6 files changed, 34 insertions, 5 deletions

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 22222c4fd5..4e140bbead 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -486,6 +486,10 @@ static void s390_machine_reset(MachineState *machine)
     default:
         g_assert_not_reached();
     }
+
+    CPU_FOREACH(t) {
+        run_on_cpu(t, s390_do_cpu_set_diag318, RUN_ON_CPU_HOST_ULONG(0));
+    }
     s390_ipl_clear_reset_request();
 }
 
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index 66f5942b53..7b66718c44 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -447,6 +447,13 @@ void s390_enable_css_support(S390CPU *cpu)
         kvm_s390_enable_css_support(cpu);
     }
 }
+
+void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
+{
+    if (kvm_enabled()) {
+        kvm_s390_set_diag318(cs, arg.host_ulong);
+    }
+}
 #endif
 
 static gchar *s390_gdb_arch_name(CPUState *cs)
diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index f875ebf0f4..60d434d5ed 100644
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -769,6 +769,7 @@ int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit);
 void s390_set_max_pagesize(uint64_t pagesize, Error **errp);
 void s390_cmma_reset(void);
 void s390_enable_css_support(S390CPU *cpu);
+void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg);
 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
                                 int vq, bool assign);
 #ifndef CONFIG_USER_ONLY
diff --git a/target/s390x/kvm-stub.c b/target/s390x/kvm-stub.c
index aa185017a2..9970b5a8c7 100644
--- a/target/s390x/kvm-stub.c
+++ b/target/s390x/kvm-stub.c
@@ -120,3 +120,7 @@ void kvm_s390_stop_interrupt(S390CPU *cpu)
 void kvm_s390_restart_interrupt(S390CPU *cpu)
 {
 }
+
+void kvm_s390_set_diag318(CPUState *cs, uint64_t diag318_info)
+{
+}
diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
index baa070fdf7..b8385e6b95 100644
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -1611,10 +1611,23 @@ static int handle_sw_breakpoint(S390CPU *cpu, struct kvm_run *run)
     return -ENOENT;
 }
 
+void kvm_s390_set_diag318(CPUState *cs, uint64_t diag318_info)
+{
+    CPUS390XState *env = &S390_CPU(cs)->env;
+
+    /* Feat bit is set only if KVM supports sync for diag318 */
+    if (s390_has_feat(S390_FEAT_DIAG_318)) {
+        env->diag318_info = diag318_info;
+        cs->kvm_run->s.regs.diag318 = diag318_info;
+        cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_DIAG318;
+    }
+}
+
 static void handle_diag_318(S390CPU *cpu, struct kvm_run *run)
 {
     uint64_t reg = (run->s390_sieic.ipa & 0x00f0) >> 4;
     uint64_t diag318_info = run->s.regs.gprs[reg];
+    CPUState *t;
 
     /*
      * DIAG 318 can only be enabled with KVM support. As such, let's
@@ -1622,13 +1635,12 @@ static void handle_diag_318(S390CPU *cpu, struct kvm_run *run)
      */
     if (!s390_has_feat(S390_FEAT_DIAG_318)) {
         kvm_s390_program_interrupt(cpu, PGM_SPECIFICATION);
+        return;
     }
 
-    cpu->env.diag318_info = diag318_info;
-
-    if (can_sync_regs(CPU(cpu), KVM_SYNC_DIAG318)) {
-        run->s.regs.diag318 = diag318_info;
-        run->kvm_dirty_regs |= KVM_SYNC_DIAG318;
+    CPU_FOREACH(t) {
+        run_on_cpu(t, s390_do_cpu_set_diag318,
+                   RUN_ON_CPU_HOST_ULONG(diag318_info));
     }
 }
 
diff --git a/target/s390x/kvm_s390x.h b/target/s390x/kvm_s390x.h
index 6ab17c81b7..25bbe98b25 100644
--- a/target/s390x/kvm_s390x.h
+++ b/target/s390x/kvm_s390x.h
@@ -45,5 +45,6 @@ void kvm_s390_set_max_pagesize(uint64_t pagesize, Error **errp);
 void kvm_s390_crypto_reset(void);
 void kvm_s390_restart_interrupt(S390CPU *cpu);
 void kvm_s390_stop_interrupt(S390CPU *cpu);
+void kvm_s390_set_diag318(CPUState *cs, uint64_t diag318_info);
 
 #endif /* KVM_S390X_H */