From patchwork Mon Jun 19 17:14:39 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Williamson X-Patchwork-Id: 9797003 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 67A46603F5 for ; Mon, 19 Jun 2017 17:15:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4694727F92 for ; Mon, 19 Jun 2017 17:15:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3B20C2833C; Mon, 19 Jun 2017 17:15:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AD62027F92 for ; Mon, 19 Jun 2017 17:15:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751324AbdFSROs (ORCPT ); Mon, 19 Jun 2017 13:14:48 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57498 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750913AbdFSROq (ORCPT ); Mon, 19 Jun 2017 13:14:46 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 39808C007ACA; Mon, 19 Jun 2017 17:14:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 39808C007ACA Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=alex.williamson@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 39808C007ACA Received: from gimli.home (ovpn-116-67.phx2.redhat.com [10.3.116.67]) by smtp.corp.redhat.com (Postfix) with ESMTP id 259EC7C77E; Mon, 19 Jun 2017 17:14:40 +0000 (UTC) Subject: [PATCH v2 2/9] kvm-vfio: Decouple only when we match a group From: Alex Williamson To: kvm@vger.kernel.org Cc: Alexey Kardashevskiy , linux-kernel@vger.kernel.org, stable@vger.kernel.org, eric.auger@redhat.com, alex.williamson@redhat.com, Paolo Bonzini Date: Mon, 19 Jun 2017 11:14:39 -0600 Message-ID: <20170619171439.14047.33875.stgit@gimli.home> In-Reply-To: <20170619170323.14047.26504.stgit@gimli.home> References: <20170619170323.14047.26504.stgit@gimli.home> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Mon, 19 Jun 2017 17:14:41 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Unset-KVM and decrement-assignment only when we find the group in our list. Otherwise we can get out of sync if the user triggers this for groups that aren't currently on our list. Signed-off-by: Alex Williamson Cc: Paolo Bonzini Cc: Eric Auger Cc: Alexey Kardashevskiy Cc: stable@vger.kernel.org Reviewed-by: Alexey Kardashevskiy --- virt/kvm/vfio.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c index 37d9118fd84b..f1b0b7bca9a9 100644 --- a/virt/kvm/vfio.c +++ b/virt/kvm/vfio.c @@ -246,21 +246,19 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg) continue; list_del(&kvg->node); + kvm_arch_end_assignment(dev->kvm); +#ifdef CONFIG_SPAPR_TCE_IOMMU + kvm_spapr_tce_release_vfio_group(dev->kvm, vfio_group); +#endif + kvm_vfio_group_set_kvm(kvg->vfio_group, NULL); kvm_vfio_group_put_external_user(kvg->vfio_group); kfree(kvg); ret = 0; break; } - kvm_arch_end_assignment(dev->kvm); - mutex_unlock(&kv->lock); -#ifdef CONFIG_SPAPR_TCE_IOMMU - kvm_spapr_tce_release_vfio_group(dev->kvm, vfio_group); -#endif - kvm_vfio_group_set_kvm(vfio_group, NULL); - kvm_vfio_group_put_external_user(vfio_group); kvm_vfio_update_coherency(dev);