VmTdExitVeHandler.c File Reference

#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include "VmTdExitHandler.h"
#include <Library/VmgExitLib.h>
#include <Library/BaseMemoryLib.h>
#include <IndustryStandard/Tdx.h>
#include <IndustryStandard/InstructionParsing.h>

Go to the source code of this file.

Data Structures
union	MSR_DATA
union	REX
union	MODRM
struct	CPUID_DATA

Macros
#define	TDX_DECODER_BUG_ON(x)

Functions
STATIC UINT64 EFIAPI	CpuIdExit (IN EFI_SYSTEM_CONTEXT_X64 *Regs, IN TDCALL_VEINFO_RETURN_DATA *Veinfo)
STATIC UINT64 EFIAPI	IoExit (IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, IN TDCALL_VEINFO_RETURN_DATA *Veinfo)
STATIC UINT64	ReadMsrExit (IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, IN TDCALL_VEINFO_RETURN_DATA *Veinfo)
STATIC UINT64	WriteMsrExit (IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, IN TDCALL_VEINFO_RETURN_DATA *Veinfo)
STATIC VOID EFIAPI	TdxDecodeInstruction (IN UINT8 *Rip)
STATIC UINT64 *EFIAPI	GetRegFromContext (IN EFI_SYSTEM_CONTEXT_X64 *Regs, IN UINTN RegIndex)
STATIC INTN EFIAPI	MmioExit (IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, IN TDCALL_VEINFO_RETURN_DATA *Veinfo)
EFI_STATUS EFIAPI	VmTdExitHandleVe (IN OUT EFI_EXCEPTION_TYPE *ExceptionType, IN OUT EFI_SYSTEM_CONTEXT SystemContext)

Detailed Description

Copyright (c) 2021, Intel Corporation. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file VmTdExitVeHandler.c.

Macro Definition Documentation

TDX_DECODER_BUG_ON

#define TDX_DECODER_BUG_ON

(

x

)

Value:

  if ((x)) {                                \
    TdxDecodeInstruction(Rip);              \
    TdVmCall(TDVMCALL_HALT, 0, 0, 0, 0, 0); \
  }

Definition at line 232 of file VmTdExitVeHandler.c.

Function Documentation

CpuIdExit()

STATIC UINT64 EFIAPI CpuIdExit	(	IN EFI_SYSTEM_CONTEXT_X64 *	Regs,
		IN TDCALL_VEINFO_RETURN_DATA *	Veinfo
	)

Handle an CPUID event.

Use the TDVMCALL instruction to handle cpuid #ve

Parameters

[in,out]	Regs	x64 processor context
[in]	Veinfo	VE Info

Return values

0	Event handled successfully

Returns

New exception value to propagate

Definition at line 62 of file VmTdExitVeHandler.c.

GetRegFromContext()

STATIC UINT64 *EFIAPI GetRegFromContext	(	IN EFI_SYSTEM_CONTEXT_X64 *	Regs,
		IN UINTN	RegIndex
	)

Definition at line 241 of file VmTdExitVeHandler.c.

IoExit()

STATIC UINT64 EFIAPI IoExit	(	IN OUT EFI_SYSTEM_CONTEXT_X64 *	Regs,
		IN TDCALL_VEINFO_RETURN_DATA *	Veinfo
	)

Handle an IO event.

Use the TDVMCALL instruction to handle either an IO read or an IO write.

Parameters

[in,out]	Regs	x64 processor context
[in]	Veinfo	VE Info

Return values

0	Event handled successfully

Returns

New exception value to propagate

Definition at line 96 of file VmTdExitVeHandler.c.

MmioExit()

STATIC INTN EFIAPI MmioExit	(	IN OUT EFI_SYSTEM_CONTEXT_X64 *	Regs,
		IN TDCALL_VEINFO_RETURN_DATA *	Veinfo
	)

Handle an MMIO event.

Use the TDVMCALL instruction to handle either an mmio read or an mmio write.

Parameters

[in,out]	Regs	x64 processor context
[in]	Veinfo	VE Info

Return values

0	Event handled successfully

Returns

New exception value to propagate

Definition at line 298 of file VmTdExitVeHandler.c.

ReadMsrExit()

STATIC UINT64 ReadMsrExit	(	IN OUT EFI_SYSTEM_CONTEXT_X64 *	Regs,
		IN TDCALL_VEINFO_RETURN_DATA *	Veinfo
	)

Handle an READ MSR event.

Use the TDVMCALL instruction to handle msr read

Parameters

[in,out]	Regs	x64 processor context
[in]	Veinfo	VE Info

Return values

0	Event handled successfully

Returns

New exception value to propagate

Definition at line 169 of file VmTdExitVeHandler.c.

TdxDecodeInstruction()

STATIC VOID EFIAPI TdxDecodeInstruction

(

IN UINT8 *

Rip

)

Definition at line 218 of file VmTdExitVeHandler.c.

VmTdExitHandleVe()

EFI_STATUS EFIAPI VmTdExitHandleVe	(	IN OUT EFI_EXCEPTION_TYPE *	ExceptionType,
		IN OUT EFI_SYSTEM_CONTEXT	SystemContext
	)

Handle a #VE exception.

Performs the necessary processing to handle a #VE exception.

Parameters

[in,out]	ExceptionType	Pointer to an EFI_EXCEPTION_TYPE to be set as value to use on error.
[in,out]	SystemContext	Pointer to EFI_SYSTEM_CONTEXT

Return values

EFI_SUCCESS	Exception handled
EFI_UNSUPPORTED	#VE not supported, (new) exception value to propagate provided
EFI_PROTOCOL_ERROR	#VE handling failed, (new) exception value to propagate provided

Definition at line 449 of file VmTdExitVeHandler.c.

WriteMsrExit()

STATIC UINT64 WriteMsrExit	(	IN OUT EFI_SYSTEM_CONTEXT_X64 *	Regs,
		IN TDCALL_VEINFO_RETURN_DATA *	Veinfo
	)

Handle an WRITE MSR event.

Use the TDVMCALL instruction to handle msr write

Parameters

[in,out]	Regs	x64 processor context
[in]	Veinfo	VE Info

Return values

0	Event handled successfully

Returns

New exception value to propagate

Definition at line 199 of file VmTdExitVeHandler.c.