Hello Rob,

It is a user SVC that has been on our system for a long time and it is used by 
a number of applications. So unfortunately our best (short time) option is to 
secure the SVC.
I will contact you of list if that is ok about the sample code for a pc routine.

Kind regards,

Erik.

On Fri, 3 May 2024 12:12:03 +0000, Rob Scott <rsc...@rocketsoftware.com> wrote:

>Erik.
>
>>> In the current implementation of the SVC that would work fine, since it is 
>>> all doing the MVC's in key 0, but if I change that to MVCSK and MVCDK 
>>> instructions I might get the 0C4 abend.
>
>Whilst I applaud your desire to implement MVCDK/SK, I think the word "fine" is 
>doing some heavy lifting in the above. 😊
>Using MVC in key0 to read/write non-Key0 memory is obviously a risk to system 
>integrity.
>
>A couple of other minor observations :
>(o) Is this SVC part of new development? If so, perhaps consider using PC-cp 
>instead - I am some sample code that could help in this endevour if you are 
>interested.
>You will require a resource owning ASID to house the PC routine, but it can be 
>limited function in design.
>
>(o) I am not a CICS person, but I thought that normal transactions are 
>discouraged from issuing SVCs (happy to be corrected if not so).

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