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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2020-11-06 11:53:04 -0600 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-11-10 19:07:55 +0000 |
| commit | 8a7ca9923ec9d1071280f702e8bf59503a974621 (patch) | |
| tree | 2968e5007e3a737c4877913664eaef7c75cbf74b /UefiCpuPkg/Include | |
| parent | 990ab937c20cd2674e3e2697729f4530dfbabb92 (diff) | |
| download | edk2-8a7ca9923ec9d1071280f702e8bf59503a974621.tar.gz edk2-8a7ca9923ec9d1071280f702e8bf59503a974621.tar.bz2 edk2-8a7ca9923ec9d1071280f702e8bf59503a974621.zip | |
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>
Diffstat (limited to 'UefiCpuPkg/Include')
| -rw-r--r-- | UefiCpuPkg/Include/Library/VmgExitLib.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/UefiCpuPkg/Include/Library/VmgExitLib.h b/UefiCpuPkg/Include/Library/VmgExitLib.h index 45fc27d35e..07e8af6450 100644 --- a/UefiCpuPkg/Include/Library/VmgExitLib.h +++ b/UefiCpuPkg/Include/Library/VmgExitLib.h @@ -75,6 +75,43 @@ VmgDone ( );
/**
+ 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.
Performs the necessary processing to handle a #VC exception.
|