[Xen-devel] Converting heap page_infos to contiguous virtual

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

I would like to clear a bunch of Xen heap pages at once (i.e. not
page-by-page).

Greatly simplifying things, let's say I grab (in common/page_alloc.c)
    pg = page_list_remove_head(&heap(node, zone, order)

and then

    mfn_t mfn =
_mfn(page_to_mfn(pg));                                        
    char *va = mfn_to_virt(mfn_x(mfn));
    memset(va, 0, 4096 * (1 << order));


Would it be valid to this? Do I need to account for the PDX hole?


Thanks.
-boris





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