[GIT PULL 0/1] KVM: s390: bugfix for kvm/master (4.2)

[Christian Borntraeger <borntraeger@de.ibm.com>]

Paolo,

The following changes since commit 0da029ed7ee5fdf49a2a0e14160c3e9999be9292:

  KVM: x86: rename quirk constants to KVM_X86_QUIRK_* (2015-07-23 08:24:42 +0200)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git  tags/kvm-s390-master-20150730

for you to fetch changes up to 586b7ccdb7143b6a9b975d2c6ad52b6ca5c162b9:

  KVM: s390: Fix hang VCPU hang/loop regression (2015-07-30 13:11:13 +0200)

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KVM: s390: bugfix for kvm/master (4.2)

Here is a bugfix for a regression that was introduced after 4.1
with the commit commit 785dbef407d8 ("KVM: s390: optimize round
trip time in request handling"). After lots of cpu hotplugs in the
guest (online/offline) sometimes a guest CPU did loop within host
KVM code. Reason was that PROG_REQUEST was set in the sie control
block, but no request was pending. This made commit 785dbef407d8
the suspect and changing that area to always reset PROG_REQUEST
did indeed fix the problem.

Special thanks to David Hildenbrand, who helped understanding the
exact sequence that led to the problem.

----------------------------------------------------------------
Christian Borntraeger (1):
      KVM: s390: Fix hang VCPU hang/loop regression

 arch/s390/kvm/kvm-s390.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)