From patchwork Thu Apr 23 08:38:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jan Beulich X-Patchwork-Id: 11505289 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 4701C913 for ; Thu, 23 Apr 2020 08:39:34 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 2D50B20781 for ; Thu, 23 Apr 2020 08:39:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2D50B20781 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jRXNf-0007j4-R8; Thu, 23 Apr 2020 08:38:47 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jRXNf-0007is-2X for xen-devel@lists.xenproject.org; Thu, 23 Apr 2020 08:38:47 +0000 X-Inumbo-ID: d89c5f9a-853d-11ea-9336-12813bfff9fa Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id d89c5f9a-853d-11ea-9336-12813bfff9fa; Thu, 23 Apr 2020 08:38:46 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id DF9E3AFC1; Thu, 23 Apr 2020 08:38:44 +0000 (UTC) Subject: [PATCH v2 4/6] x86/mem-paging: add minimal lock order enforcement to p2m_mem_paging_prep() From: Jan Beulich To: "xen-devel@lists.xenproject.org" References: Message-ID: <4af1f459-fe7a-cd61-43cb-fb3fa4f15c00@suse.com> Date: Thu, 23 Apr 2020 10:38:44 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , George Dunlap , Wei Liu , =?utf-8?q?R?= =?utf-8?q?oger_Pau_Monn=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" While full checking is impossible (as the lock is being acquired/ released down the call tree), perform at least a lock level check. Signed-off-by: Jan Beulich Reviewed-by: Roger Pau Monné --- a/xen/arch/x86/mm/p2m.c +++ b/xen/arch/x86/mm/p2m.c @@ -1813,6 +1813,7 @@ int p2m_mem_paging_prep(struct domain *d goto out; /* Get a free page */ ret = -ENOMEM; + page_alloc_mm_pre_lock(d); page = alloc_domheap_page(d, 0); if ( unlikely(page == NULL) ) goto out;