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Fei Li authored
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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