linux

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Jason Gunthorpe 5d8ddc819c vfio: Use get_user_pages_longterm correctly

commit bb94b55af3 upstream.

The patch noted in the fixes below converted get_user_pages_fast() to
get_user_pages_longterm(), however the two calls differ in a few ways.

First _fast() is documented to not require the mmap_sem, while _longterm()
is documented to need it. Hold the mmap sem as required.

Second, _fast accepts an 'int write' while _longterm uses 'unsigned int
gup_flags', so the expression '!!(prot & IOMMU_WRITE)' is only working by
luck as FOLL_WRITE is currently == 0x1. Use the expected FOLL_WRITE
constant instead.

Fixes: 94db151dc8 ("vfio: disable filesystem-dax page pinning")
Cc: <stable@vger.kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-07-11 16:29:15 +02:00

mdev

vfio/mdev: Use a module softdep for vfio_mdev

2017-02-08 13:13:25 -07:00

pci

vfio/pci: Virtualize Maximum Read Request Size

2018-04-24 09:36:34 +02:00

platform

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

Kconfig

vfio: Fix build break when SPAPR_TCE_IOMMU=n