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=-11.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 0A1F7C432BE for ; Tue, 10 Aug 2021 20:20:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD28660F41 for ; Tue, 10 Aug 2021 20:20:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233062AbhHJUUk (ORCPT ); Tue, 10 Aug 2021 16:20:40 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:41603 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232851AbhHJUUi (ORCPT ); Tue, 10 Aug 2021 16:20:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1628626815; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=gr9ydGicGYYIpIdPqhG9R+Yfix/AQszzOwnKSS/8chs=; b=QqbzQWmfoJWI/tFHZsoJArzdb1nN3ZAMyoctqwaLC1vUJEHlzcvon4RgGSBhw0YTv5tlL/ P9+lBUSQAc8R6FQsSjIsj568rDAjYUUM8bLTfUTR4BnceXDbubeRgsPuaDyIWN70m3LV1d PScyrFhTZSYjO4LrHsKnlO5DpkMbOUw= Received: from mail-qk1-f197.google.com (mail-qk1-f197.google.com [209.85.222.197]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-315-la4MyYNuPc2UrOlaBrwVyg-1; Tue, 10 Aug 2021 16:20:14 -0400 X-MC-Unique: la4MyYNuPc2UrOlaBrwVyg-1 Received: by mail-qk1-f197.google.com with SMTP id q11-20020a05620a05abb02903ca17a8eef8so14723266qkq.10 for ; Tue, 10 Aug 2021 13:20:14 -0700 (PDT) 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=gr9ydGicGYYIpIdPqhG9R+Yfix/AQszzOwnKSS/8chs=; b=dTlyYRKOkJu7guxw6lME4iA5t0l+GdFWaqwFZ4xCDfwo3AvlZGGmJBQJKRJcB35EW0 8BDDq1XCMv6viJ8TaAUBXhAMq2QX686mBh+aE0GQVVrRbH+5+9Z1EjSReVKqylG5EKq9 9M99PUDgBMZHPFi/IgjFJ/hiPR678p1LWMjLCRhUYSNPhp04LeAcTEekYxugw55Y6xT4 1cezsp+GpFWX7jPB151xT6xJx+lNpicr4A8L3dwRgQhP9a7Eaot9iU3Hx9RwZB+FkSqS eyvFUYTpbZTnUsMwK1GZ53Eoiw6S0lo/eElZaQysXrz3qncUeymzp46Y6fcI6ssFdAnn 4TnQ== X-Gm-Message-State: AOAM533VHoLGQex3EMyXYK2M8kLBN/8V7x1Ri9Ly50XxQgCLSSh3wqmI keyb7jbmWRqXg4FljS9rnWBIkGyDof8KH2+WaoLrtCvzqRqsTYy7j/YLoQkay8+Ji2MbDj9woIA t13EWR+kbtHhFI4NTQbXYeEN3 X-Received: by 2002:a37:a7d2:: with SMTP id q201mr30795009qke.158.1628626814048; Tue, 10 Aug 2021 13:20:14 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxD/SBX1bvWaqNT+p/rP4m0OLiPIsi3i5KBCXy2l6Fk5Kcju97nlz7lIXDz3fxmxzfZ8fQHSA== X-Received: by 2002:a37:a7d2:: with SMTP id q201mr30794980qke.158.1628626813765; Tue, 10 Aug 2021 13:20:13 -0700 (PDT) Received: from t490s (bras-base-toroon474qw-grc-92-76-70-75-133.dsl.bell.ca. [76.70.75.133]) by smtp.gmail.com with ESMTPSA id a18sm11026048qkg.62.2021.08.10.13.20.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Aug 2021 13:20:13 -0700 (PDT) Date: Tue, 10 Aug 2021 16:20:12 -0400 From: Peter Xu To: Alex Williamson Cc: Jason Gunthorpe , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: [PATCH 3/7] vfio/pci: Use vfio_device_unmap_mapping_range() Message-ID: References: <162818167535.1511194.6614962507750594786.stgit@omen> <162818325518.1511194.1243290800645603609.stgit@omen> <20210810135932.6825833b.alex.williamson@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210810135932.6825833b.alex.williamson@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 10, 2021 at 01:59:32PM -0600, Alex Williamson wrote: > On Tue, 10 Aug 2021 14:48:31 -0400 > Peter Xu wrote: > > > On Thu, Aug 05, 2021 at 11:07:35AM -0600, Alex Williamson wrote: > > > @@ -1690,7 +1554,7 @@ static int vfio_pci_mmap(struct vfio_device *core_vdev, struct vm_area_struct *v > > > > > > vma->vm_private_data = vdev; > > > vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); > > > - vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff; > > > + vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); > > > > This addition seems to be an accident. :) Thanks, > > Nope, Jason noted on a previous version that io_remap_pfn_range() is > essentially: > > remap_pfn_range(vma, addr, pfn, size, pgprot_decrypted(prot)); > > So since we switched to vmf_insert_pfn() I added this page protection > flag to the vma instead, then it gets removed later when we switch back > to io_remap_pfn_range(). Thanks, I see, I read it wrongly as pgprot_noncached() previously. Yes, it makes sense to do so. Thanks, -- Peter Xu