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OvmfPkg/VmgExitLib: Implement new VmgExitLib interfaces

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3008

The VmgExitLib library added two new interfaces, VmgSetOffsetValid() and
VmgIsOffsetValid(), that must now be implemented in the OvmfPkg version
of the library.

Implement VmgSetOffsetValid() and VmgIsOffsetValid() and update existing
code, that is directly accessing ValidBitmap, to use the new interfaces.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <939e9dc375e6085bc67942fe9a00ecd4c6b77ecf.1604685192.git.thomas.lendacky@amd.com>
This commit is contained in:
Tom Lendacky
2020-11-06 11:53:05 -06:00
committed by mergify[bot]
parent 8a7ca9923e
commit a13967f2a3
2 changed files with 85 additions and 87 deletions
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54
OvmfPkg/Library/VmgExitLib/VmgExitLib.c
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@@ -157,3 +157,57 @@ 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
)
{
UINT32 OffsetIndex;
UINT32 OffsetBit;
OffsetIndex = Offset / 8;
OffsetBit = Offset % 8;
Ghcb->SaveArea.ValidBitmap[OffsetIndex] |= (1 << OffsetBit);
}
/**
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
)
{
UINT32 OffsetIndex;
UINT32 OffsetBit;
OffsetIndex = Offset / 8;
OffsetBit = Offset % 8;
return ((Ghcb->SaveArea.ValidBitmap[OffsetIndex] & (1 << OffsetBit)) != 0);
}