From patchwork Wed Apr 26 14:54:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13224673 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 C4CE2C77B7C for ; Wed, 26 Apr 2023 14:54:44 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 355FF10E530; Wed, 26 Apr 2023 14:54:44 +0000 (UTC) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id 714C810E530; Wed, 26 Apr 2023 14:54:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1682520876; x=1714056876; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=we3Zabe+6AgPN8c/FPEQV6hmIff3h/EBF2BbVZP1HZQ=; b=O7vDQNbhUKyujEmrsuyKmfTlfAmgelud2flgcv/zAoXm1q/icHDXcKss 8EsMsCUy866Xxqz0J9rcmVo9Z+bfSrIz1+rIizPsbfXkqPnSwlSpywS16 fB302FqKQdXByDt/yMLVWaTztG2yW6CHHUZIFWPKC6Rskzp9FfABLnK1R 8gVkGYT2/XEB2U3coSkRNEnxKwM1dxuXUNRZZ8KulabOygrGzxxRTQPGB 0TOos/YR5NM0aP9V/EfhzdTp1qfywoHXD3ja8PXJ9ddcOeHXUPHNT3Qao io5LsXNGVIgpMzFKTH/VYmLZOQjbGwBjyqn0CUlRRcKEDbBQkYNouiD0X g==; X-IronPort-AV: E=McAfee;i="6600,9927,10692"; a="433410337" X-IronPort-AV: E=Sophos;i="5.99,228,1677571200"; d="scan'208";a="433410337" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Apr 2023 07:54:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10692"; a="758644040" X-IronPort-AV: E=Sophos;i="5.99,228,1677571200"; d="scan'208";a="758644040" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by fmsmga008.fm.intel.com with ESMTP; 26 Apr 2023 07:54:35 -0700 From: Yi Liu To: alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com Date: Wed, 26 Apr 2023 07:54:16 -0700 Message-Id: <20230426145419.450922-7-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230426145419.450922-1-yi.l.liu@intel.com> References: <20230426145419.450922-1-yi.l.liu@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v4 6/9] iommufd: Reserved -1 in the iommufd xarray X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mjrosato@linux.ibm.com, jasowang@redhat.com, xudong.hao@intel.com, zhenzhong.duan@intel.com, peterx@redhat.com, terrence.xu@intel.com, chao.p.peng@linux.intel.com, linux-s390@vger.kernel.org, yi.l.liu@intel.com, kvm@vger.kernel.org, lulu@redhat.com, yanting.jiang@intel.com, joro@8bytes.org, nicolinc@nvidia.com, yan.y.zhao@intel.com, intel-gfx@lists.freedesktop.org, eric.auger@redhat.com, intel-gvt-dev@lists.freedesktop.org, yi.y.sun@linux.intel.com, cohuck@redhat.com, shameerali.kolothum.thodi@huawei.com, suravee.suthikulpanit@amd.com, robin.murphy@arm.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" VFIO needs two reserved values. 0 is already reserved by initializing xarray with XA_FLAGS_ALLOC1. This reserves -1 by limiting the xa alloc range. Signed-off-by: Yi Liu --- drivers/iommu/iommufd/main.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index 3fbe636c3d8a..51b27c96c52f 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -28,6 +28,9 @@ struct iommufd_object_ops { static const struct iommufd_object_ops iommufd_object_ops[]; static struct miscdevice vfio_misc_dev; +/* -1 is reserved */ +#define iommufd_xa_limit_32b XA_LIMIT(0, (-2U)) + struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size, enum iommufd_object_type type) @@ -50,7 +53,7 @@ struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx, * before calling iommufd_object_finalize(). */ rc = xa_alloc(&ictx->objects, &obj->id, XA_ZERO_ENTRY, - xa_limit_32b, GFP_KERNEL_ACCOUNT); + iommufd_xa_limit_32b, GFP_KERNEL_ACCOUNT); if (rc) goto out_free; return obj;