Re: [Xen-devel] [PATCH v3 04/20] xen/grant: Introduce helpers to split a page into grant
From: David Vrabel
Date: Thu Aug 20 2015 - 05:51:58 EST
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>
But...
> +/* 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().
David
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