From patchwork Thu Feb 9 04:31:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13133951 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C155C61DA4 for ; Thu, 9 Feb 2023 04:34:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230265AbjBIEeA (ORCPT ); Wed, 8 Feb 2023 23:34:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47450 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229777AbjBIEdk (ORCPT ); Wed, 8 Feb 2023 23:33:40 -0500 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4B584402E6; Wed, 8 Feb 2023 20:32:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1675917152; x=1707453152; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=k19+8t5+6EA5QNZSZAcLeFZS3iJLVeK/ORk8AVxHZ2o=; b=jcvCWnQqKNCYD2pfpfofVnqpWQEwxduNqQfjyFrVR1ocNUlcXE4JTwue zqNA7Wm0k6/vccf3CnevXtNfEL6XBk//yC6txqnQU7PVg8vPCvlYq5T3d XoVwYWklJvDKTpm+7lvLy1ciH4EL2TIHzkLc+2J8uDarcI2qquIX4l80C kPWyJ+k1JMAoJyz4pZDgHAyedAHtzoeJtQx7yk5i63zTPcpV9TseP3cMf zvl+ZnHtqpNLEAU0lRPRdeB+I5Rcm3umL3fpqczPWnB76zmp690/up7Ym W5oAd1OHPmwopH16tS+oBPXX8xpLSZnbhdR/WwA1oUYM2eiaWnfNw+Oti Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10615"; a="331298592" X-IronPort-AV: E=Sophos;i="5.97,281,1669104000"; d="scan'208";a="331298592" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2023 20:31:59 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10615"; a="669447438" X-IronPort-AV: E=Sophos;i="5.97,281,1669104000"; d="scan'208";a="669447438" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by fmsmga007.fm.intel.com with ESMTP; 08 Feb 2023 20:31:58 -0800 From: Yi Liu To: joro@8bytes.org, alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com, robin.murphy@arm.com Cc: cohuck@redhat.com, eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com, lulu@redhat.com, suravee.suthikulpanit@amd.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, baolu.lu@linux.intel.com Subject: [PATCH 01/17] iommu: Add new iommu op to create domains owned by userspace Date: Wed, 8 Feb 2023 20:31:37 -0800 Message-Id: <20230209043153.14964-2-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230209043153.14964-1-yi.l.liu@intel.com> References: <20230209043153.14964-1-yi.l.liu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Lu Baolu Introduce a new iommu_domain op to create domains owned by userspace, e.g. through iommufd. These domains have a few different properties compares to kernel owned domains: - They may be MANAGED domains, but created with special parameters. For instance aperture size changes/number of levels, different IOPTE formats, or other things necessary to make a vIOMMU work - We have to track all the memory allocations with GFP_KERNEL_ACCOUNT to make the cgroup sandbox stronger - Device-specialty domains, such as NESTED domains can be created by iommufd. The new op clearly says the domain is being created by IOMMUFD, that the domain is intended for userspace use, and it provides a way to pass a driver specific uAPI structure to customize the created domain to exactly what the vIOMMU userspace driver requires. iommu drivers that cannot support VFIO/IOMMUFD should not support this op. This includes any driver that cannot provide a fully functional UNMANAGED domain. This op chooses to make the special parameters opaque to the core. This suits the current usage model where accessing any of the IOMMU device special parameters does require a userspace driver that matches the kernel driver. If a need for common parameters, implemented similarly by several drivers, arises then there is room in the design to grow a generic parameter set as well. This new op for now is only supposed to be used by iommufd, hence no wrapper for it. iommufd would call the callback directly. As for domain free, iommufd would use iommu_domain_free(). Suggested-by: Jason Gunthorpe Signed-off-by: Lu Baolu Signed-off-by: Yi Liu --- include/linux/iommu.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 97b398d19fd2..214e3eb9bc86 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -230,6 +230,7 @@ struct iommu_iotlb_gather { * after use. Return the data buffer if success, or ERR_PTR on * failure. * @domain_alloc: allocate iommu domain + * @domain_alloc_user: allocate user iommu domain * @probe_device: Add device to iommu driver handling * @release_device: Remove device from iommu driver handling * @probe_finalize: Do final setup work after the device is added to an IOMMU @@ -262,6 +263,9 @@ struct iommu_ops { /* Domain allocation and freeing by the iommu driver */ struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); + struct iommu_domain *(*domain_alloc_user)(struct device *dev, + struct iommu_domain *parent, + const void *user_data); struct iommu_device *(*probe_device)(struct device *dev); void (*release_device)(struct device *dev);