[kvm-unit-tests PATCH v2 0/2] s390x: firq: floating interrupt test

From: David Hildenbrand <david@redhat.com>
To: kvm@vger.kernel.org
Cc: Thomas Huth <thuth@redhat.com>,
	Janosch Frank <frankja@linux.ibm.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Claudio Imbrenda <imbrenda@linux.ibm.com>,
	Sebastian Mitterle <smitterl@redhat.com>,
	Halil Pasic <pasic@linux.ibm.com>,
	linux-s390@vger.kernel.org, David Hildenbrand <david@redhat.com>
Subject: [kvm-unit-tests PATCH v2 0/2] s390x: firq: floating interrupt test
Date: Thu,  2 Dec 2021 13:35:51 +0100	[thread overview]
Message-ID: <20211202123553.96412-1-david@redhat.com> (raw)

From patch #2:

"
We had a KVM BUG fixed by kernel commit a3e03bc1368c ("KVM: s390: index
kvm->arch.idle_mask by vcpu_idx"), whereby a floating interrupt might get
stuck forever because a CPU in the wait state would not get woken up.

The issue can be triggered when CPUs are created in a nonlinear fashion,
such that the CPU address ("core-id") and the KVM cpu id don't match.

So let's start with a floating interrupt test that will trigger a
floating interrupt (via SCLP) to be delivered to a CPU in the wait state.
"

v1 -> v2:
- Remove flag logic
- Extend comments
- Minor cleanups
- sclp_clear_busy() before printing to the SCLP console

David Hildenbrand (2):
  s390x: make smp_cpu_setup() return 0 on success
  s390x: firq: floating interrupt test

 lib/s390x/sclp.c    |  11 ++--
 lib/s390x/sclp.h    |   1 +
 lib/s390x/smp.c     |   1 +
 s390x/Makefile      |   1 +
 s390x/firq.c        | 122 ++++++++++++++++++++++++++++++++++++++++++++
 s390x/unittests.cfg |  10 ++++
 6 files changed, 143 insertions(+), 3 deletions(-)
 create mode 100644 s390x/firq.c

-- 
2.31.1