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vfio-ccw: Introduce a new CRW region

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This region provides a mechanism to pass a Channel Report Word
that affect vfio-ccw devices, and needs to be passed to the guest
for its awareness and/or processing.

The base driver (see crw_collect_info()) provides space for two
CRWs, as a subchannel event may have two CRWs chained together
(one for the ssid, one for the subchannel).  As vfio-ccw will
deal with everything at the subchannel level, provide space
for a single CRW to be transferred in one shot.

Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200505122745.53208-7-farman@linux.ibm.com>
[CH: added padding to ccw_crw_region]
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Farhan Ali 2020-05-05 14:27:43 +02:00 • committed by Cornelia Huck
parent 4296151d23
commit d8cac29b1d
7 changed files with 118 additions and 0 deletions
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9
include/uapi/linux/vfio_ccw.h
View file

@ -44,4 +44,13 @@ struct ccw_schib_region {
__u8 schib_area[SCHIB_AREA_SIZE];
} __packed;
/*
* Used for returning a Channel Report Word to userspace.
* Note: this is controlled by a capability
*/
struct ccw_crw_region {
__u32 crw;
__u32 pad;
} __packed;
#endif