RE: [Xen-devel] Xen + other stuff?

["Barry Silverman" <barry@xxxxxxxxx>]

Is this a hugh think to support in
1) the hypervisor?
2) domain 0 control functions?

Does the hyper visor support PAE today?

If the hypervisor did, then even if the domain 0 didn't support PAE, (and
but the non-0 guest domain did), shouldn't domain 0 be able to construct and
initialize the necessary page mappings on behalf of the guest, and then
allow the hypervisor to actually stuff them into the hardware?

-----Original Message-----
From: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx]On Behalf Of Bin Ren
Sent: Thursday, November 13, 2003 4:03 PM
To: Devel Xen
Subject: Re: [Xen-devel] Xen + other stuff?


On 13 Nov 2003, at 20:26, Keir Fraser wrote:

> With CONFIG_HIGHMEM, Linux no longer needs a permanent mapping for
> every page it owns. Pages in high memory can be temporarily mapped in
> (just as the domain builder does in user space). We'll port this
> config option real soon now, and that will mean that every Xenolinux
> instance could be allocated anything up to 4GB.
>
>  -- Keir


To add, currently there are two modes of High Memory support:

(1)4G: It uses 2 level page table entry + dynamic mapping so that
each (Xeno)Linux instance can use anything up to 4G of physical
memory.

(2)64G: It uses 3 level PAE page table entry + dynamic mapping
so that each (Xeno)Linux instance can use anything up to 64G
of physical memory.


-- Bin



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