[Cryptography] Speculation re Intel HW cockup; reqs. OS rewrites & slow execution

[jamesd at echeque.com]

On 1/5/2018 8:23 AM, Henry Baker wrote:
> At 01:32 PM 1/4/2018, jamesd at echeque.com wrote:
>> The fix is not to abandon speculative execution, but to do it right, and chances are that doing it right is going to be faster and more efficient, not slower and less efficient.
> 
> OK, I'll bite.
> 
> How would you do speculative execution "right" ?

All speculative effects would be copy on write.  Same principle as is 
used in vm snapshotting.

If the copy on write buffer overflows, we pause to backup to a lower 
caching level.