s390: Implement load normal reset

kdump on s390 uses a load normal reset to bring the system in a defined
state by doing a subsystem reset. The issuing CPUs will have an initial
CPU reset, all other CPUs will have a CPU reset as defined in POP (no
register content will change).

Implement this as architectured.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

target-s390x/misc_helper.c

@@ -31,6 +31,7 @@
 
 #if !defined(CONFIG_USER_ONLY)
 #include "exec/softmmu_exec.h"
+#include "sysemu/cpus.h"
 #include "sysemu/sysemu.h"
 #endif
 
@@ -180,6 +181,32 @@ uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
 }
 
 #ifndef CONFIG_USER_ONLY
+static void cpu_reset_all(void)
+{
+    CPUState *cpu;
+    S390CPUClass *scc;
+
+    for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
+        scc = S390_CPU_GET_CLASS(CPU(cpu));
+        scc->cpu_reset(CPU(cpu));
+    }
+}
+
+static int load_normal_reset(S390CPU *cpu)
+{
+    S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
+
+    pause_all_vcpus();
+    cpu_synchronize_all_states();
+    cpu_reset_all();
+    io_subsystem_reset();
+    scc->initial_cpu_reset(CPU(cpu));
+    scc->load_normal(CPU(cpu));
+    cpu_synchronize_all_post_reset();
+    resume_all_vcpus();
+    return 0;
+}
+
 #define DIAG_308_RC_NO_CONF         0x0102
 #define DIAG_308_RC_INVALID         0x0402
 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3)
@@ -198,6 +225,9 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3)
     }
 
     switch (subcode) {
+    case 1:
+        load_normal_reset(s390_env_get_cpu(env));
+        break;
     case 5:
         if ((r1 & 1) || (addr & 0x0fffULL)) {
             program_interrupt(env, PGM_SPECIFICATION, ILEN_LATER_INC);