Standard Hypervisor CPUID Leaves
When the 0x40000000 leaf is queried, the hypervisor will return the maximum hypervisor CPUID leaf number and a vendor identifier signature. The following table provides the detailed return value information.
| Leaf | Hypervisor returns | |
|---|---|---|
|
0x40000000 |
Hypervisor CPUID leaf range and vendor identifier signature are returned in the following registers. | |
|
EAX |
The maximum input value for the hypervisor CPUID information, which determines the CPUID leaf range. | |
|
EBX |
The first part of the hypervisor vendor identifier signature. | |
|
ECX |
More of the hypervisor vendor identifier signature. | |
|
EDX |
The final part of the hypervisor vendor identifier signature. | |
If the 0x40000001 leaf is queried, the hypervisor will return a value that identifies the hypervisor interface. The following table provides the detailed return value information.
| Leaf | Hypervisor returns | |
|---|---|---|
|
0x40000001 |
Hypervisor vendor-neutral interface identification, which determines the semantics of leaves from 0x40000002 through 0x400000FF, is returned in the following register. | |
|
EAX |
Hypervisor interface signature. | |
|
EBX |
Reserved. | |
|
ECX |
Reserved. | |
|
EDX |
Reserved. | |
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Build date: 11/16/2013