From patchwork Tue Jan 26 07:48:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?TWljaGFsIFByw612b3puw61r?= X-Patchwork-Id: 1431572 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=RiTJA9Br; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4DPzRs2nWvz9sSs for ; Tue, 26 Jan 2021 18:50:33 +1100 (AEDT) Received: from localhost ([::1]:40162 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l4J7P-0006Kg-By for incoming@patchwork.ozlabs.org; Tue, 26 Jan 2021 02:50:31 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:54876) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l4J5Y-0004Sv-1P for qemu-devel@nongnu.org; Tue, 26 Jan 2021 02:48:36 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:54862) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1l4J5W-0003cN-8h for qemu-devel@nongnu.org; Tue, 26 Jan 2021 02:48:35 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611647313; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=hWxOxOvBlLzowF6Ed6XuaVAx01HHiInDIwqo1JHD9D8=; b=RiTJA9BrBTPJFCXImPhslW//AN+oEUC2PVovlzow5vMix+WHRqrWQgoTII3pbGPnFmnTR1 g/OQYfqX6NBmBqbOvWKi8VvWdqx+/gdzIx6zvsEk8QgqFugQWPArZGgFRIhMJxdga7sANO byA82lCVVEacE3sZeNeqmsAdMc6FtaA= 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-416-FD7lngdhNvyTdn4sHLc52A-1; Tue, 26 Jan 2021 02:48:30 -0500 X-MC-Unique: FD7lngdhNvyTdn4sHLc52A-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A05D415727 for ; Tue, 26 Jan 2021 07:48:29 +0000 (UTC) Received: from localhost.localdomain (unknown [10.40.193.116]) by smtp.corp.redhat.com (Postfix) with ESMTP id E996B1A890; Tue, 26 Jan 2021 07:48:28 +0000 (UTC) From: Michal Privoznik To: qemu-devel@nongnu.org Subject: [PATCH RESEND] hostmem: Don't report pmem attribute if unsupported Date: Tue, 26 Jan 2021 08:48:25 +0100 Message-Id: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mprivozn@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=mprivozn@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.255, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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: ehabkost@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" When management applications (like Libvirt) want to check whether memory-backend-file.pmem is supported they can list object properties using 'qom-list-properties'. However, 'pmem' is declared always (and thus reported always) and only at runtime QEMU errors out if it was built without libpmem (and thus can not guarantee write persistence). This is suboptimal since we have ability to declare attributes at compile time. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1915216 Signed-off-by: Michal Privoznik Reviewed-by: Daniel Henrique Barboza Tested-by: Daniel Henrique Barboza Reviewed-by: Igor Mammedov --- This is just a resend of a patch I've sent earlier with Reviewed-by and Tested-by added: https://lists.nongnu.org/archive/html/qemu-devel/2021-01/msg04558.html backends/hostmem-file.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c index 40e1e5b3e3..7e30eb5985 100644 --- a/backends/hostmem-file.c +++ b/backends/hostmem-file.c @@ -123,6 +123,7 @@ static void file_memory_backend_set_align(Object *o, Visitor *v, fb->align = val; } +#ifdef CONFIG_LIBPMEM static bool file_memory_backend_get_pmem(Object *o, Error **errp) { return MEMORY_BACKEND_FILE(o)->is_pmem; @@ -139,17 +140,9 @@ static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp) return; } -#ifndef CONFIG_LIBPMEM - if (value) { - error_setg(errp, "Lack of libpmem support while setting the 'pmem=on'" - " of %s. We can't ensure data persistence.", - object_get_typename(o)); - return; - } -#endif - fb->is_pmem = value; } +#endif /* CONFIG_LIBPMEM */ static void file_backend_unparent(Object *obj) { @@ -180,8 +173,10 @@ file_backend_class_init(ObjectClass *oc, void *data) file_memory_backend_get_align, file_memory_backend_set_align, NULL, NULL); +#ifdef CONFIG_LIBPMEM object_class_property_add_bool(oc, "pmem", file_memory_backend_get_pmem, file_memory_backend_set_pmem); +#endif } static void file_backend_instance_finalize(Object *o)