vm load: fix bug in loading kernel

According to the explaination for pref_address
in Documentation/x86/boot.txt, a relocating bootloader
should attempt to load kernel at pref_address if possible.
But due to a non-relocatable kernel will unconditionally
move itself and to run at perf address, no need to copy
kernel to perf_address by bootloader.

Signed-off-by: Zheng, Gen <gen.zheng@intel.com>

hypervisor/include/arch/x86/zeropage.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2018 Intel Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ZEROPAGE_H
+#define ZEROPAGE_H
+
+struct zero_page {
+	uint8_t pad1[0x1e8];	/* 0x000 */
+	uint8_t e820_nentries;	/* 0x1e8 */
+	uint8_t pad2[0x8];	/* 0x1e9 */
+
+	struct {
+		uint8_t setup_sects;	/* 0x1f1 */
+		uint8_t hdr_pad1[0x1e];	/* 0x1f2 */
+		uint8_t loader_type;	/* 0x210 */
+		uint8_t load_flags;	/* 0x211 */
+		uint8_t hdr_pad2[0x6];	/* 0x212 */
+		uint32_t ramdisk_addr;	/* 0x218 */
+		uint32_t ramdisk_size;	/* 0x21c */
+		uint8_t hdr_pad3[0x8];	/* 0x220 */
+		uint32_t bootargs_addr;	/* 0x228 */
+		uint8_t hdr_pad4[0x8];	/* 0x22c */
+		uint8_t relocatable_kernel; /* 0x234 */
+		uint8_t hdr_pad5[0x13];    /* 0x235 */
+		uint32_t payload_offset;/* 0x248 */
+		uint32_t payload_length;/* 0x24c */
+		uint8_t hdr_pad6[0x8];	/* 0x250 */
+		uint64_t pref_addr;     /* 0x258 */
+		uint8_t hdr_pad7[8];    /* 0x260 */
+	} __packed hdr;
+
+	uint8_t pad3[0x68];	/* 0x268 */
+	struct e820_entry e820[0x80];	/* 0x2d0 */
+	uint8_t pad4[0x330];	/* 0xcd0 */
+} __packed;
+
+#endif