From: Jonathan Behrens <jonathan@fintelia.io>
Date: Wed, 8 May 2019 17:38:35 +0000 (-0400)
Subject: target/riscv: Only flush TLB if SATP.ASID changes
X-Git-Tag: v4.1.0-rc0~86^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1e0d985fa9136a563168a3da66f3d17820404ee2;p=thirdparty%2Fqemu.git

target/riscv: Only flush TLB if SATP.ASID changes

There is an analogous change for ARM here:
https://patchwork.kernel.org/patch/10649857

Signed-off-by: Jonathan Behrens <jonathan@fintelia.io>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
---

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 0f51c7eae24..f9e2910643f 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -723,7 +723,9 @@ 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;
         }
     }