2 ms·
The Intel manuals list the set of features that are removed or planned to be removed from newer hardware versions: Sub-page write permissions for EPT, xAPIC mod
by jcranmer 5mo ago
The Intel manuals list the set of features that are removed or planned to be removed from newer hardware versions: Sub-page write permissions for EPT, xAPIC mode, Key Locker, Uncore PMI. IA32_DEBUGCTL MSR, bit 13 (MSR address 1D9H), Intel® Memory Protection Extensions (Intel® MPX), MSR_TEST_CTRL, bit 31 (MSR address 33H), Hardware Lock Elision (HLE), VP2INTERSECT. AMD's manuals suggests that they view the ISA as purely additive, but I haven't read them in detail.
Basically, outside of MPX, and the confusing lineage of AVX-512 on client versus server parts, x86 is pretty strictly additive.