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| author | Fei Li <sherrylf@linux.vnet.ibm.com> | 2017-01-19 17:02:26 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2017-04-06 13:15:36 +0200 |
| commit | 08fab50da669e5ee5a542592895fcb63be3cd7b1 (patch) | |
| tree | 5a5a6da1eabfa35708d2f96e4c510f2433374052 /Documentation/virtual/kvm | |
| parent | 4e0b1ab72b8af961bcaca9ec1475279c1cd9579c (diff) | |
| download | linux-stable-08fab50da669e5ee5a542592895fcb63be3cd7b1.tar.gz linux-stable-08fab50da669e5ee5a542592895fcb63be3cd7b1.tar.bz2 linux-stable-08fab50da669e5ee5a542592895fcb63be3cd7b1.zip | |
KVM: s390: interface for suppressible I/O adapters
In order to properly implement adapter-interruption suppression, we
need a way for userspace to specify which adapters are subject to
suppression. Let's convert the existing (and unused) 'pad' field into
a 'flags' field and define a flag value for suppressible adapters.
Besides, add documentation for the interface.
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/kvm')
| -rw-r--r-- | Documentation/virtual/kvm/devices/s390_flic.txt | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/Documentation/virtual/kvm/devices/s390_flic.txt b/Documentation/virtual/kvm/devices/s390_flic.txt index 6b0e115301c8..e8ee3b6edb05 100644 --- a/Documentation/virtual/kvm/devices/s390_flic.txt +++ b/Documentation/virtual/kvm/devices/s390_flic.txt @@ -64,12 +64,18 @@ struct kvm_s390_io_adapter { __u8 isc; __u8 maskable; __u8 swap; - __u8 pad; + __u8 flags; }; id contains the unique id for the adapter, isc the I/O interruption subclass - to use, maskable whether this adapter may be masked (interrupts turned off) - and swap whether the indicators need to be byte swapped. + to use, maskable whether this adapter may be masked (interrupts turned off), + swap whether the indicators need to be byte swapped, and flags contains + further characteristics of the adapter. + Currently defined values for 'flags' are: + - KVM_S390_ADAPTER_SUPPRESSIBLE: adapter is subject to AIS + (adapter-interrupt-suppression) facility. This flag only has an effect if + the AIS capability is enabled. + Unknown flag values are ignored. KVM_DEV_FLIC_ADAPTER_MODIFY |