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diff --git a/target/i386/hvf/x86_mmu.h b/target/i386/hvf/x86_mmu.h
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+/*
+ * Copyright (C) 2016 Veertu Inc,
+ * Copyright (C) 2017 Google Inc,
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __X86_MMU_H__
+#define __X86_MMU_H__
+
+#define PT_PRESENT (1 << 0)
+#define PT_WRITE (1 << 1)
+#define PT_USER (1 << 2)
+#define PT_WT (1 << 3)
+#define PT_CD (1 << 4)
+#define PT_ACCESSED (1 << 5)
+#define PT_DIRTY (1 << 6)
+#define PT_PS (1 << 7)
+#define PT_GLOBAL (1 << 8)
+#define PT_NX (1llu << 63)
+
+/* error codes */
+#define MMU_PAGE_PT (1 << 0)
+#define MMU_PAGE_WT (1 << 1)
+#define MMU_PAGE_US (1 << 2)
+#define MMU_PAGE_NX (1 << 3)
+
+bool mmu_gva_to_gpa(struct CPUState *cpu, target_ulong gva, uint64_t *gpa);
+
+void vmx_write_mem(struct CPUState *cpu, target_ulong gva, void *data, int bytes);
+void vmx_read_mem(struct CPUState *cpu, void *data, target_ulong gva, int bytes);
+
+#endif /* __X86_MMU_H__ */