[edk2-devel] [PATCH v3 02/11] UefiCpuPkg/VmgExitLib: Add interfaces to set/read GHCB ValidBitmap bits
Laszlo Ersek
lersek at redhat.com
Tue Nov 3 16:38:39 UTC 2020
Ray, Eric, can one of you please ACK this patch? I've reviewed it
already, but your ACK would be appreciated, process-wise. I intend to
merge the series on Thursday at the latest (Nov 5th).
Thank you.
Laszlo
On 10/29/20 15:17, Lendacky, Thomas wrote:
> From: Tom Lendacky <thomas.lendacky at amd.com>
>
> 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 at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Laszlo Ersek <lersek at redhat.com>
> Cc: Rahul Kumar <rahul1.kumar at intel.com>
> Reviewed-by: Laszlo Ersek <lersek at redhat.com>
> Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
> ---
> UefiCpuPkg/Include/Library/VmgExitLib.h | 37 +++++++++++++++++
> UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.c | 42 ++++++++++++++++++++
> 2 files changed, 79 insertions(+)
>
> diff --git a/UefiCpuPkg/Include/Library/VmgExitLib.h b/UefiCpuPkg/Include/Library/VmgExitLib.h
> index 45fc27d35e29..07e8af6450b9 100644
> --- a/UefiCpuPkg/Include/Library/VmgExitLib.h
> +++ b/UefiCpuPkg/Include/Library/VmgExitLib.h
> @@ -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.
>
> diff --git a/UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.c b/UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.c
> index bb265e1700d2..b47e282aff82 100644
> --- a/UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.c
> +++ b/UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.c
> @@ -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.
>
>
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#66935): https://edk2.groups.io/g/devel/message/66935
Mute This Topic: https://groups.io/mt/77888113/1813853
Group Owner: devel+owner at edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [edk2-devel-archive at redhat.com]
-=-=-=-=-=-=-=-=-=-=-=-
More information about the edk2-devel-archive
mailing list