[PATCH] xen/arm: mmu: avoid transient mapping of page tables when a directmap is available

[mixx86 <gabi.qs.mail@xxxxxxxxx>]

---
 xen/arch/arm/mmu/pt.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/mmu/pt.c b/xen/arch/arm/mmu/pt.c
index 621b47d..735847e 100644
--- a/xen/arch/arm/mmu/pt.c
+++ b/xen/arch/arm/mmu/pt.c
@@ -42,7 +42,11 @@ static lpae_t *xen_map_table(mfn_t mfn)
     if ( system_state == SYS_STATE_early_boot )
         return pmap_map(mfn);
 
+#if defined(CONFIG_ARM_64)
+    return __va((mfn_to_maddr(mfn)));
+#else
     return map_domain_page(mfn);
+#endif
 }
 
 static void xen_unmap_table(const lpae_t *table)
@@ -52,9 +56,14 @@ static void xen_unmap_table(const lpae_t *table)
      * but the PMAP.
      */
     if ( system_state == SYS_STATE_early_boot )
+    {
         pmap_unmap(table);
-    else
-        unmap_domain_page(table);
+        return;
+    }
+
+#if !defined(CONFIG_ARM_64)
+    unmap_domain_page(table);
+#endif
 }
 
 void dump_pt_walk(paddr_t ttbr, paddr_t addr,
-- 
2.54.0