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| author | Yi Min Zhao <zyimin@linux.vnet.ibm.com> | 2017-02-20 05:15:01 +0300 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2017-04-06 14:15:37 +0300 |
| commit | a8920950131b1394f9e99ff57a5cf5ceeb0cc25c (patch) | |
| tree | 1aa07375bfc5eaa1726c0c78f87858a9c75452b6 /Documentation/virtual | |
| parent | 519783935451764b397f2a712de5ea778ff77fdf (diff) | |
| download | linux-a8920950131b1394f9e99ff57a5cf5ceeb0cc25c.tar.xz | |
KVM: s390: introduce adapter interrupt inject function
Inject adapter interrupts on a specified adapter which allows to
retrieve the adapter flags, e.g. if the adapter is subject to AIS
facility or not. And add documentation for this interface.
For adapters subject to AIS, handle the airq injection suppression
for a given ISC according to the interruption mode:
- before injection, if NO-Interruptions Mode, just return 0 and
suppress, otherwise, allow the injection.
- after injection, if SINGLE-Interruption Mode, change it to
NO-Interruptions Mode to suppress the following interrupts.
Besides, add tracepoint for suppressed airq and AIS mode transitions.
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>
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/devices/s390_flic.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/s390_flic.txt b/Documentation/virtual/kvm/devices/s390_flic.txt index dfd42fd4abd5..c2518cea8ab4 100644 --- a/Documentation/virtual/kvm/devices/s390_flic.txt +++ b/Documentation/virtual/kvm/devices/s390_flic.txt @@ -15,6 +15,7 @@ FLIC provides support to - enable/disable for the guest transparent async page faults - register and modify adapter interrupt sources (KVM_DEV_FLIC_ADAPTER_*) - modify AIS (adapter-interruption-suppression) mode state (KVM_DEV_FLIC_AISM) +- inject adapter interrupts on a specified adapter (KVM_DEV_FLIC_AIRQ_INJECT) Groups: KVM_DEV_FLIC_ENQUEUE @@ -127,6 +128,14 @@ struct kvm_s390_ais_req { will be suppressed until the mode is set again to ALL-Interruptions or SINGLE-Interruption mode. + KVM_DEV_FLIC_AIRQ_INJECT + Inject adapter interrupts on a specified adapter. + attr->attr contains the unique id for the adapter, which allows for + adapter-specific checks and actions. + For adapters subject to AIS, handle the airq injection suppression for + an isc according to the adapter-interruption-suppression mode on condition + that the AIS capability is enabled. + Note: The KVM_SET_DEVICE_ATTR/KVM_GET_DEVICE_ATTR device ioctls executed on FLIC with an unknown group or attribute gives the error code EINVAL (instead of ENXIO, as specified in the API documentation). It is not possible to conclude |