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]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87BC4C433F5 for ; Wed, 2 Feb 2022 14:04:28 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 0F1798D0101; Wed, 2 Feb 2022 09:04:28 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0A0D08D00FA; Wed, 2 Feb 2022 09:04:28 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EAAB18D0101; Wed, 2 Feb 2022 09:04:27 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0095.hostedemail.com [216.40.44.95]) by kanga.kvack.org (Postfix) with ESMTP id DD6018D00FA for ; Wed, 2 Feb 2022 09:04:27 -0500 (EST) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id A1F4D8F84F for ; Wed, 2 Feb 2022 14:04:27 +0000 (UTC) X-FDA: 79098009774.19.AA47E1C Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf15.hostedemail.com (Postfix) with ESMTP id 559F4A000D for ; Wed, 2 Feb 2022 14:04:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=kBjoQP6Uo0tPLosDtcT2XD2WLyNHA0G/D9g0cgaEJ1s=; b=qNrg5H1tXfWMIelRnu2c5IChMR SxvYzy2q1Qz/V/D+1qgvX4VYVALTKEa4QCT8dJHlH/codrG1FAGGdbcRZHQ/Z8l5QUt8lgVgnAUO/ VQ1wS6B+RO+uMUvnBQLumW86x4+TRQ56B9bhcaDiDnQQEZozriePY+mt3LG7/sFEzdWt4y41Z+f5S gyrBw+GCA6Un0Z70N7HdEA5sACSh6NvcsW+CQ8gyLZ4u+wbKz+luSGxP27ANbUMrYXGws4KdKdaqd WOdBX5g/Isz6KQJhk8S90Z7SdeqIWNwNDTEOajzHe1D5ble409oUMkBPd6vqTtBHoFV/Kl3r4jQQN SXt9saFA==; Received: from hch by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nFGF8-00FWUe-0f; Wed, 02 Feb 2022 14:04:18 +0000 Date: Wed, 2 Feb 2022 06:04:17 -0800 From: Christoph Hellwig To: John Hubbard Cc: Andrew Morton , Peter Xu , Jason Gunthorpe , Jan Kara , Claudio Imbrenda , "Kirill A . Shutemov" , Alex Williamson , Andrea Arcangeli , =?iso-8859-1?B?Suly9G1l?= Glisse , LKML , linux-mm@kvack.org Subject: Re: [PATCH 1/4] mm: Fix invalid page pointer returned with FOLL_PIN gups Message-ID: References: <20220131051752.447699-1-jhubbard@nvidia.com> <20220131051752.447699-2-jhubbard@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220131051752.447699-2-jhubbard@nvidia.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 559F4A000D X-Rspam-User: nil Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=qNrg5H1t; dmarc=none; spf=none (imf15.hostedemail.com: domain of BATV+b18bff4eac1ff4fd9b6a+6737+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+b18bff4eac1ff4fd9b6a+6737+infradead.org+hch@bombadil.srs.infradead.org X-Stat-Signature: 6kiaxajh7wmp1hbe83bqmbnj79w86mji X-HE-Tag: 1643810667-996417 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Jan 30, 2022 at 09:17:49PM -0800, John Hubbard wrote: > From: Peter Xu > > Alex reported invalid page pointer returned with pin_user_pages_remote() from > vfio after upstream commit 4b6c33b32296 ("vfio/type1: Prepare for batched > pinning with struct vfio_batch"). This problem breaks NVIDIA vfio mdev. I haven't actually seen any nvidia mdev module in the tree.