From patchwork Tue Mar 15 18:34:36 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 8591541 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 152F49F44D for ; Tue, 15 Mar 2016 18:41:21 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 76E7C20272 for ; Tue, 15 Mar 2016 18:41:20 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C17142026C for ; Tue, 15 Mar 2016 18:41:19 +0000 (UTC) Received: from localhost ([::1]:50646 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aftuB-0002Bi-47 for patchwork-qemu-devel@patchwork.kernel.org; Tue, 15 Mar 2016 14:41:19 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43718) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1afto9-0006ef-8l for qemu-devel@nongnu.org; Tue, 15 Mar 2016 14:35:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1afto8-0001qb-5V for qemu-devel@nongnu.org; Tue, 15 Mar 2016 14:35:05 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47617) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1afto7-0001q2-Vh for qemu-devel@nongnu.org; Tue, 15 Mar 2016 14:35:04 -0400 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id 9064580514; Tue, 15 Mar 2016 18:35:03 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-116-46.ams2.redhat.com [10.36.116.46]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2FIZ1eP009988 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 15 Mar 2016 14:35:02 -0400 Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 025003004FBD; Tue, 15 Mar 2016 19:34:57 +0100 (CET) From: Markus Armbruster To: qemu-devel@nongnu.org Date: Tue, 15 Mar 2016 19:34:36 +0100 Message-Id: <1458066895-20632-22-git-send-email-armbru@redhat.com> In-Reply-To: <1458066895-20632-1-git-send-email-armbru@redhat.com> References: <1458066895-20632-1-git-send-email-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: claudio.fontana@huawei.com, cam@cs.ualberta.ca, mlureau@redhat.com, david.marchand@6wind.com, pbonzini@redhat.com Subject: [Qemu-devel] [PATCH v3 21/40] ivshmem: Assert interrupts are set up once X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP An interrupt is set up when the interrupt's file descriptor is received. Each message applies to the next interrupt vector. Therefore, each vector cannot be set up more than once. ivshmem_add_kvm_msi_virq() half-heartedly tries not to rely on this by doing nothing then, but that's not going to recover from this error should it become possible in the future. watch_vector_notifier() doesn't even try. Simply assert what is the case, so we get alerted if we ever screw it up. Signed-off-by: Markus Armbruster Reviewed-by: Marc-André Lureau --- hw/misc/ivshmem.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index 65e3a76..61e21cd 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -349,7 +349,7 @@ static void watch_vector_notifier(IVShmemState *s, EventNotifier *n, { int eventfd = event_notifier_get_fd(n); - /* if MSI is supported we need multiple interrupts */ + assert(!s->msi_vectors[vector].pdev); s->msi_vectors[vector].pdev = PCI_DEVICE(s); qemu_set_fd_handler(eventfd, ivshmem_vector_notify, @@ -535,10 +535,7 @@ static int ivshmem_add_kvm_msi_virq(IVShmemState *s, int vector) int ret; IVSHMEM_DPRINTF("ivshmem_add_kvm_msi_virq vector:%d\n", vector); - - if (s->msi_vectors[vector].pdev != NULL) { - return 0; - } + assert(!s->msi_vectors[vector].pdev); ret = kvm_irqchip_add_msi_route(kvm_state, msg, pdev); if (ret < 0) {