From patchwork Wed Jun 5 10:44:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michal Privoznik X-Patchwork-Id: 13686601 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 EDF60C41513 for ; Wed, 5 Jun 2024 10:46:36 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sEo8n-0008MZ-VD; Wed, 05 Jun 2024 06:45:13 -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 1sEo8m-0008M5-Sp for qemu-devel@nongnu.org; Wed, 05 Jun 2024 06:45:12 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sEo8l-0007Xn-7y for qemu-devel@nongnu.org; Wed, 05 Jun 2024 06:45:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1717584309; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4D/kenT1/13dMTLp2DYmnMq53lBRYp23R5RDb0lM/OY=; b=L25VLTqL7YO5wFd4z1sMX9Bm1ddGtphxQmiJA9ZdZQqEJHseHjC66g0FlkWCy2Yk3L86p3 190Fxg0iTwNZTMgSSp4o+tNoPTeEJdRrNZaPlIcR3tx/yvqeXgAXEfBUPvISqMjA8HcJne 3loMkYYgEvkAgFpuh7TC/mDihgyWtLM= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-145--WtqjVbqN7COuIzeyw8M7g-1; Wed, 05 Jun 2024 06:45:08 -0400 X-MC-Unique: -WtqjVbqN7COuIzeyw8M7g-1 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D5141195C269 for ; Wed, 5 Jun 2024 10:45:06 +0000 (UTC) Received: from maggie.brq.redhat.com (unknown [10.43.3.102]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 0226E19560A2 for ; Wed, 5 Jun 2024 10:45:05 +0000 (UTC) From: Michal Privoznik To: qemu-devel@nongnu.org Subject: [PATCH v4 4/5] backends/hostmem: Report error on qemu_madvise() failures Date: Wed, 5 Jun 2024 12:44:57 +0200 Message-ID: <891a67f48e71b70110a7066ec622260c2ff28fc9.1717584048.git.mprivozn@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.129.124; envelope-from=mprivozn@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 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, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no 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 If user sets .merge or .dump attributes qemu_madvise() is called with corresponding advice. But it is never checked for failure which may mislead users into thinking the attribute is set correctly. Report an appropriate error. Signed-off-by: Michal Privoznik Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: David Hildenbrand --- backends/hostmem.c | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) diff --git a/backends/hostmem.c b/backends/hostmem.c index eb9682b4a8..012a8c190f 100644 --- a/backends/hostmem.c +++ b/backends/hostmem.c @@ -178,8 +178,14 @@ static void host_memory_backend_set_merge(Object *obj, bool value, Error **errp) void *ptr = memory_region_get_ram_ptr(&backend->mr); uint64_t sz = memory_region_size(&backend->mr); - qemu_madvise(ptr, sz, - value ? QEMU_MADV_MERGEABLE : QEMU_MADV_UNMERGEABLE); + if (qemu_madvise(ptr, sz, + value ? QEMU_MADV_MERGEABLE : QEMU_MADV_UNMERGEABLE)) { + error_setg_errno(errp, errno, + "Couldn't change property 'merge' on '%s'", + object_get_typename(obj)); + return; + } + backend->merge = value; } } @@ -204,8 +210,14 @@ static void host_memory_backend_set_dump(Object *obj, bool value, Error **errp) void *ptr = memory_region_get_ram_ptr(&backend->mr); uint64_t sz = memory_region_size(&backend->mr); - qemu_madvise(ptr, sz, - value ? QEMU_MADV_DODUMP : QEMU_MADV_DONTDUMP); + if (qemu_madvise(ptr, sz, + value ? QEMU_MADV_DODUMP : QEMU_MADV_DONTDUMP)) { + error_setg_errno(errp, errno, + "Couldn't change property 'dump' on '%s'", + object_get_typename(obj)); + return; + } + backend->dump = value; } } @@ -337,11 +349,19 @@ host_memory_backend_memory_complete(UserCreatable *uc, Error **errp) ptr = memory_region_get_ram_ptr(&backend->mr); sz = memory_region_size(&backend->mr); - if (backend->merge) { - qemu_madvise(ptr, sz, QEMU_MADV_MERGEABLE); + if (backend->merge && + qemu_madvise(ptr, sz, QEMU_MADV_MERGEABLE)) { + error_setg_errno(errp, errno, + "Couldn't set property 'merge' on '%s'", + object_get_typename(OBJECT(uc))); + return; } - if (!backend->dump) { - qemu_madvise(ptr, sz, QEMU_MADV_DONTDUMP); + if (!backend->dump && + qemu_madvise(ptr, sz, QEMU_MADV_DONTDUMP)) { + error_setg_errno(errp, errno, + "Couldn't set property 'dump' on '%s'", + object_get_typename(OBJECT(uc))); + return; } #ifdef CONFIG_NUMA unsigned long lastbit = find_last_bit(backend->host_nodes, MAX_NODES);