On 03/10/2015 12:47 PM, Paolo Bonzini wrote:
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.
My bitcoins are on 5-level page tables. HIGHMEM is too much pain.
50 bits == 1 PiB. That's quite an amount of RAM.
Not that 64 TiB is not "quite an amount of RAM". :)
Depends on how many browser tabs you have open, I guess.
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