s390x/cmma: clean up cmma reset

The cmma reset is per VM, so we don't need a cpu object. We can
directly make use of kvm_state, as it is already available when
the reset is called. By moving the cmma reset in our machine reset
function, we can avoid a manual reset handler.
Acked-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>

hw/s390x/s390-virtio.c

@@ -320,6 +320,7 @@ void s390_machine_reset(void)
     S390CPU *ipl_cpu = S390_CPU(qemu_get_cpu(0));
 
     qemu_devices_reset();
+    s390_cmma_reset();
     s390_crypto_reset();
 
     /* all cpus are stopped - configure and start the ipl cpu only */

target-s390x/cpu.h

@@ -1160,7 +1160,7 @@ int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
                                     int vq, bool assign);
 int kvm_s390_cpu_restart(S390CPU *cpu);
 int kvm_s390_get_memslot_count(KVMState *s);
-void kvm_s390_clear_cmma_callback(void *opaque);
+void kvm_s390_cmma_reset(void);
 int kvm_s390_set_cpu_state(S390CPU *cpu, uint8_t cpu_state);
 void kvm_s390_reset_vcpu(S390CPU *cpu);
 int kvm_s390_set_mem_limit(KVMState *s, uint64_t new_limit, uint64_t *hw_limit);
@@ -1190,7 +1190,7 @@ static inline int kvm_s390_cpu_restart(S390CPU *cpu)
 {
     return -ENOSYS;
 }
-static inline void kvm_s390_clear_cmma_callback(void *opaque)
+static inline void kvm_s390_cmma_reset(void)
 {
 }
 static inline int kvm_s390_get_memslot_count(KVMState *s)
@@ -1229,11 +1229,10 @@ static inline int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
     return 0;
 }
 
-static inline void cmma_reset(S390CPU *cpu)
+static inline void s390_cmma_reset(void)
 {
     if (kvm_enabled()) {
-        CPUState *cs = CPU(cpu);
-        kvm_s390_clear_cmma_callback(cs->kvm_state);
+        kvm_s390_cmma_reset();
     }
 }
 

target-s390x/kvm.c

@@ -173,16 +173,15 @@ int kvm_s390_set_mem_limit(KVMState *s, uint64_t new_limit, uint64_t *hw_limit)
     return kvm_vm_ioctl(s, KVM_SET_DEVICE_ATTR, &attr);
 }
 
-void kvm_s390_clear_cmma_callback(void *opaque)
+void kvm_s390_cmma_reset(void)
 {
     int rc;
-    KVMState *s = opaque;
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_MEM_CTRL,
         .attr = KVM_S390_VM_MEM_CLR_CMMA,
     };
 
-    rc = kvm_vm_ioctl(s, KVM_SET_DEVICE_ATTR, &attr);
+    rc = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
     trace_kvm_clear_cmma(rc);
 }
 
@@ -200,9 +199,6 @@ static void kvm_s390_enable_cmma(KVMState *s)
     }
 
     rc = kvm_vm_ioctl(s, KVM_SET_DEVICE_ATTR, &attr);
-    if (!rc) {
-        qemu_register_reset(kvm_s390_clear_cmma_callback, s);
-    }
     trace_kvm_enable_cmma(rc);
 }
 

target-s390x/misc_helper.c

@@ -127,7 +127,7 @@ static int modified_clear_reset(S390CPU *cpu)
     CPU_FOREACH(t) {
         run_on_cpu(t, s390_do_cpu_full_reset, t);
     }
-    cmma_reset(cpu);
+    s390_cmma_reset();
     subsystem_reset();
     s390_crypto_reset();
     scc->load_normal(CPU(cpu));
@@ -146,7 +146,7 @@ static int load_normal_reset(S390CPU *cpu)
     CPU_FOREACH(t) {
         run_on_cpu(t, s390_do_cpu_reset, t);
     }
-    cmma_reset(cpu);
+    s390_cmma_reset();
     subsystem_reset();
     scc->initial_cpu_reset(CPU(cpu));
     scc->load_normal(CPU(cpu));