From patchwork Tue Nov 21 08:44:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Duan, Zhenzhong" X-Patchwork-Id: 13462613 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 CF83EC5ACB3 for ; Tue, 21 Nov 2023 08:47:40 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r5MPj-0006U6-J4; Tue, 21 Nov 2023 03:47:23 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r5MPi-0006T6-61 for qemu-devel@nongnu.org; Tue, 21 Nov 2023 03:47:22 -0500 Received: from mgamail.intel.com ([134.134.136.65]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r5MPg-0001e9-FP for qemu-devel@nongnu.org; Tue, 21 Nov 2023 03:47:21 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700556440; x=1732092440; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=dd2xEWWk0YPsEf75LQpuy0bDEAZE9RO0Ebhfbs3ZVWA=; b=f1zA5sUTr7BTW4At485dAoIHIfRrasPSgqfho98zwR/ln7Mr+cLZRueD D/Wfn7PMCMENm8nrPDlE6+2PmWOaMYVmeJV2nLCXwv36ir2QqZ4nM2imo 9ZHznmavnwM67OoGyrEiRaAe4oIXhg/vToB3uFp++wqlLtumxjTFdV8JG 6gxpZo4SwSBV3w1dDHIauGKavMAB3bD/4zTjaR6UtR2lW+5s+YvAd+Bv+ 7dbEgU60Fum51fIKAKEO4fvYpdrBA0mhJVzSo6KNCa35uHnicL2FxEdLI KqwZ64HZrNaGLcK7HdEwH2ehfTFnnGjrIjUrr8TyZH5WPHfCrhnm5Y485 g==; X-IronPort-AV: E=McAfee;i="6600,9927,10900"; a="395722157" X-IronPort-AV: E=Sophos;i="6.04,215,1695711600"; d="scan'208";a="395722157" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Nov 2023 00:47:15 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10900"; a="884124976" X-IronPort-AV: E=Sophos;i="6.04,215,1695711600"; d="scan'208";a="884124976" Received: from spr-s2600bt.bj.intel.com ([10.240.192.124]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Nov 2023 00:47:10 -0800 From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com, joao.m.martins@oracle.com, eric.auger@redhat.com, peterx@redhat.com, jasowang@redhat.com, kevin.tian@intel.com, yi.l.liu@intel.com, yi.y.sun@intel.com, chao.p.peng@intel.com Subject: [PATCH v7 13/27] vfio/platform: Make vfio cdev pre-openable by passing a file handle Date: Tue, 21 Nov 2023 16:44:12 +0800 Message-Id: <20231121084426.1286987-14-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231121084426.1286987-1-zhenzhong.duan@intel.com> References: <20231121084426.1286987-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 Received-SPF: pass client-ip=134.134.136.65; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.035, 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_NONE=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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org This gives management tools like libvirt a chance to open the vfio cdev with privilege and pass FD to qemu. This way qemu never needs to have privilege to open a VFIO or iommu cdev node. Signed-off-by: Zhenzhong Duan Reviewed-by: Cédric Le Goater --- hw/vfio/platform.c | 32 ++++++++++++++++++++++++-------- 1 file changed, 24 insertions(+), 8 deletions(-) diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c index 98ae4bc655..a97d9c6234 100644 --- a/hw/vfio/platform.c +++ b/hw/vfio/platform.c @@ -531,14 +531,13 @@ static VFIODeviceOps vfio_platform_ops = { */ static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp) { - struct stat st; int ret; - /* @sysfsdev takes precedence over @host */ - if (vbasedev->sysfsdev) { + /* @fd takes precedence over @sysfsdev which takes precedence over @host */ + if (vbasedev->fd < 0 && vbasedev->sysfsdev) { g_free(vbasedev->name); vbasedev->name = g_path_get_basename(vbasedev->sysfsdev); - } else { + } else if (vbasedev->fd < 0) { if (!vbasedev->name || strchr(vbasedev->name, '/')) { error_setg(errp, "wrong host device name"); return -EINVAL; @@ -548,10 +547,9 @@ static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp) vbasedev->name); } - if (stat(vbasedev->sysfsdev, &st) < 0) { - error_setg_errno(errp, errno, - "failed to get the sysfs host device file status"); - return -errno; + ret = vfio_device_get_name(vbasedev, errp); + if (ret) { + return ret; } ret = vfio_attach_device(vbasedev->name, vbasedev, @@ -658,6 +656,20 @@ static Property vfio_platform_dev_properties[] = { DEFINE_PROP_END_OF_LIST(), }; +static void vfio_platform_instance_init(Object *obj) +{ + VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(obj); + + vdev->vbasedev.fd = -1; +} + +#ifdef CONFIG_IOMMUFD +static void vfio_platform_set_fd(Object *obj, const char *str, Error **errp) +{ + vfio_device_set_fd(&VFIO_PLATFORM_DEVICE(obj)->vbasedev, str, errp); +} +#endif + static void vfio_platform_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); @@ -665,6 +677,9 @@ static void vfio_platform_class_init(ObjectClass *klass, void *data) dc->realize = vfio_platform_realize; device_class_set_props(dc, vfio_platform_dev_properties); +#ifdef CONFIG_IOMMUFD + object_class_property_add_str(klass, "fd", NULL, vfio_platform_set_fd); +#endif dc->vmsd = &vfio_platform_vmstate; dc->desc = "VFIO-based platform device assignment"; sbc->connect_irq_notifier = vfio_start_irqfd_injection; @@ -677,6 +692,7 @@ static const TypeInfo vfio_platform_dev_info = { .name = TYPE_VFIO_PLATFORM, .parent = TYPE_SYS_BUS_DEVICE, .instance_size = sizeof(VFIOPlatformDevice), + .instance_init = vfio_platform_instance_init, .class_init = vfio_platform_class_init, .class_size = sizeof(VFIOPlatformDeviceClass), };