VIO data sets are supported for EXCP and EXCPVR requests. When an EXCP or EXCPVR request is issued for a VIO data set, the system simulates all of the common channel commands. Both format-0 and format-1 CCW channel programs are supported for VIO data sets, but note that 64-bit IDAWs, MIDAWs, and zHPF channel programs are not supported for a VIO data set.

For EXCPVR requests, the addresses in the CCWs and IDAWs must be virtual addresses - they must not be converted to real addresses.