On 8/28/25 4:08 PM, Haren Myneni wrote: > 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 <ha...@linux.ibm.com> > Reviewed-by: Mahesh Salgaonkar <mah...@linux.ibm.com> > Tested-by: Shashank MS <shashank.go...@in.ibm.com> > ---
Reviewed-by: Tyrel Datwyler <tyr...@linux.ibm.com>
