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KVM: ioeventfd for virtio-ccw devices.

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Enhance KVM_IOEVENTFD with a new flag that allows to attach to virtio-ccw
devices on s390 via the KVM_VIRTIO_CCW_NOTIFY_BUS.

Signed-off-by: Cornelia Huck <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
This commit is contained in:
Cornelia Huck 2013-02-28 12:33:20 +01:00 • committed by Marcelo Tosatti
commit 2b83451b45
3 changed files with 24 additions and 4 deletions
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8
Documentation/virtual/kvm/api.txt
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@ -1486,15 +1486,23 @@ struct kvm_ioeventfd {
__u8 pad[36];
};
For the special case of virtio-ccw devices on s390, the ioevent is matched
to a subchannel/virtqueue tuple instead.
The following flags are defined:
#define KVM_IOEVENTFD_FLAG_DATAMATCH (1 << kvm_ioeventfd_flag_nr_datamatch)
#define KVM_IOEVENTFD_FLAG_PIO (1 << kvm_ioeventfd_flag_nr_pio)
#define KVM_IOEVENTFD_FLAG_DEASSIGN (1 << kvm_ioeventfd_flag_nr_deassign)
#define KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY \
(1 << kvm_ioeventfd_flag_nr_virtio_ccw_notify)
If datamatch flag is set, the event will be signaled only if the written value
to the registered address is equal to datamatch in struct kvm_ioeventfd.
For virtio-ccw devices, addr contains the subchannel id and datamatch the
virtqueue index.
4.60 KVM_DIRTY_TLB