From patchwork Wed Aug 23 15:34:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 13362777 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 17E3AEE4993 for ; Wed, 23 Aug 2023 15:35:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qYptA-0002eW-6g; Wed, 23 Aug 2023 11:35:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qYpsl-00022i-8j for qemu-devel@nongnu.org; Wed, 23 Aug 2023 11:34:55 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qYpsj-0008GF-Bx for qemu-devel@nongnu.org; Wed, 23 Aug 2023 11:34:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1692804892; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=d1oQ+Qnb6PlcyCnKVT0QTOqM0Fb1NeLs1SpKNWY24OU=; b=CTsqh/0FQl2+YO7rkUvYBHtkK/4w3HjeKGH4LfxKvs93Byfh5hyQpnsfLncdJL/9yZt+GF z9PyTrgmEZI7q+9NxV3So2kZQibTAMyVo882Z5usmPZmc44yuLuZXkP+viILOXHAIoHMQ/ v0cVBZ67AHYuFB1OCUFsRSAEmnMH7gg= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-8-tX_XBjv1MyiXgUak00_qJA-1; Wed, 23 Aug 2023 11:34:50 -0400 X-MC-Unique: tX_XBjv1MyiXgUak00_qJA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 3A1848D40A1; Wed, 23 Aug 2023 15:34:49 +0000 (UTC) Received: from t14s.fritz.box (unknown [10.39.193.128]) by smtp.corp.redhat.com (Postfix) with ESMTP id 783171121314; Wed, 23 Aug 2023 15:34:46 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Cc: qemu-ppc@nongnu.org, David Hildenbrand , Paolo Bonzini , Peter Xu , Igor Mammedov , Thiner Logoer , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , =?utf-8?q?Dani?= =?utf-8?q?el_P_=2E_Berrang=C3=A9?= , Stefan Hajnoczi , Elena Ufimtseva , Jagannathan Raman , "Michael S. Tsirkin" , Ani Sinha , Xiao Guangrong , Daniel Henrique Barboza , Greg Kurz , Eric Blake , Markus Armbruster , Eduardo Habkost Subject: [PATCH v3 11/11] machine: Improve error message when using default RAM backend id Date: Wed, 23 Aug 2023 17:34:11 +0200 Message-ID: <20230823153412.832081-12-david@redhat.com> In-Reply-To: <20230823153412.832081-1-david@redhat.com> References: <20230823153412.832081-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org For migration purposes, users might want to reuse the default RAM backend id, but specify a different memory backend. For example, to reuse "pc.ram" on q35, one has to set -machine q35,memory-backend=pc.ram Only then, can a memory backend with the id "pc.ram" be created manually. Let's improve the error message. Unfortuantely, we cannot use error_append_hint(), because the caller passes &error_fatal. Suggested-by: ThinerLogoer Signed-off-by: David Hildenbrand Tested-by: Mario Casquero Reviewed-by: Philippe Mathieu-Daudé --- hw/core/machine.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/core/machine.c b/hw/core/machine.c index f0d35c6401..dbcd124d45 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -1382,7 +1382,9 @@ void machine_run_board_init(MachineState *machine, const char *mem_path, Error * machine_class->default_ram_id)) { error_setg(errp, "object name '%s' is reserved for the default" " RAM backend, it can't be used for any other purposes." - " Change the object's 'id' to something else", + " Change the object's 'id' to something else or disable" + " automatic creation of the default RAM backend by setting" + " the 'memory-backend' machine property", machine_class->default_ram_id); return; }