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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 98A22C433FF for ; Wed, 31 Jul 2019 08:47:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 75EAA208C3 for ; Wed, 31 Jul 2019 08:47:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727620AbfGaIrJ (ORCPT ); Wed, 31 Jul 2019 04:47:09 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60542 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727464AbfGaIrG (ORCPT ); Wed, 31 Jul 2019 04:47:06 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 01C3C7FDE9; Wed, 31 Jul 2019 08:47:06 +0000 (UTC) Received: from hp-dl380pg8-01.lab.eng.pek2.redhat.com (hp-dl380pg8-01.lab.eng.pek2.redhat.com [10.73.8.10]) by smtp.corp.redhat.com (Postfix) with ESMTP id 40E1C600CC; Wed, 31 Jul 2019 08:47:02 +0000 (UTC) From: Jason Wang To: mst@redhat.com, jasowang@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, jgg@ziepe.ca Subject: [PATCH V2 1/9] vhost: don't set uaddr for invalid address Date: Wed, 31 Jul 2019 04:46:47 -0400 Message-Id: <20190731084655.7024-2-jasowang@redhat.com> In-Reply-To: <20190731084655.7024-1-jasowang@redhat.com> References: <20190731084655.7024-1-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Wed, 31 Jul 2019 08:47:06 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We should not setup uaddr for the invalid address, otherwise we may try to pin or prefetch mapping of wrong pages. Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual address") Signed-off-by: Jason Wang --- drivers/vhost/vhost.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 0536f8526359..488380a581dc 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2082,7 +2082,8 @@ static long vhost_vring_set_num_addr(struct vhost_dev *d, } #if VHOST_ARCH_CAN_ACCEL_UACCESS - vhost_setup_vq_uaddr(vq); + if (r == 0) + vhost_setup_vq_uaddr(vq); if (d->mm) mmu_notifier_register(&d->mmu_notifier, d->mm); -- 2.18.1