Re: [Xen-devel] Re: [PATCH] make ballooning up to maxmem work

[Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>]

On Wed, Nov 22, 2006 at 11:18:39AM +0000, Keir Fraser wrote:
> 
> 
> 
> On 22/11/06 10:40, "Glauber de Oliveira Costa" <gcosta@xxxxxxxxxx> wrote:
> 
> >>      case XENMEM_current_reservation:
> >>      case XENMEM_maximum_reservation:
> >> +    case XENMEM_maximum_memory:
> >>          if ( copy_from_guest(&domid, arg, 1) )
> >>              return -EFAULT;
> > 
> > This still makes use of d->max_pages in return. Isn't it supposed to
> > change in the future too? IIRC, according to Keir, max_pages will track
> > the _current_ number of pages, differing from tot_pages only in a brief
> > timeframe in which you balloon, but tot_pages was not yet updated.
> 
> This adds a level of indirection at least, but really we may as well
> implement the XENMEM_memory_map hypercall. Then there is no guest
> modification required.

We may need guest modifications anyway, since currently no actions are
performed if the memory_map call does not return ENOSYS. 
 

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

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