Re: [Xen-devel] [RFC 2/2] xen/public: grant-table: Specificy the size of the grant

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 5 Aug 2015, Julien Grall wrote:
> The grant is always 4KB irrespectively of the page granularity of the
> guest.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> ---
> 
> Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Keir Fraser <keir@xxxxxxx>
> Cc: Tim Deegan <tim@xxxxxxx>
> ---
>  xen/include/public/grant_table.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/xen/include/public/grant_table.h 
> b/xen/include/public/grant_table.h
> index e9393fd..67a250d 100644
> --- a/xen/include/public/grant_table.h
> +++ b/xen/include/public/grant_table.h
> @@ -51,6 +51,11 @@
>   * know the real machine address of a page it is sharing. This makes
>   * it possible to share memory correctly with domains running in
>   * fully virtualised memory.
> + *
> + * The size of a grant is always 4KB irrespectively of the page
> + * granularity of the guest. This is means that when the guest is using
                                      ^ no is

> + * 64KB page granularity, it will have to split the page in 4KB chunks
> + * and request a grant for every of them.
                              ^ each

>   */
>  
>  /***********************************
> -- 
> 2.1.4
> 

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