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155a4321c1
Currently, vfio-ccw copies the ORB from the io_region to the channel_program struct being built. It then adjusts various pieces of that ORB to the values needed to be used by the SSCH issued by vfio-ccw in the host. This includes setting the subchannel key to the default, presumably because Linux doesn't do anything with non-zero storage keys itself. But it seems wrong to convert every I/O to the default key if the guest itself requested a non-zero subchannel (access) key. Any channel program that sets a non-zero key would expect the same key returned in the SCSW of the IRB, not zero, so best to allow that to occur unimpeded. Signed-off-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.