From: Alistair Francis <alistair.francis@wdc.com>
Date: Sat, 1 Feb 2020 01:02:25 +0000 (-0800)
Subject: target/ricsv: Flush the TLB on virtulisation mode changes
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=eccc5a12c2fd1c646c69a1e7de29183b7a559973;p=qmiga%2Fqemu.git

target/ricsv: Flush the TLB on virtulisation mode changes

To ensure our TLB isn't out-of-date we flush it on all virt mode
changes. Unlike priv mode this isn't saved in the mmu_idx as all
guests share V=1. The easiest option is just to flush on all changes.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
---

diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index ccf67aca05..a8b114ae16 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -181,6 +181,11 @@ void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable)
         return;
     }
 
+    /* Flush the TLB on all virt mode changes. */
+    if (get_field(env->virt, VIRT_ONOFF) != enable) {
+        tlb_flush(env_cpu(env));
+    }
+
     env->virt = set_field(env->virt, VIRT_ONOFF, enable);
 }