From patchwork Thu Oct 26 10:31:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Duan, Zhenzhong" X-Patchwork-Id: 13437483 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 9B754C25B6B for ; Thu, 26 Oct 2023 10:49:58 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qvxvh-0004zW-VG; Thu, 26 Oct 2023 06:49:34 -0400 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 1qvxvg-0004vc-Bn; Thu, 26 Oct 2023 06:49:32 -0400 Received: from mgamail.intel.com ([134.134.136.126]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qvxve-0001PR-IC; Thu, 26 Oct 2023 06:49:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1698317370; x=1729853370; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=0DEzYUesEZNzx3C3dtdSO+Zao1RRZKEyYyRWPcjm4IA=; b=BceY/jUS54DAnUzu8BYhwk1wnPM9uL7BCA0EBHgdEcvoVMP5goDXJMd8 ZYwc3jQwlPXV3x9Rp5sro33zaZbF/CmizRz9gmZ2GT4A2yK/vZJ5Y+9QW wzzNXGwE79C2+iLN/btG9Un6MZkgx1SKwMUidGZ3kisOXLX+xXxYR3sra Cn1THIhJna8dgDDMbcTcel3MkTR/j8pjk4A1UFuWJMyE5DtkEH+5BpMGw 9zcQeqPGtdrP21qgtIxtlmOAeMJqCgODeITRqZ0f7hLAoI/yYfSrQrrFY JdiY7eLrBaMUPmbj1G8001egYO4LD0LCa+tXl4/dtkP4gMhwZXiKSq1PH w==; X-IronPort-AV: E=McAfee;i="6600,9927,10874"; a="372563893" X-IronPort-AV: E=Sophos;i="6.03,253,1694761200"; d="scan'208";a="372563893" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Oct 2023 03:48:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,253,1694761200"; d="scan'208";a="463892" Received: from duan-server-s2600bt.bj.intel.com ([10.240.192.147]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Oct 2023 03:48:19 -0700 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, Zhenzhong Duan , Thomas Huth , Tony Krowiak , Halil Pasic , Jason Herne , qemu-s390x@nongnu.org (open list:S390 general arch...) Subject: [PATCH v3 36/37] vfio/ap: Make vfio cdev pre-openable by passing a file handle Date: Thu, 26 Oct 2023 18:31:03 +0800 Message-Id: <20231026103104.1686921-37-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231026103104.1686921-1-zhenzhong.duan@intel.com> References: <20231026103104.1686921-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 Received-SPF: pass client-ip=134.134.136.126; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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: 2.1.29 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. Opportunisticly, remove some unnecessory double-cast. Signed-off-by: Zhenzhong Duan Signed-off-by: Cédric Le Goater --- hw/vfio/ap.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c index 6a4186ccd3..0a810f8b88 100644 --- a/hw/vfio/ap.c +++ b/hw/vfio/ap.c @@ -29,6 +29,7 @@ #include "hw/s390x/ap-bridge.h" #include "exec/address-spaces.h" #include "qom/object.h" +#include "monitor/monitor.h" #define TYPE_VFIO_AP_DEVICE "vfio-ap" @@ -159,7 +160,10 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp) VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev); VFIODevice *vbasedev = &vapdev->vdev; - vbasedev->name = g_path_get_basename(vbasedev->sysfsdev); + if (vfio_device_get_name(vbasedev, errp)) { + return; + } + vbasedev->ops = &vfio_ap_ops; vbasedev->type = VFIO_DEVICE_TYPE_AP; vbasedev->dev = dev; @@ -229,11 +233,36 @@ static const VMStateDescription vfio_ap_vmstate = { .unmigratable = 1, }; +static void vfio_ap_instance_init(Object *obj) +{ + VFIOAPDevice *vapdev = VFIO_AP_DEVICE(obj); + + vapdev->vdev.fd = -1; +} + +#ifdef CONFIG_IOMMUFD +static void vfio_ap_set_fd(Object *obj, const char *str, Error **errp) +{ + VFIOAPDevice *vapdev = VFIO_AP_DEVICE(obj); + int fd = -1; + + fd = monitor_fd_param(monitor_cur(), str, errp); + if (fd == -1) { + error_prepend(errp, "Could not parse remote object fd %s:", str); + return; + } + vapdev->vdev.fd = fd; +} +#endif + static void vfio_ap_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); device_class_set_props(dc, vfio_ap_properties); +#ifdef CONFIG_IOMMUFD + object_class_property_add_str(klass, "fd", NULL, vfio_ap_set_fd); +#endif dc->vmsd = &vfio_ap_vmstate; dc->desc = "VFIO-based AP device assignment"; set_bit(DEVICE_CATEGORY_MISC, dc->categories); @@ -248,6 +277,7 @@ static const TypeInfo vfio_ap_info = { .name = TYPE_VFIO_AP_DEVICE, .parent = TYPE_AP_DEVICE, .instance_size = sizeof(VFIOAPDevice), + .instance_init = vfio_ap_instance_init, .class_init = vfio_ap_class_init, };