On 09/03/2015 20:49, Avi Kivity wrote:
>>>
>> Yes, and it checked that MAXPHYADDR != 52 before.  If you want to set
>> only one bit, making that bit 51 makes sense anyway for simplicity, so
>> it is still 99.9% academic.  Once processors appear with MAXPHYADDR =
>> 52, the remaining 0.1% will become more relevant.
>>
>> The current limit is IIRC 46 or 48 (on Haswell Xeons).
> 
> It will be interesting to have processors with 52 bits of physical
> address and 48 bits of virtual address. HIGHMEM for x86_64?  Or 5-level
> page tables?

I wonder why Intel chose exactly 52...  HIGHMEM seems more likely than
5-level page tables.  Certainly it wouldn't need hacks like Ingo's 4G-4G.

> 50 bits == 1 PiB.  That's quite an amount of RAM.

Not that 64 TiB is not "quite an amount of RAM". :)

Paolo
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