From 08fab50da669e5ee5a542592895fcb63be3cd7b1 Mon Sep 17 00:00:00 2001 From: Fei Li Date: Thu, 19 Jan 2017 17:02:26 +0100 Subject: 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 Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- Documentation/virtual/kvm/devices/s390_flic.txt | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) (limited to 'Documentation/virtual') 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 -- cgit v1.2.3