Re: [Xen-devel] [PATCH] Make ballooning work with maxmem > mem (i386 version)

[Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>]

On Fri, Nov 10, 2006 at 03:43:10PM +0000, Keir Fraser wrote:
> On 10/11/06 15:33, "Glauber de Oliveira Costa" <gcosta@xxxxxxxxxx> wrote:
> 
> >> I took both patches and then changed my mind and immediately reverted them.
> >> There is a better way: we should support the XENMEM_memory_map hypercall.
> >> We should provide a hypercall (domctl) to set a memory_map_limit parameter
> >> and then Xen can use that to fake a memory map when XENMEM_memory_map is
> >> called. The tools can set that parameter from config['maxmem'].
> > 
> > And what happens when the hypercall ever returns ENOSYS, like a kernel
> > running in a bit old Hypervisor?
> > 
> > IMHO,If we have to ever fallback into default assumptions, it seems wiser
> > to extend the physicall map to maximum_reservation, not current_reservation.
> 
> Maxmem will in future be fixed to track tot_pages. That was its original
> purpose: to cap what memory the guest is allowed *now*, not to tell it the
> max that it will ever be allowed. 

In this scenario, what's the purpose of current_reservation, as the only
difference from it now, is that it returns tot_pages instead of
max_pages ?

-- 
Glauber de Oliveira Costa
Red Hat Inc.
"Free as in Freedom"

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