Re: [Xen-devel] [PATCH] Extra check in grant table code for mapping of shared frame

[Andres Lagar-Cavilla <andreslc@xxxxxxxxxxxxxx>]

ping…
Thanks,
Andres
On Sep 13, 2012, at 11:27 AM, Andres Lagar-Cavilla wrote:

> xen/common/grant_table.c |  9 ++++++---
> 1 files changed, 6 insertions(+), 3 deletions(-)
> 
> 
> Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
> 
> diff -r 5ce5b53ea68f -r 40b91bed1275 xen/common/grant_table.c
> --- a/xen/common/grant_table.c
> +++ b/xen/common/grant_table.c
> @@ -649,9 +649,12 @@ __gnttab_map_grant_ref(
>     }
>     else if ( owner == rd || owner == dom_cow )
>     {
> -        if ( gnttab_host_mapping_get_page_type(op, ld, rd) &&
> -             !get_page_type(pg, PGT_writable_page) )
> -            goto could_not_pin;
> +        if ( gnttab_host_mapping_get_page_type(op, ld, rd) )
> +        {
> +            if ( (owner == dom_cow) ||
> +                 !get_page_type(pg, PGT_writable_page) )
> +                goto could_not_pin;
> +        }
> 
>         nr_gets++;
>         if ( op->flags & GNTMAP_host_map )


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