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Dan Williams d5168ce354 vfio: disable filesystem-dax page pinning 
commit 94db151dc8 upstream.

Filesystem-DAX is incompatible with 'longterm' page pinning. Without
page cache indirection a DAX mapping maps filesystem blocks directly.
This means that the filesystem must not modify a file's block map while
any page in a mapping is pinned. In order to prevent the situation of
userspace holding of filesystem operations indefinitely, disallow
'longterm' Filesystem-DAX mappings.

RDMA has the same conflict and the plan there is to add a 'with lease'
mechanism to allow the kernel to notify userspace that the mapping is
being torn down for block-map maintenance. Perhaps something similar can
be put in place for vfio.

Note that xfs and ext4 still report:

   "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"

...at mount time, and resolving the dax-dma-vs-truncate problem is one
of the last hurdles to remove that designation.

Acked-by: Alex Williamson <alex.williamson@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: kvm@vger.kernel.org
Cc: <stable@vger.kernel.org>
Reported-by: Haozhong Zhang <haozhong.zhang@intel.com>
Tested-by: Haozhong Zhang <haozhong.zhang@intel.com>
Fixes: d475c6346a ("dax,ext2: replace XIP read and write with DAX I/O")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-08 22:41:06 -08:00
arch parisc: Fix ordering of cache and TLB flushes 2018-03-08 22:41:05 -08:00
block block: kyber: fix domain token leak during requeue 2018-03-08 22:41:05 -08:00
certs
crypto
Documentation
drivers vfio: disable filesystem-dax page pinning 2018-03-08 22:41:06 -08:00
firmware
fs btrfs: use proper endianness accessors for super_copy 2018-03-08 22:41:05 -08:00
include net_sched: get rid of rcu_barrier() in tcf_block_put_ext() 2018-03-03 10:24:39 +01:00
init
ipc
kernel timers: Forward timer base before migrating timers 2018-03-08 22:41:04 -08:00
lib
mm
net net: sched: fix use-after-free in tcf_block_put_ext 2018-03-03 10:24:39 +01:00
samples
scripts
security
sound ALSA: hda - Fix pincfg at resume on Lenovo T470 dock 2018-03-08 22:41:02 -08:00
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Makefile Linux 4.14.24 2018-03-03 10:24:39 +01:00
README

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.