diff mbox series

[v4,3/6] s390x: Move initial reset

Message ID 20191127175046.4911-4-frankja@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series s390x: Cleanup | expand

Commit Message

Janosch Frank Nov. 27, 2019, 5:50 p.m. UTC 
Let's move the intial reset into the reset handler and cleanup
afterwards.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
---
 target/s390x/cpu-qom.h |  2 +-
 target/s390x/cpu.c     | 44 ++++++++++++++++--------------------------
 target/s390x/cpu.h     |  2 +-
 target/s390x/sigp.c    |  2 +-
 4 files changed, 20 insertions(+), 30 deletions(-)

Comments

Thomas Huth Nov. 28, 2019, 7 a.m. UTC | #1 
On 27/11/2019 18.50, Janosch Frank wrote:
> Let's move the intial reset into the reset handler and cleanup
> afterwards.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: David Hildenbrand <david@redhat.com>
> ---
>   target/s390x/cpu-qom.h |  2 +-
>   target/s390x/cpu.c     | 44 ++++++++++++++++--------------------------
>   target/s390x/cpu.h     |  2 +-
>   target/s390x/sigp.c    |  2 +-
>   4 files changed, 20 insertions(+), 30 deletions(-)
> 
> diff --git a/target/s390x/cpu-qom.h b/target/s390x/cpu-qom.h
> index f3b71bac67..6f0a12042e 100644
> --- a/target/s390x/cpu-qom.h
> +++ b/target/s390x/cpu-qom.h
> @@ -36,6 +36,7 @@ typedef struct S390CPUDef S390CPUDef;
>   
>   typedef enum cpu_reset_type {
>       S390_CPU_RESET_NORMAL,
> +    S390_CPU_RESET_INITIAL,
>   } cpu_reset_type;
>   
>   /**
> @@ -62,7 +63,6 @@ typedef struct S390CPUClass {
>       void (*parent_reset)(CPUState *cpu);
>       void (*load_normal)(CPUState *cpu);
>       void (*reset)(CPUState *cpu, cpu_reset_type type);
> -    void (*initial_cpu_reset)(CPUState *cpu);
>   } S390CPUClass;
>   
>   typedef struct S390CPU S390CPU;
> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
> index 67d6fbfa44..55e2d1fe7b 100644
> --- a/target/s390x/cpu.c
> +++ b/target/s390x/cpu.c
> @@ -94,6 +94,23 @@ 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_INITIAL:
> +        /* 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 value for Breaking-Event-Address register */
> +        env->gbea = 1;
> +
> +        /* architectured initial values for CR 0 and 14 */
> +        env->cregs[0] = CR0_RESET;
> +        env->cregs[14] = CR14_RESET;
> +
> +        /* tininess for underflow is detected before rounding */
> +        set_float_detect_tininess(float_tininess_before_rounding,
> +                                  &env->fpu_status);
> +       /* fall through */
>       case S390_CPU_RESET_NORMAL:
>           env->pfault_token = -1UL;
>           env->bpbc = false;
> @@ -101,32 +118,6 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
>       default:
>           g_assert_not_reached();
>       }
> -}
> -
> -/* S390CPUClass::initial_reset() */
> -static void s390_cpu_initial_reset(CPUState *s)
> -{
> -    S390CPU *cpu = S390_CPU(s);
> -    CPUS390XState *env = &cpu->env;
> -
> -    s390_cpu_reset(s, S390_CPU_RESET_NORMAL);
> -    /* 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);
>   
>       /* Reset state inside the kernel that we cannot access yet from QEMU. */
>       if (kvm_enabled()) {

You're doing the if (kvm_enabled()) now also for S390_CPU_RESET_NORMAL 
... is that OK? It's doing an KVM_S390_INITIAL_RESET ioctl(), so that 
sounds suspicious to me. Don't you have to add a check for type != 
S390_CPU_RESET_NORMAL here?

  Thomas
Janosch Frank Nov. 28, 2019, 7:22 a.m. UTC | #2 
On 11/28/19 8:00 AM, Thomas Huth wrote:
> On 27/11/2019 18.50, Janosch Frank wrote:
>> Let's move the intial reset into the reset handler and cleanup
>> afterwards.
>>
>> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
>> Reviewed-by: David Hildenbrand <david@redhat.com>
>> ---
>>   target/s390x/cpu-qom.h |  2 +-
>>   target/s390x/cpu.c     | 44 ++++++++++++++++--------------------------
>>   target/s390x/cpu.h     |  2 +-
>>   target/s390x/sigp.c    |  2 +-
>>   4 files changed, 20 insertions(+), 30 deletions(-)
>>
>> diff --git a/target/s390x/cpu-qom.h b/target/s390x/cpu-qom.h
>> index f3b71bac67..6f0a12042e 100644
>> --- a/target/s390x/cpu-qom.h
>> +++ b/target/s390x/cpu-qom.h
>> @@ -36,6 +36,7 @@ typedef struct S390CPUDef S390CPUDef;
>>   
>>   typedef enum cpu_reset_type {
>>       S390_CPU_RESET_NORMAL,
>> +    S390_CPU_RESET_INITIAL,
>>   } cpu_reset_type;
>>   
>>   /**
>> @@ -62,7 +63,6 @@ typedef struct S390CPUClass {
>>       void (*parent_reset)(CPUState *cpu);
>>       void (*load_normal)(CPUState *cpu);
>>       void (*reset)(CPUState *cpu, cpu_reset_type type);
>> -    void (*initial_cpu_reset)(CPUState *cpu);
>>   } S390CPUClass;
>>   
>>   typedef struct S390CPU S390CPU;
>> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
>> index 67d6fbfa44..55e2d1fe7b 100644
>> --- a/target/s390x/cpu.c
>> +++ b/target/s390x/cpu.c
>> @@ -94,6 +94,23 @@ 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_INITIAL:
>> +        /* 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 value for Breaking-Event-Address register */
>> +        env->gbea = 1;
>> +
>> +        /* architectured initial values for CR 0 and 14 */
>> +        env->cregs[0] = CR0_RESET;
>> +        env->cregs[14] = CR14_RESET;
>> +
>> +        /* tininess for underflow is detected before rounding */
>> +        set_float_detect_tininess(float_tininess_before_rounding,
>> +                                  &env->fpu_status);
>> +       /* fall through */
>>       case S390_CPU_RESET_NORMAL:
>>           env->pfault_token = -1UL;
>>           env->bpbc = false;
>> @@ -101,32 +118,6 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
>>       default:
>>           g_assert_not_reached();
>>       }
>> -}
>> -
>> -/* S390CPUClass::initial_reset() */
>> -static void s390_cpu_initial_reset(CPUState *s)
>> -{
>> -    S390CPU *cpu = S390_CPU(s);
>> -    CPUS390XState *env = &cpu->env;
>> -
>> -    s390_cpu_reset(s, S390_CPU_RESET_NORMAL);
>> -    /* 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);
>>   
>>       /* Reset state inside the kernel that we cannot access yet from QEMU. */
>>       if (kvm_enabled()) {
> 
> You're doing the if (kvm_enabled()) now also for S390_CPU_RESET_NORMAL 
> ... is that OK? It's doing an KVM_S390_INITIAL_RESET ioctl(), so that 
> sounds suspicious to me. Don't you have to add a check for type != 
> S390_CPU_RESET_NORMAL here?
> 
>   Thomas

Yes, I need to fence the NORMAL case again.

> 
>
diff mbox series

Patch

diff --git a/target/s390x/cpu-qom.h b/target/s390x/cpu-qom.h
index f3b71bac67..6f0a12042e 100644
--- a/target/s390x/cpu-qom.h
+++ b/target/s390x/cpu-qom.h
@@ -36,6 +36,7 @@  typedef struct S390CPUDef S390CPUDef;
 
 typedef enum cpu_reset_type {
     S390_CPU_RESET_NORMAL,
+    S390_CPU_RESET_INITIAL,
 } cpu_reset_type;
 
 /**
@@ -62,7 +63,6 @@  typedef struct S390CPUClass {
     void (*parent_reset)(CPUState *cpu);
     void (*load_normal)(CPUState *cpu);
     void (*reset)(CPUState *cpu, cpu_reset_type type);
-    void (*initial_cpu_reset)(CPUState *cpu);
 } S390CPUClass;
 
 typedef struct S390CPU S390CPU;
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index 67d6fbfa44..55e2d1fe7b 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -94,6 +94,23 @@  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_INITIAL:
+        /* 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 value for Breaking-Event-Address register */
+        env->gbea = 1;
+
+        /* architectured initial values for CR 0 and 14 */
+        env->cregs[0] = CR0_RESET;
+        env->cregs[14] = CR14_RESET;
+
+        /* tininess for underflow is detected before rounding */
+        set_float_detect_tininess(float_tininess_before_rounding,
+                                  &env->fpu_status);
+       /* fall through */
     case S390_CPU_RESET_NORMAL:
         env->pfault_token = -1UL;
         env->bpbc = false;
@@ -101,32 +118,6 @@  static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
     default:
         g_assert_not_reached();
     }
-}
-
-/* S390CPUClass::initial_reset() */
-static void s390_cpu_initial_reset(CPUState *s)
-{
-    S390CPU *cpu = S390_CPU(s);
-    CPUS390XState *env = &cpu->env;
-
-    s390_cpu_reset(s, S390_CPU_RESET_NORMAL);
-    /* 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);
 
     /* Reset state inside the kernel that we cannot access yet from QEMU. */
     if (kvm_enabled()) {
@@ -481,7 +472,6 @@  static void s390_cpu_class_init(ObjectClass *oc, void *data)
     scc->load_normal = s390_cpu_load_normal;
 #endif
     scc->reset = s390_cpu_reset;
-    scc->initial_cpu_reset = s390_cpu_initial_reset;
     cc->reset = s390_cpu_full_reset;
     cc->class_by_name = s390_cpu_class_by_name,
     cc->has_work = s390_cpu_has_work;
diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index 18123dfd5b..d2af13b345 100644
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -748,7 +748,7 @@  static inline void s390_do_cpu_initial_reset(CPUState *cs, run_on_cpu_data arg)
 {
     S390CPUClass *scc = S390_CPU_GET_CLASS(cs);
 
-    scc->initial_cpu_reset(cs);
+    scc->reset(cs, S390_CPU_RESET_INITIAL);
 }
 
 static inline void s390_do_cpu_load_normal(CPUState *cs, run_on_cpu_data arg)
diff --git a/target/s390x/sigp.c b/target/s390x/sigp.c
index 850139b9cd..727875bb4a 100644
--- a/target/s390x/sigp.c
+++ b/target/s390x/sigp.c
@@ -254,7 +254,7 @@  static void sigp_initial_cpu_reset(CPUState *cs, run_on_cpu_data arg)
     SigpInfo *si = arg.host_ptr;
 
     cpu_synchronize_state(cs);
-    scc->initial_cpu_reset(cs);
+    scc->reset(cs, S390_CPU_RESET_INITIAL);
     cpu_synchronize_post_reset(cs);
     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 }