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This hypercall reports the availability of extended hypercalls.
The availability of this hypercall must be queried using the EnableExtendedHypercalls partition privilege flag.
Interface
HV_STATUS
HvExtCallQueryCapabilities(
_Out_ UINT64 Capabilities
);
Call Code
0x8001 (Simple)
Output Parameters
| Name | Offset | Size | Information Provided |
|---|---|---|---|
Capabilities |
0 | 8 | Bitmask of supported extended hypercalls |
The bitmask of supported extended hypercalls has the following format:
| Bit | Extended Hypercall |
|---|---|
| 0 | HvExtCallGetBootZeroedMemory |
| 1 | HvExtCallMemoryHeatHint |
| 2 | HvExtCallEpfSetup |
| 3 | HvExtCallSchedulerAssistSetup |
| 4 | HvExtCallMemoryHeatHintAsync |
| 63-5 | Reserved |