Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20150508' into staging

Assorted s390x patches:
- updates for virtio-ccw and s390-virtio, making them more similar
  to virtio-pci
- improvements regarding per-vcpu interrupts and migration

# gpg: Signature made Fri May  8 09:45:09 2015 BST using RSA key ID C6F02FAF
# gpg: Good signature from "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>"

* remotes/cohuck/tags/s390x-20150508:
  s390x/kvm: migrate vcpu interrupt state
  s390x: move fpu regs into a subsection of the vmstate
  s390x/kvm: use ioctl KVM_S390_IRQ for vcpu interrupts
  virtio-ccw: implement ->device_plugged
  virtio-ccw: change realization sequence
  s390-virtio: clear {used,avail}_event_idx on reset as well
  s390-virtio: use common features
  s390-virtio: Accommodate guests using virtqueues too early

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

3 files changed, 62 insertions, 48 deletions

diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c
index c27f8a531b..4f69cbbb70 100644
--- a/hw/s390x/s390-virtio-bus.c
+++ b/hw/s390x/s390-virtio-bus.c
@@ -77,10 +77,18 @@ void s390_virtio_reset_idx(VirtIOS390Device *dev)
             VIRTIO_VRING_AVAIL_IDX_OFFS;
         address_space_stw(&address_space_memory, idx_addr, 0,
                           MEMTXATTRS_UNSPECIFIED, NULL);
+        idx_addr = virtio_queue_get_avail_addr(dev->vdev, i) +
+            virtio_queue_get_avail_size(dev->vdev, i);
+        address_space_stw(&address_space_memory, idx_addr, 0,
+                          MEMTXATTRS_UNSPECIFIED, NULL);
         idx_addr = virtio_queue_get_used_addr(dev->vdev, i) +
             VIRTIO_VRING_USED_IDX_OFFS;
         address_space_stw(&address_space_memory, idx_addr, 0,
                           MEMTXATTRS_UNSPECIFIED, NULL);
+        idx_addr = virtio_queue_get_used_addr(dev->vdev, i) +
+            virtio_queue_get_used_size(dev->vdev, i);
+        address_space_stw(&address_space_memory, idx_addr, 0,
+                          MEMTXATTRS_UNSPECIFIED, NULL);
     }
 }
 
@@ -530,7 +538,6 @@ static unsigned virtio_s390_get_features(DeviceState *d)
 /**************** S390 Virtio Bus Device Descriptions *******************/
 
 static Property s390_virtio_net_properties[] = {
-    DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
     DEFINE_VIRTIO_NET_FEATURES(VirtIOS390Device, host_features),
     DEFINE_PROP_END_OF_LIST(),
 };
@@ -592,18 +599,12 @@ static const TypeInfo s390_virtio_serial = {
     .class_init    = s390_virtio_serial_class_init,
 };
 
-static Property s390_virtio_rng_properties[] = {
-    DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
 static void s390_virtio_rng_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 
     k->realize = s390_virtio_rng_realize;
-    dc->props = s390_virtio_rng_properties;
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 }
 
@@ -632,10 +633,16 @@ static void s390_virtio_busdev_reset(DeviceState *dev)
     virtio_reset(_dev->vdev);
 }
 
+static Property virtio_s390_properties[] = {
+    DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void virtio_s390_device_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
+    dc->props = virtio_s390_properties;
     dc->realize = s390_virtio_busdev_realize;
     dc->bus_type = TYPE_S390_VIRTIO_BUS;
     dc->reset = s390_virtio_busdev_reset;
@@ -651,7 +658,6 @@ static const TypeInfo virtio_s390_device_info = {
 };
 
 static Property s390_virtio_scsi_properties[] = {
-    DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
     DEFINE_VIRTIO_SCSI_FEATURES(VirtIOS390Device, host_features),
     DEFINE_PROP_END_OF_LIST(),
 };
@@ -675,18 +681,12 @@ static const TypeInfo s390_virtio_scsi = {
 };
 
 #ifdef CONFIG_VHOST_SCSI
-static Property s390_vhost_scsi_properties[] = {
-    DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
 static void s390_vhost_scsi_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 
     k->realize = s390_vhost_scsi_realize;
-    dc->props = s390_vhost_scsi_properties;
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 }
 
diff --git a/hw/s390x/s390-virtio.c b/hw/s390x/s390-virtio.c
index 3a1b9ee2d0..59750dbfcd 100644
--- a/hw/s390x/s390-virtio.c
+++ b/hw/s390x/s390-virtio.c
@@ -77,6 +77,16 @@ static int s390_virtio_hcall_notify(const uint64_t *args)
     if (mem > ram_size) {
         VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
         if (dev) {
+            /*
+             * Older kernels will use the virtqueue before setting DRIVER_OK.
+             * In this case the feature bits are not yet up to date, meaning
+             * that several funny things can happen, e.g. the guest thinks
+             * EVENT_IDX is on and QEMU thinks it is off. Let's force a feature
+             * and status sync.
+             */
+            if (!(dev->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+                s390_virtio_device_update_status(dev);
+            }
             virtio_queue_notify(dev->vdev, i);
         } else {
             r = -EINVAL;
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index c1d8288b71..430cc6f017 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -642,8 +642,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
     return ret;
 }
 
-static void virtio_ccw_device_realize(VirtioCcwDevice *dev,
-                                      VirtIODevice *vdev, Error **errp)
+static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp)
 {
     unsigned int cssid = 0;
     unsigned int ssid = 0;
@@ -653,7 +652,8 @@ static void virtio_ccw_device_realize(VirtioCcwDevice *dev,
     bool found = false;
     SubchDev *sch;
     int num;
-    DeviceState *parent = DEVICE(dev);
+    Error *err = NULL;
+    VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
 
     sch = g_malloc0(sizeof(SubchDev));
 
@@ -766,17 +766,16 @@ static void virtio_ccw_device_realize(VirtioCcwDevice *dev,
     memset(&sch->id, 0, sizeof(SenseId));
     sch->id.reserved = 0xff;
     sch->id.cu_type = VIRTIO_CCW_CU_TYPE;
-    sch->id.cu_model = vdev->device_id;
-
-    /* Only the first 32 feature bits are used. */
-    dev->host_features[0] = virtio_bus_get_vdev_features(&dev->bus,
-                                                         dev->host_features[0]);
 
-    virtio_add_feature(&dev->host_features[0], VIRTIO_F_NOTIFY_ON_EMPTY);
-    virtio_add_feature(&dev->host_features[0], VIRTIO_F_BAD_FEATURE);
+    if (k->realize) {
+        k->realize(dev, &err);
+    }
+    if (err) {
+        error_propagate(errp, err);
+        css_subch_assign(cssid, ssid, schid, devno, NULL);
+        goto out_err;
+    }
 
-    css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
-                          parent->hotplugged, 1);
     return;
 
 out_err:
@@ -813,10 +812,7 @@ static void virtio_ccw_net_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
     if (err) {
         error_propagate(errp, err);
-        return;
     }
-
-    virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
 }
 
 static void virtio_ccw_net_instance_init(Object *obj)
@@ -839,10 +835,7 @@ static void virtio_ccw_blk_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
     if (err) {
         error_propagate(errp, err);
-        return;
     }
-
-    virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
 }
 
 static void virtio_ccw_blk_instance_init(Object *obj)
@@ -879,10 +872,7 @@ static void virtio_ccw_serial_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
     if (err) {
         error_propagate(errp, err);
-        return;
     }
-
-    virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
 }
 
 
@@ -904,10 +894,7 @@ static void virtio_ccw_balloon_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
     if (err) {
         error_propagate(errp, err);
-        return;
     }
-
-    virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
 }
 
 static void balloon_ccw_stats_get_all(Object *obj, struct Visitor *v,
@@ -972,10 +959,7 @@ static void virtio_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
     if (err) {
         error_propagate(errp, err);
-        return;
     }
-
-    virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
 }
 
 static void virtio_ccw_scsi_instance_init(Object *obj)
@@ -999,10 +983,7 @@ static void vhost_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
     if (err) {
         error_propagate(errp, err);
-        return;
     }
-
-    virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
 }
 
 static void vhost_ccw_scsi_instance_init(Object *obj)
@@ -1030,8 +1011,6 @@ static void virtio_ccw_rng_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     object_property_set_link(OBJECT(dev),
                              OBJECT(dev->vdev.conf.rng), "rng",
                              NULL);
-
-    virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
 }
 
 /* DeviceState to VirtioCcwDevice. Note: used on datapath,
@@ -1434,6 +1413,30 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
     return 0;
 }
 
+/* This is called by virtio-bus just after the device is plugged. */
+static void virtio_ccw_device_plugged(DeviceState *d)
+{
+    VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
+    SubchDev *sch = dev->sch;
+
+    sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus);
+
+    /* Only the first 32 feature bits are used. */
+    virtio_add_feature(&dev->host_features[0], VIRTIO_F_NOTIFY_ON_EMPTY);
+    virtio_add_feature(&dev->host_features[0], VIRTIO_F_BAD_FEATURE);
+    dev->host_features[0] = virtio_bus_get_vdev_features(&dev->bus,
+                                                         dev->host_features[0]);
+
+    css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
+                          d->hotplugged, 1);
+}
+
+static void virtio_ccw_device_unplugged(DeviceState *d)
+{
+    VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
+
+    virtio_ccw_stop_ioeventfd(dev);
+}
 /**************** Virtio-ccw Bus Device Descriptions *******************/
 
 static Property virtio_ccw_net_properties[] = {
@@ -1640,10 +1643,9 @@ static const TypeInfo virtio_ccw_rng = {
 static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp)
 {
     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
-    VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
 
     virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev);
-    _info->realize(_dev, errp);
+    virtio_ccw_device_realize(_dev, errp);
 }
 
 static int virtio_ccw_busdev_exit(DeviceState *dev)
@@ -1759,6 +1761,8 @@ static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
     k->load_queue = virtio_ccw_load_queue;
     k->save_config = virtio_ccw_save_config;
     k->load_config = virtio_ccw_load_config;
+    k->device_plugged = virtio_ccw_device_plugged;
+    k->device_unplugged = virtio_ccw_device_unplugged;
 }
 
 static const TypeInfo virtio_ccw_bus_info = {