[PATCH v2 1/5] target/riscv: Check PMP rules num before propagation

[LIU Zhiwei]

When an address is in [0-4K) and no pmp rule configured, the tlb_size will
be set to 1.

This is caused by pmp_get_tlb_size return a value 1.

if (pmp_sa >= tlb_sa && pmp_ea <= tlb_ea) {
    return pmp_ea - pmp_sa + 1;
}

Here pmp_sa == 0 and pmp_ea == 0.

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
---
 target/riscv/pmp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/target/riscv/pmp.c b/target/riscv/pmp.c
index 54abf42583..190ff59fab 100644
--- a/target/riscv/pmp.c
+++ b/target/riscv/pmp.c
@@ -627,6 +627,10 @@ bool pmp_is_range_in_tlb(CPURISCVState *env, hwaddr tlb_sa,
     target_ulong val;
     target_ulong tlb_ea = (tlb_sa + TARGET_PAGE_SIZE - 1);
 
+    if (pmp_get_num_rules(env) == 0) {
+        return false;
+    }
+
     for (i = 0; i < MAX_RISCV_PMPS; i++) {
         val = pmp_get_tlb_size(env, i, tlb_sa, tlb_ea);
         if (val) {
-- 
2.25.1