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[PATCH v3 4/5] s390x: Move clear reset

Janosch Frank posted 5 patches 6 years, 2 months ago
Maintainers: Cornelia Huck <cohuck@redhat.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Richard Henderson <rth@twiddle.net>, David Hildenbrand <david@redhat.com>
[PATCH v3 4/5] s390x: Move clear reset
Posted by Janosch Frank 6 years, 2 months ago 
Let's also move the clear reset function into the reset handler.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 target/s390x/cpu-qom.h |  1 +
 target/s390x/cpu.c     | 58 +++++++++++++-----------------------------
 2 files changed, 18 insertions(+), 41 deletions(-)

diff --git a/target/s390x/cpu-qom.h b/target/s390x/cpu-qom.h
index 6f0a12042e..dbe5346ec9 100644
--- a/target/s390x/cpu-qom.h
+++ b/target/s390x/cpu-qom.h
@@ -37,6 +37,7 @@ typedef struct S390CPUDef S390CPUDef;
 typedef enum cpu_reset_type {
     S390_CPU_RESET_NORMAL,
     S390_CPU_RESET_INITIAL,
+    S390_CPU_RESET_CLEAR,
 } cpu_reset_type;
 
 /**
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index 9f009b226c..4853cef204 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -94,6 +94,9 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 
     switch (type) {
+    case S390_CPU_RESET_CLEAR:
+        memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
+        /* fall through */
     case S390_CPU_RESET_INITIAL:
         /* initial reset does not clear everything! */
         memset(&env->start_initial_reset_fields, 0,
@@ -107,6 +110,14 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
         env->cregs[0] = CR0_RESET;
         env->cregs[14] = CR14_RESET;
 
+#if defined(CONFIG_USER_ONLY)
+        /* user mode should always be allowed to use the full FPU */
+        env->cregs[0] |= CR0_AFP;
+        if (s390_has_feat(S390_FEAT_VECTOR)) {
+            env->cregs[0] |= CR0_VECTOR;
+        }
+#endif
+
         /* tininess for underflow is detected before rounding */
         set_float_detect_tininess(float_tininess_before_rounding,
                                   &env->fpu_status);
@@ -122,46 +133,6 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
     }
 }
 
-/* CPUClass:reset() */
-static void s390_cpu_full_reset(CPUState *s)
-{
-    S390CPU *cpu = S390_CPU(s);
-    S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
-    CPUS390XState *env = &cpu->env;
-
-    scc->parent_reset(s);
-    cpu->env.sigp_order = 0;
-    s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
-
-    memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
-
-    /* architectured initial values for CR 0 and 14 */
-    env->cregs[0] = CR0_RESET;
-    env->cregs[14] = CR14_RESET;
-
-#if defined(CONFIG_USER_ONLY)
-    /* user mode should always be allowed to use the full FPU */
-    env->cregs[0] |= CR0_AFP;
-    if (s390_has_feat(S390_FEAT_VECTOR)) {
-        env->cregs[0] |= CR0_VECTOR;
-    }
-#endif
-
-    /* architectured initial value for Breaking-Event-Address register */
-    env->gbea = 1;
-
-    env->pfault_token = -1UL;
-
-    /* tininess for underflow is detected before rounding */
-    set_float_detect_tininess(float_tininess_before_rounding,
-                              &env->fpu_status);
-
-    /* Reset state inside the kernel that we cannot access yet from QEMU. */
-    if (kvm_enabled()) {
-        kvm_s390_reset_vcpu(cpu);
-    }
-}
-
 #if !defined(CONFIG_USER_ONLY)
 static void s390_cpu_machine_reset_cb(void *opaque)
 {
@@ -453,6 +424,11 @@ static Property s390x_cpu_properties[] = {
     DEFINE_PROP_END_OF_LIST()
 };
 
+static void s390_cpu_reset_clear(CPUState *s)
+{
+    return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
+}
+
 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 {
     S390CPUClass *scc = S390_CPU_CLASS(oc);
@@ -469,7 +445,7 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
     scc->load_normal = s390_cpu_load_normal;
 #endif
     scc->reset = s390_cpu_reset;
-    cc->reset = s390_cpu_full_reset;
+    cc->reset = s390_cpu_reset_clear;
     cc->class_by_name = s390_cpu_class_by_name,
     cc->has_work = s390_cpu_has_work;
 #ifdef CONFIG_TCG
-- 
2.20.1
Re: [PATCH v3 4/5] s390x: Move clear reset
Posted by Cornelia Huck 6 years, 2 months ago 
On Mon, 25 Nov 2019 04:03:47 -0500
Janosch Frank <frankja@linux.ibm.com> wrote:

> Let's also move the clear reset function into the reset handler.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> ---
>  target/s390x/cpu-qom.h |  1 +
>  target/s390x/cpu.c     | 58 +++++++++++++-----------------------------
>  2 files changed, 18 insertions(+), 41 deletions(-)
> 

> @@ -453,6 +424,11 @@ static Property s390x_cpu_properties[] = {
>      DEFINE_PROP_END_OF_LIST()
>  };
>  
> +static void s390_cpu_reset_clear(CPUState *s)
> +{
> +    return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
> +}
> +
>  static void s390_cpu_class_init(ObjectClass *oc, void *data)
>  {
>      S390CPUClass *scc = S390_CPU_CLASS(oc);
> @@ -469,7 +445,7 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
>      scc->load_normal = s390_cpu_load_normal;
>  #endif
>      scc->reset = s390_cpu_reset;
> -    cc->reset = s390_cpu_full_reset;
> +    cc->reset = s390_cpu_reset_clear;
>      cc->class_by_name = s390_cpu_class_by_name,
>      cc->has_work = s390_cpu_has_work;
>  #ifdef CONFIG_TCG

One thing I liked about the previous naming is that it is more obvious
that the clear reset is actually the full reset of a cpu. Not sure if
keeping that is better than matching the function name to the name of
the reset being performed. Opinions?
Re: [PATCH v3 4/5] s390x: Move clear reset
Posted by Janosch Frank 6 years, 2 months ago 
On 11/25/19 2:37 PM, Cornelia Huck wrote:
> On Mon, 25 Nov 2019 04:03:47 -0500
> Janosch Frank <frankja@linux.ibm.com> wrote:
> 
>> Let's also move the clear reset function into the reset handler.
>>
>> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
>> ---
>>  target/s390x/cpu-qom.h |  1 +
>>  target/s390x/cpu.c     | 58 +++++++++++++-----------------------------
>>  2 files changed, 18 insertions(+), 41 deletions(-)
>>
> 
>> @@ -453,6 +424,11 @@ static Property s390x_cpu_properties[] = {
>>      DEFINE_PROP_END_OF_LIST()
>>  };
>>  
>> +static void s390_cpu_reset_clear(CPUState *s)
>> +{
>> +    return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
>> +}
>> +
>>  static void s390_cpu_class_init(ObjectClass *oc, void *data)
>>  {
>>      S390CPUClass *scc = S390_CPU_CLASS(oc);
>> @@ -469,7 +445,7 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
>>      scc->load_normal = s390_cpu_load_normal;
>>  #endif
>>      scc->reset = s390_cpu_reset;
>> -    cc->reset = s390_cpu_full_reset;
>> +    cc->reset = s390_cpu_reset_clear;
>>      cc->class_by_name = s390_cpu_class_by_name,
>>      cc->has_work = s390_cpu_has_work;
>>  #ifdef CONFIG_TCG
> 
> One thing I liked about the previous naming is that it is more obvious
> that the clear reset is actually the full reset of a cpu. Not sure if
> keeping that is better than matching the function name to the name of
> the reset being performed. Opinions?
> 

Are you only worrying for this particular wrapper or in general?
I'd be happy to rename the wrapper to s390_cpu_reset_full()
Re: [PATCH v3 4/5] s390x: Move clear reset
Posted by Cornelia Huck 6 years, 2 months ago 
On Mon, 25 Nov 2019 14:49:54 +0100
Janosch Frank <frankja@linux.ibm.com> wrote:

> On 11/25/19 2:37 PM, Cornelia Huck wrote:
> > On Mon, 25 Nov 2019 04:03:47 -0500
> > Janosch Frank <frankja@linux.ibm.com> wrote:
> >   
> >> Let's also move the clear reset function into the reset handler.
> >>
> >> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> >> ---
> >>  target/s390x/cpu-qom.h |  1 +
> >>  target/s390x/cpu.c     | 58 +++++++++++++-----------------------------
> >>  2 files changed, 18 insertions(+), 41 deletions(-)
> >>  
> >   
> >> @@ -453,6 +424,11 @@ static Property s390x_cpu_properties[] = {
> >>      DEFINE_PROP_END_OF_LIST()
> >>  };
> >>  
> >> +static void s390_cpu_reset_clear(CPUState *s)
> >> +{
> >> +    return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
> >> +}
> >> +
> >>  static void s390_cpu_class_init(ObjectClass *oc, void *data)
> >>  {
> >>      S390CPUClass *scc = S390_CPU_CLASS(oc);
> >> @@ -469,7 +445,7 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
> >>      scc->load_normal = s390_cpu_load_normal;
> >>  #endif
> >>      scc->reset = s390_cpu_reset;
> >> -    cc->reset = s390_cpu_full_reset;
> >> +    cc->reset = s390_cpu_reset_clear;
> >>      cc->class_by_name = s390_cpu_class_by_name,
> >>      cc->has_work = s390_cpu_has_work;
> >>  #ifdef CONFIG_TCG  
> > 
> > One thing I liked about the previous naming is that it is more obvious
> > that the clear reset is actually the full reset of a cpu. Not sure if
> > keeping that is better than matching the function name to the name of
> > the reset being performed. Opinions?
> >   
> 
> Are you only worrying for this particular wrapper or in general?
> I'd be happy to rename the wrapper to s390_cpu_reset_full()

Yes, I was thinking about this wrapper only, but don't feel too
strongly.

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