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ibm,send-hvpipe-msg RTAS call is used to send data to the source (Ex: Hardware Management Console) over the hypervisor pipe. The maximum data length of 4048 bytes is supported with this RTAS call right now. The user space uses write() to send this payload which invokes this RTAS. Then the write returns the buffer length (including papr_hvpipe_hdr length) to the user space for success or RTAS failure error. ibm,send-hvpipe-msg call takes source ID as target and the buffer in the form of buffer list. The buffer list format consists of work area of size 4K to hold buffer list and number of 4K work areas depends on buffers is as follows: Length of Buffer List in bytes Address of 4K buffer 1 Length of 4K buffer 1 used ... Address of 4K buffer n Length of 4K buffer n used Only one buffer is used right now because of max payload size is 4048 bytes. writev() can be used in future when supported more than one buffer. 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/20250909084402.1488456-5-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.