From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B56E8C2BA19 for ; Thu, 23 Apr 2020 08:37:21 +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 8D68B20781 for ; Thu, 23 Apr 2020 08:37:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8D68B20781 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 1jRXM6-0007Ur-Tj; Thu, 23 Apr 2020 08:37:10 +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 1jRXM5-0007Um-PW for xen-devel@lists.xenproject.org; Thu, 23 Apr 2020 08:37:09 +0000 X-Inumbo-ID: 9e667482-853d-11ea-9336-12813bfff9fa Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 9e667482-853d-11ea-9336-12813bfff9fa; Thu, 23 Apr 2020 08:37:09 +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 63DD3AFC1; Thu, 23 Apr 2020 08:37:07 +0000 (UTC) Subject: [PATCH v2 1/6] x86/mem-paging: fold p2m_mem_paging_prep()'s main if()-s From: Jan Beulich To: "xen-devel@lists.xenproject.org" References: Message-ID: Date: Thu, 23 Apr 2020 10:37:06 +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-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit 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?Roger_Pau_Monn=c3=a9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" The condition of the second can be true only if the condition of the first was met; the second half of the condition of the second then also is redundant with an earlier check. Combine them, drop a pointless local variable, and re-flow the affected gdprintk(). Signed-off-by: Jan Beulich --- a/xen/arch/x86/mm/p2m.c +++ b/xen/arch/x86/mm/p2m.c @@ -1808,6 +1808,8 @@ int p2m_mem_paging_prep(struct domain *d /* Allocate a page if the gfn does not have one yet */ if ( !mfn_valid(mfn) ) { + void *guest_map; + /* If the user did not provide a buffer, we disallow */ ret = -EINVAL; if ( unlikely(user_ptr == NULL) ) @@ -1819,22 +1821,16 @@ int p2m_mem_paging_prep(struct domain *d goto out; mfn = page_to_mfn(page); page_extant = 0; - } - - /* If we were given a buffer, now is the time to use it */ - if ( !page_extant && user_ptr ) - { - void *guest_map; - int rc; ASSERT( mfn_valid(mfn) ); guest_map = map_domain_page(mfn); - rc = copy_from_user(guest_map, user_ptr, PAGE_SIZE); + ret = copy_from_user(guest_map, user_ptr, PAGE_SIZE); unmap_domain_page(guest_map); - if ( rc ) + if ( ret ) { - gdprintk(XENLOG_ERR, "Failed to load paging-in gfn %lx domain %u " - "bytes left %d\n", gfn_l, d->domain_id, rc); + gdprintk(XENLOG_ERR, + "Failed to load paging-in gfn %lx Dom%d bytes left %d\n", + gfn_l, d->domain_id, ret); ret = -EFAULT; put_page(page); /* Don't leak pages */ goto out;