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UefiCpuPkg/VmgExitLib: Add interfaces to set/read GHCB ValidBitmap bits 

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>
This commit is contained in:
Tom Lendacky 2020-11-06 11:53:04 -06:00 committed by mergify[bot]
parent 990ab937c2
commit 8a7ca9923e
2 changed files with 79 additions and 0 deletions
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37
UefiCpuPkg/Include/Library/VmgExitLib.h
View File

@ -74,6 +74,43 @@ VmgDone (
IN OUT GHCB *Ghcb
);
/**
Marks a 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 A pointer to the GHCB
@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
);
/**
Handle a #VC exception.

42
UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.c
View File

@ -89,6 +89,48 @@ VmgDone (
{
}
/**
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.