8a7ca9923e
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3008 In upcoming patches, the setting of the bits in the GHCB ValidBitmap will be performed in multiple places. In order to reduce code duplication, add an interface, VmgSetOffsetValid(), to VmgExitLib library to perform this function. Also, to keep management of the ValidBitmap within the library, add an inteface, VmgIsOffsetValid(), to return whether the bit in the ValidBitmap is set for a specified offset. The new VmgSetOffsetValid() function is a VOID function and will be an empty function in the VmgExitLibNull implementation of the VmgExitLib library. The new VmgIsOffsetValid() function returns a BOOLEAN to indicate if the offset is valid. This will always return FALSE in the VmgExitLibNull implementation of the VmgExitLib library. Cc: Eric Dong <eric.dong@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Rahul Kumar <rahul1.kumar@intel.com> Acked-by: Eric Dong <eric.dong@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Message-Id: <0bcb2373f8c6e0171ae277d3d7c2eb284621355e.1604685192.git.thomas.lendacky@amd.com>
164 lines
4.3 KiB
C
164 lines
4.3 KiB
C
/** @file
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VMGEXIT Base Support Library.
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Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h>
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#include <Uefi.h>
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#include <Library/VmgExitLib.h>
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/**
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Perform VMGEXIT.
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Sets the necessary fields of the GHCB, invokes the VMGEXIT instruction and
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then handles the return actions.
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The base library function returns an error in the form of a
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GHCB_EVENT_INJECTION representing a GP_EXCEPTION.
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@param[in, out] Ghcb A pointer to the GHCB
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@param[in] ExitCode VMGEXIT code to be assigned to the SwExitCode
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field of the GHCB.
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@param[in] ExitInfo1 VMGEXIT information to be assigned to the
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SwExitInfo1 field of the GHCB.
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@param[in] ExitInfo2 VMGEXIT information to be assigned to the
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SwExitInfo2 field of the GHCB.
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@retval 0 VMGEXIT succeeded.
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@return Exception number to be propagated, VMGEXIT
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processing did not succeed.
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**/
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UINT64
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EFIAPI
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VmgExit (
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IN OUT GHCB *Ghcb,
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IN UINT64 ExitCode,
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IN UINT64 ExitInfo1,
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IN UINT64 ExitInfo2
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)
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{
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GHCB_EVENT_INJECTION Event;
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Event.Uint64 = 0;
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Event.Elements.Vector = GP_EXCEPTION;
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Event.Elements.Type = GHCB_EVENT_INJECTION_TYPE_EXCEPTION;
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Event.Elements.Valid = 1;
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return Event.Uint64;
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}
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/**
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Perform pre-VMGEXIT initialization/preparation.
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Performs the necessary steps in preparation for invoking VMGEXIT. Must be
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called before setting any fields within the GHCB.
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The base library function does nothing.
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@param[in, out] Ghcb A pointer to the GHCB
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**/
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VOID
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EFIAPI
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VmgInit (
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IN OUT GHCB *Ghcb
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)
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{
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}
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/**
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Perform post-VMGEXIT cleanup.
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Performs the necessary steps to cleanup after invoking VMGEXIT. Must be
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called after obtaining needed fields within the GHCB.
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The base library function does nothing.
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@param[in, out] Ghcb A pointer to the GHCB
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**/
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VOID
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EFIAPI
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VmgDone (
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IN OUT GHCB *Ghcb
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)
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{
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}
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/**
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Marks a field at the specified offset as valid in the GHCB.
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The ValidBitmap area represents the areas of the GHCB that have been marked
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valid. Set the bit in ValidBitmap for the input offset.
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@param[in, out] Ghcb Pointer to the Guest-Hypervisor Communication Block
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@param[in] Offset Qword offset in the GHCB to mark valid
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**/
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VOID
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EFIAPI
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VmgSetOffsetValid (
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IN OUT GHCB *Ghcb,
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IN GHCB_REGISTER Offset
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)
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{
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}
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/**
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Checks if a specified offset is valid in the GHCB.
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The ValidBitmap area represents the areas of the GHCB that have been marked
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valid. Return whether the bit in the ValidBitmap is set for the input offset.
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@param[in] Ghcb A pointer to the GHCB
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@param[in] Offset Qword offset in the GHCB to mark valid
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@retval TRUE Offset is marked valid in the GHCB
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@retval FALSE Offset is not marked valid in the GHCB
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**/
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BOOLEAN
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EFIAPI
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VmgIsOffsetValid (
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IN GHCB *Ghcb,
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IN GHCB_REGISTER Offset
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)
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{
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return FALSE;
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}
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/**
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Handle a #VC exception.
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Performs the necessary processing to handle a #VC exception.
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The base library function returns an error equal to VC_EXCEPTION,
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to be propagated to the standard exception handling stack.
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@param[in, out] ExceptionType Pointer to an EFI_EXCEPTION_TYPE to be set
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as value to use on error.
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@param[in, out] SystemContext Pointer to EFI_SYSTEM_CONTEXT
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@retval EFI_SUCCESS Exception handled
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@retval EFI_UNSUPPORTED #VC not supported, (new) exception value to
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propagate provided
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@retval EFI_PROTOCOL_ERROR #VC handling failed, (new) exception value to
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propagate provided
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**/
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EFI_STATUS
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EFIAPI
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VmgExitHandleVc (
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IN OUT EFI_EXCEPTION_TYPE *ExceptionType,
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IN OUT EFI_SYSTEM_CONTEXT SystemContext
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)
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{
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*ExceptionType = VC_EXCEPTION;
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return EFI_UNSUPPORTED;
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}
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