Merge tag 'pull-loongarch-20230515' of https://gitlab.com/gaosong/qemu into staging

pull-loongarch-20230515

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* tag 'pull-loongarch-20230515' of https://gitlab.com/gaosong/qemu

:
  hw/intc: Add NULL pointer check on LoongArch ipi device
  hw/loongarch/virt: Set max 256 cpus support on loongarch virt machine
  hw/loongarch/virt: Modify ipi as percpu device
  tests/avocado: Add LoongArch machine start test
  loongarch: mark loongarch_ipi_iocsr re-entrnacy safe

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>