https://bugs.kde.org/show_bug.cgi?id=310931

--- Comment #2 from Mark Wielaard <mjw@redhat.com> ---
How about the following? It works for me, but we might want to mask of some
more other bits maybe for other extensions valgrind doesn't support.

Index: VEX/priv/guest_s390_helpers.c
===================================================================
--- VEX/priv/guest_s390_helpers.c    (revision 2574)
+++ VEX/priv/guest_s390_helpers.c    (working copy)
@@ -310,6 +310,11 @@
                 "srl    %2,28\n"
                 : "=m" (hoststfle), "+d"(reg0), "=d"(cc) : : "cc", "memory");

+   /* None of the message-security assist (MSA) extensions are supported
+      under valgrind.  So clear bit 17. */
+   UChar *ptr = (UChar *) &hoststfle[0] + (17 >> 3);
+   *ptr &= ~(0x80 >> (17 & 7));
+
    /* Update guest register 0  with what STFLE set r0 to */
    guest_state->guest_r0 = reg0;

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