From patchwork Thu Apr 14 10:47:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 12813345 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id AB78CC433F5 for ; Thu, 14 Apr 2022 10:54:25 +0000 (UTC) Received: from localhost ([::1]:35740 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nex7I-0007Md-NN for qemu-devel@archiver.kernel.org; Thu, 14 Apr 2022 06:54:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55450) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nex0X-00024A-VH for qemu-devel@nongnu.org; Thu, 14 Apr 2022 06:47:25 -0400 Received: from mga12.intel.com ([192.55.52.136]:34772) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nex0V-0005Kn-Ks for qemu-devel@nongnu.org; Thu, 14 Apr 2022 06:47:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1649933243; x=1681469243; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=fzVg/TulejTLRtdp0hUfLMrxdcudhtYLzHSl9O78E70=; b=Cgferb4YefIWWyoLLhEaSwO/zd9sux+66dsIMPkhQHU3vBUAF+cTc8hM /ehLS6y2Vgyk/tHba1oVP5Oo0XdrALXuKoO49gXwSrRnxLp60uskU0SDy 5Ic911XA+yfhT1n0cHuXg9PHtcChT+Kq7gU3n1Od6xov5EXLaIiMI0hsb einLhuxKx4ph8DjiqPL5GiBkqpRlP3jijynnpttfrbJRlkA48Os8dr/Yq GYnOsSmxBVnkLfqml8P0lkGZat6Fk9e64VRAyqK2FW5jL3Q68v9RvsZn7 /tTZlGkbnneEb1CrpXJT4WasvQK1m8Iug3/YgyGeIRdTBNG9qXU9Trm4P g==; X-IronPort-AV: E=McAfee;i="6400,9594,10316"; a="242836493" X-IronPort-AV: E=Sophos;i="5.90,259,1643702400"; d="scan'208";a="242836493" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Apr 2022 03:47:17 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.90,259,1643702400"; d="scan'208";a="803091214" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by fmsmga006.fm.intel.com with ESMTP; 14 Apr 2022 03:47:16 -0700 From: Yi Liu To: alex.williamson@redhat.com, cohuck@redhat.com, qemu-devel@nongnu.org Subject: [RFC 08/18] vfio/container: Introduce vfio_[attach/detach]_device Date: Thu, 14 Apr 2022 03:47:00 -0700 Message-Id: <20220414104710.28534-9-yi.l.liu@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220414104710.28534-1-yi.l.liu@intel.com> References: <20220414104710.28534-1-yi.l.liu@intel.com> MIME-Version: 1.0 Received-SPF: pass client-ip=192.55.52.136; envelope-from=yi.l.liu@intel.com; helo=mga12.intel.com X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: akrowiak@linux.ibm.com, jjherne@linux.ibm.com, thuth@redhat.com, yi.l.liu@intel.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, jasowang@redhat.com, farman@linux.ibm.com, peterx@redhat.com, pasic@linux.ibm.com, eric.auger@redhat.com, yi.y.sun@intel.com, chao.p.peng@intel.com, nicolinc@nvidia.com, kevin.tian@intel.com, jgg@nvidia.com, eric.auger.pro@gmail.com, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Eric Auger We want the VFIO devices to be able to use two different IOMMU callbacks, the legacy VFIO one and the new iommufd one. Introduce vfio_[attach/detach]_device which aim at hiding the underlying IOMMU backend (IOCTLs, datatypes, ...). Once vfio_attach_device completes, the device is attached to a security context and its fd can be used. Conversely When vfio_detach_device completes, the device has been detached to the security context. In this patch, only the vfio-pci device gets converted to use the new API. Subsequent patches will handle other devices. Signed-off-by: Eric Auger Signed-off-by: Yi Liu --- hw/vfio/container.c | 65 +++++++++++++++++++++++++++++++++++ hw/vfio/pci.c | 50 +++------------------------ include/hw/vfio/vfio-common.h | 2 ++ 3 files changed, 72 insertions(+), 45 deletions(-) diff --git a/hw/vfio/container.c b/hw/vfio/container.c index 79972064d3..c74a3cd4ae 100644 --- a/hw/vfio/container.c +++ b/hw/vfio/container.c @@ -1214,6 +1214,71 @@ int vfio_eeh_as_op(AddressSpace *as, uint32_t op) return vfio_eeh_container_op(container, op); } +static int vfio_device_groupid(VFIODevice *vbasedev, Error **errp) +{ + char *tmp, group_path[PATH_MAX], *group_name; + int ret, groupid; + ssize_t len; + + tmp = g_strdup_printf("%s/iommu_group", vbasedev->sysfsdev); + len = readlink(tmp, group_path, sizeof(group_path)); + g_free(tmp); + + if (len <= 0 || len >= sizeof(group_path)) { + ret = len < 0 ? -errno : -ENAMETOOLONG; + error_setg_errno(errp, -ret, "no iommu_group found"); + return ret; + } + + group_path[len] = 0; + + group_name = basename(group_path); + if (sscanf(group_name, "%d", &groupid) != 1) { + error_setg_errno(errp, errno, "failed to read %s", group_path); + return -errno; + } + return groupid; +} + +int vfio_attach_device(VFIODevice *vbasedev, AddressSpace *as, Error **errp) +{ + int groupid = vfio_device_groupid(vbasedev, errp); + VFIODevice *vbasedev_iter; + VFIOGroup *group; + int ret; + + if (groupid < 0) { + return groupid; + } + + trace_vfio_realize(vbasedev->name, groupid); + group = vfio_get_group(groupid, as, errp); + if (!group) { + return -1; + } + + QLIST_FOREACH(vbasedev_iter, &group->device_list, next) { + if (strcmp(vbasedev_iter->name, vbasedev->name) == 0) { + error_setg(errp, "device is already attached"); + vfio_put_group(group); + return -1; + } + } + ret = vfio_get_device(group, vbasedev->name, vbasedev, errp); + if (ret) { + vfio_put_group(group); + return -1; + } + + return 0; +} + +void vfio_detach_device(VFIODevice *vbasedev) +{ + vfio_put_base_device(vbasedev); + vfio_put_group(vbasedev->group); +} + static void vfio_legacy_container_class_init(ObjectClass *klass, void *data) { diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index a00a485e46..0363f81017 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -2654,10 +2654,9 @@ static void vfio_populate_device(VFIOPCIDevice *vdev, Error **errp) static void vfio_put_device(VFIOPCIDevice *vdev) { - g_free(vdev->vbasedev.name); g_free(vdev->msix); - vfio_put_base_device(&vdev->vbasedev); + vfio_detach_device(&vdev->vbasedev); } static void vfio_err_notifier_handler(void *opaque) @@ -2804,13 +2803,9 @@ static void vfio_realize(PCIDevice *pdev, Error **errp) { VFIOPCIDevice *vdev = VFIO_PCI(pdev); VFIODevice *vbasedev = &vdev->vbasedev; - VFIODevice *vbasedev_iter; - VFIOGroup *group; - char *tmp, *subsys, group_path[PATH_MAX], *group_name; + char *tmp, *subsys; Error *err = NULL; - ssize_t len; struct stat st; - int groupid; int i, ret; bool is_mdev; @@ -2839,39 +2834,6 @@ static void vfio_realize(PCIDevice *pdev, Error **errp) vbasedev->type = VFIO_DEVICE_TYPE_PCI; vbasedev->dev = DEVICE(vdev); - tmp = g_strdup_printf("%s/iommu_group", vbasedev->sysfsdev); - len = readlink(tmp, group_path, sizeof(group_path)); - g_free(tmp); - - if (len <= 0 || len >= sizeof(group_path)) { - error_setg_errno(errp, len < 0 ? errno : ENAMETOOLONG, - "no iommu_group found"); - goto error; - } - - group_path[len] = 0; - - group_name = basename(group_path); - if (sscanf(group_name, "%d", &groupid) != 1) { - error_setg_errno(errp, errno, "failed to read %s", group_path); - goto error; - } - - trace_vfio_realize(vbasedev->name, groupid); - - group = vfio_get_group(groupid, pci_device_iommu_address_space(pdev), errp); - if (!group) { - goto error; - } - - QLIST_FOREACH(vbasedev_iter, &group->device_list, next) { - if (strcmp(vbasedev_iter->name, vbasedev->name) == 0) { - error_setg(errp, "device is already attached"); - vfio_put_group(group); - goto error; - } - } - /* * Mediated devices *might* operate compatibly with discarding of RAM, but * we cannot know for certain, it depends on whether the mdev vendor driver @@ -2889,13 +2851,12 @@ static void vfio_realize(PCIDevice *pdev, Error **errp) if (vbasedev->ram_block_discard_allowed && !is_mdev) { error_setg(errp, "x-balloon-allowed only potentially compatible " "with mdev devices"); - vfio_put_group(group); goto error; } - ret = vfio_get_device(group, vbasedev->name, vbasedev, errp); + ret = vfio_attach_device(vbasedev, + pci_device_iommu_address_space(pdev), errp); if (ret) { - vfio_put_group(group); goto error; } @@ -3124,12 +3085,12 @@ out_teardown: vfio_bars_exit(vdev); error: error_prepend(errp, VFIO_MSG_PREFIX, vbasedev->name); + vfio_detach_device(vbasedev); } static void vfio_instance_finalize(Object *obj) { VFIOPCIDevice *vdev = VFIO_PCI(obj); - VFIOGroup *group = vdev->vbasedev.group; vfio_display_finalize(vdev); vfio_bars_finalize(vdev); @@ -3143,7 +3104,6 @@ static void vfio_instance_finalize(Object *obj) * g_free(vdev->igd_opregion); */ vfio_put_device(vdev); - vfio_put_group(group); } static void vfio_exitfn(PCIDevice *pdev) diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index 02a6f36a9e..978b2c2f6e 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -180,6 +180,8 @@ 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); +int vfio_attach_device(VFIODevice *vbasedev, AddressSpace *as, Error **errp); +void vfio_detach_device(VFIODevice *vbasedev); extern const MemoryRegionOps vfio_region_ops; typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList;