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authorFei Li <sherrylf@linux.vnet.ibm.com>2017-01-19 17:02:26 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2017-04-06 13:15:36 +0200
commit08fab50da669e5ee5a542592895fcb63be3cd7b1 (patch)
tree5a5a6da1eabfa35708d2f96e4c510f2433374052 /Documentation/virtual
parent4e0b1ab72b8af961bcaca9ec1475279c1cd9579c (diff)
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')
-rw-r--r--Documentation/virtual/kvm/devices/s390_flic.txt12
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