Merge remote-tracking branch 'remotes/cohuck-gitlab/tags/s390x-20210520-v2' into staging

s390x fixes and cleanups; also related fixes in xtensa,
arm, and x86 code

# gpg: Signature made Thu 20 May 2021 13:23:15 BST
# gpg:                using RSA key C3D0D66DC3624FF6A8C018CEDECF6B93C6F02FAF
# gpg:                issuer "cohuck@redhat.com"
# gpg: Good signature from "Cornelia Huck <conny@cornelia-huck.de>" [unknown]
# gpg:                 aka "Cornelia Huck <huckc@linux.vnet.ibm.com>" [full]
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>" [full]
# gpg:                 aka "Cornelia Huck <cohuck@kernel.org>" [unknown]
# gpg:                 aka "Cornelia Huck <cohuck@redhat.com>" [unknown]
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck-gitlab/tags/s390x-20210520-v2:
  tests/tcg/x86_64: add vsyscall smoke test
  target/i386: Make sure that vsyscall's tb->size != 0
  vfio-ccw: Attempt to clean up all IRQs on error
  hw/s390x/ccw: Register qbus type in abstract TYPE_CCW_DEVICE parent
  vfio-ccw: Permit missing IRQs
  accel/tcg: Assert that tb->size != 0 after translation
  target/xtensa: Make sure that tb->size != 0
  target/arm: Make sure that commpage's tb->size != 0
  target/s390x: Fix translation exception on illegal instruction

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

6 files changed, 13 insertions, 11 deletions

diff --git a/hw/s390x/3270-ccw.c b/hw/s390x/3270-ccw.c
index 25e628f..13e93d8 100644
--- a/hw/s390x/3270-ccw.c
+++ b/hw/s390x/3270-ccw.c
@@ -158,7 +158,6 @@ static void emulated_ccw_3270_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     device_class_set_props(dc, emulated_ccw_3270_properties);
-    dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
     dc->realize = emulated_ccw_3270_realize;
     dc->hotpluggable = false;
     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
diff --git a/hw/s390x/ccw-device.c b/hw/s390x/ccw-device.c
index c970711..95f269a 100644
--- a/hw/s390x/ccw-device.c
+++ b/hw/s390x/ccw-device.c
@@ -59,6 +59,7 @@ static void ccw_device_class_init(ObjectClass *klass, void *data)
     k->refill_ids = ccw_device_refill_ids;
     device_class_set_props(dc, ccw_device_properties);
     dc->reset = ccw_device_reset;
+    dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
 }
 
 const VMStateDescription vmstate_ccw_dev = {
diff --git a/hw/s390x/ccw-device.h b/hw/s390x/ccw-device.h
index 832c78c..6dff952 100644
--- a/hw/s390x/ccw-device.h
+++ b/hw/s390x/ccw-device.h
@@ -14,6 +14,7 @@
 #include "qom/object.h"
 #include "hw/qdev-core.h"
 #include "hw/s390x/css.h"
+#include "hw/s390x/css-bridge.h"
 
 struct CcwDevice {
     DeviceState parent_obj;
diff --git a/hw/s390x/s390-ccw.c b/hw/s390x/s390-ccw.c
index 242491a..c227c77 100644
--- a/hw/s390x/s390-ccw.c
+++ b/hw/s390x/s390-ccw.c
@@ -176,10 +176,8 @@ static void s390_ccw_instance_init(Object *obj)
 
 static void s390_ccw_class_init(ObjectClass *klass, void *data)
 {
-    DeviceClass *dc = DEVICE_CLASS(klass);
     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 
-    dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
     cdc->realize = s390_ccw_realize;
     cdc->unrealize = s390_ccw_unrealize;
 }
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 92b950e..220b9ef 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1234,7 +1234,6 @@ static void virtio_ccw_device_class_init(ObjectClass *klass, void *data)
     k->unplug = virtio_ccw_busdev_unplug;
     dc->realize = virtio_ccw_busdev_realize;
     dc->unrealize = virtio_ccw_busdev_unrealize;
-    dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
     device_class_set_parent_reset(dc, virtio_ccw_reset, &vdc->parent_reset);
 }
 
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index e752c84..139a3d9 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -411,8 +411,8 @@ static void vfio_ccw_register_irq_notifier(VFIOCCWDevice *vcdev,
     }
 
     if (vdev->num_irqs < irq + 1) {
-        error_setg(errp, "vfio: unexpected number of irqs %u",
-                   vdev->num_irqs);
+        error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)",
+                   irq, vdev->num_irqs);
         return;
     }
 
@@ -469,7 +469,7 @@ static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice *vcdev,
 
     if (vfio_set_irq_signaling(&vcdev->vdev, irq, 0,
                                VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
-        error_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
+        warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
     }
 
     qemu_set_fd_handler(event_notifier_get_fd(notifier),
@@ -689,20 +689,24 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
     if (vcdev->crw_region) {
         vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX, &err);
         if (err) {
-            goto out_crw_notifier_err;
+            goto out_irq_notifier_err;
         }
     }
 
     vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX, &err);
     if (err) {
-        goto out_req_notifier_err;
+        /*
+         * Report this error, but do not make it a failing condition.
+         * Lack of this IRQ in the host does not prevent normal operation.
+         */
+        error_report_err(err);
     }
 
     return;
 
-out_req_notifier_err:
+out_irq_notifier_err:
+    vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
-out_crw_notifier_err:
     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
 out_io_notifier_err:
     vfio_ccw_put_region(vcdev);