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[Xen-devel] [PATCH v2 18/20] xen/mem_access: Use __get_gfn_type_access in set_mem_access

Use __get_gfn_type_access instead of p2m->get_entry to trigger page-forking
when the mem_access permission is being set on a page that has not yet been
copied over from the parent.

Signed-off-by: Tamas K Lengyel <tamas.lengyel@xxxxxxxxx>
 xen/arch/x86/mm/mem_access.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/mm/mem_access.c b/xen/arch/x86/mm/mem_access.c
index 320b9fe621..9caf08a5b2 100644
--- a/xen/arch/x86/mm/mem_access.c
+++ b/xen/arch/x86/mm/mem_access.c
@@ -303,11 +303,10 @@ static int set_mem_access(struct domain *d, struct 
p2m_domain *p2m,
-        mfn_t mfn;
         p2m_access_t _a;
         p2m_type_t t;
-        mfn = p2m->get_entry(p2m, gfn, &t, &_a, 0, NULL, NULL);
+        mfn_t mfn = __get_gfn_type_access(p2m, gfn_x(gfn), &t, &_a,
+                                          P2M_ALLOC, NULL, false);
         rc = p2m->set_entry(p2m, gfn, mfn, PAGE_ORDER_4K, t, a, -1);

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