On 23/10/2017 12:16, Gerd Hoffmann wrote:
On Mon, 2017-10-23 at 11:46 +0300, Marcel Apfelbaum wrote:
On 23/10/2017 8:45, Gerd Hoffmann wrote:
Hi,
The guest will still run with 40 bits physical!
(judging the code anyway, I hope I am wrong)
Then, the stakes are not so big, the Guest kernel will disregard
the 64bit hole since is not CPU addressable and go on.
But then there is no working 64bit hole for hotplug ...
Hosts with old CPUs are not fit for modern PCIe devices
having large BARs anyway, no 64bit hole in this case would
be OK, I think.
Well, my workstation which has only 39 bits physical is kaby lake.
If you classify this as "old cpu", what is a new cpu then?
Maybe the term "old" was not the best ..., server CPU
intended for bigger hosts with a lot of RAM?
Anyway, having a 32G PCI hotplug window for Q35 should be OK,
for now.
Thanks,
Marcel
cheers,
Gerd
