On Wed, 8 Jul 2015 17:09:54 -0400 michelbutz <[email protected]> wrote:

:>I know that a S0C4 reason 4 occurs anytime the storage key doesn't match the 
PSW key bits 8 - 11

PIC-4 if alter or fetch with fetch protection.

:> Would IVSK. R1,R2 and SPKA 0(R11) prevent this obviously one would have to 
be in supervisor state to this as they are both privilege inst to qualify that 
if the storage key is 0

I presume you mean SPKA 0(1)

But if you know the storage is in key zero, why bother with the IVSK?

And even more, why are you accessing the protected storage? What is your
business case?

--
Binyamin Dissen <[email protected]>
http://www.dissensoftware.com

Director, Dissen Software, Bar & Grill - Israel


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