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8eeba194a3
linux/arch/s390/kvm
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Eric Farman 8eeba194a3 KVM: s390: Simplify SIGP Set Arch handling 
The Principles of Operations describe the various reasons that
each individual SIGP orders might be rejected, and the status
bit that are set for each condition.

For example, for the Set Architecture order, it states:

  "If it is not true that all other CPUs in the configu-
   ration are in the stopped or check-stop state, ...
   bit 54 (incorrect state) ... is set to one."

However, it also states:

  "... if the CZAM facility is installed, ...
   bit 55 (invalid parameter) ... is set to one."

Since the Configuration-z/Architecture-Architectural Mode (CZAM)
facility is unconditionally presented, there is no need to examine
each VCPU to determine if it is started/stopped. It can simply be
rejected outright with the Invalid Parameter bit.

Fixes: b697e435ae ("KVM: s390: Support Configuration z/Architecture Mode")
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Link: https://lore.kernel.org/r/20211008203112.1979843-2-farman@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2021-10-25 09:20:39 +02:00
..
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: avoid stalls when making pages secure 2021-10-25 09:20:39 +02:00
interrupt.c KVM: s390: preserve deliverable_mask in __airqs_kick_single_vcpu 2021-10-20 13:03:04 +02:00
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: clear kicked_mask before sleeping again 2021-10-20 13:03:04 +02:00
kvm-s390.h KVM: x86: Query vcpu->vcpu_idx directly and drop its accessor 2021-09-22 10:33:11 -04:00
Makefile KVM: stats: Add fd-based API to read binary stats data 2021-06-24 11:47:57 -04:00
priv.c s390/vfio-ap: r/w lock for PQAP interception handler function pointer 2021-08-24 12:14:05 -06:00
pv.c KVM: s390: pv: avoid stalls for kvm_s390_pv_init_vm 2021-10-25 09:20:39 +02:00
sigp.c KVM: s390: Simplify SIGP Set Arch handling 2021-10-25 09:20:39 +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: Enable specification exception interpretation 2021-08-27 18:35:20 +02:00