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  1. Bug #1932157
  2. Comment #3

Comment 3 for bug 1932157

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bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2021-09-13 08:57 EDT-------
Upstream commit:

commit 7119decf47d9867266459615be502e5d2cecedba
Author: Janis Schoetterl-Glausch <email address hidden>
Date: Tue Jun 29 10:55:30 2021 +0200

KVM: s390: Enable specification exception interpretation

When this feature is enabled the hardware is free to interpret
specification exceptions generated by the guest, instead of causing
program interruption interceptions.

This benefits (test) programs that generate a lot of specification
exceptions (roughly 4x increase in exceptions/sec).

Interceptions will occur as before if ICTL_PINT is set,
i.e. if guest debug is enabled.

There is no indication if this feature is available or not and the
hardware is free to interpret or not. So we can simply set this bit and
if the hardware ignores it we fall back to intercept 8 handling.

Signed-off-by: Janis Schoetterl-Glausch <email address hidden>
Link: https://<email address hidden>/
Reviewed-by: David Hildenbrand <email address hidden>
Reviewed-by: Christian Borntraeger <email address hidden>
Signed-off-by: Christian Borntraeger <email address hidden>