[v2] Generalize start-powered-off property from ARM

[PATCH v2 5/9] mips/cps: Use start-powered-off CPUState property

Posted by Thiago Jung Bauermann 5 years, 3 months ago

Instead of setting CPUState::halted to 1 in main_cpu_reset(), use the
start-powered-off property which makes cpu_common_reset() initialize it
to 1 in common code.

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 hw/mips/cps.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

NB: I was only able to test that this patch builds. I wasn't able to
run it.

diff --git a/hw/mips/cps.c b/hw/mips/cps.c
index 615e1a1ad2..d5b6c78019 100644
--- a/hw/mips/cps.c
+++ b/hw/mips/cps.c
@@ -52,9 +52,6 @@ static void main_cpu_reset(void *opaque)
     CPUState *cs = CPU(cpu);
 
     cpu_reset(cs);
-
-    /* All VPs are halted on reset. Leave powering up to CPC. */
-    cs->halted = 1;
 }
 
 static bool cpu_mips_itu_supported(CPUMIPSState *env)
@@ -89,6 +86,9 @@ static void mips_cps_realize(DeviceState *dev, Error **errp)
             env->itc_tag = mips_itu_get_tag_region(&s->itu);
             env->itu = &s->itu;
         }
+        /* All VPs are halted on reset. Leave powering up to CPC. */
+        object_property_set_bool(OBJECT(cpu), "start-powered-off", true,
+                                 &error_abort);
         qemu_register_reset(main_cpu_reset, cpu);
     }

Re: [PATCH v2 5/9] mips/cps: Use start-powered-off CPUState property

Posted by Philippe Mathieu-Daudé 5 years, 3 months ago

On 7/22/20 5:50 AM, Thiago Jung Bauermann wrote:
> Instead of setting CPUState::halted to 1 in main_cpu_reset(), use the
> start-powered-off property which makes cpu_common_reset() initialize it
> to 1 in common code.
> 
> Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> ---
>  hw/mips/cps.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> NB: I was only able to test that this patch builds. I wasn't able to
> run it.
> 
> diff --git a/hw/mips/cps.c b/hw/mips/cps.c
> index 615e1a1ad2..d5b6c78019 100644
> --- a/hw/mips/cps.c
> +++ b/hw/mips/cps.c
> @@ -52,9 +52,6 @@ static void main_cpu_reset(void *opaque)
>      CPUState *cs = CPU(cpu);
>  
>      cpu_reset(cs);
> -
> -    /* All VPs are halted on reset. Leave powering up to CPC. */
> -    cs->halted = 1;
>  }
>  
>  static bool cpu_mips_itu_supported(CPUMIPSState *env)
> @@ -89,6 +86,9 @@ static void mips_cps_realize(DeviceState *dev, Error **errp)
>              env->itc_tag = mips_itu_get_tag_region(&s->itu);
>              env->itu = &s->itu;
>          }
> +        /* All VPs are halted on reset. Leave powering up to CPC. */
> +        object_property_set_bool(OBJECT(cpu), "start-powered-off", true,
> +                                 &error_abort);

This is indeed better as now the property is set once, *after* realize
but *before* reset.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

>          qemu_register_reset(main_cpu_reset, cpu);
>      }
>  
>

Re: [PATCH v2 5/9] mips/cps: Use start-powered-off CPUState property

Posted by Thiago Jung Bauermann 5 years, 3 months ago

Philippe Mathieu-Daudé <philmd@redhat.com> writes:

> On 7/22/20 5:50 AM, Thiago Jung Bauermann wrote:
>> Instead of setting CPUState::halted to 1 in main_cpu_reset(), use the
>> start-powered-off property which makes cpu_common_reset() initialize it
>> to 1 in common code.
>> 
>> Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
>> ---
>>  hw/mips/cps.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>> 
>> NB: I was only able to test that this patch builds. I wasn't able to
>> run it.
>> 
>> diff --git a/hw/mips/cps.c b/hw/mips/cps.c
>> index 615e1a1ad2..d5b6c78019 100644
>> --- a/hw/mips/cps.c
>> +++ b/hw/mips/cps.c
>> @@ -52,9 +52,6 @@ static void main_cpu_reset(void *opaque)
>>      CPUState *cs = CPU(cpu);
>>  
>>      cpu_reset(cs);
>> -
>> -    /* All VPs are halted on reset. Leave powering up to CPC. */
>> -    cs->halted = 1;
>>  }
>>  
>>  static bool cpu_mips_itu_supported(CPUMIPSState *env)
>> @@ -89,6 +86,9 @@ static void mips_cps_realize(DeviceState *dev, Error **errp)
>>              env->itc_tag = mips_itu_get_tag_region(&s->itu);
>>              env->itu = &s->itu;
>>          }
>> +        /* All VPs are halted on reset. Leave powering up to CPC. */
>> +        object_property_set_bool(OBJECT(cpu), "start-powered-off", true,
>> +                                 &error_abort);
>
> This is indeed better as now the property is set once, *after* realize
> but *before* reset.
>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

Thanks for confirming!

>>          qemu_register_reset(main_cpu_reset, cpu);
>>      }
>>  
>> 


-- 
Thiago Jung Bauermann
IBM Linux Technology Center

Re: [PATCH v2 5/9] mips/cps: Use start-powered-off CPUState property

Posted by David Gibson 5 years, 3 months ago

On Wed, Jul 22, 2020 at 12:50:12AM -0300, Thiago Jung Bauermann wrote:
> Instead of setting CPUState::halted to 1 in main_cpu_reset(), use the
> start-powered-off property which makes cpu_common_reset() initialize it
> to 1 in common code.
> 
> Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  hw/mips/cps.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> NB: I was only able to test that this patch builds. I wasn't able to
> run it.
> 
> diff --git a/hw/mips/cps.c b/hw/mips/cps.c
> index 615e1a1ad2..d5b6c78019 100644
> --- a/hw/mips/cps.c
> +++ b/hw/mips/cps.c
> @@ -52,9 +52,6 @@ static void main_cpu_reset(void *opaque)
>      CPUState *cs = CPU(cpu);
>  
>      cpu_reset(cs);
> -
> -    /* All VPs are halted on reset. Leave powering up to CPC. */
> -    cs->halted = 1;
>  }
>  
>  static bool cpu_mips_itu_supported(CPUMIPSState *env)
> @@ -89,6 +86,9 @@ static void mips_cps_realize(DeviceState *dev, Error **errp)
>              env->itc_tag = mips_itu_get_tag_region(&s->itu);
>              env->itu = &s->itu;
>          }
> +        /* All VPs are halted on reset. Leave powering up to CPC. */
> +        object_property_set_bool(OBJECT(cpu), "start-powered-off", true,
> +                                 &error_abort);
>          qemu_register_reset(main_cpu_reset, cpu);
>      }
>  
> 

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson