linux-kernel - [RFC PATCH 0/2] mm,drm/ttm: Always block GUP to TTM pages

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Date:   Sun, 21 Mar 2021 19:45:27 +0100
From:   Thomas Hellström (Intel) 
        <thomas_os@...pmail.org>
To:     dri-devel@...ts.freedesktop.org
Cc:     Thomas Hellström (Intel) 
        <thomas_os@...pmail.org>,
        Christian Koenig <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jason Gunthorpe <jgg@...dia.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/2] mm,drm/ttm: Always block GUP to TTM pages

get_user_pages() to TTM pages is uwanted since TTM assumes it owns
the pages exclusively and / or sets up page-table mappings to io memory.

The first patch make sures we stop fast gup to huge TTM pages using
a trick with pmd_devmap() and pud_devmap() without a backing
dev_pagemap.

The second patch makes sure we block normal gup by setting VM_PFNMAP

Cc: Christian Koenig <christian.koenig@....com>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jason Gunthorpe <jgg@...dia.com>
Cc: linux-mm@...ck.org
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Thomas Hellström (Intel) <thomas_os@...pmail.org>