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/** @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.
The base library function does nothing.
@param[in, out] Ghcb A pointer to the GHCB
**/
VOID
EFIAPI
VmgInit (
IN OUT GHCB *Ghcb
)
{
}
/**
Perform post-VMGEXIT cleanup.
Performs the necessary steps to cleanup after invoking VMGEXIT. Must be
called after obtaining needed fields within the GHCB.
The base library function does nothing.
@param[in, out] Ghcb A pointer to the GHCB
**/
VOID
EFIAPI
VmgDone (
IN OUT GHCB *Ghcb
)
{
}
/**
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;
}
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