[Xen-devel] [PATCH v2 2/3] xen/arm: update page table walk to handle 4 level page table

[vijay.kilari@xxxxxxxxx]

From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>

ARM64 supports 4-level page tables. Update page
table walk function to handle 4 levels

Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
---
 xen/arch/arm/mm.c |   19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 04e3182..ef3c53e 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -162,13 +162,25 @@ static inline void 
check_memory_layout_alignment_constraints(void) {
 #endif
 }
 
-void dump_pt_walk(lpae_t *first, paddr_t addr)
+void dump_pt_walk(lpae_t *root, paddr_t addr)
 {
     lpae_t *second = NULL, *third = NULL;
+    lpae_t *first = NULL;
+#ifdef CONFIG_ARM_64
+    if ( zeroeth_table_offset(addr) >= LPAE_ENTRIES )
+        return;
 
+    printk("0TH[0x%x] = 0x%"PRIpaddr"\n", zeroeth_table_offset(addr),
+           root[zeroeth_table_offset(addr)].bits);
+    if ( !root[zeroeth_table_offset(addr)].walk.valid )
+        goto done;
+
+    first = map_domain_page(root[zeroeth_table_offset(addr)].walk.base);
+#else
+    first = root;
     if ( first_table_offset(addr) >= LPAE_ENTRIES )
         return;
-
+#endif
     printk("1ST[0x%x] = 0x%"PRIpaddr"\n", first_table_offset(addr),
            first[first_table_offset(addr)].bits);
     if ( !first[first_table_offset(addr)].walk.valid ||
@@ -189,6 +201,9 @@ void dump_pt_walk(lpae_t *first, paddr_t addr)
 done:
     if (third) unmap_domain_page(third);
     if (second) unmap_domain_page(second);
+#ifdef CONFIG_ARM_64
+    if ( first ) unmap_domain_page(first);
+#endif
 
 }
 
-- 
1.7.9.5


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