Re: [PATCH 2/2] cpu: Assert a vCPU is created before resetting it

[Peter Maydell <peter.maydell@linaro.org>]

On Mon, 9 Mar 2020 at 12:11, Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>
> cpu_reset() might modify architecture-specific fields allocated
> by qemu_init_vcpu(). To avoid bugs similar to the one fixed in
> commit 00d0f7cb66 when introducing new architectures, assert a
> vCPU is created before resetting it.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  hw/core/cpu.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/hw/core/cpu.c b/hw/core/cpu.c
> index fe65ca62ac..09e49f8d6a 100644
> --- a/hw/core/cpu.c
> +++ b/hw/core/cpu.c
> @@ -251,6 +251,7 @@ void cpu_reset(CPUState *cpu)
>  {
>      CPUClass *klass = CPU_GET_CLASS(cpu);
>
> +    assert(cpu->created);
>      if (klass->reset != NULL) {
>          (*klass->reset)(cpu);
>      }

This will conflict with the change to use DeviceClass::reset.

Ideally we should do an equivalent assert in the DeviceClass
(and flush out all the bugs where we forgot to realize the
device before using it).

thanks
-- PMM