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Thomas Huth f6550976fe KVM: s390: vsie: Fix the initialization of the epoch extension (epdx) field 
commit 0dd4cdccda upstream.

We recently experienced some weird huge time jumps in nested guests when
rebooting them in certain cases. After adding some debug code to the epoch
handling in vsie.c (thanks to David Hildenbrand for the idea!), it was
obvious that the "epdx" field (the multi-epoch extension) did not get set
to 0xff in case the "epoch" field was negative.
Seems like the code misses to copy the value from the epdx field from
the guest to the shadow control block. By doing so, the weird time
jumps are gone in our scenarios.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=2140899
Fixes: 8fa1696ea7 ("KVM: s390: Multiple Epoch Facility support")
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Cc: stable@vger.kernel.org # 4.19+
Link: https://lore.kernel.org/r/20221123090833.292938-1-thuth@redhat.com
Message-Id: <20221123090833.292938-1-thuth@redhat.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-12-14 11:37:20 +01:00
..
diag.c KVM: s390: restore old debugfs names 2021-07-27 16:59:00 -04:00
gaccess.c KVM: s390: Function documentation fixes 2021-09-28 17:56:54 +02:00
gaccess.h KVM: s390: split kvm_s390_real_to_abs 2021-03-24 10:30:30 +01:00
guestdbg.c KVM: s390: Add memcg accounting to KVM allocations 2020-12-10 13:36:05 +01:00
intercept.c KVM: s390: pv: don't present the ecall interrupt twice 2022-08-17 14:22:48 +02:00
interrupt.c KVM: s390: Clarify SIGP orders versus STOP/RESTART 2022-01-20 09:13:14 +01:00
irq.h KVM: s390: Remove redundant license text 2017-12-06 09:18:42 +01:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
kvm-s390.c KVM: s390: pv: don't allow userspace to set the clock under PV 2022-11-16 09:58:17 +01:00
kvm-s390.h KVM: s390: pv: don't allow userspace to set the clock under PV 2022-11-16 09:58:17 +01:00
Makefile KVM: stats: Add fd-based API to read binary stats data 2021-06-24 11:47:57 -04:00
priv.c KVM: s390x: fix SCK locking 2022-07-12 16:35:02 +02:00
pv.c KVM: s390: pv: leak the topmost page table when destroy fails 2022-08-17 14:23:51 +02:00
sigp.c KVM: s390: pv: don't present the ecall interrupt twice 2022-08-17 14:22:48 +02:00
trace-s390.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vsie.c KVM: s390: vsie: Fix the initialization of the epoch extension (epdx) field 2022-12-14 11:37:20 +01:00