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KVM: s390: interface for suppressible I/O adapters

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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>
This commit is contained in:
Fei Li
2017-04-06 13:15:36 +02:00
committed by Christian Borntraeger
parent 4e0b1ab72b
commit 08fab50da6
4 changed files with 15 additions and 4 deletions
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arch/s390/include/uapi/asm/kvm.h
+3 -1
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@@ -41,9 +41,11 @@ struct kvm_s390_io_adapter {
__u8 isc;
__u8 maskable;
__u8 swap;
__u8 pad;
__u8 flags;
};
#define KVM_S390_ADAPTER_SUPPRESSIBLE 0x01
#define KVM_S390_IO_ADAPTER_MASK 1
#define KVM_S390_IO_ADAPTER_MAP 2
#define KVM_S390_IO_ADAPTER_UNMAP 3