---

yaml
---
r: 258013
b: refs/heads/master
c: 55399a0
h: refs/heads/master
i:
  258011: 8598a82
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 823e396558e509b7c3225cd76806f3d6643ff5f8
+refs/heads/master: 55399a02e90fdc6cd45165b2df5dd97b7c3f018f

trunk/Documentation/virtual/kvm/api.txt

@@ -1323,6 +1323,36 @@ struct kvm_lapic_state {
 Copies the input argument into the the Local APIC registers.  The data format
 and layout are the same as documented in the architecture manual.
 
+4.56 KVM_IOEVENTFD
+
+Capability: KVM_CAP_IOEVENTFD
+Architectures: all
+Type: vm ioctl
+Parameters: struct kvm_ioeventfd (in)
+Returns: 0 on success, !0 on error
+
+This ioctl attaches or detaches an ioeventfd to a legal pio/mmio address
+within the guest.  A guest write in the registered address will signal the
+provided event instead of triggering an exit.
+
+struct kvm_ioeventfd {
+	__u64 datamatch;
+	__u64 addr;        /* legal pio/mmio address */
+	__u32 len;         /* 1, 2, 4, or 8 bytes    */
+	__s32 fd;
+	__u32 flags;
+	__u8  pad[36];
+};
+
+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)
+
+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.
+
 5. The kvm_run structure
 
 Application code obtains a pointer to the kvm_run structure by