mirror of https://github.com/acidanthera/audk.git
166 lines
4.6 KiB
C
166 lines
4.6 KiB
C
/** @file
|
|
VMGEXIT Base Support Library.
|
|
|
|
Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#include <Base.h>
|
|
#include <Uefi.h>
|
|
#include <Library/VmgExitLib.h>
|
|
|
|
/**
|
|
Perform VMGEXIT.
|
|
|
|
Sets the necessary fields of the GHCB, invokes the VMGEXIT instruction and
|
|
then handles the return actions.
|
|
|
|
The base library function returns an error in the form of a
|
|
GHCB_EVENT_INJECTION representing a GP_EXCEPTION.
|
|
|
|
@param[in, out] Ghcb A pointer to the GHCB
|
|
@param[in] ExitCode VMGEXIT code to be assigned to the SwExitCode
|
|
field of the GHCB.
|
|
@param[in] ExitInfo1 VMGEXIT information to be assigned to the
|
|
SwExitInfo1 field of the GHCB.
|
|
@param[in] ExitInfo2 VMGEXIT information to be assigned to the
|
|
SwExitInfo2 field of the GHCB.
|
|
|
|
@retval 0 VMGEXIT succeeded.
|
|
@return Exception number to be propagated, VMGEXIT
|
|
processing did not succeed.
|
|
|
|
**/
|
|
UINT64
|
|
EFIAPI
|
|
VmgExit (
|
|
IN OUT GHCB *Ghcb,
|
|
IN UINT64 ExitCode,
|
|
IN UINT64 ExitInfo1,
|
|
IN UINT64 ExitInfo2
|
|
)
|
|
{
|
|
GHCB_EVENT_INJECTION Event;
|
|
|
|
Event.Uint64 = 0;
|
|
Event.Elements.Vector = GP_EXCEPTION;
|
|
Event.Elements.Type = GHCB_EVENT_INJECTION_TYPE_EXCEPTION;
|
|
Event.Elements.Valid = 1;
|
|
|
|
return Event.Uint64;
|
|
}
|
|
|
|
/**
|
|
Perform pre-VMGEXIT initialization/preparation.
|
|
|
|
Performs the necessary steps in preparation for invoking VMGEXIT. Must be
|
|
called before setting any fields within the GHCB.
|
|
|
|
@param[in, out] Ghcb A pointer to the GHCB
|
|
@param[in, out] InterruptState A pointer to hold the current interrupt
|
|
state, used for restoring in VmgDone ()
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
VmgInit (
|
|
IN OUT GHCB *Ghcb,
|
|
IN OUT BOOLEAN *InterruptState
|
|
)
|
|
{
|
|
}
|
|
|
|
/**
|
|
Perform post-VMGEXIT cleanup.
|
|
|
|
Performs the necessary steps to cleanup after invoking VMGEXIT. Must be
|
|
called after obtaining needed fields within the GHCB.
|
|
|
|
@param[in, out] Ghcb A pointer to the GHCB
|
|
@param[in] InterruptState An indicator to conditionally (re)enable
|
|
interrupts
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
VmgDone (
|
|
IN OUT GHCB *Ghcb,
|
|
IN BOOLEAN InterruptState
|
|
)
|
|
{
|
|
}
|
|
|
|
/**
|
|
Marks a field at the specified offset as valid in the GHCB.
|
|
|
|
The ValidBitmap area represents the areas of the GHCB that have been marked
|
|
valid. Set the bit in ValidBitmap for the input offset.
|
|
|
|
@param[in, out] Ghcb Pointer to the Guest-Hypervisor Communication Block
|
|
@param[in] Offset Qword offset in the GHCB to mark valid
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
VmgSetOffsetValid (
|
|
IN OUT GHCB *Ghcb,
|
|
IN GHCB_REGISTER Offset
|
|
)
|
|
{
|
|
}
|
|
|
|
/**
|
|
Checks if a specified offset is valid in the GHCB.
|
|
|
|
The ValidBitmap area represents the areas of the GHCB that have been marked
|
|
valid. Return whether the bit in the ValidBitmap is set for the input offset.
|
|
|
|
@param[in] Ghcb A pointer to the GHCB
|
|
@param[in] Offset Qword offset in the GHCB to mark valid
|
|
|
|
@retval TRUE Offset is marked valid in the GHCB
|
|
@retval FALSE Offset is not marked valid in the GHCB
|
|
|
|
**/
|
|
BOOLEAN
|
|
EFIAPI
|
|
VmgIsOffsetValid (
|
|
IN GHCB *Ghcb,
|
|
IN GHCB_REGISTER Offset
|
|
)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
Handle a #VC exception.
|
|
|
|
Performs the necessary processing to handle a #VC exception.
|
|
|
|
The base library function returns an error equal to VC_EXCEPTION,
|
|
to be propagated to the standard exception handling stack.
|
|
|
|
@param[in, out] ExceptionType Pointer to an EFI_EXCEPTION_TYPE to be set
|
|
as value to use on error.
|
|
@param[in, out] SystemContext Pointer to EFI_SYSTEM_CONTEXT
|
|
|
|
@retval EFI_SUCCESS Exception handled
|
|
@retval EFI_UNSUPPORTED #VC not supported, (new) exception value to
|
|
propagate provided
|
|
@retval EFI_PROTOCOL_ERROR #VC handling failed, (new) exception value to
|
|
propagate provided
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
VmgExitHandleVc (
|
|
IN OUT EFI_EXCEPTION_TYPE *ExceptionType,
|
|
IN OUT EFI_SYSTEM_CONTEXT SystemContext
|
|
)
|
|
{
|
|
*ExceptionType = VC_EXCEPTION;
|
|
|
|
return EFI_UNSUPPORTED;
|
|
}
|