VMware vmotion fails with CPU of host incompatible

Unable to migrate from to : The CPU of the host is incompatible with the CPU feature requirements of the virtual machine; problem detected at CPUID level.

or

Host CPU is incompatible with the virtual machine's requirements at cupid level 0x1 register'ecx'
Host bits: 0000:0100:0000:1000:0010:0010:0000:0001
Required: 1000:0100:0000:100x:xxx0:0x1x:xxx0:x001
Mismatch detected for these features:
*General incompatibilities; refer to KB article 1993 for possible solutions.

Try this:

1. Power down the virtual machine.
2. Click the link to Edit Settings of the virtual machine.
3. Click the Options tab.
4. Select CPUID Mask under Advanced.
5. Click Advanced.
6. Click Reset All to Default.
7. Click OK.
8. Click OK again.
9. Power on the virtual machine and migrate.