Re: [Xen-devel] [PATCH 2 of 2] Added a hook for clearing ptes when a vma is freed by the kernel. Adapted from gntdev

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

Hi.

On Tue, May 22, 2007 at 07:17:56AM -0700, Geoffrey Lefebvre wrote:
> +static pte_t blktap_clear_pte(struct vm_area_struct *vma,
> +                           unsigned long uvaddr,
> +                           pte_t *ptep, int is_fullmm)
   [ snip ]
> +     if (khandle->user != INVALID_GRANT_HANDLE) {
> +
> +             BUG_ON(xen_feature(XENFEAT_auto_translated_physmap));
> +
> +             gnttab_set_unmap_op(&unmap[count], virt_to_machine(ptep), 
> +                                 GNTMAP_host_map 
> +                                 | GNTMAP_application_map 
> +                                 | GNTMAP_contains_pte,
> +                                 khandle->user);
> +             count++;
> +     }

'else pte_clear_full(...)' is necessary like gntdev for 
auto translated physmap mode.

-- 
yamahata

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