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=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 CA862C43467 for ; Thu, 8 Oct 2020 12:41:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 684162083B for ; Thu, 8 Oct 2020 12:41:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="i93YgqfP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730109AbgJHMlw (ORCPT ); Thu, 8 Oct 2020 08:41:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730088AbgJHMlv (ORCPT ); Thu, 8 Oct 2020 08:41:51 -0400 Received: from mail-pg1-x543.google.com (mail-pg1-x543.google.com [IPv6:2607:f8b0:4864:20::543]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A1EC5C0613D6 for ; Thu, 8 Oct 2020 05:41:51 -0700 (PDT) Received: by mail-pg1-x543.google.com with SMTP id g29so4208899pgl.2 for ; Thu, 08 Oct 2020 05:41:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=urluBRAZhemlAGNYR9JHz7//XtKVwD7KOsOnuK3XEvE=; b=i93YgqfP2Qs8dlAx7dyQ+W0IRG7pAxhJwW9+eRHcvMVYP3djMki+CGM6zO0EVJGk6K IbQzLSWJO3N1l0EX9JrKSfHEa7utNqIB47jME7UstUYw4VjXJ3eqfisu2Lv5k6vC2Rji RXYD2ZA+lWznWQWoRqSMqejEaxBGkz94802iEmzJd0MCBP2cDlv790XzP6x1cW1hFd/9 VynwcCRsd9uDLYGf7l4gaVrI2jMIq7IhzjCPA4DTCHUEEBJWY9srCgIimdgBAYkzeSSZ OrD77ImZWUgTRcr1HoKIi9uUAfbiDRf/QR54E/fTvbFXgKqiTQNN+jJNb/teyHBDz9PA L6Zg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=urluBRAZhemlAGNYR9JHz7//XtKVwD7KOsOnuK3XEvE=; b=SVOtJrxNrBwUTzDBJNYSAbOrcQAT2k1Aai0YdBHdl34TA3TkzyABhD9Noy9gpNOG0R Xe256F8498fY3L9fTF/MTmXIUTcsRAYh8+es1Q1kdNtn4B0v3FosfZKwK4ykmygPNfer QfX/0sRZ/QA5TqweSIkvvM4+i2PSCVqt83Bl1+nd5Ol4ylhejcXtC4qdZWxFBf0fhVPf 6QqLIpHS6RBE+2AIL90a8ebdIyofSQqxI46hd8mtecsjTCue90Gs//kvIX3YtDFRpjfA ZEQjenvpifPX7RpeGziQVkV4YTbQ/HRt+/EE7Hdm6n0i/lPEnsg0t5pRXJhN2FXDPumh LlVQ== X-Gm-Message-State: AOAM533e5empaLpI5seCLBCeX0HlNGhu0uMoE6d1v5Q8smfkNK9fHp8p Ih+tHjGpbit9Lo+8+EZ7DOSang== X-Google-Smtp-Source: ABdhPJxnQ64uysYsu/F9BjeJkE2gf+57wvTrXl8yFyGGP/X1izZlhvOyXG/ViriTgaaOJPI9vrc0XQ== X-Received: by 2002:a17:90a:6787:: with SMTP id o7mr8072496pjj.125.1602160910911; Thu, 08 Oct 2020 05:41:50 -0700 (PDT) Received: from ziepe.ca ([206.223.160.26]) by smtp.gmail.com with ESMTPSA id k11sm7411830pjs.18.2020.10.08.05.41.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Oct 2020 05:41:49 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kQVEx-001U2l-UT; Thu, 08 Oct 2020 09:41:47 -0300 Date: Thu, 8 Oct 2020 09:41:47 -0300 From: Jason Gunthorpe To: Dan Williams Cc: Daniel Vetter , DRI Development , LKML , KVM list , Linux MM , Linux ARM , linux-samsung-soc , "Linux-media@vger.kernel.org" , linux-s390 , Daniel Vetter , Kees Cook , Andrew Morton , John Hubbard , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Jan Kara , Bjorn Helgaas , Linux PCI Subject: Re: [PATCH 10/13] PCI: revoke mappings like devmem Message-ID: <20201008124147.GD5177@ziepe.ca> References: <20201007164426.1812530-1-daniel.vetter@ffwll.ch> <20201007164426.1812530-11-daniel.vetter@ffwll.ch> <20201007232448.GC5177@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 08, 2020 at 12:49:54AM -0700, Dan Williams wrote: > > This is what got me thinking maybe this needs to be a bit bigger > > generic infrastructure - eg enter this scheme from fops mmap and > > everything else is in mm/user_iomem.c > > It still requires every file that can map physical memory to have its > ->open fop do Common infrastructure would have to create a dummy struct file at mmap time with the global inode and attach that to the VMA. Jason