From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932526AbcILCs6 (ORCPT ); Sun, 11 Sep 2016 22:48:58 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58324 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932255AbcILCsz (ORCPT ); Sun, 11 Sep 2016 22:48:55 -0400 From: Xunlei Pang To: Joerg Roedel Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Xunlei Pang Subject: [PATCH] iommu/vt-d: Fix the size calculation of pasid table Date: Mon, 12 Sep 2016 10:49:11 +0800 Message-Id: <1473648551-10025-1-git-send-email-xlpang@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Mon, 12 Sep 2016 02:48:55 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org According to the vt-d spec, the size of pasid (state) entry is 8B which equals 3 in power of 2, the number of pasid (state) entries is (ecap_pss + 1) in power of 2. Thus the right size of pasid (state) table in power of 2 should be ecap_pss(iommu->ecap) plus "1+3=4" other than 7. Signed-off-by: Xunlei Pang --- 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 8ebb353..cfa75c2 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -39,7 +39,7 @@ int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu) struct page *pages; int order; - order = ecap_pss(iommu->ecap) + 7 - PAGE_SHIFT; + order = ecap_pss(iommu->ecap) + 4 - PAGE_SHIFT; if (order < 0) order = 0; -- 1.8.3.1