[2/4] s390x: Cleanup cpu resets
diff mbox series

Message ID 20191122075218.23935-3-frankja@linux.ibm.com
State New
Headers show
Series
  • s390x: Reset cleanup
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Commit Message

Janosch Frank Nov. 22, 2019, 7:52 a.m. UTC
Let's move the resets into one function and switch by type, so we can
use fallthroughs for shared reset actions.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 target/s390x/cpu.c | 110 ++++++++++++++++++++-------------------------
 1 file changed, 48 insertions(+), 62 deletions(-)

Comments

Philippe Mathieu-Daudé Nov. 22, 2019, 10:35 a.m. UTC | #1
Hi Janosh,

On 11/22/19 8:52 AM, Janosch Frank wrote:
> Let's move the resets into one function and switch by type, so we can
> use fallthroughs for shared reset actions.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> ---
>   target/s390x/cpu.c | 110 ++++++++++++++++++++-------------------------
>   1 file changed, 48 insertions(+), 62 deletions(-)
> 
> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
> index 3abe7e80fd..556afecbc1 100644
> --- a/target/s390x/cpu.c
> +++ b/target/s390x/cpu.c
> @@ -82,67 +82,52 @@ static void s390_cpu_load_normal(CPUState *s)
>   }
>   #endif
>   
> -/* S390CPUClass::cpu_reset() */
> -static void s390_cpu_reset(CPUState *s)
> +typedef enum cpu_reset_type {
> +    S390_CPU_RESET_NORMAL,
> +    S390_CPU_RESET_INITIAL,
> +    S390_CPU_RESET_CLEAR,
> +} cpu_reset_type;
> +
> +static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
>   {
>       S390CPU *cpu = S390_CPU(s);
>       S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
>       CPUS390XState *env = &cpu->env;
>   
> -    env->pfault_token = -1UL;
> -    env->bpbc = false;
>       scc->parent_reset(s);
>       cpu->env.sigp_order = 0;
>       s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
> -}
>   
> -/* S390CPUClass::initial_reset() */
> -static void s390_cpu_initial_reset(CPUState *s)
> -{
> -    S390CPU *cpu = S390_CPU(s);
> -    CPUS390XState *env = &cpu->env;
> +    /* Set initial values after clearing */
> +    switch (type) {
> +    case S390_CPU_RESET_CLEAR:
> +        memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
> +        /* Fallthrough */
> +    case S390_CPU_RESET_INITIAL:
> +        memset(&env->start_initial_reset_fields, 0,
> +               offsetof(CPUS390XState, end_reset_fields) -
> +               offsetof(CPUS390XState, start_initial_reset_fields));
> +        /* architectured initial values for CR 0 and 14 */
> +        env->cregs[0] = CR0_RESET;
> +        env->cregs[14] = CR14_RESET;
>   
> -    s390_cpu_reset(s);
> -    /* initial reset does not clear everything! */
> -    memset(&env->start_initial_reset_fields, 0,
> -        offsetof(CPUS390XState, end_reset_fields) -
> -        offsetof(CPUS390XState, start_initial_reset_fields));
> -
> -    /* architectured initial values for CR 0 and 14 */
> -    env->cregs[0] = CR0_RESET;
> -    env->cregs[14] = CR14_RESET;
> -
> -    /* 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);
> +        /* architectured initial value for Breaking-Event-Address register */
> +        env->gbea = 1;
> +        /* tininess for underflow is detected before rounding */
> +        set_float_detect_tininess(float_tininess_before_rounding,
> +                                  &env->fpu_status);
> +        /* Fallthrough */
> +    case S390_CPU_RESET_NORMAL:
> +        env->pfault_token = -1UL;
> +        env->bpbc = false;
> +        break;
> +    }
>   
>       /* Reset state inside the kernel that we cannot access yet from QEMU. */
> -    if (kvm_enabled()) {
> -        kvm_s390_reset_vcpu(cpu);
> +    if (kvm_enabled() && (type == S390_CPU_RESET_CLEAR ||
> +                          type == S390_CPU_RESET_INITIAL)) {
> +            kvm_s390_reset_vcpu(cpu);
>       }
> -}
> -
> -/* 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 */
> @@ -151,20 +136,21 @@ static void s390_cpu_full_reset(CPUState *s)
>           env->cregs[0] |= CR0_VECTOR;
>       }
>   #endif
> +}
>   
> -    /* architectured initial value for Breaking-Event-Address register */
> -    env->gbea = 1;
> +static void s390_cpu_reset_normal(CPUState *s)
> +{
> +    return s390_cpu_reset(s, S390_CPU_RESET_NORMAL);
> +}
>   
> -    env->pfault_token = -1UL;
> +static void s390_cpu_reset_initial(CPUState *s)
> +{
> +    return s390_cpu_reset(s, S390_CPU_RESET_INITIAL);
> +}
>   
> -    /* 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);
> -    }
> +static void s390_cpu_reset_clear(CPUState *s)
> +{
> +    return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
>   }
>   
>   #if !defined(CONFIG_USER_ONLY)
> @@ -473,9 +459,9 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
>   #if !defined(CONFIG_USER_ONLY)
>       scc->load_normal = s390_cpu_load_normal;
>   #endif
> -    scc->cpu_reset = s390_cpu_reset;
> -    scc->initial_cpu_reset = s390_cpu_initial_reset;
> -    cc->reset = s390_cpu_full_reset;
> +    scc->cpu_reset = s390_cpu_reset_normal;
> +    scc->initial_cpu_reset = s390_cpu_reset_initial;
> +    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
> 

This is a nice cleanup, but the patch is hard to digest.
Maybe you can split it in 3, one patch for each cpu_reset_type.

Regards,

Phil.
David Hildenbrand Nov. 22, 2019, 11:14 a.m. UTC | #2
[...]

>   
>   #if !defined(CONFIG_USER_ONLY)
> @@ -473,9 +459,9 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
>   #if !defined(CONFIG_USER_ONLY)
>       scc->load_normal = s390_cpu_load_normal;
>   #endif
> -    scc->cpu_reset = s390_cpu_reset;
> -    scc->initial_cpu_reset = s390_cpu_initial_reset;
> -    cc->reset = s390_cpu_full_reset;
> +    scc->cpu_reset = s390_cpu_reset_normal;
> +    scc->initial_cpu_reset = s390_cpu_reset_initial;

What about having only one function here

scc->cpu_reset(), where you directly pass in the reset type

instead of scc->cpu_reset/scc->initial_cpu_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
>
Janosch Frank Nov. 22, 2019, 1:07 p.m. UTC | #3
On 11/22/19 11:35 AM, Philippe Mathieu-Daudé wrote:
> Hi Janosh,
> 
> On 11/22/19 8:52 AM, Janosch Frank wrote:
>> Let's move the resets into one function and switch by type, so we can
>> use fallthroughs for shared reset actions.
>>
>> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
>> ---
>>   target/s390x/cpu.c | 110 ++++++++++++++++++++-------------------------
>>   1 file changed, 48 insertions(+), 62 deletions(-)
>>
>> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
>> index 3abe7e80fd..556afecbc1 100644
>> --- a/target/s390x/cpu.c
>> +++ b/target/s390x/cpu.c
>> @@ -82,67 +82,52 @@ static void s390_cpu_load_normal(CPUState *s)
>>   }
>>   #endif
>>   
>> -/* S390CPUClass::cpu_reset() */
>> -static void s390_cpu_reset(CPUState *s)
>> +typedef enum cpu_reset_type {
>> +    S390_CPU_RESET_NORMAL,
>> +    S390_CPU_RESET_INITIAL,
>> +    S390_CPU_RESET_CLEAR,
>> +} cpu_reset_type;
>> +
>> +static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
>>   {
>>       S390CPU *cpu = S390_CPU(s);
>>       S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
>>       CPUS390XState *env = &cpu->env;
>>   
>> -    env->pfault_token = -1UL;
>> -    env->bpbc = false;
>>       scc->parent_reset(s);
>>       cpu->env.sigp_order = 0;
>>       s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
>> -}
>>   
>> -/* S390CPUClass::initial_reset() */
>> -static void s390_cpu_initial_reset(CPUState *s)
>> -{
>> -    S390CPU *cpu = S390_CPU(s);
>> -    CPUS390XState *env = &cpu->env;
>> +    /* Set initial values after clearing */
>> +    switch (type) {
>> +    case S390_CPU_RESET_CLEAR:
>> +        memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
>> +        /* Fallthrough */
>> +    case S390_CPU_RESET_INITIAL:
>> +        memset(&env->start_initial_reset_fields, 0,
>> +               offsetof(CPUS390XState, end_reset_fields) -
>> +               offsetof(CPUS390XState, start_initial_reset_fields));
>> +        /* architectured initial values for CR 0 and 14 */
>> +        env->cregs[0] = CR0_RESET;
>> +        env->cregs[14] = CR14_RESET;
>>   
>> -    s390_cpu_reset(s);
>> -    /* initial reset does not clear everything! */
>> -    memset(&env->start_initial_reset_fields, 0,
>> -        offsetof(CPUS390XState, end_reset_fields) -
>> -        offsetof(CPUS390XState, start_initial_reset_fields));
>> -
>> -    /* architectured initial values for CR 0 and 14 */
>> -    env->cregs[0] = CR0_RESET;
>> -    env->cregs[14] = CR14_RESET;
>> -
>> -    /* 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);
>> +        /* architectured initial value for Breaking-Event-Address register */
>> +        env->gbea = 1;
>> +        /* tininess for underflow is detected before rounding */
>> +        set_float_detect_tininess(float_tininess_before_rounding,
>> +                                  &env->fpu_status);
>> +        /* Fallthrough */
>> +    case S390_CPU_RESET_NORMAL:
>> +        env->pfault_token = -1UL;
>> +        env->bpbc = false;
>> +        break;
>> +    }
>>   
>>       /* Reset state inside the kernel that we cannot access yet from QEMU. */
>> -    if (kvm_enabled()) {
>> -        kvm_s390_reset_vcpu(cpu);
>> +    if (kvm_enabled() && (type == S390_CPU_RESET_CLEAR ||
>> +                          type == S390_CPU_RESET_INITIAL)) {
>> +            kvm_s390_reset_vcpu(cpu);
>>       }
>> -}
>> -
>> -/* 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 */
>> @@ -151,20 +136,21 @@ static void s390_cpu_full_reset(CPUState *s)
>>           env->cregs[0] |= CR0_VECTOR;
>>       }
>>   #endif
>> +}
>>   
>> -    /* architectured initial value for Breaking-Event-Address register */
>> -    env->gbea = 1;
>> +static void s390_cpu_reset_normal(CPUState *s)
>> +{
>> +    return s390_cpu_reset(s, S390_CPU_RESET_NORMAL);
>> +}
>>   
>> -    env->pfault_token = -1UL;
>> +static void s390_cpu_reset_initial(CPUState *s)
>> +{
>> +    return s390_cpu_reset(s, S390_CPU_RESET_INITIAL);
>> +}
>>   
>> -    /* 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);
>> -    }
>> +static void s390_cpu_reset_clear(CPUState *s)
>> +{
>> +    return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
>>   }
>>   
>>   #if !defined(CONFIG_USER_ONLY)
>> @@ -473,9 +459,9 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
>>   #if !defined(CONFIG_USER_ONLY)
>>       scc->load_normal = s390_cpu_load_normal;
>>   #endif
>> -    scc->cpu_reset = s390_cpu_reset;
>> -    scc->initial_cpu_reset = s390_cpu_initial_reset;
>> -    cc->reset = s390_cpu_full_reset;
>> +    scc->cpu_reset = s390_cpu_reset_normal;
>> +    scc->initial_cpu_reset = s390_cpu_reset_initial;
>> +    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
>>
> 
> This is a nice cleanup, but the patch is hard to digest.
> Maybe you can split it in 3, one patch for each cpu_reset_type.
> 
> Regards,
> 
> Phil.
> 

I'll try to split it up.

Patch
diff mbox series

diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index 3abe7e80fd..556afecbc1 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -82,67 +82,52 @@  static void s390_cpu_load_normal(CPUState *s)
 }
 #endif
 
-/* S390CPUClass::cpu_reset() */
-static void s390_cpu_reset(CPUState *s)
+typedef enum cpu_reset_type {
+    S390_CPU_RESET_NORMAL,
+    S390_CPU_RESET_INITIAL,
+    S390_CPU_RESET_CLEAR,
+} cpu_reset_type;
+
+static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
 {
     S390CPU *cpu = S390_CPU(s);
     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
     CPUS390XState *env = &cpu->env;
 
-    env->pfault_token = -1UL;
-    env->bpbc = false;
     scc->parent_reset(s);
     cpu->env.sigp_order = 0;
     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
-}
 
-/* S390CPUClass::initial_reset() */
-static void s390_cpu_initial_reset(CPUState *s)
-{
-    S390CPU *cpu = S390_CPU(s);
-    CPUS390XState *env = &cpu->env;
+    /* Set initial values after clearing */
+    switch (type) {
+    case S390_CPU_RESET_CLEAR:
+        memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
+        /* Fallthrough */
+    case S390_CPU_RESET_INITIAL:
+        memset(&env->start_initial_reset_fields, 0,
+               offsetof(CPUS390XState, end_reset_fields) -
+               offsetof(CPUS390XState, start_initial_reset_fields));
+        /* architectured initial values for CR 0 and 14 */
+        env->cregs[0] = CR0_RESET;
+        env->cregs[14] = CR14_RESET;
 
-    s390_cpu_reset(s);
-    /* initial reset does not clear everything! */
-    memset(&env->start_initial_reset_fields, 0,
-        offsetof(CPUS390XState, end_reset_fields) -
-        offsetof(CPUS390XState, start_initial_reset_fields));
-
-    /* architectured initial values for CR 0 and 14 */
-    env->cregs[0] = CR0_RESET;
-    env->cregs[14] = CR14_RESET;
-
-    /* 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);
+        /* architectured initial value for Breaking-Event-Address register */
+        env->gbea = 1;
+        /* tininess for underflow is detected before rounding */
+        set_float_detect_tininess(float_tininess_before_rounding,
+                                  &env->fpu_status);
+        /* Fallthrough */
+    case S390_CPU_RESET_NORMAL:
+        env->pfault_token = -1UL;
+        env->bpbc = false;
+        break;
+    }
 
     /* Reset state inside the kernel that we cannot access yet from QEMU. */
-    if (kvm_enabled()) {
-        kvm_s390_reset_vcpu(cpu);
+    if (kvm_enabled() && (type == S390_CPU_RESET_CLEAR ||
+                          type == S390_CPU_RESET_INITIAL)) {
+            kvm_s390_reset_vcpu(cpu);
     }
-}
-
-/* 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 */
@@ -151,20 +136,21 @@  static void s390_cpu_full_reset(CPUState *s)
         env->cregs[0] |= CR0_VECTOR;
     }
 #endif
+}
 
-    /* architectured initial value for Breaking-Event-Address register */
-    env->gbea = 1;
+static void s390_cpu_reset_normal(CPUState *s)
+{
+    return s390_cpu_reset(s, S390_CPU_RESET_NORMAL);
+}
 
-    env->pfault_token = -1UL;
+static void s390_cpu_reset_initial(CPUState *s)
+{
+    return s390_cpu_reset(s, S390_CPU_RESET_INITIAL);
+}
 
-    /* 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);
-    }
+static void s390_cpu_reset_clear(CPUState *s)
+{
+    return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
 }
 
 #if !defined(CONFIG_USER_ONLY)
@@ -473,9 +459,9 @@  static void s390_cpu_class_init(ObjectClass *oc, void *data)
 #if !defined(CONFIG_USER_ONLY)
     scc->load_normal = s390_cpu_load_normal;
 #endif
-    scc->cpu_reset = s390_cpu_reset;
-    scc->initial_cpu_reset = s390_cpu_initial_reset;
-    cc->reset = s390_cpu_full_reset;
+    scc->cpu_reset = s390_cpu_reset_normal;
+    scc->initial_cpu_reset = s390_cpu_reset_initial;
+    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