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vfio/ccw: remove old IDA format restrictions

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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: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Eric Farman 2021-02-19 20:41:49 +01:00 committed by Heiko Carstens
parent b5a73e8eb2
commit beb060ed20
2 changed files with 2 additions and 10 deletions
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4
Documentation/s390/vfio-ccw.rst
View file

@ -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

8
drivers/s390/cio/vfio_ccw_cp.c
View file

@ -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