[Qemu-devel] [PULL 49/51] cpu: flush TB cache when loading VMState

[Paolo Bonzini]

From: Pavel Dovgalyuk <address@hidden>

Flushing TB cache is required because TBs key in the cache may match
different code which existed in the previous state.

Signed-off-by: Pavel Dovgalyuk <address@hidden>
Signed-off-by: Maria Klimushenkova <address@hidden>
Message-Id: <address@hidden>
[Add comment suggested by Peter Maydell. - Paolo]
Signed-off-by: Paolo Bonzini <address@hidden>
Signed-off-by: Pavel Dovgalyuk <address@hidden>
---
 exec.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/exec.c b/exec.c
index 9f4f450..d28fc0c 100644
--- a/exec.c
+++ b/exec.c
@@ -623,6 +623,13 @@ static int cpu_common_post_load(void *opaque, int 
version_id)
     cpu->interrupt_request &= ~0x01;
     tlb_flush(cpu);
 
+    /* loadvm has just updated the content of RAM, bypassing the
+     * usual mechanisms that ensure we flush TBs for writes to
+     * memory we've translated code from. So we must flush all TBs,
+     * which will now be stale.
+     */
+    tb_flush(cpu);
+
     return 0;
 }
 
-- 
1.8.3.1