Re: [Xen-devel] [PATCH V13 2/7] xen/arm: Implement domain_get_maximum_gpfn

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 6 Mar 2015, Tamas K Lengyel wrote:
> From: Julien Grall <julien.grall@xxxxxxxxxx>
> 
> The function domain_get_maximum_gpfn is returning the maximum gpfn ever
> mapped in the guest. We can use d->arch.p2m.max_mapped_gfn for this purpose.
> 
> We use this in xenaccess as to avoid the user attempting to set page
> permissions on pages which don't exist for the domain, as a non-arch specific
> sanity check.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>

Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>


>  xen/arch/arm/mm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
> index 7d4ba0c..ca0aa69 100644
> --- a/xen/arch/arm/mm.c
> +++ b/xen/arch/arm/mm.c
> @@ -985,7 +985,7 @@ int page_is_ram_type(unsigned long mfn, unsigned long 
> mem_type)
>  
>  unsigned long domain_get_maximum_gpfn(struct domain *d)
>  {
> -    return -ENOSYS;
> +    return d->arch.p2m.max_mapped_gfn;
>  }
>  
>  void share_xen_page_with_guest(struct page_info *page,
> -- 
> 2.1.4
> 

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