From: Jim Shu <cwshu@andestech.com>
Date: Sun, 21 Feb 2021 14:01:22 +0000 (+0800)
Subject: target/riscv: flush TLB pages if PMP permission has been changed
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2c2e0f2842520bcd25472285cfce39696e52e662;p=qemu.git

target/riscv: flush TLB pages if PMP permission has been changed

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 <cwshu@andestech.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 1613916082-19528-4-git-send-email-cwshu@andestech.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---

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));
 }