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[Qemu-devel] [PATCH] replay: check icount in cpu exec loop
From: |
Pavel Dovgalyuk |
Subject: |
[Qemu-devel] [PATCH] replay: check icount in cpu exec loop |
Date: |
Tue, 7 Feb 2017 09:50:30 +0300 |
This patch adds check to break cpu loop when icount expires without
setting the TB_EXIT_ICOUNT_EXPIRED flag. It happens when there is no
available translated blocks and all instructions were executed.
In icount replay mode unnecessary tb_find will be called (which may
cause an exception) and execution will be non-deterministic.
This patch should be applied over Paolo's series:
https://www.mail-archive.com/address@hidden/msg426058.html
Signed-off-by: Pavel Dovgalyuk <address@hidden>
---
cpu-exec.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/cpu-exec.c b/cpu-exec.c
index 3838eb8..5cef8bc 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -519,7 +519,8 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
}
/* Finally, check if we need to exit to the main loop. */
- if (unlikely(atomic_read(&cpu->exit_request) || replay_has_interrupt())) {
+ if (unlikely(atomic_read(&cpu->exit_request)
+ || (use_icount && cpu->icount_decr.u16.low + cpu->icount_extra == 0)))
{
atomic_set(&cpu->exit_request, 0);
cpu->exception_index = EXCP_INTERRUPT;
return true;
--
2.8.1
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