Merge branch 's390-for-upstream' of git://repo.or.cz/qemu/agraf

* 's390-for-upstream' of git://repo.or.cz/qemu/agraf:
  s390: sclp ascii console support
  s390: sclp signal quiesce support
  s390: sclp event support
  s390: sclp base support
  s390: use sync regs for register transfer
  s390/kvm_stat: correct sys_perf_event_open syscall number
  s390x: fix -initrd in virtio machine

12 files changed, 1315 insertions, 84 deletions

diff --git a/hw/s390-virtio.c b/hw/s390-virtio.c
index 85bd13e06f..685cb5413e 100644
--- a/hw/s390-virtio.c
+++ b/hw/s390-virtio.c
@@ -32,6 +32,7 @@
 #include "exec-memory.h"
 
 #include "hw/s390-virtio-bus.h"
+#include "hw/s390x/sclp.h"
 
 //#define DEBUG_S390
 
@@ -184,6 +185,7 @@ static void s390_init(QEMUMachineInitArgs *args)
 
     /* get a BUS */
     s390_bus = s390_virtio_bus_init(&my_ram_size);
+    s390_sclp_init();
 
     /* allocate RAM */
     memory_region_init_ram(ram, "s390.ram", my_ram_size);
@@ -285,8 +287,8 @@ static void s390_init(QEMUMachineInitArgs *args)
         }
 
         /* we have to overwrite values in the kernel image, which are "rom" */
-        memcpy(rom_ptr(INITRD_PARM_START), &initrd_offset, 8);
-        memcpy(rom_ptr(INITRD_PARM_SIZE), &initrd_size, 8);
+        stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
+        stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
     }
 
     if (rom_ptr(KERN_PARM_AREA)) {
diff --git a/hw/s390x/Makefile.objs b/hw/s390x/Makefile.objs
index dcdcac8a81..096dfcd6a1 100644
--- a/hw/s390x/Makefile.objs
+++ b/hw/s390x/Makefile.objs
@@ -1,3 +1,6 @@
 obj-y = s390-virtio-bus.o s390-virtio.o
 
 obj-y := $(addprefix ../,$(obj-y))
+obj-y += sclp.o
+obj-y += event-facility.o
+obj-y += sclpquiesce.o sclpconsole.o
diff --git a/hw/s390x/event-facility.c b/hw/s390x/event-facility.c
new file mode 100644
index 0000000000..93676602a7
--- /dev/null
+++ b/hw/s390x/event-facility.c
@@ -0,0 +1,398 @@
+/*
+ * SCLP
+ *    Event Facility
+ *       handles SCLP event types
+ *          - Signal Quiesce - system power down
+ *          - ASCII Console Data - VT220 read and write
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Heinz Graalfs <graalfs@de.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version.  See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "monitor.h"
+#include "sysemu.h"
+
+#include "sclp.h"
+#include "event-facility.h"
+
+typedef struct EventTypesBus {
+    BusState qbus;
+} EventTypesBus;
+
+struct SCLPEventFacility {
+    EventTypesBus sbus;
+    DeviceState *qdev;
+    /* guest' receive mask */
+    unsigned int receive_mask;
+};
+
+/* return true if any child has event pending set */
+static bool event_pending(SCLPEventFacility *ef)
+{
+    BusChild *kid;
+    SCLPEvent *event;
+    SCLPEventClass *event_class;
+
+    QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        event = DO_UPCAST(SCLPEvent, qdev, qdev);
+        event_class = SCLP_EVENT_GET_CLASS(event);
+        if (event->event_pending &&
+            event_class->get_send_mask() & ef->receive_mask) {
+            return true;
+        }
+    }
+    return false;
+}
+
+static unsigned int get_host_send_mask(SCLPEventFacility *ef)
+{
+    unsigned int mask;
+    BusChild *kid;
+    SCLPEventClass *child;
+
+    mask = 0;
+
+    QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
+        mask |= child->get_send_mask();
+    }
+    return mask;
+}
+
+static unsigned int get_host_receive_mask(SCLPEventFacility *ef)
+{
+    unsigned int mask;
+    BusChild *kid;
+    SCLPEventClass *child;
+
+    mask = 0;
+
+    QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
+        mask |= child->get_receive_mask();
+    }
+    return mask;
+}
+
+static uint16_t write_event_length_check(SCCB *sccb)
+{
+    int slen;
+    unsigned elen = 0;
+    EventBufferHeader *event;
+    WriteEventData *wed = (WriteEventData *) sccb;
+
+    event = (EventBufferHeader *) &wed->ebh;
+    for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
+        elen = be16_to_cpu(event->length);
+        if (elen < sizeof(*event) || elen > slen) {
+            return SCLP_RC_EVENT_BUFFER_SYNTAX_ERROR;
+        }
+        event = (void *) event + elen;
+    }
+    if (slen) {
+        return SCLP_RC_INCONSISTENT_LENGTHS;
+    }
+    return SCLP_RC_NORMAL_COMPLETION;
+}
+
+static uint16_t handle_write_event_buf(SCLPEventFacility *ef,
+                                       EventBufferHeader *event_buf, SCCB *sccb)
+{
+    uint16_t rc;
+    BusChild *kid;
+    SCLPEvent *event;
+    SCLPEventClass *ec;
+
+    QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        event = (SCLPEvent *) qdev;
+        ec = SCLP_EVENT_GET_CLASS(event);
+
+        rc = SCLP_RC_INVALID_FUNCTION;
+        if (ec->write_event_data &&
+            ec->event_type() == event_buf->type) {
+            rc = ec->write_event_data(event, event_buf);
+            break;
+        }
+    }
+    return rc;
+}
+
+static uint16_t handle_sccb_write_events(SCLPEventFacility *ef, SCCB *sccb)
+{
+    uint16_t rc;
+    int slen;
+    unsigned elen = 0;
+    EventBufferHeader *event_buf;
+    WriteEventData *wed = (WriteEventData *) sccb;
+
+    event_buf = &wed->ebh;
+    rc = SCLP_RC_NORMAL_COMPLETION;
+
+    /* loop over all contained event buffers */
+    for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
+        elen = be16_to_cpu(event_buf->length);
+
+        /* in case of a previous error mark all trailing buffers
+         * as not accepted */
+        if (rc != SCLP_RC_NORMAL_COMPLETION) {
+            event_buf->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
+        } else {
+            rc = handle_write_event_buf(ef, event_buf, sccb);
+        }
+        event_buf = (void *) event_buf + elen;
+    }
+    return rc;
+}
+
+static void write_event_data(SCLPEventFacility *ef, SCCB *sccb)
+{
+    if (sccb->h.function_code != SCLP_FC_NORMAL_WRITE) {
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
+        goto out;
+    }
+    if (be16_to_cpu(sccb->h.length) < 8) {
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
+        goto out;
+    }
+    /* first do a sanity check of the write events */
+    sccb->h.response_code = cpu_to_be16(write_event_length_check(sccb));
+
+    /* if no early error, then execute */
+    if (sccb->h.response_code == be16_to_cpu(SCLP_RC_NORMAL_COMPLETION)) {
+        sccb->h.response_code =
+                cpu_to_be16(handle_sccb_write_events(ef, sccb));
+    }
+
+out:
+    return;
+}
+
+static uint16_t handle_sccb_read_events(SCLPEventFacility *ef, SCCB *sccb,
+                                        unsigned int mask)
+{
+    uint16_t rc;
+    int slen;
+    unsigned elen = 0;
+    BusChild *kid;
+    SCLPEvent *event;
+    SCLPEventClass *ec;
+    EventBufferHeader *event_buf;
+    ReadEventData *red = (ReadEventData *) sccb;
+
+    event_buf = &red->ebh;
+    event_buf->length = 0;
+    slen = sizeof(sccb->data);
+
+    rc = SCLP_RC_NO_EVENT_BUFFERS_STORED;
+
+    QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        event = (SCLPEvent *) qdev;
+        ec = SCLP_EVENT_GET_CLASS(event);
+
+        if (mask & ec->get_send_mask()) {
+            if (ec->read_event_data(event, event_buf, &slen)) {
+                rc = SCLP_RC_NORMAL_COMPLETION;
+            }
+        }
+        elen = be16_to_cpu(event_buf->length);
+        event_buf = (void *) event_buf + elen;
+    }
+
+    if (sccb->h.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE) {
+        /* architecture suggests to reset variable-length-response bit */
+        sccb->h.control_mask[2] &= ~SCLP_VARIABLE_LENGTH_RESPONSE;
+        /* with a new length value */
+        sccb->h.length = cpu_to_be16(SCCB_SIZE - slen);
+    }
+    return rc;
+}
+
+static void read_event_data(SCLPEventFacility *ef, SCCB *sccb)
+{
+    unsigned int sclp_active_selection_mask;
+    unsigned int sclp_cp_receive_mask;
+
+    ReadEventData *red = (ReadEventData *) sccb;
+
+    if (be16_to_cpu(sccb->h.length) != SCCB_SIZE) {
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
+        goto out;
+    }
+
+    sclp_cp_receive_mask = ef->receive_mask;
+
+    /* get active selection mask */
+    switch (sccb->h.function_code) {
+    case SCLP_UNCONDITIONAL_READ:
+        sclp_active_selection_mask = sclp_cp_receive_mask;
+        break;
+    case SCLP_SELECTIVE_READ:
+        if (!(sclp_cp_receive_mask & be32_to_cpu(red->mask))) {
+            sccb->h.response_code =
+                    cpu_to_be16(SCLP_RC_INVALID_SELECTION_MASK);
+            goto out;
+        }
+        sclp_active_selection_mask = be32_to_cpu(red->mask);
+        break;
+    default:
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
+        goto out;
+    }
+    sccb->h.response_code = cpu_to_be16(
+            handle_sccb_read_events(ef, sccb, sclp_active_selection_mask));
+
+out:
+    return;
+}
+
+static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
+{
+    WriteEventMask *we_mask = (WriteEventMask *) sccb;
+
+    /* Attention: We assume that Linux uses 4-byte masks, what it actually
+       does. Architecture allows for masks of variable size, though */
+    if (be16_to_cpu(we_mask->mask_length) != 4) {
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
+        goto out;
+    }
+
+    /* keep track of the guest's capability masks */
+    ef->receive_mask = be32_to_cpu(we_mask->cp_receive_mask);
+
+    /* return the SCLP's capability masks to the guest */
+    we_mask->send_mask = cpu_to_be32(get_host_send_mask(ef));
+    we_mask->receive_mask = cpu_to_be32(get_host_receive_mask(ef));
+
+    sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
+
+out:
+    return;
+}
+
+/* qemu object creation and initialization functions */
+
+#define TYPE_SCLP_EVENTS_BUS "s390-sclp-events-bus"
+
+static void sclp_events_bus_class_init(ObjectClass *klass, void *data)
+{
+}
+
+static const TypeInfo s390_sclp_events_bus_info = {
+    .name = TYPE_SCLP_EVENTS_BUS,
+    .parent = TYPE_BUS,
+    .class_init = sclp_events_bus_class_init,
+};
+
+static void command_handler(SCLPEventFacility *ef, SCCB *sccb, uint64_t code)
+{
+    switch (code) {
+    case SCLP_CMD_READ_EVENT_DATA:
+        read_event_data(ef, sccb);
+        break;
+    case SCLP_CMD_WRITE_EVENT_DATA:
+        write_event_data(ef, sccb);
+        break;
+    case SCLP_CMD_WRITE_EVENT_MASK:
+        write_event_mask(ef, sccb);
+        break;
+    default:
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
+        break;
+    }
+}
+
+static int init_event_facility(S390SCLPDevice *sdev)
+{
+    SCLPEventFacility *event_facility;
+    DeviceState *quiesce;
+
+    event_facility = g_malloc0(sizeof(SCLPEventFacility));
+    sdev->ef = event_facility;
+    sdev->sclp_command_handler = command_handler;
+    sdev->event_pending = event_pending;
+
+    /* Spawn a new sclp-events facility */
+    qbus_create_inplace(&event_facility->sbus.qbus,
+                        TYPE_SCLP_EVENTS_BUS, (DeviceState *)sdev, NULL);
+    event_facility->sbus.qbus.allow_hotplug = 0;
+    event_facility->qdev = (DeviceState *) sdev;
+
+    quiesce = qdev_create(&event_facility->sbus.qbus, "sclpquiesce");
+    if (!quiesce) {
+        return -1;
+    }
+    qdev_init_nofail(quiesce);
+
+    return 0;
+}
+
+static void init_event_facility_class(ObjectClass *klass, void *data)
+{
+    S390SCLPDeviceClass *k = SCLP_S390_DEVICE_CLASS(klass);
+
+    k->init = init_event_facility;
+}
+
+static TypeInfo s390_sclp_event_facility_info = {
+    .name          = "s390-sclp-event-facility",
+    .parent        = TYPE_DEVICE_S390_SCLP,
+    .instance_size = sizeof(S390SCLPDevice),
+    .class_init    = init_event_facility_class,
+};
+
+static int event_qdev_init(DeviceState *qdev)
+{
+    SCLPEvent *event = DO_UPCAST(SCLPEvent, qdev, qdev);
+    SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
+
+    return child->init(event);
+}
+
+static int event_qdev_exit(DeviceState *qdev)
+{
+    SCLPEvent *event = DO_UPCAST(SCLPEvent, qdev, qdev);
+    SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
+    if (child->exit) {
+        child->exit(event);
+    }
+    return 0;
+}
+
+static void event_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->bus_type = TYPE_SCLP_EVENTS_BUS;
+    dc->unplug = qdev_simple_unplug_cb;
+    dc->init = event_qdev_init;
+    dc->exit = event_qdev_exit;
+}
+
+static TypeInfo s390_sclp_event_type_info = {
+    .name = TYPE_SCLP_EVENT,
+    .parent = TYPE_DEVICE,
+    .instance_size = sizeof(SCLPEvent),
+    .class_init = event_class_init,
+    .class_size = sizeof(SCLPEventClass),
+    .abstract = true,
+};
+
+static void register_types(void)
+{
+    type_register_static(&s390_sclp_events_bus_info);
+    type_register_static(&s390_sclp_event_facility_info);
+    type_register_static(&s390_sclp_event_type_info);
+}
+
+type_init(register_types)
diff --git a/hw/s390x/event-facility.h b/hw/s390x/event-facility.h
new file mode 100644
index 0000000000..30af0a76a7
--- /dev/null
+++ b/hw/s390x/event-facility.h
@@ -0,0 +1,96 @@
+/*
+ * SCLP
+ *    Event Facility definitions
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Heinz Graalfs <graalfs@de.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version.  See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef HW_S390_SCLP_EVENT_FACILITY_H
+#define HW_S390_SCLP_EVENT_FACILITY_H
+
+#include <hw/qdev.h>
+#include "qemu-thread.h"
+
+/* SCLP event types */
+#define SCLP_EVENT_ASCII_CONSOLE_DATA           0x1a
+#define SCLP_EVENT_SIGNAL_QUIESCE               0x1d
+
+/* SCLP event masks */
+#define SCLP_EVENT_MASK_SIGNAL_QUIESCE          0x00000008
+#define SCLP_EVENT_MASK_MSG_ASCII               0x00000040
+
+#define SCLP_UNCONDITIONAL_READ                 0x00
+#define SCLP_SELECTIVE_READ                     0x01
+
+#define TYPE_SCLP_EVENT "s390-sclp-event-type"
+#define SCLP_EVENT(obj) \
+     OBJECT_CHECK(SCLPEvent, (obj), TYPE_SCLP_EVENT)
+#define SCLP_EVENT_CLASS(klass) \
+     OBJECT_CLASS_CHECK(SCLPEventClass, (klass), TYPE_SCLP_EVENT)
+#define SCLP_EVENT_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(SCLPEventClass, (obj), TYPE_SCLP_EVENT)
+
+typedef struct WriteEventMask {
+    SCCBHeader h;
+    uint16_t _reserved;
+    uint16_t mask_length;
+    uint32_t cp_receive_mask;
+    uint32_t cp_send_mask;
+    uint32_t send_mask;
+    uint32_t receive_mask;
+} QEMU_PACKED WriteEventMask;
+
+typedef struct EventBufferHeader {
+    uint16_t length;
+    uint8_t  type;
+    uint8_t  flags;
+    uint16_t _reserved;
+} QEMU_PACKED EventBufferHeader;
+
+typedef struct WriteEventData {
+    SCCBHeader h;
+    EventBufferHeader ebh;
+} QEMU_PACKED WriteEventData;
+
+typedef struct ReadEventData {
+    SCCBHeader h;
+    EventBufferHeader ebh;
+    uint32_t mask;
+} QEMU_PACKED ReadEventData;
+
+typedef struct SCLPEvent {
+    DeviceState qdev;
+    bool event_pending;
+    uint32_t event_type;
+    char *name;
+} SCLPEvent;
+
+typedef struct SCLPEventClass {
+    DeviceClass parent_class;
+    int (*init)(SCLPEvent *event);
+    int (*exit)(SCLPEvent *event);
+
+    /* get SCLP's send mask */
+    unsigned int (*get_send_mask)(void);
+
+    /* get SCLP's receive mask */
+    unsigned int (*get_receive_mask)(void);
+
+    int (*read_event_data)(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
+                           int *slen);
+
+    int (*write_event_data)(SCLPEvent *event, EventBufferHeader *evt_buf_hdr);
+
+    /* returns the supported event type */
+    int (*event_type)(void);
+
+} SCLPEventClass;
+
+#endif
diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
new file mode 100644
index 0000000000..5c274fa03d
--- /dev/null
+++ b/hw/s390x/sclp.c
@@ -0,0 +1,163 @@
+/*
+ * SCLP Support
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Christian Borntraeger <borntraeger@de.ibm.com>
+ *  Heinz Graalfs <graalfs@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version.  See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "cpu.h"
+#include "kvm.h"
+#include "memory.h"
+
+#include "sclp.h"
+
+static inline S390SCLPDevice *get_event_facility(void)
+{
+    ObjectProperty *op = object_property_find(qdev_get_machine(),
+                                              "s390-sclp-event-facility",
+                                              NULL);
+    assert(op);
+    return op->opaque;
+}
+
+/* Provide information about the configuration, CPUs and storage */
+static void read_SCP_info(SCCB *sccb)
+{
+    ReadInfo *read_info = (ReadInfo *) sccb;
+    int shift = 0;
+
+    while ((ram_size >> (20 + shift)) > 65535) {
+        shift++;
+    }
+    read_info->rnmax = cpu_to_be16(ram_size >> (20 + shift));
+    read_info->rnsize = 1 << shift;
+    sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
+}
+
+static void sclp_execute(SCCB *sccb, uint64_t code)
+{
+    S390SCLPDevice *sdev = get_event_facility();
+
+    switch (code) {
+    case SCLP_CMDW_READ_SCP_INFO:
+    case SCLP_CMDW_READ_SCP_INFO_FORCED:
+        read_SCP_info(sccb);
+        break;
+    default:
+        sdev->sclp_command_handler(sdev->ef, sccb, code);
+        break;
+    }
+}
+
+int sclp_service_call(uint32_t sccb, uint64_t code)
+{
+    int r = 0;
+    SCCB work_sccb;
+
+    hwaddr sccb_len = sizeof(SCCB);
+
+    /* first some basic checks on program checks */
+    if (cpu_physical_memory_is_io(sccb)) {
+        r = -PGM_ADDRESSING;
+        goto out;
+    }
+    if (sccb & ~0x7ffffff8ul) {
+        r = -PGM_SPECIFICATION;
+        goto out;
+    }
+
+    /*
+     * we want to work on a private copy of the sccb, to prevent guests
+     * from playing dirty tricks by modifying the memory content after
+     * the host has checked the values
+     */
+    cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
+
+    /* Valid sccb sizes */
+    if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
+        be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
+        r = -PGM_SPECIFICATION;
+        goto out;
+    }
+
+    sclp_execute((SCCB *)&work_sccb, code);
+
+    cpu_physical_memory_write(sccb, &work_sccb,
+                              be16_to_cpu(work_sccb.h.length));
+
+    sclp_service_interrupt(sccb);
+
+out:
+    return r;
+}
+
+void sclp_service_interrupt(uint32_t sccb)
+{
+    S390SCLPDevice *sdev = get_event_facility();
+    uint32_t param = sccb & ~3;
+
+    /* Indicate whether an event is still pending */
+    param |= sdev->event_pending(sdev->ef) ? 1 : 0;
+
+    if (!param) {
+        /* No need to send an interrupt, there's nothing to be notified about */
+        return;
+    }
+    s390_sclp_extint(param);
+}
+
+/* qemu object creation and initialization functions */
+
+void s390_sclp_init(void)
+{
+    DeviceState *dev  = qdev_create(NULL, "s390-sclp-event-facility");
+
+    object_property_add_child(qdev_get_machine(), "s390-sclp-event-facility",
+                              OBJECT(dev), NULL);
+    qdev_init_nofail(dev);
+}
+
+static int s390_sclp_dev_init(SysBusDevice *dev)
+{
+    int r;
+    S390SCLPDevice *sdev = (S390SCLPDevice *)dev;
+    S390SCLPDeviceClass *sclp = SCLP_S390_DEVICE_GET_CLASS(dev);
+
+    r = sclp->init(sdev);
+    if (!r) {
+        assert(sdev->event_pending);
+        assert(sdev->sclp_command_handler);
+    }
+
+    return r;
+}
+
+static void s390_sclp_device_class_init(ObjectClass *klass, void *data)
+{
+    SysBusDeviceClass *dc = SYS_BUS_DEVICE_CLASS(klass);
+
+    dc->init = s390_sclp_dev_init;
+}
+
+static TypeInfo s390_sclp_device_info = {
+    .name = TYPE_DEVICE_S390_SCLP,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(S390SCLPDevice),
+    .class_init = s390_sclp_device_class_init,
+    .class_size = sizeof(S390SCLPDeviceClass),
+    .abstract = true,
+};
+
+static void s390_sclp_register_types(void)
+{
+    type_register_static(&s390_sclp_device_info);
+}
+
+type_init(s390_sclp_register_types)
diff --git a/hw/s390x/sclp.h b/hw/s390x/sclp.h
new file mode 100644
index 0000000000..fe89dadd68
--- /dev/null
+++ b/hw/s390x/sclp.h
@@ -0,0 +1,118 @@
+/*
+ * SCLP Support
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Christian Borntraeger <borntraeger@de.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version.  See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef HW_S390_SCLP_H
+#define HW_S390_SCLP_H
+
+#include <hw/sysbus.h>
+#include <hw/qdev.h>
+
+/* SCLP command codes */
+#define SCLP_CMDW_READ_SCP_INFO                 0x00020001
+#define SCLP_CMDW_READ_SCP_INFO_FORCED          0x00120001
+#define SCLP_CMD_READ_EVENT_DATA                0x00770005
+#define SCLP_CMD_WRITE_EVENT_DATA               0x00760005
+#define SCLP_CMD_READ_EVENT_DATA                0x00770005
+#define SCLP_CMD_WRITE_EVENT_DATA               0x00760005
+#define SCLP_CMD_WRITE_EVENT_MASK               0x00780005
+
+/* SCLP response codes */
+#define SCLP_RC_NORMAL_READ_COMPLETION          0x0010
+#define SCLP_RC_NORMAL_COMPLETION               0x0020
+#define SCLP_RC_INVALID_SCLP_COMMAND            0x01f0
+#define SCLP_RC_CONTAINED_EQUIPMENT_CHECK       0x0340
+#define SCLP_RC_INSUFFICIENT_SCCB_LENGTH        0x0300
+#define SCLP_RC_INVALID_FUNCTION                0x40f0
+#define SCLP_RC_NO_EVENT_BUFFERS_STORED         0x60f0
+#define SCLP_RC_INVALID_SELECTION_MASK          0x70f0
+#define SCLP_RC_INCONSISTENT_LENGTHS            0x72f0
+#define SCLP_RC_EVENT_BUFFER_SYNTAX_ERROR       0x73f0
+#define SCLP_RC_INVALID_MASK_LENGTH             0x74f0
+
+
+/* Service Call Control Block (SCCB) and its elements */
+
+#define SCCB_SIZE 4096
+
+#define SCLP_VARIABLE_LENGTH_RESPONSE           0x80
+#define SCLP_EVENT_BUFFER_ACCEPTED              0x80
+
+#define SCLP_FC_NORMAL_WRITE                    0
+
+/*
+ * Normally packed structures are not the right thing to do, since all code
+ * must take care of endianess. We cant use ldl_phys and friends for two
+ * reasons, though:
+ * - some of the embedded structures below the SCCB can appear multiple times
+ *   at different locations, so there is no fixed offset
+ * - we work on a private copy of the SCCB, since there are several length
+ *   fields, that would cause a security nightmare if we allow the guest to
+ *   alter the structure while we parse it. We cannot use ldl_p and friends
+ *   either without doing pointer arithmetics
+ * So we have to double check that all users of sclp data structures use the
+ * right endianess wrappers.
+ */
+typedef struct SCCBHeader {
+    uint16_t length;
+    uint8_t function_code;
+    uint8_t control_mask[3];
+    uint16_t response_code;
+} QEMU_PACKED SCCBHeader;
+
+#define SCCB_DATA_LEN (SCCB_SIZE - sizeof(SCCBHeader))
+
+typedef struct ReadInfo {
+    SCCBHeader h;
+    uint16_t rnmax;
+    uint8_t rnsize;
+} QEMU_PACKED ReadInfo;
+
+typedef struct SCCB {
+    SCCBHeader h;
+    char data[SCCB_DATA_LEN];
+ } QEMU_PACKED SCCB;
+
+static inline int sccb_data_len(SCCB *sccb)
+{
+    return be16_to_cpu(sccb->h.length) - sizeof(sccb->h);
+}
+
+#define TYPE_DEVICE_S390_SCLP "s390-sclp-device"
+#define SCLP_S390_DEVICE(obj) \
+     OBJECT_CHECK(S390SCLPDevice, (obj), TYPE_DEVICE_S390_SCLP)
+#define SCLP_S390_DEVICE_CLASS(klass) \
+     OBJECT_CLASS_CHECK(S390SCLPDeviceClass, (klass), \
+             TYPE_DEVICE_S390_SCLP)
+#define SCLP_S390_DEVICE_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(S390SCLPDeviceClass, (obj), \
+             TYPE_DEVICE_S390_SCLP)
+
+typedef struct SCLPEventFacility SCLPEventFacility;
+
+typedef struct S390SCLPDevice {
+    SysBusDevice busdev;
+    SCLPEventFacility *ef;
+    void (*sclp_command_handler)(SCLPEventFacility *ef, SCCB *sccb,
+                                 uint64_t code);
+    bool (*event_pending)(SCLPEventFacility *ef);
+} S390SCLPDevice;
+
+typedef struct S390SCLPDeviceClass {
+    DeviceClass qdev;
+    int (*init)(S390SCLPDevice *sdev);
+} S390SCLPDeviceClass;
+
+void s390_sclp_init(void);
+void sclp_service_interrupt(uint32_t sccb);
+
+#endif
diff --git a/hw/s390x/sclpconsole.c b/hw/s390x/sclpconsole.c
new file mode 100644
index 0000000000..0ec5623f57
--- /dev/null
+++ b/hw/s390x/sclpconsole.c
@@ -0,0 +1,306 @@
+/*
+ * SCLP event type
+ *    Ascii Console Data (VT220 Console)
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Heinz Graalfs <graalfs@de.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version.  See the COPYING file in the top-level directory.
+ *
+ */
+
+#include <hw/qdev.h>
+#include "qemu-thread.h"
+
+#include "sclp.h"
+#include "event-facility.h"
+
+typedef struct ASCIIConsoleData {
+    EventBufferHeader ebh;
+    char data[0];
+} QEMU_PACKED ASCIIConsoleData;
+
+/* max size for ASCII data in 4K SCCB page */
+#define SIZE_BUFFER_VT220 4080
+
+typedef struct SCLPConsole {
+    SCLPEvent event;
+    CharDriverState *chr;
+    /* io vector                                                       */
+    uint8_t *iov;           /* iov buffer pointer                      */
+    uint8_t *iov_sclp;      /* pointer to SCLP read offset             */
+    uint8_t *iov_bs;        /* pointer byte stream read offset         */
+    uint32_t iov_data_len;  /* length of byte stream in buffer         */
+    uint32_t iov_sclp_rest; /* length of byte stream not read via SCLP */
+    qemu_irq irq_read_vt220;
+} SCLPConsole;
+
+/* character layer call-back functions */
+
+/* Return number of bytes that fit into iov buffer */
+static int chr_can_read(void *opaque)
+{
+    int can_read;
+    SCLPConsole *scon = opaque;
+
+    can_read = SIZE_BUFFER_VT220 - scon->iov_data_len;
+
+    return can_read;
+}
+
+/* Receive n bytes from character layer, save in iov buffer,
+ * and set event pending */
+static void receive_from_chr_layer(SCLPConsole *scon, const uint8_t *buf,
+                                   int size)
+{
+    assert(scon->iov);
+
+    /* read data must fit into current buffer */
+    assert(size <= SIZE_BUFFER_VT220 - scon->iov_data_len);
+
+    /* put byte-stream from character layer into buffer */
+    memcpy(scon->iov_bs, buf, size);
+    scon->iov_data_len += size;
+    scon->iov_sclp_rest += size;
+    scon->iov_bs += size;
+    scon->event.event_pending = true;
+}
+
+/* Send data from a char device over to the guest */
+static void chr_read(void *opaque, const uint8_t *buf, int size)
+{
+    SCLPConsole *scon = opaque;
+
+    assert(scon);
+
+    receive_from_chr_layer(scon, buf, size);
+    /* trigger SCLP read operation */
+    qemu_irq_raise(scon->irq_read_vt220);
+}
+
+static void chr_event(void *opaque, int event)
+{
+    SCLPConsole *scon = opaque;
+
+    switch (event) {
+    case CHR_EVENT_OPENED:
+        if (!scon->iov) {
+            scon->iov = g_malloc0(SIZE_BUFFER_VT220);
+            scon->iov_sclp = scon->iov;
+            scon->iov_bs = scon->iov;
+            scon->iov_data_len = 0;
+            scon->iov_sclp_rest = 0;
+        }
+        break;
+    case CHR_EVENT_CLOSED:
+        if (scon->iov) {
+            g_free(scon->iov);
+            scon->iov = NULL;
+        }
+        break;
+    }
+}
+
+/* functions to be called by event facility */
+
+static int event_type(void)
+{
+    return SCLP_EVENT_ASCII_CONSOLE_DATA;
+}
+
+static unsigned int send_mask(void)
+{
+    return SCLP_EVENT_MASK_MSG_ASCII;
+}
+
+static unsigned int receive_mask(void)
+{
+    return SCLP_EVENT_MASK_MSG_ASCII;
+}
+
+/* triggered by SCLP's read_event_data -
+ * copy console data byte-stream into provided (SCLP) buffer
+ */
+static void get_console_data(SCLPEvent *event, uint8_t *buf, size_t *size,
+                             int avail)
+{
+    SCLPConsole *cons = DO_UPCAST(SCLPConsole, event, event);
+
+    /* first byte is hex 0 saying an ascii string follows */
+    *buf++ = '\0';
+    avail--;
+    /* if all data fit into provided SCLP buffer */
+    if (avail >= cons->iov_sclp_rest) {
+        /* copy character byte-stream to SCLP buffer */
+        memcpy(buf, cons->iov_sclp, cons->iov_sclp_rest);
+        *size = cons->iov_sclp_rest + 1;
+        cons->iov_sclp = cons->iov;
+        cons->iov_bs = cons->iov;
+        cons->iov_data_len = 0;
+        cons->iov_sclp_rest = 0;
+        event->event_pending = false;
+        /* data provided and no more data pending */
+    } else {
+        /* if provided buffer is too small, just copy part */
+        memcpy(buf, cons->iov_sclp, avail);
+        *size = avail + 1;
+        cons->iov_sclp_rest -= avail;
+        cons->iov_sclp += avail;
+        /* more data pending */
+    }
+}
+
+static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
+                           int *slen)
+{
+    int avail;
+    size_t src_len;
+    uint8_t *to;
+    ASCIIConsoleData *acd = (ASCIIConsoleData *) evt_buf_hdr;
+
+    if (!event->event_pending) {
+        /* no data pending */
+        return 0;
+    }
+
+    to = (uint8_t *)&acd->data;
+    avail = *slen - sizeof(ASCIIConsoleData);
+    get_console_data(event, to, &src_len, avail);
+
+    acd->ebh.length = cpu_to_be16(sizeof(ASCIIConsoleData) + src_len);
+    acd->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
+    acd->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
+    *slen = avail - src_len;
+
+    return 1;
+}
+
+/* triggered by SCLP's write_event_data
+ *  - write console data into character layer
+ *  returns < 0 if an error occured
+ */
+static ssize_t write_console_data(SCLPEvent *event, const uint8_t *buf,
+                                  size_t len)
+{
+    ssize_t ret = 0;
+    const uint8_t *iov_offset;
+    SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event);
+
+    if (!scon->chr) {
+        /* If there's no backend, we can just say we consumed all data. */
+        return len;
+    }
+
+    iov_offset = buf;
+    while (len > 0) {
+        ret = qemu_chr_fe_write(scon->chr, buf, len);
+        if (ret == 0) {
+            /* a pty doesn't seem to be connected - no error */
+            len = 0;
+        } else if (ret == -EAGAIN || (ret > 0 && ret < len)) {
+            len -= ret;
+            iov_offset += ret;
+        } else {
+            len = 0;
+        }
+    }
+
+    return ret;
+}
+
+static int write_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr)
+{
+    int rc;
+    int length;
+    ssize_t written;
+    ASCIIConsoleData *acd = (ASCIIConsoleData *) evt_buf_hdr;
+
+    length = be16_to_cpu(evt_buf_hdr->length) - sizeof(EventBufferHeader);
+    written = write_console_data(event, (uint8_t *)acd->data, length);
+
+    rc = SCLP_RC_NORMAL_COMPLETION;
+    /* set event buffer accepted flag */
+    evt_buf_hdr->flags |= SCLP_EVENT_BUFFER_ACCEPTED;
+
+    /* written will be zero if a pty is not connected - don't treat as error */
+    if (written < 0) {
+        /* event buffer not accepted due to error in character layer */
+        evt_buf_hdr->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
+        rc = SCLP_RC_CONTAINED_EQUIPMENT_CHECK;
+    }
+
+    return rc;
+}
+
+static void trigger_ascii_console_data(void *env, int n, int level)
+{
+    sclp_service_interrupt(0);
+}
+
+/* qemu object creation and initialization functions */
+
+/* tell character layer our call-back functions */
+static int console_init(SCLPEvent *event)
+{
+    static bool console_available;
+
+    SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event);
+
+    if (console_available) {
+        error_report("Multiple VT220 operator consoles are not supported");
+        return -1;
+    }
+    console_available = true;
+    event->event_type = SCLP_EVENT_ASCII_CONSOLE_DATA;
+    if (scon->chr) {
+        qemu_chr_add_handlers(scon->chr, chr_can_read,
+                              chr_read, chr_event, scon);
+    }
+    scon->irq_read_vt220 = *qemu_allocate_irqs(trigger_ascii_console_data,
+                                               NULL, 1);
+
+    return 0;
+}
+
+static int console_exit(SCLPEvent *event)
+{
+    return 0;
+}
+
+static Property console_properties[] = {
+    DEFINE_PROP_CHR("chardev", SCLPConsole, chr),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void console_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    SCLPEventClass *ec = SCLP_EVENT_CLASS(klass);
+
+    dc->props = console_properties;
+    ec->init = console_init;
+    ec->exit = console_exit;
+    ec->get_send_mask = send_mask;
+    ec->get_receive_mask = receive_mask;
+    ec->event_type = event_type;
+    ec->read_event_data = read_event_data;
+    ec->write_event_data = write_event_data;
+}
+
+static TypeInfo sclp_console_info = {
+    .name          = "sclpconsole",
+    .parent        = TYPE_SCLP_EVENT,
+    .instance_size = sizeof(SCLPConsole),
+    .class_init    = console_class_init,
+    .class_size    = sizeof(SCLPEventClass),
+};
+
+static void register_types(void)
+{
+    type_register_static(&sclp_console_info);
+}
+
+type_init(register_types)
diff --git a/hw/s390x/sclpquiesce.c b/hw/s390x/sclpquiesce.c
new file mode 100644
index 0000000000..9a773b87ff
--- /dev/null
+++ b/hw/s390x/sclpquiesce.c
@@ -0,0 +1,123 @@
+/*
+ * SCLP event type
+ *    Signal Quiesce - trigger system powerdown request
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Heinz Graalfs <graalfs@de.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version.  See the COPYING file in the top-level directory.
+ *
+ */
+#include <hw/qdev.h>
+#include "sysemu.h"
+#include "sclp.h"
+#include "event-facility.h"
+
+typedef struct SignalQuiesce {
+    EventBufferHeader ebh;
+    uint16_t timeout;
+    uint8_t unit;
+} QEMU_PACKED SignalQuiesce;
+
+static int event_type(void)
+{
+    return SCLP_EVENT_SIGNAL_QUIESCE;
+}
+
+static unsigned int send_mask(void)
+{
+    return SCLP_EVENT_MASK_SIGNAL_QUIESCE;
+}
+
+static unsigned int receive_mask(void)
+{
+    return 0;
+}
+
+static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
+                           int *slen)
+{
+    SignalQuiesce *sq = (SignalQuiesce *) evt_buf_hdr;
+
+    if (*slen < sizeof(SignalQuiesce)) {
+        return 0;
+    }
+
+    if (!event->event_pending) {
+        return 0;
+    }
+    event->event_pending = false;
+
+    sq->ebh.length = cpu_to_be16(sizeof(SignalQuiesce));
+    sq->ebh.type = SCLP_EVENT_SIGNAL_QUIESCE;
+    sq->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
+    /*
+     * system_powerdown does not have a timeout. Fortunately the
+     * timeout value is currently ignored by Linux, anyway
+     */
+    sq->timeout = cpu_to_be16(0);
+    sq->unit = cpu_to_be16(0);
+    *slen -= sizeof(SignalQuiesce);
+
+    return 1;
+}
+
+typedef struct QuiesceNotifier QuiesceNotifier;
+
+static struct QuiesceNotifier {
+    Notifier notifier;
+    SCLPEvent *event;
+} qn;
+
+static void quiesce_powerdown_req(Notifier *n, void *opaque)
+{
+    QuiesceNotifier *qn = container_of(n, QuiesceNotifier, notifier);
+    SCLPEvent *event = qn->event;
+
+    event->event_pending = true;
+    /* trigger SCLP read operation */
+    sclp_service_interrupt(0);
+}
+
+static int quiesce_init(SCLPEvent *event)
+{
+    event->event_type = SCLP_EVENT_SIGNAL_QUIESCE;
+
+    qn.notifier.notify = quiesce_powerdown_req;
+    qn.event = event;
+
+    qemu_register_powerdown_notifier(&qn.notifier);
+
+    return 0;
+}
+
+static void quiesce_class_init(ObjectClass *klass, void *data)
+{
+    SCLPEventClass *k = SCLP_EVENT_CLASS(klass);
+
+    k->init = quiesce_init;
+
+    k->get_send_mask = send_mask;
+    k->get_receive_mask = receive_mask;
+    k->event_type = event_type;
+    k->read_event_data = read_event_data;
+    k->write_event_data = NULL;
+}
+
+static TypeInfo sclp_quiesce_info = {
+    .name          = "sclpquiesce",
+    .parent        = TYPE_SCLP_EVENT,
+    .instance_size = sizeof(SCLPEvent),
+    .class_init    = quiesce_class_init,
+    .class_size    = sizeof(SCLPEventClass),
+};
+
+static void register_types(void)
+{
+    type_register_static(&sclp_quiesce_info);
+}
+
+type_init(register_types)
diff --git a/scripts/kvm/kvm_stat b/scripts/kvm/kvm_stat
index e8d68f05ca..762544b197 100755
--- a/scripts/kvm/kvm_stat
+++ b/scripts/kvm/kvm_stat
@@ -170,6 +170,12 @@ vendor_exit_reasons = {
     'IBM/S390': s390_exit_reasons,
 }
 
+syscall_numbers = {
+    'IBM/S390': 331,
+}
+
+sc_perf_evt_open = 298
+
 exit_reasons = None
 
 for line in file('/proc/cpuinfo').readlines():
@@ -177,7 +183,8 @@ for line in file('/proc/cpuinfo').readlines():
         for flag in line.split():
             if flag in vendor_exit_reasons:
                 exit_reasons = vendor_exit_reasons[flag]
-
+            if flag in syscall_numbers:
+                sc_perf_evt_open = syscall_numbers[flag]
 filters = {
     'kvm_exit': ('exit_reason', exit_reasons)
 }
@@ -206,7 +213,7 @@ class perf_event_attr(ctypes.Structure):
                 ('bp_len', ctypes.c_uint64),
                 ]
 def _perf_event_open(attr, pid, cpu, group_fd, flags):
-    return syscall(298, ctypes.pointer(attr), ctypes.c_int(pid),
+    return syscall(sc_perf_evt_open, ctypes.pointer(attr), ctypes.c_int(pid),
                    ctypes.c_int(cpu), ctypes.c_int(group_fd),
                    ctypes.c_long(flags))
 
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 9997765dd1..5be6e83528 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -596,17 +596,6 @@ static inline const char *cc_name(int cc_op)
     return cc_names[cc_op];
 }
 
-/* SCLP PV interface defines */
-#define SCLP_CMDW_READ_SCP_INFO         0x00020001
-#define SCLP_CMDW_READ_SCP_INFO_FORCED  0x00120001
-
-#define SCP_LENGTH                      0x00
-#define SCP_FUNCTION_CODE               0x02
-#define SCP_CONTROL_MASK                0x03
-#define SCP_RESPONSE_CODE               0x06
-#define SCP_MEM_CODE                    0x08
-#define SCP_INCREMENT                   0x0a
-
 typedef struct LowCore
 {
     /* prefix area: defined by architecture */
@@ -955,7 +944,7 @@ static inline void ebcdic_put(uint8_t *p, const char *ascii, int len)
 void load_psw(CPUS390XState *env, uint64_t mask, uint64_t addr);
 int mmu_translate(CPUS390XState *env, target_ulong vaddr, int rw, uint64_t asc,
                   target_ulong *raddr, int *flags);
-int sclp_service_call(CPUS390XState *env, uint32_t sccb, uint64_t code);
+int sclp_service_call(uint32_t sccb, uint64_t code);
 uint32_t calc_cc(CPUS390XState *env, uint32_t cc_op, uint64_t src, uint64_t dst,
                  uint64_t vr);
 
diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index 07edf93690..a66ac4341c 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -60,15 +60,15 @@
 #define SIGP_STORE_STATUS_ADDR          0x0e
 #define SIGP_SET_ARCH                   0x12
 
-#define SCLP_CMDW_READ_SCP_INFO         0x00020001
-#define SCLP_CMDW_READ_SCP_INFO_FORCED  0x00120001
-
 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
     KVM_CAP_LAST_INFO
 };
 
+static int cap_sync_regs;
+
 int kvm_arch_init(KVMState *s)
 {
+    cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
     return 0;
 }
 
@@ -90,47 +90,116 @@ void kvm_arch_reset_vcpu(CPUS390XState *env)
 
 int kvm_arch_put_registers(CPUS390XState *env, int level)
 {
+    struct kvm_sregs sregs;
     struct kvm_regs regs;
     int ret;
     int i;
 
-    ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
-    if (ret < 0) {
-        return ret;
-    }
+    /* always save the PSW  and the GPRS*/
+    env->kvm_run->psw_addr = env->psw.addr;
+    env->kvm_run->psw_mask = env->psw.mask;
 
-    for (i = 0; i < 16; i++) {
-        regs.gprs[i] = env->regs[i];
+    if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
+        for (i = 0; i < 16; i++) {
+            env->kvm_run->s.regs.gprs[i] = env->regs[i];
+            env->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
+        }
+    } else {
+        for (i = 0; i < 16; i++) {
+            regs.gprs[i] = env->regs[i];
+        }
+        ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
+        if (ret < 0) {
+            return ret;
+        }
     }
 
-    ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
-    if (ret < 0) {
-        return ret;
+    /* Do we need to save more than that? */
+    if (level == KVM_PUT_RUNTIME_STATE) {
+        return 0;
     }
 
-    env->kvm_run->psw_addr = env->psw.addr;
-    env->kvm_run->psw_mask = env->psw.mask;
+    if (cap_sync_regs &&
+        env->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
+        env->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
+        for (i = 0; i < 16; i++) {
+            env->kvm_run->s.regs.acrs[i] = env->aregs[i];
+            env->kvm_run->s.regs.crs[i] = env->cregs[i];
+        }
+        env->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
+        env->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
+    } else {
+        for (i = 0; i < 16; i++) {
+            sregs.acrs[i] = env->aregs[i];
+            sregs.crs[i] = env->cregs[i];
+        }
+        ret = kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
+        if (ret < 0) {
+            return ret;
+        }
+    }
 
-    return ret;
+    /* Finally the prefix */
+    if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
+        env->kvm_run->s.regs.prefix = env->psa;
+        env->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
+    } else {
+        /* prefix is only supported via sync regs */
+    }
+    return 0;
 }
 
 int kvm_arch_get_registers(CPUS390XState *env)
 {
-    int ret;
+    struct kvm_sregs sregs;
     struct kvm_regs regs;
+    int ret;
     int i;
 
-    ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
-    if (ret < 0) {
-        return ret;
+    /* get the PSW */
+    env->psw.addr = env->kvm_run->psw_addr;
+    env->psw.mask = env->kvm_run->psw_mask;
+
+    /* the GPRS */
+    if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
+        for (i = 0; i < 16; i++) {
+            env->regs[i] = env->kvm_run->s.regs.gprs[i];
+        }
+    } else {
+        ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
+        if (ret < 0) {
+            return ret;
+        }
+         for (i = 0; i < 16; i++) {
+            env->regs[i] = regs.gprs[i];
+        }
     }
 
-    for (i = 0; i < 16; i++) {
-        env->regs[i] = regs.gprs[i];
+    /* The ACRS and CRS */
+    if (cap_sync_regs &&
+        env->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
+        env->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
+        for (i = 0; i < 16; i++) {
+            env->aregs[i] = env->kvm_run->s.regs.acrs[i];
+            env->cregs[i] = env->kvm_run->s.regs.crs[i];
+        }
+    } else {
+        ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
+        if (ret < 0) {
+            return ret;
+        }
+         for (i = 0; i < 16; i++) {
+            env->aregs[i] = sregs.acrs[i];
+            env->cregs[i] = sregs.crs[i];
+        }
     }
 
-    env->psw.addr = env->kvm_run->psw_addr;
-    env->psw.mask = env->kvm_run->psw_mask;
+    /* Finally the prefix */
+    if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
+        env->psa = env->kvm_run->s.regs.prefix;
+    } else {
+        /* no prefix without sync regs */
+    }
 
     return 0;
 }
@@ -272,7 +341,7 @@ static int kvm_sclp_service_call(CPUS390XState *env, struct kvm_run *run,
     sccb = env->regs[ipbh0 & 0xf];
     code = env->regs[(ipbh0 & 0xf0) >> 4];
 
-    r = sclp_service_call(env, sccb, code);
+    r = sclp_service_call(sccb, code);
     if (r < 0) {
         enter_pgmcheck(env, -r);
     }
diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c
index fdccd58e3d..38d8f2a627 100644
--- a/target-s390x/misc_helper.c
+++ b/target-s390x/misc_helper.c
@@ -67,55 +67,12 @@ void program_interrupt(CPUS390XState *env, uint32_t code, int ilc)
     }
 }
 
-/*
- * ret < 0 indicates program check, ret = 0, 1, 2, 3 -> cc
- */
-int sclp_service_call(CPUS390XState *env, uint32_t sccb, uint64_t code)
-{
-    int r = 0;
-    int shift = 0;
-
-#ifdef DEBUG_HELPER
-    printf("sclp(0x%x, 0x%" PRIx64 ")\n", sccb, code);
-#endif
-
-    /* basic checks */
-    if (cpu_physical_memory_is_io(sccb)) {
-        return -PGM_ADDRESSING;
-    }
-    if (sccb & ~0x7ffffff8ul) {
-        return -PGM_SPECIFICATION;
-    }
-
-    switch (code) {
-    case SCLP_CMDW_READ_SCP_INFO:
-    case SCLP_CMDW_READ_SCP_INFO_FORCED:
-        while ((ram_size >> (20 + shift)) > 65535) {
-            shift++;
-        }
-        stw_phys(sccb + SCP_MEM_CODE, ram_size >> (20 + shift));
-        stb_phys(sccb + SCP_INCREMENT, 1 << shift);
-        stw_phys(sccb + SCP_RESPONSE_CODE, 0x10);
-
-        s390_sclp_extint(sccb & ~3);
-        break;
-    default:
-#ifdef DEBUG_HELPER
-        printf("KVM: invalid sclp call 0x%x / 0x%" PRIx64 "x\n", sccb, code);
-#endif
-        r = 3;
-        break;
-    }
-
-    return r;
-}
-
 /* SCLP service call */
 uint32_t HELPER(servc)(CPUS390XState *env, uint32_t r1, uint64_t r2)
 {
     int r;
 
-    r = sclp_service_call(env, r1, r2);
+    r = sclp_service_call(r1, r2);
     if (r < 0) {
         program_interrupt(env, -r, 4);
         return 0;