Which processors support "VMX Preemption Timer"?

[superymk]

I've read the related part in the manual and I feel that all VT-x enabled processors support this feature. However, I test it on my Duo Core T2300 and it doesn't support this.
So which processors support this feature? I noticed that only KVM use this feature since 2008-12.

[David_O_Intel1 · Accepted solution]

This feature first appeared with Intel Core i7 processors.

To verify Preemption Timer capability, youcan read bit 38 (1-setting) of the IA32_VMX_PROCBASED_CTLS (index 0x481) MSR. If bit 38 is '0' - Preemption Timer is not available on the corresponding processor.

David Ott