Re: [PATCH v6 4/8] ppc/e500: Use start-powered-off CPUState property

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 8/22/20 10:59 AM, Cédric Le Goater wrote:
> Hello,
> 
> On 8/19/20 6:43 PM, Thiago Jung Bauermann wrote:
>> Instead of setting CPUState::halted to 1 in ppce500_cpu_reset_sec(), use
>> the start-powered-off property which makes cpu_common_reset() initialize it
>> to 1 in common code.
>>
>> Also change creation of CPU object from cpu_create() to object_new() and
>> qdev_realize_and_unref() because cpu_create() realizes the CPU and it's not
>> possible to set a property after the object is realized.
>>
>> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>> Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> 
> 
> This is breaking make check : 
> 
>     tests/qtest/libqtest.c:175: kill_qemu() detected QEMU death from signal 11 (Segmentation fault) (core dumped)
>     ERROR boot-serial-test - too few tests run (expected 7, got 0)
>     make: *** [/home/legoater/work/qemu/qemu-powernv-5.2.git/tests/Makefile.include:650: check-qtest-ppc64] Error 1
>     make: *** Waiting for unfinished jobs....
>     
>     
>     gdb --args build/ppc64-softmmu/qemu-system-ppc64  -display none   -M ppce500
>     ...
>     Thread 1 "qemu-system-ppc" received signal SIGSEGV, Segmentation fault.
>     0x000055555596ebf2 in ppce500_init (machine=0x5555567aa6e0)
>         at /home/legoater/work/qemu/qemu-powernv-5.2.git/hw/ppc/e500.c:880
>     880	        irqs[i].irq[OPENPIC_OUTPUT_INT] = input[PPCE500_INPUT_INT];
>  
>     
>     AFAIUI, 'input is not initialized since the CPU is not yet realized.

Thiago, see ad938fc1d53 ("hw/arm/palm.c: Encapsulate misc GPIO handling
in a device") and eventually f8a865d36dc ("hw/arm/allwinner-a10:
Simplify by passing IRQs with qdev_pass_gpios") to get an idea how you
can fix that.

> 
>     C.
> 
>> ---
>>  hw/ppc/e500.c | 14 ++++++++++----
>>  1 file changed, 10 insertions(+), 4 deletions(-)
>>
>> diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
>> index ab9884e315..d7b803ef26 100644
>> --- a/hw/ppc/e500.c
>> +++ b/hw/ppc/e500.c
>> @@ -704,9 +704,6 @@ static void ppce500_cpu_reset_sec(void *opaque)
>>
>>      cpu_reset(cs);
>>
>> -    /* Secondary CPU starts in halted state for now. Needs to change when
>> -       implementing non-kernel boot. */
>> -    cs->halted = 1;
>>      cs->exception_index = EXCP_HLT;
>>  }
>>
>> @@ -865,7 +862,7 @@ void ppce500_init(MachineState *machine)
>>          CPUState *cs;
>>          qemu_irq *input;
>>
>> -        cpu = POWERPC_CPU(cpu_create(machine->cpu_type));
>> +        cpu = POWERPC_CPU(object_new(machine->cpu_type));
>>          env = &cpu->env;
>>          cs = CPU(cpu);
>>
>> @@ -897,7 +894,16 @@ void ppce500_init(MachineState *machine)
>>          } else {
>>              /* Secondary CPUs */
>>              qemu_register_reset(ppce500_cpu_reset_sec, cpu);
>> +
>> +            /*
>> +             * Secondary CPU starts in halted state for now. Needs to change
>> +             * when implementing non-kernel boot.
>> +             */
>> +            object_property_set_bool(OBJECT(cs), "start-powered-off", true,
>> +                                     &error_fatal);
>>          }
>> +
>> +        qdev_realize_and_unref(DEVICE(cs), NULL, &error_fatal);
>>      }
>>
>>      env = firstenv;
>>
>