From nobody Sun Feb 8 20:17:49 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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=intel.com ARC-Seal: i=1; a=rsa-sha256; t=1594553216; cv=none; d=zohomail.com; s=zohoarc; b=eHzRlal+ZP8FdOkZD/ILVJCAzgfbzv7cPJiLR1urkNSy2Vg5TmMWXImAXe+GLvUSCX65pWIZn+K2dF1uVVGic+1AedXZMDVDCd1L4q2ITGoNxBLoSX4LurJYPTcXqr2uVAGxERYr6xEYjTMGKdq8+WeRkpXd3CT5eCHZCgVE5ok= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1594553216; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=Z9ElTV/s/J8kl9Y8j0RaTkwkAgIzg2VnedEMpsvt80g=; b=EaDsZnj7+7H4RVChxE7aubFayc/AiPczLYEN1yBJ0cDgUsy3xu1I/rTnit5813TtSxsdBI6xbbgxAVnEhQ9xT9EkrBwSp2xcYPYfMaQgZhKvUGMJa0xPz83uY5I5I+godnkJBZL1Lv+rdcpqweqUjnN6LlGyCuOv1fDIrlU6IA0= ARC-Authentication-Results: i=1; mx.zohomail.com; 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 159455321685118.73821800805979; Sun, 12 Jul 2020 04:26:56 -0700 (PDT) Received: from localhost ([::1]:51330 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jua8F-0004ck-4i for importer@patchew.org; Sun, 12 Jul 2020 07:26:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49580) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jua1j-00036C-0k for qemu-devel@nongnu.org; Sun, 12 Jul 2020 07:20:11 -0400 Received: from mga03.intel.com ([134.134.136.65]:51218) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jua1e-0004uN-VA for qemu-devel@nongnu.org; Sun, 12 Jul 2020 07:20:10 -0400 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jul 2020 04:19:47 -0700 Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by fmsmga004.fm.intel.com with ESMTP; 12 Jul 2020 04:19:47 -0700 IronPort-SDR: vy0ZFNp1U3Mywu+GxHSie5GyIHKGhX0AgK4Xcuf2F3XAsNFGop8rYs+9351Hv8fu2PXQ9Davba 20DbEMRCnNAw== X-IronPort-AV: E=McAfee;i="6000,8403,9679"; a="148490168" X-IronPort-AV: E=Sophos;i="5.75,343,1589266800"; d="scan'208";a="148490168" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False IronPort-SDR: Lc6heOYbVWVkGyykiJeckSv7d1IbzJuSh7qXyey85q5wkY3e6McIw/kx0albfFaHP08OSVwK/c dW/eZSi5hJwg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,343,1589266800"; d="scan'208";a="307121418" From: Liu Yi L To: qemu-devel@nongnu.org, alex.williamson@redhat.com, peterx@redhat.com Subject: [RFC v8 12/25] vfio: init HostIOMMUContext per-container Date: Sun, 12 Jul 2020 04:26:08 -0700 Message-Id: <1594553181-55810-13-git-send-email-yi.l.liu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1594553181-55810-1-git-send-email-yi.l.liu@intel.com> References: <1594553181-55810-1-git-send-email-yi.l.liu@intel.com> 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; Received-SPF: pass client-ip=134.134.136.65; envelope-from=yi.l.liu@intel.com; helo=mga03.intel.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/12 07:19:41 X-ACL-Warn: Detected OS = FreeBSD 9.x or newer [fuzzy] X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: jean-philippe@linaro.org, kevin.tian@intel.com, yi.l.liu@intel.com, Yi Sun , kvm@vger.kernel.org, mst@redhat.com, jun.j.tian@intel.com, eric.auger@redhat.com, yi.y.sun@intel.com, Jacob Pan , pbonzini@redhat.com, hao.wu@intel.com, jasowang@redhat.com, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" In this patch, QEMU firstly gets iommu info from kernel to check the supported capabilities by a VFIO_IOMMU_TYPE1_NESTING iommu. And inits HostIOMMUContet instance. For vfio-pci devices, it could use pci_device_set/unset_iommu() to expose host iommu context to vIOMMU emulators. vIOMMU emulators could make use the methods provided by host iommu context. e.g. propagate requests to host iommu. Cc: Kevin Tian Cc: Jacob Pan Cc: Peter Xu Cc: Eric Auger Cc: Yi Sun Cc: David Gibson Cc: Alex Williamson Signed-off-by: Liu Yi L --- hw/vfio/common.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++= ++++ hw/vfio/pci.c | 17 +++++++++ 2 files changed, 130 insertions(+) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 7b92a58..cdd16a1 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -1228,10 +1228,102 @@ static int vfio_host_iommu_ctx_pasid_free(HostIOMM= UContext *iommu_ctx, return ret; } =20 +/** + * Get iommu info from host. Caller of this funcion should free + * the memory pointed by the returned pointer stored in @info + * after a successful calling when finished its usage. + */ +static int vfio_get_iommu_info(VFIOContainer *container, + struct vfio_iommu_type1_info **info) +{ + + size_t argsz =3D sizeof(struct vfio_iommu_type1_info); + + *info =3D g_malloc0(argsz); + +retry: + (*info)->argsz =3D argsz; + + if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) { + g_free(*info); + *info =3D NULL; + return -errno; + } + + if (((*info)->argsz > argsz)) { + argsz =3D (*info)->argsz; + *info =3D g_realloc(*info, argsz); + goto retry; + } + + return 0; +} + +static struct vfio_info_cap_header * +vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id) +{ + struct vfio_info_cap_header *hdr; + void *ptr =3D info; + + if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) { + return NULL; + } + + for (hdr =3D ptr + info->cap_offset; hdr !=3D ptr; hdr =3D ptr + hdr->= next) { + if (hdr->id =3D=3D id) { + return hdr; + } + } + + return NULL; +} + +static int vfio_get_nesting_iommu_cap(VFIOContainer *container, + struct vfio_iommu_type1_info_cap_nesting **cap_nesting) +{ + struct vfio_iommu_type1_info *info; + struct vfio_info_cap_header *hdr; + struct vfio_iommu_type1_info_cap_nesting *cap; + struct iommu_nesting_info *nest_info; + int ret; + uint32_t minsz, cap_size; + + ret =3D vfio_get_iommu_info(container, &info); + if (ret) { + return ret; + } + + hdr =3D vfio_get_iommu_info_cap(info, + VFIO_IOMMU_TYPE1_INFO_CAP_NESTING); + if (!hdr) { + g_free(info); + return -EINVAL; + } + + cap =3D container_of(hdr, + struct vfio_iommu_type1_info_cap_nesting, header); + + nest_info =3D &cap->info; + minsz =3D offsetof(struct iommu_nesting_info, data); + if (nest_info->size < minsz) { + g_free(info); + return -EINVAL; + } + + cap_size =3D offsetof(struct vfio_iommu_type1_info_cap_nesting, info) + + nest_info->size; + *cap_nesting =3D g_malloc0(cap_size); + memcpy(*cap_nesting, cap, cap_size); + + g_free(info); + return 0; +} + static int vfio_init_container(VFIOContainer *container, int group_fd, bool want_nested, Error **errp) { int iommu_type, ret; + uint64_t flags =3D 0; =20 iommu_type =3D vfio_get_iommu_type(container, want_nested, errp); if (iommu_type < 0) { @@ -1259,6 +1351,27 @@ static int vfio_init_container(VFIOContainer *contai= ner, int group_fd, return -errno; } =20 + if (iommu_type =3D=3D VFIO_TYPE1_NESTING_IOMMU) { + struct vfio_iommu_type1_info_cap_nesting *nesting =3D NULL; + struct iommu_nesting_info *nest_info; + + ret =3D vfio_get_nesting_iommu_cap(container, &nesting); + if (ret) { + error_setg_errno(errp, -ret, + "Failed to get nesting iommu cap"); + return ret; + } + + nest_info =3D (struct iommu_nesting_info *) &nesting->info; + flags |=3D (nest_info->features & IOMMU_NESTING_FEAT_SYSWIDE_PASID= ) ? + HOST_IOMMU_PASID_REQUEST : 0; + host_iommu_ctx_init(&container->iommu_ctx, + sizeof(container->iommu_ctx), + TYPE_VFIO_HOST_IOMMU_CONTEXT, + flags); + g_free(nesting); + } + container->iommu_type =3D iommu_type; return 0; } diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 9d8d27f..b7045f0 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -2710,6 +2710,7 @@ static void vfio_realize(PCIDevice *pdev, Error **err= p) VFIOPCIDevice *vdev =3D PCI_VFIO(pdev); VFIODevice *vbasedev_iter; VFIOGroup *group; + VFIOContainer *container; char *tmp, *subsys, group_path[PATH_MAX], *group_name; Error *err =3D NULL; ssize_t len; @@ -2787,6 +2788,15 @@ static void vfio_realize(PCIDevice *pdev, Error **er= rp) goto error; } =20 + container =3D group->container; + if (container->iommu_ctx.initialized && + pci_device_set_iommu_context(pdev, &container->iommu_ctx)) { + error_setg(errp, "device attachment is denied by vIOMMU, " + "please check host IOMMU nesting capability"); + vfio_put_group(group); + goto error; + } + QLIST_FOREACH(vbasedev_iter, &group->device_list, next) { if (strcmp(vbasedev_iter->name, vdev->vbasedev.name) =3D=3D 0) { error_setg(errp, "device is already attached"); @@ -3072,9 +3082,16 @@ static void vfio_instance_finalize(Object *obj) static void vfio_exitfn(PCIDevice *pdev) { VFIOPCIDevice *vdev =3D PCI_VFIO(pdev); + VFIOContainer *container; =20 vfio_unregister_req_notifier(vdev); vfio_unregister_err_notifier(vdev); + + container =3D vdev->vbasedev.group->container; + if (container->iommu_ctx.initialized) { + pci_device_unset_iommu_context(pdev); + } + pci_device_set_intx_routing_notifier(&vdev->pdev, NULL); if (vdev->irqchip_change_notifier.notify) { kvm_irqchip_remove_change_notifier(&vdev->irqchip_change_notifier); --=20 2.7.4