With PTE entry, high bit 48-63 is valid HW bit for PTE attribute,
for example bit 63 is RPLV and bit 62 is NX. With page directory table,
it is physical address of page table from view of HW, so high bit
48-63 need be discarded.

Here reverve high bit 48-63 with huge page since it is PTE entry, and
only discard it with page directory table.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
---
 target/loongarch/cpu_helper.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/target/loongarch/cpu_helper.c b/target/loongarch/cpu_helper.c
index 8af6ee7fb1..8388bfb782 100644
--- a/target/loongarch/cpu_helper.c
+++ b/target/loongarch/cpu_helper.c
@@ -134,10 +134,13 @@ static TLBRet loongarch_ptw(CPULoongArchState *env, MMUContext *context,
         /* get next level page directory */
         index = (address >> dir_base) & ((1 << dir_width) - 1);
         phys = base | index << 3;
-        base = ldq_phys(cs->as, phys) & TARGET_PHYS_MASK;
+        base = ldq_phys(cs->as, phys);
         if (FIELD_EX64(base, TLBENTRY, HUGE)) {
             /* base is a huge pte */
             break;
+        } else {
+            /* Discard high bits with page directory table */
+            base &= TARGET_PHYS_MASK;
         }
     }
 
-- 
2.43.5