From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6D72C43215 for ; Fri, 15 Nov 2019 23:05:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ABD9F206D6 for ; Fri, 15 Nov 2019 23:05:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727295AbfKOXFL (ORCPT ); Fri, 15 Nov 2019 18:05:11 -0500 Received: from mga03.intel.com ([134.134.136.65]:52457 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727220AbfKOXFH (ORCPT ); Fri, 15 Nov 2019 18:05:07 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Nov 2019 15:05:06 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,309,1569308400"; d="scan'208";a="217240222" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga002.jf.intel.com with ESMTP; 15 Nov 2019 15:05:05 -0800 From: Jacob Pan To: iommu@lists.linux-foundation.org, LKML , Joerg Roedel , "Lu Baolu" , David Woodhouse Cc: "Tian, Kevin" , Raj Ashok , "Yi Liu" , Eric Auger , Jacob Pan Subject: [PATCH 06/10] iommu/vt-d: Fix off-by-one in PASID allocation Date: Fri, 15 Nov 2019 15:09:33 -0800 Message-Id: <1573859377-75924-7-git-send-email-jacob.jun.pan@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1573859377-75924-1-git-send-email-jacob.jun.pan@linux.intel.com> References: <1573859377-75924-1-git-send-email-jacob.jun.pan@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PASID allocator uses IDR which is exclusive for the end of the allocation range. There is no need to decrement pasid_max. Fixes: af39507305fb ("iommu/vt-d: Apply global PASID in SVA") Reported-by: Eric Auger Signed-off-by: Jacob Pan --- drivers/iommu/intel-svm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index 924a4de84be1..b5537f27592f 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -338,7 +338,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_ /* Do not use PASID 0 in caching mode (virtualised IOMMU) */ ret = intel_pasid_alloc_id(svm, !!cap_caching_mode(iommu->cap), - pasid_max - 1, GFP_KERNEL); + pasid_max, GFP_KERNEL); if (ret < 0) { kfree(svm); kfree(sdev); -- 2.7.4