Re: [Xen-devel] [PATCH] ioemu: directly project all memory on x86_64

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Wed, Jan 23, 2008 at 05:54:40PM +0000, Keir Fraser wrote:
> On 23/1/08 16:38, "Samuel Thibault" <samuel.thibault@xxxxxxxxxxxxx> wrote:
> 
> > Keir Fraser, le Wed 23 Jan 2008 16:30:27 +0000, a écrit :
> >> I don't really want the memory-size parameter back. What if we support
> >> memory hotplug in future (e.g., we could do now if the guest decides to
> >> balloon in some memory higher up in its memory map)?
> > 
> > Well, the question holds for ia64 too, which already projects all
> > memory.
> 
> Sure. I expect ia64 lags behind x86 in this respect.

IA64 doesn't support HVM domain balloon yet.
Presumably the first step for ia64 suport is to switch from direct
mapping to mapcache (with 1:1 hash?) and see if perfromance degration
is acceptable. But no one hasn't tried it yet.

Anyway on ia64 memory might not be populated continuously,
so some kind of tracking allocate/unallocate memory in qemu-dm
is necessary in long term.

-- 
yamahata

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