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HvCallEnablePartitionVtl

  • Article

The HvCallEnablePartitionVtl hypercall enables a virtual trust level for a specified partition. It should be used in conjunction with HvCallEnableVpVtl to initiate and use a new VTL.

Interface

typedef union
{
   UINT8 AsUINT8;
   struct {
       UINT8 EnableMbec:1;
       UINT8 Reserved:7;
   };
} HV_ENABLE_PARTITION_VTL_FLAGS;

HV_STATUS
HvCallEnablePartitionVtl(
   _In_ HV_PARTITION_ID TargetPartitionId,
   _In_ HV_VTL TargetVtl,
   _In_ HV_ENABLE_PARTITION_VTL_FLAGS Flags
   );

Restrictions

  • A launching VTL can always enable a target VTL if the target VTL is lower than the launching VTL.
  • A launching VTL can enable a higher target VTL if the launching VTL is the highest VTL enabled for the partition that is lower than the target VTL.

Call Code

0x000D (Simple)

Input Parameters

Name Offset Size Information Provided
TargetPartitionId 0 8 Supplies the partition ID of the partition this request is for.
TargetVtl 8 1 Specifies the VTL to be enabled by this hypercall.
Flags 9 1 Specifies a mask to enable VSM related features.
RsvdZ 10 6