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 CE874C432C3 for ; Fri, 15 Nov 2019 23:05:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B13A6206D6 for ; Fri, 15 Nov 2019 23:05:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727483AbfKOXFb (ORCPT ); Fri, 15 Nov 2019 18:05:31 -0500 Received: from mga03.intel.com ([134.134.136.65]:52452 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727239AbfKOXFJ (ORCPT ); Fri, 15 Nov 2019 18:05:09 -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="217240234" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga002.jf.intel.com with ESMTP; 15 Nov 2019 15:05:06 -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 09/10] iommu/vt-d: Avoid sending invalid page response Date: Fri, 15 Nov 2019 15:09:36 -0800 Message-Id: <1573859377-75924-10-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 Page responses should only be sent when last page in group (LPIG) or private data is present in the page request. This patch avoids sending invalid descriptors. Fixes: 5d308fc1ecf53 ("iommu/vt-d: Add 256-bit invalidation descriptor support") Signed-off-by: Jacob Pan --- drivers/iommu/intel-svm.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index a223ae93b269..189865501411 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -688,11 +688,10 @@ static irqreturn_t prq_event_thread(int irq, void *d) if (req->priv_data_present) memcpy(&resp.qw2, req->priv_data, sizeof(req->priv_data)); + resp.qw2 = 0; + resp.qw3 = 0; + qi_submit_sync(&resp, iommu); } - resp.qw2 = 0; - resp.qw3 = 0; - qi_submit_sync(&resp, iommu); - head = (head + sizeof(*req)) & PRQ_RING_MASK; } -- 2.7.4