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authorCornelia Huck <cornelia.huck@de.ibm.com>2013-02-28 12:33:20 +0100
committerMarcelo Tosatti <mtosatti@redhat.com>2013-03-05 19:12:17 -0300
commit2b83451b45d720ca38c03878ce42ff9139cad9e3 (patch)
tree374b4ab82ffc115dc8cb76f783f7735521b6c7bf /Documentation/virtual
parent060f0ce6ff975decd1e0ee318c08e228bccbee1e (diff)
downloadlinux-2b83451b45d720ca38c03878ce42ff9139cad9e3.tar.bz2
KVM: ioeventfd for virtio-ccw devices.
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 <cornelia.huck@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/api.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 119358dfb742..c16b442556e8 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -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