From patchwork Mon Jul 16 08:38:06 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gibson X-Patchwork-Id: 944247 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=gibson.dropbear.id.au Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b="pEOo0Hcm"; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 41TcSh6gYwz9rvt for ; Mon, 16 Jul 2018 18:45:56 +1000 (AEST) Received: from localhost ([::1]:49811 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fez8k-0007Sb-KE for incoming@patchwork.ozlabs.org; Mon, 16 Jul 2018 04:45:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40038) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fez1S-0001ER-VN for qemu-devel@nongnu.org; Mon, 16 Jul 2018 04:38:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fez1Q-00051o-Io for qemu-devel@nongnu.org; Mon, 16 Jul 2018 04:38:22 -0400 Received: from ozlabs.org ([2401:3900:2:1::2]:54455) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fez1P-0004z2-NH; Mon, 16 Jul 2018 04:38:20 -0400 Received: by ozlabs.org (Postfix, from userid 1007) id 41TcHm74bfz9s7G; Mon, 16 Jul 2018 18:38:12 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1531730293; bh=TQ2cvpsSwY15FmUWKEB96w2QZt+euSPb7/+jAr0mfU4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pEOo0HcmPUcXkOS355RnorkbqmsE04aTP2I27vmp61OhPnwJRoojmYkhDYOBm2Plp ge+obF8+J+66aHrT7k8nfleaer4lDR3bdLhC6weYlhaIWOBVMGXbMwav1sQk5Fi9Hd D04l2h5bxiFZguawPmkbmlltbCfa0mVn2yBzsEUE= From: David Gibson To: peter.maydell@linaro.org Date: Mon, 16 Jul 2018 18:38:06 +1000 Message-Id: <20180716083809.17115-4-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180716083809.17115-1-david@gibson.dropbear.id.au> References: <20180716083809.17115-1-david@gibson.dropbear.id.au> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2401:3900:2:1::2 Subject: [Qemu-devel] [PULL 3/6] ppc/xics: fix ICP reset path X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Gibson , qemu-ppc@nongnu.org, groug@kaod.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Greg Kurz Recent cleanup in commit a028dd423ee6 dropped the ICPStateClass::reset handler. It is now up to child ICP classes to call the DeviceClass::reset handler of the parent class, thanks to device_class_set_parent_reset(). This is a better object programming pattern, but unfortunately it causes QEMU to crash during CPU hotplug: (qemu) device_add host-spapr-cpu-core,id=core1,core-id=1 Segmentation fault (core dumped) When the hotplug path tries to reset the ICP device, we end up calling: static void icp_kvm_reset(DeviceState *dev) { ICPStateClass *icpc = ICP_GET_CLASS(dev); icpc->parent_reset(dev); but icpc->parent_reset is NULL... This happens because icp_kvm_class_init() calls: device_class_set_parent_reset(dc, icp_kvm_reset, &icpc->parent_reset); but dc->reset, ie, DeviceClass::reset for the TYPE_ICP type, is itself NULL. This patch hence sets DeviceClass::reset for the TYPE_ICP type to point to icp_reset(). It then registers a reset handler that calls DeviceClass::reset. If the ICP subtype has configured its own reset handler with device_class_set_parent_reset(), this ensures it will be called first and it can then call ICPStateClass::parent_reset safely. This fixes the reset path for the TYPE_KVM_ICP type, which is the only subtype that defines its own reset function. Reported-by: Satheesh Rajendran Suggested-by: David Gibson Fixes: a028dd423ee6dfd091a8c63028240832bf10f671 Signed-off-by: Greg Kurz Signed-off-by: David Gibson --- hw/intc/xics.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/hw/intc/xics.c b/hw/intc/xics.c index b9f1a3c972..c90c893228 100644 --- a/hw/intc/xics.c +++ b/hw/intc/xics.c @@ -291,7 +291,7 @@ static const VMStateDescription vmstate_icp_server = { }, }; -static void icp_reset(void *dev) +static void icp_reset(DeviceState *dev) { ICPState *icp = ICP(dev); @@ -303,6 +303,13 @@ static void icp_reset(void *dev) qemu_set_irq(icp->output, 0); } +static void icp_reset_handler(void *dev) +{ + DeviceClass *dc = DEVICE_GET_CLASS(dev); + + dc->reset(dev); +} + static void icp_realize(DeviceState *dev, Error **errp) { ICPState *icp = ICP(dev); @@ -345,7 +352,7 @@ static void icp_realize(DeviceState *dev, Error **errp) return; } - qemu_register_reset(icp_reset, dev); + qemu_register_reset(icp_reset_handler, dev); vmstate_register(NULL, icp->cs->cpu_index, &vmstate_icp_server, icp); } @@ -354,7 +361,7 @@ static void icp_unrealize(DeviceState *dev, Error **errp) ICPState *icp = ICP(dev); vmstate_unregister(NULL, &vmstate_icp_server, icp); - qemu_unregister_reset(icp_reset, dev); + qemu_unregister_reset(icp_reset_handler, dev); } static void icp_class_init(ObjectClass *klass, void *data) @@ -363,6 +370,7 @@ static void icp_class_init(ObjectClass *klass, void *data) dc->realize = icp_realize; dc->unrealize = icp_unrealize; + dc->reset = icp_reset; } static const TypeInfo icp_info = {