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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9537FCC6B1D for ; Tue, 13 Oct 2026 15:24:39 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id AAA9F6B00BB; Tue, 13 Oct 2026 11:24:38 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A5AC56B00BE; Tue, 13 Oct 2026 11:24:38 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 923F16B00C0; Tue, 13 Oct 2026 11:24:38 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 6D5216B00BB for ; Tue, 13 Oct 2026 11:24:38 -0400 (EDT) Received: from smtpin10.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 1BB6180C9B for ; Tue, 13 Oct 2026 15:24:38 +0000 (UTC) X-FDA: 85317975036.10.1633EBC Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf26.hostedemail.com (Postfix) with ESMTP id 4B77B140007 for ; Tue, 13 Oct 2026 15:24:36 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=frqVEp7l; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf26.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1791905076; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=ts5FqIBv2fWYs7Xe01nn0l1b/khkxTyGv6WJ8ChJMkQ=; b=zgCptjb3PkVOdYMAFGULOwRKY1KR3h9gM5CPesQbfgpn5amyvOxMPTnbJ90jPmDT/8b22j NAu7//2/vWVv0D9gpeoMVbQ6ZWPDLKFUeJrBi3nliwZGeLOtupjix31d/lZcZHzaDO389f vxtzJRrHx8bZgrHpLWxrh6eCM7YhpUE= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=frqVEp7l; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf26.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1791905076; b=SJqTay11rcxY3XMOY3r6j4RWoV8smngIoFLzk9bw863bH/6uK6PVCF/ZePrNsBFofL15Im 4s22Fg9tRJNFLOK62/5Ec2ZRIFfTZF7xaxhkEEKpxMWhso0IM3eJ3mrLAh8J3Xp9/ZFItP KOyLYTgMF+NIPEZ5e7sPcI8OugksNMg= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 86CBF42D8C; Tue, 13 Oct 2026 15:24:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B0261F00893; Tue, 13 Oct 2026 15:24:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791905075; bh=ts5FqIBv2fWYs7Xe01nn0l1b/khkxTyGv6WJ8ChJMkQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=frqVEp7l8FM6W+8Dcyt6OaOlfy1/61o2FwoIu+tE+sCQS7ApPnpZVfcEjqwyG10pS 2yJ66rzsXeBSJ3aNehuTRuadNU36nKkye4Y95CxpodAE5FIEdBZE70Wnk0FHDNltXS oUg35rUjVOYIXcN+oSGaQJoGdIcu9/YirfjboOfM6Hqu3d8wHixBBrmHswsXrfvYHM 1VopEMJi1Orq35BbsmGYxyzh4z7Iao71qsAblpACMusbAylnHb/kkCDXAy0lQaLzSl deK8lvKWH5lGesNvD5IrDGaOnyec1OCF4+Hyri//uBAmksAXs9nKW1cjeR70iVdvar GEIN8zS57k93A== Message-ID: <2d301625-ba76-4b3f-8a24-d66f0e56bfef@kernel.org> Date: Tue, 13 Oct 2026 17:24:02 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 08/39] mm: add mmap action for discontiguous kernel page mapping To: "Lorenzo Stoakes (ARM)" , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonathan Corbet , Greg Kroah-Hartman , Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky , Paul Moore , Stephen Smalley , Jaroslav Kysela , Takashi Iwai , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Doug Gilbert , "James E.J. Bottomley" , "Martin K. 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Miller" , Andreas Larsson , Alexander Viro , Christian Brauner , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Youngjun Park , Johannes Weiner , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chengming Zhou , Michal Hocko , Miklos Szeredi , Xu Xin Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-usb@vger.kernel.org, linux-rdma@vger.kernel.org, selinux@vger.kernel.org, linux-sound@vger.kernel.org, bpf@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev, Ihor Solodrai , Bert Karwatzki References: <20261013-b4-mmap-prepare-vma-flag-sanify-v6-0-1aa3c9b139f9@kernel.org> <20261013-b4-mmap-prepare-vma-flag-sanify-v6-8-1aa3c9b139f9@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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Permit > this by providing discontig_kernel_page_ops which allows a driver to > specify how the operation should begin and how batches of pages should be > retrieved. > > It uses the minimum exposed interface to do so, providing address, page > offset and both vm_private_data state and a local private state object. > > ops->init can establish state for the operation, and ops->get outputs the > pages to map and their count. Should an error arise the core unmaps the > VMA, invoking vm_ops->close, which is therefore where any state established > by ops->init is released. > > Also update the compatibility layer to do this too via > compat_mmap_action_abort(). > > Batches may not exceed the VMA, but may map less than its full range in > case the driver wishes to allow the user to map an area larger than the > available data. > > To use it, users invoke mmap_action_map_discontig_kernel_pages() with > initial local private state and a set of operations. > > Users can then use one of the provided helper functions to perform an > action: > > * discontig_kernel_map_abort() - Abort and leave the mapping as it has > been accumulated so far. > * discontig_kernel_map_page() - Map a single page, or a compound page given > its head page, as 1..N contiguous pages. > * discontig_kernel_map_pages() - Map a struct page ** array of a specified > count, mapping only those pages which fit in the VMA. > > The userland VMA tests are updated accordingly. > > Acked-by: Zi Yan > Signed-off-by: Lorenzo Stoakes (ARM) > --- [...] > + > +int map_discontig_kernel_pages_complete(struct vm_area_struct *vma, > + struct mmap_action *action) ... indentation ;) Acked-by: David Hildenbrand (Arm) -- Cheers, David