[Xen-changelog] [xen staging] x86/mem_access: use __get_gfn_type_access in set_mem_access

[patchbot@xxxxxxx]

commit 9b71d6a759a6835c7723afa3d79e1e7f10da4396
Author:     Tamas K Lengyel <tamas.lengyel@xxxxxxxxx>
AuthorDate: Wed Jan 29 15:06:50 2020 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jan 29 15:06:50 2020 +0100

    x86/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>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 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 d16540a9aa..ede774fb50 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);
     }
 
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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