From patchwork Sun Mar 22 12:36:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 11451765 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 1D2E86CA for ; Sun, 22 Mar 2020 12:39:26 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E9978206F8 for ; Sun, 22 Mar 2020 12:39:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E9978206F8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:46040 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jFzsy-0006qK-QC for patchwork-qemu-devel@patchwork.kernel.org; Sun, 22 Mar 2020 08:39:25 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47929) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jFzko-0000yq-Oy for qemu-devel@nongnu.org; Sun, 22 Mar 2020 08:31:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jFzkm-0003uI-QV for qemu-devel@nongnu.org; Sun, 22 Mar 2020 08:30:58 -0400 Received: from mga11.intel.com ([192.55.52.93]:51492) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jFzkm-0003ry-HO for qemu-devel@nongnu.org; Sun, 22 Mar 2020 08:30:56 -0400 IronPort-SDR: yy7Vvlx/ijGKn8pfeoaTjtnI3dIu6MRbKiBIfZ1WV7OENlhXWfCQZ8Np753KsuGq8ux3eazZ72 KaXEHxHUejww== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Mar 2020 05:30:38 -0700 IronPort-SDR: V/nzAlH9YqHMTcQkZyxThK6ne48aqyQs4WOfCN84p6KT3j4E3B4rCPLfCfapymZhPVUusNrfsx 8gAn6nhB0UOQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,292,1580803200"; d="scan'208";a="239664377" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga008.jf.intel.com with ESMTP; 22 Mar 2020 05:30:38 -0700 From: Liu Yi L To: qemu-devel@nongnu.org, alex.williamson@redhat.com, peterx@redhat.com Subject: [PATCH v1 09/22] vfio/common: check PASID alloc/free availability Date: Sun, 22 Mar 2020 05:36:06 -0700 Message-Id: <1584880579-12178-10-git-send-email-yi.l.liu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1584880579-12178-1-git-send-email-yi.l.liu@intel.com> References: <1584880579-12178-1-git-send-email-yi.l.liu@intel.com> X-detected-operating-system: by eggs.gnu.org: FreeBSD 9.x [fuzzy] X-Received-From: 192.55.52.93 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, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" VFIO exposes host IOMMU dual-stage DMA translation programming capability to userspace by VFIO_TYPE1_NESTING_IOMMU type. However, userspace needs more info on the nesting type. e.g. the supported stage 1 format and PASID alloc/free request availability. This patch gets the iommu nesting cap info from kernel by using IOCTL VFIO_IOMMU_GET_INFO. And checks the HOST_IOMMU_PASID_REQUEST bit in the nesting capabilities. This patch referred some code from Shameer Kolothum. https://lists.gnu.org/archive/html/qemu-devel/2018-05/msg03759.html Cc: Kevin Tian Cc: Jacob Pan Cc: Peter Xu Cc: Eric Auger Cc: Yi Sun Cc: David Gibson Cc: Alex Williamson Signed-off-by: Shameer Kolothum Signed-off-by: Liu Yi L --- hw/vfio/common.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 91 insertions(+), 5 deletions(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index e4f5f10..e0f2828 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -1223,6 +1223,84 @@ static int vfio_host_icx_pasid_free(HostIOMMUContext *host_icx, return 0; } +/** + * 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 = sizeof(struct vfio_iommu_type1_info); + + *info = g_malloc0(argsz); + +retry: + (*info)->argsz = argsz; + + if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) { + g_free(*info); + *info = NULL; + return -errno; + } + + if (((*info)->argsz > argsz)) { + argsz = (*info)->argsz; + *info = 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 = info; + + if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) { + return NULL; + } + + for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { + if (hdr->id == 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; + int ret; + + ret = vfio_get_iommu_info(container, &info); + if (ret) { + return ret; + } + + hdr = vfio_get_iommu_info_cap(info, + VFIO_IOMMU_TYPE1_INFO_CAP_NESTING); + if (!hdr) { + g_free(info); + return -errno; + } + + cap = container_of(hdr, + struct vfio_iommu_type1_info_cap_nesting, header); + *cap_nesting = *cap; + + g_free(info); + return 0; +} + static int vfio_init_container(VFIOContainer *container, int group_fd, Error **errp) { @@ -1256,11 +1334,19 @@ static int vfio_init_container(VFIOContainer *container, int group_fd, } if (iommu_type == VFIO_TYPE1_NESTING_IOMMU) { - /* - * TODO: config flags per host IOMMU nesting capability - * e.g. check if VFIO_TYPE1_NESTING_IOMMU supports PASID - * alloc/free - */ + struct vfio_iommu_type1_info_cap_nesting nesting = { + .nesting_capabilities = 0x0, + .stage1_formats = 0, }; + + ret = vfio_get_nesting_iommu_cap(container, &nesting); + if (ret) { + error_setg_errno(errp, -ret, + "Failed to get nesting iommu cap"); + return ret; + } + + flags |= (nesting.nesting_capabilities & VFIO_IOMMU_PASID_REQS) ? + HOST_IOMMU_PASID_REQUEST : 0; host_iommu_ctx_init(&container->host_icx, sizeof(container->host_icx), TYPE_VFIO_HOST_IOMMU_CONTEXT,