diff --git a/xen/common/viommu.c b/xen/common/viommu.c
index 55feb5d..b517158 100644
--- a/xen/common/viommu.c
+++ b/xen/common/viommu.c
@@ -163,6 +163,21 @@ int viommu_domctl(struct domain *d, struct xen_domctl_viommu_op *op,
     return rc;
 }
 
+int viommu_handle_irq_request(struct domain *d,
+                              struct arch_irq_remapping_request *request)
+{
+    struct viommu *viommu = d->viommu;
+
+    if ( !viommu )
+        return -EINVAL;
+
+    ASSERT(viommu->ops);
+    if ( !viommu->ops->handle_irq_request )
+        return -EINVAL;
+
+    return viommu->ops->handle_irq_request(d, request);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/asm-x86/viommu.h b/xen/include/asm-x86/viommu.h
new file mode 100644
index 0000000..366fbb6
--- /dev/null
+++ b/xen/include/asm-x86/viommu.h
@@ -0,0 +1,72 @@
+/*
+ * include/asm-x86/viommu.h
+ *
+ * Copyright (c) 2017 Intel Corporation.
+ * Author: Lan Tianyu <tianyu.lan@intel.com>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#ifndef __ARCH_X86_VIOMMU_H__
+#define __ARCH_X86_VIOMMU_H__
+
+/* IRQ request type */
+#define VIOMMU_REQUEST_IRQ_MSI          0
+#define VIOMMU_REQUEST_IRQ_APIC         1
+
+struct arch_irq_remapping_request
+{
+    union {
+        /* MSI */
+        struct {
+            uint64_t addr;
+            uint32_t data;
+        } msi;
+        /* Redirection Entry in IOAPIC */
+        uint64_t rte;
+    } msg;
+    uint16_t source_id;
+    uint8_t type;
+};
+
+static inline void irq_request_ioapic_fill(struct arch_irq_remapping_request *req,
+                                           uint32_t ioapic_id, uint64_t rte)
+{
+    ASSERT(req);
+    req->type = VIOMMU_REQUEST_IRQ_APIC;
+    req->source_id = ioapic_id;
+    req->msg.rte = rte;
+}
+
+static inline void irq_request_msi_fill(struct arch_irq_remapping_request *req,
+                                        uint32_t source_id, uint64_t addr,
+                                        uint32_t data)
+{
+    ASSERT(req);
+    req->type = VIOMMU_REQUEST_IRQ_MSI;
+    req->source_id = source_id;
+    req->msg.msi.addr = addr;
+    req->msg.msi.data = data;
+}
+
+#endif /* __ARCH_X86_VIOMMU_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/xen/viommu.h b/xen/include/xen/viommu.h
index baa8ab7..230f6b1 100644
--- a/xen/include/xen/viommu.h
+++ b/xen/include/xen/viommu.h
@@ -21,10 +21,13 @@
 #define __XEN_VIOMMU_H__
 
 struct viommu;
+struct arch_irq_remapping_request;
 
 struct viommu_ops {
     int (*create)(struct domain *d, struct viommu *viommu);
     int (*destroy)(struct viommu *viommu);
+    int (*handle_irq_request)(struct domain *d,
+                              struct arch_irq_remapping_request *request);
 };
 
 struct viommu {
@@ -45,11 +48,19 @@ int viommu_register_type(uint64_t type, struct viommu_ops *ops);
 int viommu_destroy_domain(struct domain *d);
 int viommu_domctl(struct domain *d, struct xen_domctl_viommu_op *op,
                   bool_t *need_copy);
+int viommu_handle_irq_request(struct domain *d,
+                              struct arch_irq_remapping_request *request);
 #else
 static inline int viommu_register_type(uint64_t type, struct viommu_ops *ops)
 {
     return -EINVAL;
 }
+static inline int
+viommu_handle_irq_request(struct domain *d,
+                          struct arch_irq_remapping_request *request)
+{
+    return -EINVAL;
+}
 #endif
 
 #endif /* __XEN_VIOMMU_H__ */
