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 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 CEE30CA0EE0 for ; Wed, 13 Aug 2025 14:51:41 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1umCpC-0008BE-OT; Wed, 13 Aug 2025 10:51:34 -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 1umCon-0007sK-K2; Wed, 13 Aug 2025 10:51:12 -0400 Received: from mgamail.intel.com ([192.198.163.19]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1umCoi-0001AL-NC; Wed, 13 Aug 2025 10:51:08 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1755096665; x=1786632665; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=gvTBCTKZO2MqsAwy/vVLHs8YYKd5LMpW7mE5be4HA6M=; b=cu7bC9oc5A45YZvHhbkjynSoDwztcfGobGmWcXNzMrEDZJKLMvfGpbS+ GGyi8OzK6m7TrlhhAmlhOSZiz5CdF/pc70aDBlOT73xi3sIH7xJ4WMqkU o+sPapCy+zzYp8MRa4Ec02ZhrM0zwlvBkpMkbhLuQN1o7dSD8CHTxgSAH Dxkro0TlSEw1fc5AXamBZfXQ+e0EE79r4EXfj4KhuIVyhfsBP+JxVFmnz FPlq3lfOfMxHtCa4b4Lmlpr5me1f62flNHgkWUncfeUc9KcY4T56Exsv5 wLZM3r2daJU1ZTIJD/xXOCYSo5tg99/NfWEcT+omDy4K2u4M7MKIQeADb g==; X-CSE-ConnectionGUID: TzUMNncuQJKD89xPoBszjg== X-CSE-MsgGUID: qGBi/NcLQcONC3onV/wrUA== X-IronPort-AV: E=McAfee;i="6800,10657,11520"; a="56417912" X-IronPort-AV: E=Sophos;i="6.17,285,1747724400"; d="scan'208";a="56417912" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Aug 2025 07:51:00 -0700 X-CSE-ConnectionGUID: ZLLK08pcQg22lyNTe6Zhgw== X-CSE-MsgGUID: CpjqAvpJTOGKp+fRVfosSg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,285,1747724400"; d="scan'208";a="166858511" Received: from liuzhao-optiplex-7080.sh.intel.com (HELO localhost) ([10.239.160.39]) by fmviesa008.fm.intel.com with ESMTP; 13 Aug 2025 07:50:56 -0700 Date: Wed, 13 Aug 2025 23:12:38 +0800 From: Zhao Liu To: Manos Pitsidianakis Cc: Paolo Bonzini , Peter Xu , David Hildenbrand , Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= , Alex =?iso-8859-1?Q?Benn=E9e?= , Thomas Huth , Junjie Mao , "open list:ARM SMMU ," , qemu-rust@nongnu.org, Dapeng Mi , Chuanxiao Dong Subject: Re: [RFC 16/26] memory: Make flatview_do_translate() return a pointer to MemoryRegionSection Message-ID: References: <20250807123027.2910950-1-zhao1.liu@intel.com> <20250807123027.2910950-17-zhao1.liu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=192.198.163.19; envelope-from=zhao1.liu@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-rust@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: QEMU Rust-related patches and discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-rust-bounces+qemu-rust=archiver.kernel.org@nongnu.org Sender: qemu-rust-bounces+qemu-rust=archiver.kernel.org@nongnu.org > Yes, the usual approach is to have a Ref and a RefMut type e.g. Opaque and > OpaqueMut, and the OpaqueMut type can dereference immutably as an Opaque. > > See std::cell::{Ref, RefMut} for inspiration. > Thanks! I'll dorp Opaque directly for this case. If there're more similar cases, then we can have a OpaqueRef<>. Regards, Zhao