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diff --git a/include/xen/interface/hvm/ioreq.h b/include/xen/interface/hvm/ioreq.h
new file mode 100644
index 000000000..8e92b004b
--- /dev/null
+++ b/include/xen/interface/hvm/ioreq.h
@@ -0,0 +1,99 @@
+/*
+ * ioreq.h: I/O request definitions for device models
+ * Copyright (c) 2004, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ */
+
+#ifndef _IOREQ_H_
+#define _IOREQ_H_
+
+#define IOREQ_READ      1
+#define IOREQ_WRITE     0
+
+#define STATE_INVALID           0
+#define STATE_IOREQ_READY       1
+#define STATE_IOREQ_INPROCESS   2
+#define STATE_IORESP_READY      3
+
+#define IOREQ_TYPE_PIO          0 /* pio */
+#define IOREQ_TYPE_COPY         1 /* mmio ops */
+#define IOREQ_TYPE_AND          2
+#define IOREQ_TYPE_OR           3
+#define IOREQ_TYPE_XOR          4
+#define IOREQ_TYPE_XCHG         5
+
+/*
+ * VMExit dispatcher should cooperate with instruction decoder to
+ * prepare this structure and notify service OS and DM by sending
+ * virq
+ */
+struct ioreq {
+    uint64_t addr;          /*  physical address            */
+    uint64_t size;          /*  size in bytes               */
+    uint64_t count;         /*  for rep prefixes            */
+    union {
+        uint64_t data;      /*  data                        */
+        void    *pdata;     /*  pointer to data             */
+    } u;
+    uint8_t state:4;
+    uint8_t pdata_valid:1;  /* if 1, use pdata above        */
+    uint8_t dir:1;          /*  1=read, 0=write             */
+    uint8_t df:1;
+    uint8_t type;           /* I/O type                     */
+    uint64_t io_count;      /* How many IO done on a vcpu   */
+};
+typedef struct ioreq ioreq_t;
+
+struct global_iodata {
+    uint16_t    pic_elcr;
+    uint16_t    pic_irr;
+    uint16_t    pic_last_irr;
+    uint16_t    pic_clear_irr;
+};
+typedef struct global_iodata global_iodata_t;
+
+struct vcpu_iodata {
+    struct ioreq         vp_ioreq;
+    /* Event channel port */
+    unsigned int    vp_eport;   /* VMX vcpu uses this to notify DM */
+};
+typedef struct vcpu_iodata vcpu_iodata_t;
+
+struct shared_iopage {
+    struct global_iodata sp_global;
+    struct vcpu_iodata   vcpu_iodata[1];
+};
+typedef struct shared_iopage shared_iopage_t;
+
+#define IOREQ_BUFFER_SLOT_NUM     80
+struct buffered_iopage {
+    unsigned long   read_pointer;
+    unsigned long   write_pointer;
+    ioreq_t         ioreq[IOREQ_BUFFER_SLOT_NUM];
+};            /* sizeof this structure must be in one page */
+typedef struct buffered_iopage buffered_iopage_t;
+
+#endif /* _IOREQ_H_ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */