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The HvCallNotifyLongSpinWait hypercall is used by a guest OS to notify the hypervisor that the calling virtual processor is attempting to acquire a resource that is potentially held by another virtual processor within the same partition. This scheduling hint improves the scalability of partitions with more than one virtual processor.
Interface
HV_STATUS
HvCallNotifyLongSpinWait(
_In_ UINT64 SpinCount
);
Call Code
0x0008 (Simple)
Input Parameters
| Name | Offset | Size | Information Provided |
|---|---|---|---|
SpinCount |
0 | 4 | Specifies the accumulated count the guest was spinning. |
| RsvdZ | 4 | 4 |
Return Values
There is no error status for this hypercall, only HV_STATUS_SUCCESS will be returned as this is an advisory hypercall.