[Xen-devel] [PATCH 4/5] x86_64/mm: map and unmap page tables in destroy_compat_m2p_mapping

[Hongyan Xia <hx242@xxxxxxx>]

From: Wei Liu <wei.liu2@xxxxxxxxxx>

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Reviewed-by: Hongyan Xia <hongyxia@xxxxxxxxxx>
---
 xen/arch/x86/x86_64/mm.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index 2680173fab..71c84ac593 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -235,11 +235,13 @@ static void destroy_compat_m2p_mapping(struct 
mem_hotadd_info *info)
     if ( emap > ((RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START) >> 2) 
)
         emap = (RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START) >> 2;
 
-    l3_ro_mpt = 
l4e_to_l3e(idle_pg_table[l4_table_offset(HIRO_COMPAT_MPT_VIRT_START)]);
+    l3_ro_mpt = map_l3t_from_l4e(idle_pg_table[
+                    l4_table_offset(HIRO_COMPAT_MPT_VIRT_START)]);
 
     
ASSERT(l3e_get_flags(l3_ro_mpt[l3_table_offset(HIRO_COMPAT_MPT_VIRT_START)]) & 
_PAGE_PRESENT);
 
-    l2_ro_mpt = 
l3e_to_l2e(l3_ro_mpt[l3_table_offset(HIRO_COMPAT_MPT_VIRT_START)]);
+    l2_ro_mpt = map_l2t_from_l3e(
+                    l3_ro_mpt[l3_table_offset(HIRO_COMPAT_MPT_VIRT_START)]);
 
     for ( i = smap; i < emap; )
     {
@@ -261,6 +263,9 @@ static void destroy_compat_m2p_mapping(struct 
mem_hotadd_info *info)
         i += 1UL << (L2_PAGETABLE_SHIFT - 2);
     }
 
+    UNMAP_DOMAIN_PAGE(l2_ro_mpt);
+    UNMAP_DOMAIN_PAGE(l3_ro_mpt);
+
     return;
 }
 
-- 
2.24.1.AMZN


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