Re: [PATCH v2 8/9] xen/gntdev: Implement dma-buf import functionality

[Oleksandr Andrushchenko]

On 06/05/2018 01:28 AM, Boris Ostrovsky wrote:
> On 06/01/2018 07:41 AM, Oleksandr Andrushchenko wrote:
> >   /* ------------------------------------------------------------------ */
> >   
> > +static int
> > +dmabuf_imp_grant_foreign_access(struct page **pages, u32 *refs,
> > +				int count, int domid)
> > +{
> > +	grant_ref_t priv_gref_head;
> > +	int i, ret;
> > +
> > +	ret = gnttab_alloc_grant_references(count, &priv_gref_head);
> > +	if (ret < 0) {
> > +		pr_err("Cannot allocate grant references, ret %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	for (i = 0; i < count; i++) {
> > +		int cur_ref;
> > +
> > +		cur_ref = gnttab_claim_grant_reference(&priv_gref_head);
> > +		if (cur_ref < 0) {
> > +			ret = cur_ref;
> > +			pr_err("Cannot claim grant reference, ret %d\n", ret);
> > +			goto out;
> > +		}
> > +
> > +		gnttab_grant_foreign_access_ref(cur_ref, domid,
> > +						xen_page_to_gfn(pages[i]), 0);
> > +		refs[i] = cur_ref;
> > +	}
> > +
> > +	ret = 0;
> return 0?
My bad, thank you
> > +
> > +out:
> > +	gnttab_free_grant_references(priv_gref_head);
> > +	return ret;
> > +}
> > +