[Qemu-devel] [PATCH for 4.1] target/riscv: Only flush TLB if SATP.ASID changes

[Jonathan Behrens]

There is an analogous change for ARM here:
https://patchwork.kernel.org/patch/10649857
---
 target/riscv/csr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 6083c782a1..1ec1222da1 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -732,7 +732,9 @@ static int write_satp(CPURISCVState *env, int csrno,
target_ulong val)
         if (env->priv == PRV_S && get_field(env->mstatus, MSTATUS_TVM)) {
             return -1;
         } else {
-            tlb_flush(CPU(riscv_env_get_cpu(env)));
+            if((val ^ env->satp) & SATP_ASID) {
+                tlb_flush(CPU(riscv_env_get_cpu(env)));
+            }
             env->satp = val;
         }
     }
-- 
2.20.1