From patchwork Wed Mar 25 09:44:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Igor Mammedov X-Patchwork-Id: 11457287 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C1DCB14B4 for ; Wed, 25 Mar 2020 09:47:48 +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 98B3120771 for ; Wed, 25 Mar 2020 09:47:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="PHGj4rYr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 98B3120771 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:32890 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jH2dX-000180-O2 for patchwork-qemu-devel@patchwork.kernel.org; Wed, 25 Mar 2020 05:47:47 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55144) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jH2aR-0005Xy-Og for qemu-devel@nongnu.org; Wed, 25 Mar 2020 05:44:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jH2aQ-0005KW-Mc for qemu-devel@nongnu.org; Wed, 25 Mar 2020 05:44:35 -0400 Received: from us-smtp-delivery-74.mimecast.com ([63.128.21.74]:44070) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jH2aQ-0005Js-JK for qemu-devel@nongnu.org; Wed, 25 Mar 2020 05:44:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585129474; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OiFZDJTFclqzjCTSx+nVDwgRLTlGoJoYljIc1b69wDQ=; b=PHGj4rYrbI0WPy63trY70+L7eHrIKQfPKXK2c7PZkXvnBACTJFbt9GfDl5D6rp42deKGOo rpyXkBQF2HdlzVLVIciwlncL62X7Z/vHwiJv0U8kNlkDQoG0ftqDdtg99n+hydVWO/RTNS q7KNi1q02cPdvleRoZhuUt4udl5MOTk= 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-414-TozugXaMP1qgjiZZCLzYxw-1; Wed, 25 Mar 2020 05:44:32 -0400 X-MC-Unique: TozugXaMP1qgjiZZCLzYxw-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5F236DB60 for ; Wed, 25 Mar 2020 09:44:31 +0000 (UTC) Received: from dell-r430-03.lab.eng.brq.redhat.com (dell-r430-03.lab.eng.brq.redhat.com [10.37.153.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 336568D576; Wed, 25 Mar 2020 09:44:29 +0000 (UTC) From: Igor Mammedov To: qemu-devel@nongnu.org Subject: [PATCH for-5.0 1/2] hostmem: set default prealloc_threads to valid value Date: Wed, 25 Mar 2020 05:44:22 -0400 Message-Id: <20200325094423.24293-2-imammedo@redhat.com> In-Reply-To: <20200325094423.24293-1-imammedo@redhat.com> References: <20200325094423.24293-1-imammedo@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 63.128.21.74 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: lvivier@redhat.com, pbonzini@redhat.com, thuth@redhat.com, ehabkost@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Commit 4ebc74dbbf removed default prealloc_threads initialization by mistake, and that makes QEMU crash with division on zero at numpages_per_thread = numpages / memset_num_threads; when QEMU is started with following backend -object memory-backend-ram,id=ram-node0,prealloc=yes,size=128M Return back initialization removed by 4ebc74dbbf to fix issue. Fixes: 4ebc74dbbf7ad50e4101629f3f5da5fdc1544051 Reported-by: Raphael Norwitz Signed-off-by: Igor Mammedov Reviewed-by: Laurent Vivier --- backends/hostmem.c | 1 + 1 file changed, 1 insertion(+) diff --git a/backends/hostmem.c b/backends/hostmem.c index a70867b255..327f9eebc3 100644 --- a/backends/hostmem.c +++ b/backends/hostmem.c @@ -280,6 +280,7 @@ static void host_memory_backend_init(Object *obj) /* TODO: convert access to globals to compat properties */ backend->merge = machine_mem_merge(machine); backend->dump = machine_dump_guest_core(machine); + backend->prealloc_threads = 1; } static void host_memory_backend_post_init(Object *obj)