This issue mostly occurred when user try v-motion by vc-client  in vmware vsphere6 environment there are two solution.

 

Try Vmotion/svmotion by using Web-Client If it failed then try this method but it is risky.

 

To resolve this issue, reset the CPUID Mask settings on the affected virtual machine.

 

To reset the CPUID Mask settings:

  1. Using the vSphere Client, connect to the vCenter Server and locate the affected virtual machine.
  2. Power off the virtual machine.
  3. Right-click the virtual machine and click Edit Settings > Options > CPUID Mask > Advanced.
  4. Click Reset All to Default to reset the CPUID Mask.
  5. Click OK > OK, then power on the virtual machine.

    The virtual machine now shows the correct EVC mode

If the issue persists, upgrade the virtual machine's virtual hardware to the latest version.