linux-kernel - Re: [PATCH 10/13] PCI: revoke mappings like devmem

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Message-ID: <20201008124147.GD5177@ziepe.ca>
Date:   Thu, 8 Oct 2020 09:41:47 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        KVM list <kvm@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        "Linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        John Hubbard <jhubbard@...dia.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jan Kara <jack@...e.cz>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 10/13] PCI: revoke mappings like devmem

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