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| author | Richard Henderson <richard.henderson@linaro.org> | 2020-08-05 16:06:26 -0700 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2020-09-03 13:13:58 -0700 |
| commit | 4ca3d09cd9b2046984966ef430cca4572ae0a925 (patch) | |
| tree | f276bd1088a74e1b1c1a6d016d7fb69e9449e560 /softmmu | |
| parent | e7e8f33fb603c3bfa0479d7d924f2ad676a84317 (diff) | |
| download | qemu-4ca3d09cd9b2046984966ef430cca4572ae0a925.zip qemu-4ca3d09cd9b2046984966ef430cca4572ae0a925.tar.gz qemu-4ca3d09cd9b2046984966ef430cca4572ae0a925.tar.bz2 | |
softmmu/cpus: Only set parallel_cpus for SMP
Do not set parallel_cpus if there is only one cpu instantiated.
This will allow tcg to use serial code to implement atomics.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'softmmu')
| -rw-r--r-- | softmmu/cpus.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/softmmu/cpus.c b/softmmu/cpus.c index a802e89..e3b9806 100644 --- a/softmmu/cpus.c +++ b/softmmu/cpus.c @@ -1895,6 +1895,16 @@ static void qemu_tcg_init_vcpu(CPUState *cpu) if (!tcg_region_inited) { tcg_region_inited = 1; tcg_region_init(); + /* + * If MTTCG, and we will create multiple cpus, + * then we will have cpus running in parallel. + */ + if (qemu_tcg_mttcg_enabled()) { + MachineState *ms = MACHINE(qdev_get_machine()); + if (ms->smp.max_cpus > 1) { + parallel_cpus = true; + } + } } if (qemu_tcg_mttcg_enabled() || !single_tcg_cpu_thread) { @@ -1904,7 +1914,6 @@ static void qemu_tcg_init_vcpu(CPUState *cpu) if (qemu_tcg_mttcg_enabled()) { /* create a thread per vCPU with TCG (MTTCG) */ - parallel_cpus = true; snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG", cpu->cpu_index); |