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Re: [Xen-devel] [PATCH v3 04/20] xen/grant: Introduce helpers to split a page into grant

On 07/08/15 17:46, Julien Grall wrote:
> Currently, a grant is always based on the Xen page granularity (i.e
> 4KB). When Linux is using a different page granularity, a single page
> will be split between multiple grants.
> The new helpers will be in charge to split the Linux page into grants and
> call a function given by the caller on each grant.
> Also provide an helper to count the number of grants within a given
> contiguous region.
> Note that the x86/include/asm/xen/page.h is now including
> xen/interface/grant_table.h rather than xen/grant_table.h. It's
> necessary because xen/grant_table.h depends on asm/xen/page.h and will
> break the compilation. Furthermore, only definition in
> interface/grant_table.h was required.

Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>


> +/* Helper to get to call fn only on the first "grant chunk" */
> +static inline void gnttab_one_grant(struct page *page, unsigned int offset,
> +                                 unsigned len, xen_grant_fn_t fn,
> +                                 void *data)

...call this gnttab_for_one_grant().


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