KVM: s390: introduce ais mode modify function
Provide an interface for userspace to modify AIS (adapter-interruption-suppression) mode state, and add documentation for the interface. Allowed target modes are ALL-Interruptions mode and SINGLE-Interruption mode. We introduce the 'simm' and 'nimm' fields in kvm_s390_float_interrupt to store interruption modes for each ISC. Each bit in 'simm' and 'nimm' targets to one ISC, and collaboratively indicate three modes: ALL-Interruptions, SINGLE-Interruption and NO-Interruptions. This interface can initiate most transitions between the states; transition from SINGLE-Interruption to NO-Interruptions via adapter interrupt injection will be introduced in a following patch. The meaningful combinations are as follows: interruption mode | simm bit | nimm bit ------------------|----------|---------- ALL | 0 | 0 SINGLE | 1 | 0 NO | 1 | 1 Besides, add tracepoint to track AIS mode transitions. Co-Authored-By: Yi Min Zhao <zyimin@linux.vnet.ibm.com> Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com> Signed-off-by: Fei Li <sherrylf@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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committed by
Christian Borntraeger

parent
08fab50da6
commit
5197839354
@@ -1515,6 +1515,10 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
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kvm_s390_crypto_init(kvm);
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mutex_init(&kvm->arch.float_int.ais_lock);
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kvm->arch.float_int.simm = 0;
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kvm->arch.float_int.nimm = 0;
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kvm->arch.float_int.ais_enabled = 0;
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spin_lock_init(&kvm->arch.float_int.lock);
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for (i = 0; i < FIRQ_LIST_COUNT; i++)
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INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
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