Re: [PATCH v3 1/8] target/arm: Move start-powered-off property to generic CPUState

[Greg Kurz <groug@kaod.org>]

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On Thu, 23 Jul 2020 13:06:09 +1000
David Gibson <david@gibson.dropbear.id.au> wrote:

> On Wed, Jul 22, 2020 at 11:56:50PM -0300, Thiago Jung Bauermann wrote:
> > There are other platforms which also have CPUs that start powered off, so
> > generalize the start-powered-off property so that it can be used by them.
> > 
> > Note that ARMv7MState also has a property of the same name but this patch
> > doesn't change it because that class isn't a subclass of CPUState so it
> > wouldn't be a trivial change.
> > 
> > This change should not cause any change in behavior.
> > 
> > Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
> > Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> > Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> 
> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> 

Reviewed-by: Greg Kurz <groug@kaod.org>

> > ---
> >  exec.c                | 1 +
> >  include/hw/core/cpu.h | 4 ++++
> >  target/arm/cpu.c      | 5 ++---
> >  target/arm/cpu.h      | 3 ---
> >  target/arm/kvm32.c    | 2 +-
> >  target/arm/kvm64.c    | 2 +-
> >  6 files changed, 9 insertions(+), 8 deletions(-)
> > 
> > NB: I was only able to test that this patch builds. I wasn't able to
> > run it.
> > 
> > diff --git a/exec.c b/exec.c
> > index 6f381f98e2..82e82fab09 100644
> > --- a/exec.c
> > +++ b/exec.c
> > @@ -899,6 +899,7 @@ Property cpu_common_props[] = {
> >      DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
> >                       MemoryRegion *),
> >  #endif
> > +    DEFINE_PROP_BOOL("start-powered-off", CPUState, start_powered_off, false),
> >      DEFINE_PROP_END_OF_LIST(),
> >  };
> >  
> > diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
> > index 8f145733ce..9fc2696db5 100644
> > --- a/include/hw/core/cpu.h
> > +++ b/include/hw/core/cpu.h
> > @@ -374,6 +374,10 @@ struct CPUState {
> >      bool created;
> >      bool stop;
> >      bool stopped;
> > +
> > +    /* Should CPU start in powered-off state? */
> > +    bool start_powered_off;
> > +
> >      bool unplug;
> >      bool crash_occurred;
> >      bool exit_request;
> > diff --git a/target/arm/cpu.c b/target/arm/cpu.c
> > index 111579554f..ec65c7653f 100644
> > --- a/target/arm/cpu.c
> > +++ b/target/arm/cpu.c
> > @@ -174,8 +174,8 @@ static void arm_cpu_reset(DeviceState *dev)
> >      env->vfp.xregs[ARM_VFP_MVFR1] = cpu->isar.mvfr1;
> >      env->vfp.xregs[ARM_VFP_MVFR2] = cpu->isar.mvfr2;
> >  
> > -    cpu->power_state = cpu->start_powered_off ? PSCI_OFF : PSCI_ON;
> > -    s->halted = cpu->start_powered_off;
> > +    cpu->power_state = s->start_powered_off ? PSCI_OFF : PSCI_ON;
> > +    s->halted = s->start_powered_off;
> >  
> >      if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
> >          env->iwmmxt.cregs[ARM_IWMMXT_wCID] = 0x69051000 | 'Q';
> > @@ -2182,7 +2182,6 @@ static const ARMCPUInfo arm_cpus[] = {
> >  };
> >  
> >  static Property arm_cpu_properties[] = {
> > -    DEFINE_PROP_BOOL("start-powered-off", ARMCPU, start_powered_off, false),
> >      DEFINE_PROP_UINT32("psci-conduit", ARMCPU, psci_conduit, 0),
> >      DEFINE_PROP_UINT64("midr", ARMCPU, midr, 0),
> >      DEFINE_PROP_UINT64("mp-affinity", ARMCPU,
> > diff --git a/target/arm/cpu.h b/target/arm/cpu.h
> > index 9e8ed423ea..a925d26996 100644
> > --- a/target/arm/cpu.h
> > +++ b/target/arm/cpu.h
> > @@ -810,9 +810,6 @@ struct ARMCPU {
> >       */
> >      uint32_t psci_version;
> >  
> > -    /* Should CPU start in PSCI powered-off state? */
> > -    bool start_powered_off;
> > -
> >      /* Current power state, access guarded by BQL */
> >      ARMPSCIState power_state;
> >  
> > diff --git a/target/arm/kvm32.c b/target/arm/kvm32.c
> > index 0af46b41c8..1f2b8f8b7a 100644
> > --- a/target/arm/kvm32.c
> > +++ b/target/arm/kvm32.c
> > @@ -218,7 +218,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
> >  
> >      /* Determine init features for this CPU */
> >      memset(cpu->kvm_init_features, 0, sizeof(cpu->kvm_init_features));
> > -    if (cpu->start_powered_off) {
> > +    if (cs->start_powered_off) {
> >          cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_POWER_OFF;
> >      }
> >      if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) {
> > diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c
> > index 1169237905..f8a6d905fb 100644
> > --- a/target/arm/kvm64.c
> > +++ b/target/arm/kvm64.c
> > @@ -775,7 +775,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
> >  
> >      /* Determine init features for this CPU */
> >      memset(cpu->kvm_init_features, 0, sizeof(cpu->kvm_init_features));
> > -    if (cpu->start_powered_off) {
> > +    if (cs->start_powered_off) {
> >          cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_POWER_OFF;
> >      }
> >      if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) {
> > 
> 


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