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Per the POPs [1], when processing an interrupt the SCSW.CPA field of an IRB generally points to 8 bytes after the last CCW that was executed (there are exceptions, but this is the most common behavior). In the case of an error, this points us to the first un-executed CCW in the chain. But in the case of normal I/O, the address points beyond the end of the chain. While the guest generally only cares about this when possibly restarting a channel program after error recovery, we should convert the address even in the good scenario so that we provide a consistent, valid, response upon I/O completion. [1] Figure 16-6 in SA22-7832-11. The footnotes in that table also state that this is true even if the resulting address is invalid or protected, but moving to the end of the guest chain should not be a surprise. Signed-off-by: Eric Farman <farman@linux.ibm.com> Message-Id: <20190514234248.36203-2-farman@linux.ibm.com> Reviewed-by: Farhan Ali <alifm@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com> |
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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.