Since physical vmcs is unknown, a customized virtual vmcs (vvmcs) is
introduced. It converts the vmcs encoding to an offset into vvmcs page.
Signed-off-by: Qing He <qing.he@xxxxxxxxx>
---
vvmcs.h | 154 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 154 insertions(+)
diff -r fe50c7458a43 -r 9cb31076d2d0 xen/include/asm-x86/hvm/vmx/vvmcs.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/include/asm-x86/hvm/vmx/vvmcs.h Thu Apr 22 22:30:09 2010 +0800
@@ -0,0 +1,154 @@
+/*
+ * vvmcs.h: virtual VMCS access for nested virtualization.
+ *
+ * Copyright (c) 2010, Intel Corporation.
+ * Author: Qing He <qing.he@xxxxxxxxx>
+ *
+ * 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.
+ *
+ */
+
+#include <xen/config.h>
+#include <asm/types.h>
+
+/*
+ * Virtual VMCS layout
+ *
+ * Since physical VMCS layout is unknown, a custom layout is used
+ * for virtual VMCS seen by guest. It occupies a 4k page, and the
+ * field is offset by an 9-bit offset into u64[], The offset is as
+ * follow, which means every <width, type> pair has a max of 32
+ * fields available.
+ *
+ * 9 7 5 0
+ * --------------------------------
+ * offset: | width | type | index |
+ * --------------------------------
+ *
+ * Also, since the lower range <width=0, type={0,1}> has only one
+ * field: VPID, it is moved to a higher offset (63), and leaves the
+ * lower range to non-indexed field like VMCS revision.
+ *
+ */
+
+#define VVMCS_REVISION 0x40000001u
+
+struct vvmcs_header {
+ u32 revision;
+ u32 abort;
+};
+
+union vmcs_encoding {
+ struct {
+ u32 access_type : 1;
+ u32 index : 9;
+ u32 type : 2;
+ u32 rsv1 : 1;
+ u32 width : 2;
+ u32 rsv2 : 17;
+ };
+ u32 word;
+};
+
+enum vvmcs_encoding_width {
+ VVMCS_WIDTH_16 = 0,
+ VVMCS_WIDTH_64,
+ VVMCS_WIDTH_32,
+ VVMCS_WIDTH_NATURAL,
+};
+
+enum vvmcs_encoding_type {
+ VVMCS_TYPE_CONTROL = 0,
+ VVMCS_TYPE_RO,
+ VVMCS_TYPE_GSTATE,
+ VVMCS_TYPE_HSTATE,
+};
+
+static inline int vvmcs_offset(u32 width, u32 type, u32 index)
+{
+ int offset;
+
+ offset = (index & 0x1f) | type << 5 | width << 7;
+
+ if ( offset == 0 ) /* vpid */
+ offset = 0x3f;
+
+ return offset;
+}
+
+static inline u64 __get_vvmcs(void *vvmcs, u32 vmcs_encoding)
+{
+ union vmcs_encoding enc;
+ u64 *content = (u64 *) vvmcs;
+ int offset;
+ u64 res;
+
+ enc.word = vmcs_encoding;
+ offset = vvmcs_offset(enc.width, enc.type, enc.index);
+ res = content[offset];
+
+ switch ( enc.width ) {
+ case VVMCS_WIDTH_16:
+ res &= 0xffff;
+ break;
+ case VVMCS_WIDTH_64:
+ if ( enc.access_type )
+ res >>= 32;
+ break;
+ case VVMCS_WIDTH_32:
+ res &= 0xffffffff;
+ break;
+ case VVMCS_WIDTH_NATURAL:
+ default:
+ break;
+ }
+
+ return res;
+}
+
+static inline void __set_vvmcs(void *vvmcs, u32 vmcs_encoding, u64 val)
+{
+ union vmcs_encoding enc;
+ u64 *content = (u64 *) vvmcs;
+ int offset;
+ u64 res;
+
+ enc.word = vmcs_encoding;
+ offset = vvmcs_offset(enc.width, enc.type, enc.index);
+ res = content[offset];
+
+ switch ( enc.width ) {
+ case VVMCS_WIDTH_16:
+ res = val & 0xffff;
+ break;
+ case VVMCS_WIDTH_64:
+ if ( enc.access_type )
+ {
+ res &= 0xffffffff;
+ res |= val << 32;
+ }
+ else
+ res = val;
+ break;
+ case VVMCS_WIDTH_32:
+ res = val & 0xffffffff;
+ break;
+ case VVMCS_WIDTH_NATURAL:
+ default:
+ res = val;
+ break;
+ }
+
+ content[offset] = res;
+}
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