In <eqhp99hrteh41cg45872irb1a8ru18c...@4ax.com>, on 12/02/2013
at 07:47 PM, Binyamin Dissen <bdis...@dissensoftware.com> said:
>On Sun, 1 Dec 2013 18:04:18 -0500 "Shmuel Metz (Seymour J.)"
><shmuel+ibm-m...@patriot.net> wrote:
>:>In
>:><b6c1eb4364c30e47950e0f68ef65f467015...@proditmailbox1.us.syncsort.com>,
>:>on 11/30/2013
>:> at 09:53 PM, "Blaicher, Christopher Y." <cblaic...@syncsort.com>
>:>said:
>:>
>:>>- Don't ever read data from a caller's address space when you are
>:>.not in the caller's key.
>:>MVCK
>MVCSK
MVCOS
>:>>- Don't EVER, EVER write data to a caller's address space when
>:>>you are not in the caller's key.
>:>MVCK
>MVCDK
MVCOS
The point being that there are half a dozen specialized instructions
that do the necessary key checking without any need to be in the
callers key; the particular instructions that are appropriate depend,
e.g., on the environment. MVCK was just a particular counterexample,
appropriate for some cases but not for others.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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