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=-8.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 51B3FC432C0 for ; Wed, 20 Nov 2019 21:07:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 21AEE2088F for ; Wed, 20 Nov 2019 21:07:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="QhNJaMMY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726529AbfKTVHk (ORCPT ); Wed, 20 Nov 2019 16:07:40 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:31404 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725787AbfKTVHj (ORCPT ); Wed, 20 Nov 2019 16:07:39 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574284058; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8MFDaxa6RF7dmt3Rxp0QolGSZ/pxc+3gpIsDqUic5QU=; b=QhNJaMMYjTtac/j3l59FK0UsPQpwv/SDbq90GmWR1QDSmE3nFxGFgXbxovZUsyTv1HnYOu gYcKomcf6grG5VtxHRqVQjjsNC2U8KPw1t8mduv7JY2s7cpCJxCTuIHr+lB5aO/G0v6se9 lkFSIqdHAjCcd+X5Dr8hG2KpFYMAnvI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-130-584KKkRzOi6JzDXU_vgHcA-1; Wed, 20 Nov 2019 16:07:34 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C0F13DB20; Wed, 20 Nov 2019 21:07:32 +0000 (UTC) Received: from [10.36.116.37] (ovpn-116-37.ams2.redhat.com [10.36.116.37]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B9F035F761; Wed, 20 Nov 2019 21:07:29 +0000 (UTC) Subject: Re: [PATCH v3 7/8] iommu/vt-d: Avoid sending invalid page response To: Jacob Pan , iommu@lists.linux-foundation.org, LKML , Joerg Roedel , Lu Baolu , David Woodhouse Cc: "Tian, Kevin" , Raj Ashok , Yi Liu , "Mehta, Sohil" References: <1574186193-30457-1-git-send-email-jacob.jun.pan@linux.intel.com> <1574186193-30457-8-git-send-email-jacob.jun.pan@linux.intel.com> From: Auger Eric Message-ID: Date: Wed, 20 Nov 2019 22:07:27 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <1574186193-30457-8-git-send-email-jacob.jun.pan@linux.intel.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-MC-Unique: 584KKkRzOi6JzDXU_vgHcA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jacob, On 11/19/19 6:56 PM, Jacob Pan wrote: > 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. >=20 > Fixes: 5d308fc1ecf53 ("iommu/vt-d: Add 256-bit invalidation descriptor > support") > Signed-off-by: Jacob Pan > Acked-by: Lu Baolu R-b sent on v2 Reviewed-by: Eric Auger Eric > --- > drivers/iommu/intel-svm.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) >=20 > diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c > index 71b85b892c56..4eecc24412dc 100644 > --- a/drivers/iommu/intel-svm.c > +++ b/drivers/iommu/intel-svm.c > @@ -686,11 +686,10 @@ static irqreturn_t prq_event_thread(int irq, void *= d) > =09=09=09if (req->priv_data_present) > =09=09=09=09memcpy(&resp.qw2, req->priv_data, > =09=09=09=09 sizeof(req->priv_data)); > +=09=09=09resp.qw2 =3D 0; > +=09=09=09resp.qw3 =3D 0; > +=09=09=09qi_submit_sync(&resp, iommu); > =09=09} > -=09=09resp.qw2 =3D 0; > -=09=09resp.qw3 =3D 0; > -=09=09qi_submit_sync(&resp, iommu); > - > =09=09head =3D (head + sizeof(*req)) & PRQ_RING_MASK; > =09} > =20 >=20