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tcg: update the cpu running flag in cpu_exec_step_atomic 

The cpu_exec_step_atomic() function is called with the cpu->running
clear and proceeds to run target code without setting this flag. If
this target code generates an exception then handle_cpu_signal() will
unnecessarily abort.  For example if atomic code generates a memory
protection fault.

This patch at least sets and clears this running flag, and adds some
assertions to help detect other cases.

Signed-off-by: Douglas Crosher <dtc-ubuntu@scieneer.com>
Message-Id: <a272c656-f7c5-019d-1cc0-499b8f80f2fc@scieneer.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Douglas Crosher 2020-09-22 17:42:41 +10:00 committed by Richard Henderson
parent 0e32462630
commit bfff072c50
1 changed files with 4 additions and 0 deletions
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4
accel/tcg/cpu-exec.c
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@ -285,6 +285,9 @@ void cpu_exec_step_atomic(CPUState *cpu)
if (sigsetjmp(cpu->jmp_env, 0) == 0) {
start_exclusive();
g_assert(cpu == current_cpu);
g_assert(!cpu->running);
cpu->running = true;
tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags, cf_mask);
if (tb == NULL) {
@ -323,6 +326,7 @@ void cpu_exec_step_atomic(CPUState *cpu)
*/
g_assert(cpu_in_exclusive_context(cpu));
parallel_cpus = true;
cpu->running = false;
end_exclusive();
}