From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
It's the struct page of the L1 pte page. But we can get its mfn
by simply doing an arbitrary_virt_to_machine() on it anyway (which is
the safe conservative choice; since we no longer allow HIGHPTE pages,
we would never expect to be operating on a mapped pte page).
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
drivers/xen/gntdev.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index b916d6b..fc5e420 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -203,8 +203,8 @@ static int find_grant_ptes(pte_t *pte, pgtable_t token,
unsigned long addr, void
u64 pte_maddr;
BUG_ON(pgnr >= map->count);
- pte_maddr = (u64)pfn_to_mfn(page_to_pfn(token)) << PAGE_SHIFT;
- pte_maddr += (unsigned long)pte & ~PAGE_MASK;
+ pte_maddr = arbitrary_virt_to_machine(pte).maddr;
+
gnttab_set_map_op(&map->map_ops[pgnr], pte_maddr,
GNTMAP_contains_pte | map->flags,
map->grants[pgnr].ref,
--
1.5.6.5
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