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The hypervisor signals the OS via a Hypervisor Pipe Event external interrupt when data is available to be received from the pipe. Then the OS should call RTAS check-exception and provide the input Event Mask as defined for the ‘ibm,hvpipe-msg-events’. In response, check-exception will return an event log containing an Pipe Events message. This message contains the source ID for which this message is intended to and the pipe status such as whether the payload is pending in the hypervisor or pipe to source is closed. If there is any user space process waiting in the wait_queue for the payload from this source ID, wake up that process which can issue read() to obtain payload with ibm,receive-hvpipe-msg RTAS or close FD if the pipe to source is closed. The hypervisor has one pipe per partition for all sources and it will not deliver another hvpipe event message until the partition reads the payload for the previous hvpipe event. So if the source ID is not found in the source list, issue the dummy ibm,receive-hvpipe-msg RTAS so that pipe will not blocked. Register hvpipe event source interrupt based on entries from /proc/device-tree//event-sources/ibm,hvpipe-msg-events property. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Tested-by: Shashank MS <shashank.gowda@in.ibm.com> Reviewed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com> Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20250909084402.1488456-8-haren@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 reStructuredText 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.