HvCallGetVpCpuidValues

HvCallGetVpCpuidValues retrieves the CPUID values that are exposed to a specific virtual processor. This hypercall allows querying the virtualized CPUID information that the hypervisor presents to the guest, which may differ from the physical processor's CPUID values due to virtualization features and compatibility requirements.

Interface

HV_STATUS
HvCallGetVpCpuidValues(
    _In_ HV_PARTITION_ID        PartitionId,
    _In_ HV_VP_INDEX            VpIndex,
    _In_ HV_GET_VP_CPUID_VALUES_FLAGS Flags,
    _In_ UINT32 ReservedZ,
    _In_ const HV_CPUID_LEAF_INFO* CpuidLeafInfo, // Reads RepCount elements
    _Out_ HV_CPUID_RESULT*   CpuidResult // Writes RepCount elements
);

Call Code

0x00F4 (Rep)

Restrictions

Architecture: x64 only.

Input Parameters (per repetition element)

Name	Offset	Size	Information Provided
PartitionId	0	8	Target partition
VpIndex	8	4	VP index
Flags	12	4	Flags
ReservedZ	16	4	Reserved (Must be zero)
CpuidLeafInfo	24	8	Leaf/Subleaf descriptor

Output Parameters (per repetition element)

Name	Offset	Size	Information Provided
CpuidResult	0	16	EAX/EBX/ECX/EDX synthesized result

See Also

• HV_PARTITION_ID
• HV_VP_INDEX
• HV_GET_VP_CPUID_VALUES_FLAGS
• HV_CPUID_RESULT