From patchwork Thu Oct 15 21:18:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kurz X-Patchwork-Id: 271173 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=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 ADD48C433DF for ; Thu, 15 Oct 2020 21:20:37 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DD76920759 for ; Thu, 15 Oct 2020 21:20:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DD76920759 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kaod.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:56522 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kTAfp-0005PY-RS for qemu-devel@archiver.kernel.org; Thu, 15 Oct 2020 17:20:34 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45510) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kTAeD-0004Ov-EU for qemu-devel@nongnu.org; Thu, 15 Oct 2020 17:18:53 -0400 Received: from us-smtp-delivery-44.mimecast.com ([205.139.111.44]:43090) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kTAeB-0001DU-T2 for qemu-devel@nongnu.org; Thu, 15 Oct 2020 17:18:53 -0400 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-176-yuWT6LbRNjSTn2sZ8uS0VQ-1; Thu, 15 Oct 2020 17:18:49 -0400 X-MC-Unique: yuWT6LbRNjSTn2sZ8uS0VQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E4E678030B3; Thu, 15 Oct 2020 21:18:47 +0000 (UTC) Received: from bahia.lan (ovpn-112-78.ams2.redhat.com [10.36.112.78]) by smtp.corp.redhat.com (Postfix) with ESMTP id 35767610F3; Thu, 15 Oct 2020 21:18:47 +0000 (UTC) Subject: [PATCH v2 4/5] spapr: Make spapr_cpu_core_unrealize() idempotent From: Greg Kurz To: David Gibson Date: Thu, 15 Oct 2020 23:18:46 +0200 Message-ID: <160279672626.1808373.14142129300586424514.stgit@bahia.lan> In-Reply-To: <160279669833.1808373.9524145092720289601.stgit@bahia.lan> References: <160279669833.1808373.9524145092720289601.stgit@bahia.lan> User-Agent: StGit/0.21 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=groug@kaod.org X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kaod.org Received-SPF: softfail client-ip=205.139.111.44; envelope-from=groug@kaod.org; helo=us-smtp-delivery-44.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/15 17:18:44 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -11 X-Spam_score: -1.2 X-Spam_bar: - X-Spam_report: (-1.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" spapr_cpu_core_realize() has a rollback path which partially duplicates the code of spapr_cpu_core_unrealize(). Let's make spapr_cpu_core_unrealize() idempotent and call it instead. This requires to: - move the registration and unregistration of the reset handler around but it is harmless, - allocate the array of vCPUs with g_new0() to be able to filter out unused slots, - make sure to only unrealize vCPUs that have been already realized. Signed-off-by: Greg Kurz --- hw/ppc/spapr_cpu_core.c | 41 +++++++++++++++++++++-------------------- 1 file changed, 21 insertions(+), 20 deletions(-) diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c index 45eb2121876e..317fb9934f58 100644 --- a/hw/ppc/spapr_cpu_core.c +++ b/hw/ppc/spapr_cpu_core.c @@ -227,15 +227,26 @@ static void spapr_cpu_core_unrealize(DeviceState *dev) CPUCore *cc = CPU_CORE(dev); int i; - qemu_unregister_reset(spapr_cpu_core_reset_handler, sc); - for (i = 0; i < cc->nr_threads; i++) { - spapr_unrealize_vcpu(sc->threads[i], sc); + if (sc->threads[i]) { + /* + * Since this we can get here from the error path of + * spapr_cpu_core_realize(), make sure we only unrealize + * vCPUs that have already been realized. + */ + if (object_property_get_bool(OBJECT(sc->threads[i]), "realized", + &error_abort)) { + spapr_unrealize_vcpu(sc->threads[i], sc); + } + } } for (i = 0; i < cc->nr_threads; i++) { - spapr_delete_vcpu(sc->threads[i]); + if (sc->threads[i]) { + spapr_delete_vcpu(sc->threads[i]); + } } g_free(sc->threads); + qemu_unregister_reset(spapr_cpu_core_reset_handler, sc); } static bool spapr_realize_vcpu(PowerPCCPU *cpu, SpaprMachineState *spapr, @@ -322,32 +333,22 @@ static void spapr_cpu_core_realize(DeviceState *dev, Error **errp) return; } - sc->threads = g_new(PowerPCCPU *, cc->nr_threads); + qemu_register_reset(spapr_cpu_core_reset_handler, sc); + sc->threads = g_new0(PowerPCCPU *, cc->nr_threads); for (i = 0; i < cc->nr_threads; i++) { sc->threads[i] = spapr_create_vcpu(sc, i, errp); if (!sc->threads[i]) { - goto err; + spapr_cpu_core_unrealize(dev); + return; } } for (j = 0; j < cc->nr_threads; j++) { if (!spapr_realize_vcpu(sc->threads[j], spapr, sc, errp)) { - goto err_unrealize; + spapr_cpu_core_unrealize(dev); + return; } } - - qemu_register_reset(spapr_cpu_core_reset_handler, sc); - return; - -err_unrealize: - while (--j >= 0) { - spapr_unrealize_vcpu(sc->threads[j], sc); - } -err: - while (--i >= 0) { - spapr_delete_vcpu(sc->threads[i]); - } - g_free(sc->threads); } static Property spapr_cpu_core_properties[] = {