Re: [Xen-devel] [PATCH] x86/xen: Do not clip xen_e820_map to xen_e820_map_entries when sanitizing map

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 09/28/2015 06:36 AM, Malcolm Crossley wrote:
> Sanitizing the e820 map may produce extra E820 entries which would result in
> the topmost E820 entries being removed. The removed entries would typically
> include the top E820 usable RAM region and thus result in the domain having
> signicantly less RAM available to it.
>
> Fix by allowing sanitize_e820_map to use the full size of the allocated E820
> array.
>
> Signed-off-by: Malcolm Crossley <malcolm.crossley@xxxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

> ---
>   arch/x86/xen/setup.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
> index f5ef674..415a55f 100644
> --- a/arch/x86/xen/setup.c
> +++ b/arch/x86/xen/setup.c
> @@ -798,7 +798,7 @@ char * __init xen_memory_setup(void)
>                 xen_ignore_unusable();
>   
>   	/* Make sure the Xen-supplied memory map is well-ordered. */
> -       sanitize_e820_map(xen_e820_map, xen_e820_map_entries,
> +       sanitize_e820_map(xen_e820_map, ARRAY_SIZE(xen_e820_map),
>                           &xen_e820_map_entries);
>   
>   	max_pages = xen_get_max_pages();

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