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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 2017-01-19 17:02:26 +01:00 committed by Christian Borntraeger
parent 4e0b1ab72b
commit 08fab50da6
4 changed files with 15 additions and 4 deletions
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12
Documentation/virtual/kvm/devices/s390_flic.txt
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@ -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

1
arch/s390/include/asm/kvm_host.h
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@ -621,6 +621,7 @@ struct s390_io_adapter {
bool maskable;
bool masked;
bool swap;
bool suppressible;
struct rw_semaphore maps_lock;
struct list_head maps;
atomic_t nr_maps;

4
arch/s390/include/uapi/asm/kvm.h
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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

2
arch/s390/kvm/interrupt.c
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@ -1997,6 +1997,8 @@ static int register_io_adapter(struct kvm_device *dev,
adapter->maskable = adapter_info.maskable;
adapter->masked = false;
adapter->swap = adapter_info.swap;
adapter->suppressible = (adapter_info.flags) &
KVM_S390_ADAPTER_SUPPRESSIBLE;
dev->kvm->arch.adapters[adapter->id] = adapter;
return 0;