[PULL,05/16] target/riscv: flush TLB pages if PMP permission has been changed

Commit Message

Alistair Francis March 23, 2021, 1:57 a.m. UTC

From: Jim Shu <[e-mail]>

If PMP permission of any address has been changed by updating PMP entry,
flush all TLB pages to prevent from getting old permission.

Signed-off-by: Jim Shu <[e-mail]>
Reviewed-by: Alistair Francis <[e-mail]>
Message-id: [e-mail]
Signed-off-by: Alistair Francis <[e-mail]>
---
 target/riscv/pmp.c | 4 ++++
 1 file changed, 4 insertions(+)

Patch

diff --git a/target/riscv/pmp.c b/target/riscv/pmp.c
index ebd874cde3..cff020122a 100644
--- a/target/riscv/pmp.c
+++ b/target/riscv/pmp.c
@@ -28,6 +28,7 @@ 
 #include "qapi/error.h"
 #include "cpu.h"
 #include "trace.h"
+#include "exec/exec-all.h"
 
 static void pmp_write_cfg(CPURISCVState *env, uint32_t addr_index,
     uint8_t val);
@@ -347,6 +348,9 @@  void pmpcfg_csr_write(CPURISCVState *env, uint32_t reg_index,
         cfg_val = (val >> 8 * i)  & 0xff;
         pmp_write_cfg(env, (reg_index * 4) + i, cfg_val);
     }
+
+    /* If PMP permission of any addr has been changed, flush TLB pages. */
+    tlb_flush(env_cpu(env));
 }