US Patent 7,818,472 B2 (Oct 2010) describes this operation - with the really
boring name of Prefix CCW.
On 1/27/12 12:35 PM, "Alan Altmark" <alan_altm...@us.ibm.com> wrote:
> On Friday, 01/27/2012 at 05:06 EST, Rob van der Heij <rvdh...@gmail.com>
> wrote:
>> Either way, it might be helpful to get an I/O trace of the real I/O
>> and see whether there is a real explanation as well (the E7 is not my
>> ancient 3990 Reference - seems to be one of the new ESS ones)
>
> (Tantalizing tidbit: The True Name of Secret Opcode E7, though not its
> meaning, is mentioned in in the ESS 2105 S/390 Reference.)
>
> PTF UM32334 for APAR VM64417 ("guest I/O operations fails on E7 opcode")
> is on z/VM 5.3 RSU 0802.
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