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OvmfPkg/VmgExitLib: Add support for IOIO_PROT NAE events

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

Under SEV-ES, a IOIO_PROT intercept generates a #VC exception. VMGEXIT
must be used to allow the hypervisor to handle this intercept.

Add support to construct the required GHCB values to support a IOIO_PROT
NAE event.  Parse the instruction that generated the #VC exception,
setting the required register values in the GHCB and creating the proper
SW_EXITINFO1 value in the GHCB.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Tom Lendacky
2020-08-12 15:21:37 -05:00
committed by mergify[bot]
parent 61bacc0fa1
commit fb040cced3
2 changed files with 629 additions and 14 deletions
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83
OvmfPkg/Include/IndustryStandard/InstructionParsing.h Normal file
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/** @file
Instruction parsing support definitions.
Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __INSTRUCTION_PARSING_H__
#define __INSTRUCTION_PARSING_H__
#include <Base.h>
#include <Uefi.h>
//
// Instruction REX prefix definition
//
typedef union {
struct {
UINT8 BitB:1;
UINT8 BitX:1;
UINT8 BitR:1;
UINT8 BitW:1;
UINT8 Rex:4;
} Bits;
UINT8 Uint8;
} INSTRUCTION_REX_PREFIX;
//
// Instruction ModRM definition
//
typedef union {
struct {
UINT8 Rm:3;
UINT8 Reg:3;
UINT8 Mod:2;
} Bits;
UINT8 Uint8;
} INSTRUCTION_MODRM;
//
// Instruction SIB definition
//
typedef union {
struct {
UINT8 Base:3;
UINT8 Index:3;
UINT8 Scale:2;
} Bits;
UINT8 Uint8;
} INSTRUCTION_SIB;
//
// Legacy Instruction Prefixes
//
#define OVERRIDE_SEGMENT_CS 0x2E
#define OVERRIDE_SEGMENT_DS 0x3E
#define OVERRIDE_SEGMENT_ES 0x26
#define OVERRIDE_SEGMENT_SS 0x36
#define OVERRIDE_SEGMENT_FS 0x64
#define OVERRIDE_SEGMENT_GS 0x65
#define OVERRIDE_OPERAND_SIZE 0x66
#define OVERRIDE_ADDRESS_SIZE 0x67
#define LOCK_PREFIX 0xF0
#define REPNZ_PREFIX 0xF2
#define REPZ_PREFIX 0xF3
//
// REX Prefixes
//
#define REX_PREFIX_START 0x40
#define REX_PREFIX_STOP 0x4F
#define REX_64BIT_OPERAND_SIZE_MASK 0x08
//
// Two-byte Opcode Flag
//
#define TWO_BYTE_OPCODE_ESCAPE 0x0F
#endif