Commit beb060ed authored by Eric Farman's avatar Eric Farman Committed by Heiko Carstens
Browse files

vfio/ccw: remove old IDA format restrictions 



By this point, all the pieces are in place to properly support
a 2K Format-2 IDAL, and to convert a guest Format-1 IDAL to
the 2K Format-2 variety. Let's remove the fence that prohibits
them, and allow a guest to submit them if desired.

Signed-off-by: default avatarEric Farman <farman@linux.ibm.com>
Reviewed-by: default avatarMatthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent b5a73e8e

Documentation/s390/vfio-ccw.rst

+2 −2
Original line number Diff line number Diff line
@@ -219,8 +219,8 @@ values may occur: 
  The operation was successful.



``-EOPNOTSUPP``

  The orb specified transport mode or an unidentified IDAW format, or the

  scsw specified a function other than the start function.

  The ORB specified transport mode or the

  SCSW specified a function other than the start function.



``-EIO``

  A request was issued while the device was not in a state ready to accept

drivers/s390/cio/vfio_ccw_cp.c

+0 −8
Original line number Diff line number Diff line
@@ -380,14 +380,6 @@ static int ccwchain_calc_length(u64 iova, struct channel_program *cp) 
	do {

		cnt++;



		/*

		 * As we don't want to fail direct addressing even if the

		 * orb specified one of the unsupported formats, we defer

		 * checking for IDAWs in unsupported formats to here.

		 */

		if ((!cp->orb.cmd.c64 || cp->orb.cmd.i2k) && ccw_is_idal(ccw))

			return -EOPNOTSUPP;



		/*

		 * We want to keep counting if the current CCW has the

		 * command-chaining flag enabled, or if it is a TIC CCW