On 11/03/2017 09:14 AM, Harald Freudenberger wrote:
> I talked with the firmware guys about this.
> The answer is that the AP 3 instructions (NQAP, DQAP, PQAP) are always 
> available.

That is true for basic mode and LPAR, but certainly not for z/VM or KVM guests.


> Tony is right with the facility bits.
> facility bit 15 tells if the T bit is supported with the PQAP(TAPQ) 
> subcommand,
> facility bit 12 tells if the PQAP(QCI) subcommand is available.
> 
> As far as I could discover the AP instructions where optional on some older 
> machines.
> This may be the reason why zVM throws an exception if there is no AP device 
> assigned.
> However, for all machines still in service the AP instructions are available 
> at al time.

We have to distinguish LPARs and 2nd level guests under KVM/z/VM. For those 2nd 
level
guests there are configurations out there TODAY that do not support PQAP and 
friends.

Reply via email to