HvExtCallQueryCapabilities

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