[xen staging] x86_64/mm: map and unmap page tables in cleanup_frame_table

[patchbot@xxxxxxx]

commit 93414e42c75a37b67a4c347f55b2d21d939b576c
Author:     Wei Liu <wei.liu2@xxxxxxxxxx>
AuthorDate: Tue Apr 28 17:46:29 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Apr 28 17:46:29 2020 +0200

    x86_64/mm: map and unmap page tables in cleanup_frame_table
    
    Also fix a weird indentation and use PAGE_{MASK,SIZE} there.
    
    Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Signed-off-by: Hongyan Xia <hongyxia@xxxxxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/x86_64/mm.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index e85ef449f3..cc7bd12d63 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -737,8 +737,8 @@ static void cleanup_frame_table(struct mem_hotadd_info 
*info)
 
     while (sva < eva)
     {
-        l3e = l4e_to_l3e(idle_pg_table[l4_table_offset(sva)])[
-          l3_table_offset(sva)];
+        l3e = l3e_from_l4e(idle_pg_table[l4_table_offset(sva)],
+                           l3_table_offset(sva));
         if ( !(l3e_get_flags(l3e) & _PAGE_PRESENT) ||
              (l3e_get_flags(l3e) & _PAGE_PSE) )
         {
@@ -747,7 +747,7 @@ static void cleanup_frame_table(struct mem_hotadd_info 
*info)
             continue;
         }
 
-        l2e = l3e_to_l2e(l3e)[l2_table_offset(sva)];
+        l2e = l2e_from_l3e(l3e, l2_table_offset(sva));
         ASSERT(l2e_get_flags(l2e) & _PAGE_PRESENT);
 
         if ( (l2e_get_flags(l2e) & (_PAGE_PRESENT | _PAGE_PSE)) ==
@@ -763,10 +763,10 @@ static void cleanup_frame_table(struct mem_hotadd_info 
*info)
             continue;
         }
 
-        ASSERT(l1e_get_flags(l2e_to_l1e(l2e)[l1_table_offset(sva)]) &
-                _PAGE_PRESENT);
-         sva = (sva & ~((1UL << PAGE_SHIFT) - 1)) +
-                    (1UL << PAGE_SHIFT);
+        ASSERT(l1e_get_flags(l1e_from_l2e(l2e, l1_table_offset(sva))) &
+               _PAGE_PRESENT);
+
+        sva = (sva & PAGE_MASK) + PAGE_SIZE;
     }
 
     /* Brute-Force flush all TLB */
--
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