cOXjvXW01Ood3SM2qjZwFwuXJWXyBMC86pxu0xX+20woxa7UmUhIT+bVr3W/fwz/28ZK2+ClVf61vSN//ergOrSwkZZAi0fyaJIBxzwGQUMJdRlwZohFmA+jm9/kKErna1M= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1562867120; h=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:ARC-Authentication-Results; bh=Q0Q0+oEx/M3sseCacMLiUjQWZp/GbVsZk0Ac7TNVUSI=; b=MXssMOvEutBgq07oDivg4QeyTilQevnq6DL9jYG/ShjeHcmuZimRjoCWhYu0Vk+g+2HMAZqhfZFWJCeyfF7AcmaqLLOa4Q13FwyThtQCYGU5LJKyDfsT51KDLf26bMwtDKuAVT1Vsqlza7PVqJqcZ3zh9uw2E2KnCDu66qc99aM= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.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 1562867120721719.6520745774463; Thu, 11 Jul 2019 10:45:20 -0700 (PDT) Received: from localhost ([::1]:44340 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hld89-0004WD-55 for importer@patchew.org; Thu, 11 Jul 2019 13:45:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38611) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hld4a-0006Ah-KC for qemu-devel@nongnu.org; Thu, 11 Jul 2019 13:41:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hld4Z-0005AG-6x for qemu-devel@nongnu.org; Thu, 11 Jul 2019 13:41:36 -0400 Received: from mx1.redhat.com ([209.132.183.28]:36022) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hld4T-000512-9c; Thu, 11 Jul 2019 13:41:31 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 37759308A98D; Thu, 11 Jul 2019 17:41:27 +0000 (UTC) Received: from laptop.redhat.com (ovpn-116-46.ams2.redhat.com [10.36.116.46]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0E4076092E; Thu, 11 Jul 2019 17:41:14 +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 Date: Thu, 11 Jul 2019 19:39:18 +0200 Message-Id: <20190711173933.31203-15-eric.auger@redhat.com> In-Reply-To: <20190711173933.31203-1-eric.auger@redhat.com> References: <20190711173933.31203-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Thu, 11 Jul 2019 17:41:27 +0000 (UTC) Content-Transfer-Encoding: quoted-printable 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 v5 14/29] vfio: Force nested if iommu requires it 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: drjones@redhat.com, yi.l.liu@intel.com, mst@redhat.com, jean-philippe.brucker@arm.com, zhangfei.gao@foxmail.com, peterx@redhat.com, alex.williamson@redhat.com, vincent.stehle@arm.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" In case we detect the address space is translated by a virtual IOMMU which requires HW nested paging to integrate with VFIO, let's set up the container with the VFIO_TYPE1_NESTING_IOMMU iommu_type. Signed-off-by: Eric Auger --- v4 -> v5: - fail immediatly if nested is wanted but not supported v2 -> v3: - add "nested only is selected if requested by @force_nested" comment in this patch --- hw/vfio/common.c | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index d622191fe6..46a1a089a4 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -1144,27 +1144,38 @@ static void vfio_put_address_space(VFIOAddressSpace= *space) * vfio_get_iommu_type - selects the richest iommu_type (v2 first) */ static int vfio_get_iommu_type(VFIOContainer *container, + bool want_nested, Error **errp) { - int iommu_types[] =3D { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, + int iommu_types[] =3D { VFIO_TYPE1_NESTING_IOMMU, + VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; - int i; + int i, ret =3D -EINVAL; =20 for (i =3D 0; i < ARRAY_SIZE(iommu_types); i++) { if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { - return iommu_types[i]; + if (iommu_types[i] =3D=3D VFIO_TYPE1_NESTING_IOMMU && !want_ne= sted) { + continue; + } + ret =3D iommu_types[i]; + break; } } - error_setg(errp, "No available IOMMU models"); - return -EINVAL; + if (ret < 0) { + error_setg(errp, "No available IOMMU models"); + } else if (want_nested && ret !=3D VFIO_TYPE1_NESTING_IOMMU) { + error_setg(errp, "Nested mode requested but not supported"); + ret =3D -EINVAL; + } + return ret; } =20 static int vfio_init_container(VFIOContainer *container, int group_fd, - Error **errp) + bool want_nested, Error **errp) { int iommu_type, ret; =20 - iommu_type =3D vfio_get_iommu_type(container, errp); + iommu_type =3D vfio_get_iommu_type(container, want_nested, errp); if (iommu_type < 0) { return iommu_type; } @@ -1200,6 +1211,14 @@ static int vfio_connect_container(VFIOGroup *group, = AddressSpace *as, VFIOContainer *container; int ret, fd; VFIOAddressSpace *space; + IOMMUMemoryRegion *iommu_mr; + bool nested =3D false; + + if (as !=3D &address_space_memory && memory_region_is_iommu(as->root))= { + iommu_mr =3D IOMMU_MEMORY_REGION(as->root); + memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_VFIO_NESTED, + (void *)&nested); + } =20 space =3D vfio_get_address_space(as); =20 @@ -1260,12 +1279,13 @@ static int vfio_connect_container(VFIOGroup *group,= AddressSpace *as, QLIST_INIT(&container->giommu_list); QLIST_INIT(&container->hostwin_list); =20 - ret =3D vfio_init_container(container, group->fd, errp); + ret =3D vfio_init_container(container, group->fd, nested, errp); if (ret) { goto free_container_exit; } =20 switch (container->iommu_type) { + case VFIO_TYPE1_NESTING_IOMMU: case VFIO_TYPE1v2_IOMMU: case VFIO_TYPE1_IOMMU: { --=20 2.20.1