diff mbox series

[v5,16/18] xen/mem_access: Use __get_gfn_type_access in set_mem_access

Message ID ccfe688a5604ab5d547562c7e7d7f787418bef43.1579628566.git.tamas.lengyel@intel.com (mailing list archive)
State Superseded
Headers show
Series VM forking | expand

Commit Message

Tamas K Lengyel Jan. 21, 2020, 5:49 p.m. UTC 
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@intel.com>
---
 xen/arch/x86/mm/mem_access.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
diff mbox series

Patch

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,
     ASSERT(!ap2m);
 #endif
     {
-        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);
     }