[xen staging] x86/pv: map and unmap page table in dom0_construct_pv

[patchbot@xxxxxxx]

commit e55884368563eb0d905b08d8bab501b53d612b68
Author:     Wei Liu <wei.liu2@xxxxxxxxxx>
AuthorDate: Tue Apr 28 17:49:17 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Apr 28 17:49:17 2020 +0200

    x86/pv: map and unmap page table in dom0_construct_pv
    
    Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Signed-off-by: Hongyan Xia <hongyxia@xxxxxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/pv/dom0_build.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c
index 5678da782d..abfbe5f436 100644
--- a/xen/arch/x86/pv/dom0_build.c
+++ b/xen/arch/x86/pv/dom0_build.c
@@ -669,6 +669,8 @@ int __init dom0_construct_pv(struct domain *d,
 
     if ( is_pv_32bit_domain(d) )
     {
+        l2_pgentry_t *l2t;
+
         /* Ensure the first four L3 entries are all populated. */
         for ( i = 0, l3tab = l3start; i < 4; ++i, ++l3tab )
         {
@@ -683,7 +685,9 @@ int __init dom0_construct_pv(struct domain *d,
                 l3e_get_page(*l3tab)->u.inuse.type_info |= PGT_pae_xen_l2;
         }
 
-        init_xen_pae_l2_slots(l3e_to_l2e(l3start[3]), d);
+        l2t = map_l2t_from_l3e(l3start[3]);
+        init_xen_pae_l2_slots(l2t, d);
+        unmap_domain_page(l2t);
     }
 
     /* Pages that are part of page tables must be read only. */
--
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