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accel/tcg: Use CF_NO_GOTO_{TB, PTR} in cpu_exec_step_atomic 

Request that the one TB returns immediately, so that
we release the exclusive lock as soon as possible.

Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210717221851.2124573-7-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-07-17 15:18:44 -07:00
parent 04f5b647ed
commit 258afb487f
1 changed files with 8 additions and 3 deletions
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11
accel/tcg/cpu-exec.c
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@ -330,8 +330,7 @@ void cpu_exec_step_atomic(CPUState *cpu)
CPUArchState *env = (CPUArchState *)cpu->env_ptr;
TranslationBlock *tb;
target_ulong cs_base, pc;
uint32_t flags;
uint32_t cflags = (curr_cflags(cpu) & ~CF_PARALLEL) | 1;
uint32_t flags, cflags;
int tb_exit;
if (sigsetjmp(cpu->jmp_env, 0) == 0) {
@ -341,8 +340,14 @@ void cpu_exec_step_atomic(CPUState *cpu)
cpu->running = true;
cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
tb = tb_lookup(cpu, pc, cs_base, flags, cflags);
cflags = curr_cflags(cpu);
/* Execute in a serial context. */
cflags &= ~CF_PARALLEL;
/* After 1 insn, return and release the exclusive lock. */
cflags |= CF_NO_GOTO_TB | CF_NO_GOTO_PTR | 1;
tb = tb_lookup(cpu, pc, cs_base, flags, cflags);
if (tb == NULL) {
mmap_lock();
tb = tb_gen_code(cpu, pc, cs_base, flags, cflags);