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| author | Paolo Bonzini <pbonzini@redhat.com> | 2015-08-18 06:34:19 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-09-09 15:34:53 +0200 |
| commit | ab096a75cd626dcd4ad34b2a11652df0269bee0d (patch) | |
| tree | c4fe850ffe472f0bee61c7c2a792a1d6e026f4a1 /cpu-exec.c | |
| parent | b0a46fa796504c7334202877a68c857e49f7c96c (diff) | |
tcg: synchronize cpu->exit_request and cpu->tcg_exit_req accesses
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'cpu-exec.c')
| -rw-r--r-- | cpu-exec.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/cpu-exec.c b/cpu-exec.c index 567ae8bda1..e24c640013 100644 --- a/cpu-exec.c +++ b/cpu-exec.c @@ -507,8 +507,12 @@ int cpu_exec(CPUState *cpu) * loop. Whatever requested the exit will also * have set something else (eg exit_request or * interrupt_request) which we will handle - * next time around the loop. + * next time around the loop. But we need to + * ensure the tcg_exit_req read in generated code + * comes before the next read of cpu->exit_request + * or cpu->interrupt_request. */ + smp_rmb(); next_tb = 0; break; case TB_EXIT_ICOUNT_EXPIRED: |