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| author | Halil Pasic <pasic@linux.vnet.ibm.com> | 2016-02-25 13:26:32 +0100 |
|---|---|---|
| committer | Cornelia Huck <cornelia.huck@de.ibm.com> | 2016-04-20 14:27:32 +0200 |
| commit | dad7eefbd048a2f44c990303751159671e988d13 (patch) | |
| tree | 0fbed42ac72d73caec501b1c5f81d3a0b6e434cc | |
| parent | 4f1298584eb60fc7172851f75e10f7d6c33a2628 (diff) | |
| download | linux-dad7eefbd048a2f44c990303751159671e988d13.tar.bz2 | |
KVM: s390: document FLIC behavior on unsupported
FLIC behavior deviates from the API documentation in reporting EINVAL
instead of ENXIO for KVM_SET_DEVICE_ATTR/KVM_GET_DEVICE_ATTR when the group
or attribute is unknown/unsupported. Unfortunately this can not be fixed
for historical reasons. Let us at least have it documented.
Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
| -rw-r--r-- | Documentation/virtual/kvm/devices/s390_flic.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/s390_flic.txt b/Documentation/virtual/kvm/devices/s390_flic.txt index e3e314cb83e8..646f47470f98 100644 --- a/Documentation/virtual/kvm/devices/s390_flic.txt +++ b/Documentation/virtual/kvm/devices/s390_flic.txt @@ -94,3 +94,9 @@ struct kvm_s390_io_adapter_req { KVM_S390_IO_ADAPTER_UNMAP release a userspace page for the translated address specified in addr from the list of mappings + +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 +that a FLIC operation is unavailable based on the error code resulting from a +usage attempt. |