[Xen-devel] Re: [PATCH 06/11] xen: gntdev: move use of GNTMAP_contains_pte next to the map_op

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 5 Jan 2011, Konrad Rzeszutek Wilk wrote:
> On Wed, Dec 15, 2010 at 01:40:41PM +0000, stefano.stabellini@xxxxxxxxxxxxx 
> wrote:
> > From: Ian Campbell <ian.campbell@xxxxxxxxxx>
> > 
> > This flag controls the meaning of gnttab_map_grant_ref.host_addr and
> > specifies that the field contains a refernce to the pte entry to be
>                                       ^^^^^^^^ - reference

fixed it

> > diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
> > index cf61c7d..b916d6b 100644
> > --- a/drivers/xen/gntdev.c
> > +++ b/drivers/xen/gntdev.c
> > @@ -205,10 +205,12 @@ static int find_grant_ptes(pte_t *pte, pgtable_t 
> > token, unsigned long addr, void
> >     BUG_ON(pgnr >= map->count);
> >     pte_maddr  = (u64)pfn_to_mfn(page_to_pfn(token)) << PAGE_SHIFT;
> >     pte_maddr += (unsigned long)pte & ~PAGE_MASK;
> > -   gnttab_set_map_op(&map->map_ops[pgnr], pte_maddr, map->flags,
> > +   gnttab_set_map_op(&map->map_ops[pgnr], pte_maddr,
> > +                     GNTMAP_contains_pte | map->flags,
> 
> Ok, but the gnttab_set_map_op will do the exact thing it did before. It still 
> does this:
> 
> map->host_addr = addr;
> 
> irregardless if you pass in any flag.
> 

Yes, but the flags are set in map_ops and that is critical because it
changes the meanings of the hypercall arguments.
 

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