Revamp the x86 instruction emulation in bhyve.

On a nested page table fault the hypervisor will:
- fetch the instruction using the guest %rip and %cr3
- decode the instruction in 'struct vie'
- emulate the instruction in host kernel context for local apic accesses
- any other type of mmio access is punted up to user-space (e.g. ioapic)

The decoded instruction is passed as collateral to the user-space process
that is handling the PAGING exit.

The emulation code is fleshed out to include more addressing modes (e.g. SIB)
and more types of operands (e.g. imm8). The source code is unified into a
single file (vmm_instruction_emul.c) that is compiled into vmm.ko as well
as /usr/sbin/bhyve.

Reviewed by:	grehan
Obtained from:	NetApp

1 files changed, 0 insertions, 91 deletions

diff --git a/sys/amd64/vmm/vmm_instruction_emul.h b/sys/amd64/vmm/vmm_instruction_emul.h
deleted file mode 100644
index 1fa9e2b..0000000
--- a/sys/amd64/vmm/vmm_instruction_emul.h
+++ /dev/null
@@ -1,91 +0,0 @@
-/*-
- * Copyright (c) 2012 NetApp, Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. 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.
- *
- * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``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 NETAPP, INC 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.
- *
- * $FreeBSD$
- */
-
-#ifndef _VMM_INSTRUCTION_EMUL_H_
-#define _VMM_INSTRUCTION_EMUL_H_
-
-enum vie_op_size {
-	VIE_OP_SIZE_32BIT,		/* default */
-	VIE_OP_SIZE_64BIT,
-	VIE_OP_SIZE_8BIT
-};
-
-#define	VIE_INST_SIZE	15
-struct vie {
-	uint8_t		inst[VIE_INST_SIZE];
-
-	uint8_t		rex_w:1,
-			rex_r:1,
-			rex_x:1,
-			rex_b:1;
-
-	uint8_t		mod:2,
-			reg:4,
-			rm:4;
-
-
-	uint8_t		opcode_byte;
-	uint16_t	opcode_flags;
-	uint8_t		disp_bytes;
-	uint8_t		imm_bytes;
-
-	int		num_valid;
-	int		num_processed;
-
-	enum vm_reg_name base_register;
-	enum vm_reg_name index_register;
-	enum vm_reg_name operand_register;
-
-	int		op_size;
-	int64_t		displacement;
-	int64_t		immediate;
-};
-
-#define	VIE_F_HAS_MODRM	(1 << 0)
-#define	VIE_F_FROM_RM	(1 << 1)
-#define	VIE_F_FROM_REG	(1 << 2)
-#define	VIE_F_TO_RM	(1 << 3)
-#define	VIE_F_TO_REG	(1 << 4)
-#define	VIE_F_FROM_IMM	(1 << 5)
-
-#define	VIE_MOD_INDIRECT		0
-#define	VIE_MOD_INDIRECT_DISP8		1
-#define	VIE_MOD_INDIRECT_DISP32		2
-#define	VIE_MOD_DIRECT			3
-
-#define	VIE_RM_SIB			4
-#define	VIE_RM_DISP32			5
-
-struct vm;
-
-int	vmm_fetch_instruction(struct vm *vm, uint64_t rip, int inst_length,
-			      uint64_t cr3, struct vie *vie);
-
-int	vmm_decode_instruction(struct vie *vie);
-
-#endif