From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B53D4269CE6 for ; Thu, 4 Dec 2025 02:30:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764815423; cv=none; b=Jhu5acomyftCiXDLfB3XabXpCVoIVZfBE5b+bz9Gnd+hH80SdZpMQxl1TcZkXfcDkNwKAhXtvX1Of/VbezGGcq0mYV/tQ4JSIiDjGhBhFR1NEQIgBCeCCrblS4cwFhfAAo2GwuEXlHSR143xPK1X6mCr68UHhopYZvSB29aks1k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764815423; c=relaxed/simple; bh=Agz27ztHoG/19PjHWv8wSeN+fERK8HwMYb0K9v1jqJ0=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=YczBMT/fdYQlqnljt0Q+l6IyfHGBj++vVcNXXEIQNOLBcBdg1R+9kx5ol4VO1Su7wMSY8NJu4HtbN6uOj/8dgCIxD9NPOe9Hjjx9ilspOU9y2VAAIfgIHpDUtBJ1BKMS3DUTzF2JDkY+dkoFcax3U+e5fwbXUykKWdvGDQnZL1E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=SnxjH+Jl; arc=none smtp.client-ip=192.198.163.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="SnxjH+Jl" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1764815408; x=1796351408; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=Agz27ztHoG/19PjHWv8wSeN+fERK8HwMYb0K9v1jqJ0=; b=SnxjH+JlMdcBBmWI+aZTlSL+ej5BG+ssmfgOg1yvJONYRhIj5UfdVlh2 rcbLd3xGJNxgG/6BUZz9jEOS1TjamPLgFkRMKKooA9WWJ+dCIQFlXvEjk oMz2Q1WS8VWK6UQjKu60BXc+RGIeENmD2lpGUpCi7+JrdMH74TYOsgWBA HnGB3/SWfoRUIdJH3TCxQY4UpCm3XKOVp6Mwqub2a6IOgWa/Aj+3qzPPv zGlG+jFVqPyb6SBTsvWECZQd0oa1L3R9OQqjk7BOxoFA02pyvZupDDpgX SdeKYUXiIf0Ydc1b3C3ZBoLNb8owMNYfDX8JoFUYqIHIoGtHQAhuzIjwc A==; X-CSE-ConnectionGUID: gv0TF+mJRUOHFkXrMiLrSA== X-CSE-MsgGUID: kRjkNwsqRXKX04sGqExbuQ== X-IronPort-AV: E=McAfee;i="6800,10657,11631"; a="70678879" X-IronPort-AV: E=Sophos;i="6.20,247,1758610800"; d="scan'208";a="70678879" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Dec 2025 18:30:01 -0800 X-CSE-ConnectionGUID: 46i5EZ3nQS2MNMWQJAHqlA== X-CSE-MsgGUID: /5Jy4kPRRIq5cxtdDHcTPw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,247,1758610800"; d="scan'208";a="225528569" Received: from allen-sbox.sh.intel.com (HELO [10.239.159.30]) ([10.239.159.30]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Dec 2025 18:29:56 -0800 Message-ID: Date: Thu, 4 Dec 2025 10:25:26 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v2 11/32] iommu/pages: Add APIs to preserve/unpreserve/restore iommu pages To: Samiullah Khawaja , David Woodhouse , Joerg Roedel , Will Deacon , Pasha Tatashin , Jason Gunthorpe , iommu@lists.linux.dev Cc: Robin Murphy , Pratyush Yadav , Kevin Tian , Alex Williamson , linux-kernel@vger.kernel.org, Saeed Mahameed , Adithya Jayachandran , Parav Pandit , Leon Romanovsky , William Tu , Vipin Sharma , dmatlack@google.com, YiFei Zhu , Chris Li , praan@google.com References: <20251202230303.1017519-1-skhawaja@google.com> <20251202230303.1017519-12-skhawaja@google.com> Content-Language: en-US From: Baolu Lu In-Reply-To: <20251202230303.1017519-12-skhawaja@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 12/3/25 07:02, Samiullah Khawaja wrote: > +int iommu_preserve_pages(struct iommu_pages_list *list) > +{ > + struct ioptdesc *iopt; > + int count = 0; > + int ret; > + > + list_for_each_entry(iopt, &list->pages, iopt_freelist_elm) { > + ret = kho_preserve_folio(ioptdesc_folio(iopt)); > + if (ret) { > + iommu_unpreserve_pages(list, count); > + return ret; > + } > + > + ++count; > + } > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(iommu_preserve_pages); What is the purpose of "count"? Thanks, baolu