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From 3e04367b75615f4b1b53350b875c5c14b68dc785 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Wed, 6 Nov 2013 14:41:12 +0100
Subject: [PATCH 36/81] qdev: Replace no_user by cannot_instantiate_with_device_add_yet

RH-Author: Kevin Wolf <kwolf@redhat.com>
Message-id: <1383748882-22831-8-git-send-email-kwolf@redhat.com>
Patchwork-id: 55533
O-Subject: [RHEL-7.0 qemu-kvm PATCH v2 07/17] qdev: Replace no_user by cannot_instantiate_with_device_add_yet
Bugzilla: 1001216
RH-Acked-by: Marcel Apfelbaum <marcel.a@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>

From: Markus Armbruster <armbru@redhat.com>

In an ideal world, machines can be built by wiring devices together
with configuration, not code.  Unfortunately, that's not the world we
live in right now.  We still have quite a few devices that need to be
wired up by code.  If you try to device_add such a device, it'll fail
in sometimes mysterious ways.  If you're lucky, you get an
unmysterious immediate crash.

To protect users from such badness, DeviceClass member no_user used to
make device models unavailable with -device / device_add, but that
regressed in commit 18b6dad.  The device model is still omitted from
help, but is available anyway.

Attempts to fix the regression have been rejected with the argument
that the purpose of no_user isn't clear, and it's prone to misuse.

This commit clarifies no_user's purpose.  Anthony suggested to rename
it cannot_instantiate_with_device_add_yet_due_to_internal_bugs, which
I shorten somewhat to keep checkpatch happy.  While there, make it
bool.

Every use of cannot_instantiate_with_device_add_yet gets a FIXME
comment asking for rationale.  The next few commits will clean them
all up, either by providing a rationale, or by getting rid of the use.

With that done, the regression fix is hopefully acceptable.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel.a@redhat.com>
(cherry picked from pending upstream submission)

Conflicts:
	hw/dma/pl080.c
	hw/i386/kvm/clock.c
	hw/i386/pc.c
	hw/input/pckbd.c
	hw/input/vmmouse.c
	hw/misc/vmport.c
	hw/nvram/fw_cfg.c
	hw/pci-host/piix.c
	hw/timer/hpet.c
	hw/timer/m48t59.c
	hw/timer/mc146818rtc.c

A few more semantic conflicts elsewhere.  Conflict resolution is
always the same: replace just no_user, keep context intact.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/acpi/piix4.c            |  2 +-
 hw/alpha/typhoon.c         |  2 +-
 hw/arm/versatilepb.c       |  2 +-
 hw/audio/pcspk.c           |  2 +-
 hw/audio/pl041.c           |  2 +-
 hw/block/fdc.c             |  2 +-
 hw/display/pl110.c         |  6 +++---
 hw/dma/pl080.c             |  4 ++--
 hw/i2c/smbus_ich9.c        |  2 +-
 hw/i386/kvm/clock.c        |  2 +-
 hw/i386/kvmvapic.c         |  2 +-
 hw/i386/pc.c               |  2 +-
 hw/ide/piix.c              |  6 +++---
 hw/ide/via.c               |  2 +-
 hw/input/pckbd.c           |  2 +-
 hw/input/vmmouse.c         |  2 +-
 hw/intc/apic_common.c      |  2 +-
 hw/intc/arm_gic.c          |  2 +-
 hw/intc/arm_gic_common.c   |  2 +-
 hw/intc/arm_gic_kvm.c      |  2 +-
 hw/intc/i8259_common.c     |  2 +-
 hw/intc/ioapic_common.c    |  2 +-
 hw/intc/pl190.c            |  2 +-
 hw/isa/isa-bus.c           |  2 +-
 hw/isa/lpc_ich9.c          |  2 +-
 hw/isa/piix4.c             |  2 +-
 hw/isa/vt82c686.c          |  2 +-
 hw/misc/arm_l2x0.c         |  2 +-
 hw/misc/pvpanic.c          |  2 +-
 hw/misc/vmport.c           |  2 +-
 hw/nvram/fw_cfg.c          |  2 +-
 hw/pci-host/bonito.c       |  4 ++--
 hw/pci-host/grackle.c      |  4 ++--
 hw/pci-host/piix.c         |  8 ++++----
 hw/pci-host/prep.c         |  4 ++--
 hw/ppc/spapr_vio.c         |  2 +-
 hw/s390x/ipl.c             |  2 +-
 hw/s390x/s390-virtio-bus.c |  2 +-
 hw/s390x/virtio-ccw.c      |  2 +-
 hw/sd/pl181.c              |  2 +-
 hw/timer/arm_mptimer.c     |  2 +-
 hw/timer/hpet.c            |  2 +-
 hw/timer/i8254_common.c    |  2 +-
 hw/timer/m48t59.c          |  2 +-
 hw/timer/mc146818rtc.c     |  2 +-
 hw/timer/pl031.c           |  2 +-
 include/hw/qdev-core.h     | 13 ++++++++++++-
 qdev-monitor.c             |  5 +++--
 qom/cpu.c                  |  2 +-
 49 files changed, 73 insertions(+), 61 deletions(-)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/acpi/piix4.c            |    2 +-
 hw/alpha/typhoon.c         |    2 +-
 hw/arm/versatilepb.c       |    2 +-
 hw/audio/pcspk.c           |    2 +-
 hw/audio/pl041.c           |    2 +-
 hw/block/fdc.c             |    2 +-
 hw/display/pl110.c         |    6 +++---
 hw/dma/pl080.c             |    4 ++--
 hw/i2c/smbus_ich9.c        |    2 +-
 hw/i386/kvm/clock.c        |    2 +-
 hw/i386/kvmvapic.c         |    2 +-
 hw/i386/pc.c               |    2 +-
 hw/ide/piix.c              |    6 +++---
 hw/ide/via.c               |    2 +-
 hw/input/pckbd.c           |    2 +-
 hw/input/vmmouse.c         |    2 +-
 hw/intc/apic_common.c      |    2 +-
 hw/intc/arm_gic.c          |    2 +-
 hw/intc/arm_gic_common.c   |    2 +-
 hw/intc/arm_gic_kvm.c      |    2 +-
 hw/intc/i8259_common.c     |    2 +-
 hw/intc/ioapic_common.c    |    2 +-
 hw/intc/pl190.c            |    2 +-
 hw/isa/isa-bus.c           |    2 +-
 hw/isa/lpc_ich9.c          |    2 +-
 hw/isa/piix4.c             |    2 +-
 hw/isa/vt82c686.c          |    2 +-
 hw/misc/arm_l2x0.c         |    2 +-
 hw/misc/pvpanic.c          |    2 +-
 hw/misc/vmport.c           |    2 +-
 hw/nvram/fw_cfg.c          |    2 +-
 hw/pci-host/bonito.c       |    4 ++--
 hw/pci-host/grackle.c      |    4 ++--
 hw/pci-host/piix.c         |    8 ++++----
 hw/pci-host/prep.c         |    4 ++--
 hw/ppc/spapr_vio.c         |    2 +-
 hw/s390x/ipl.c             |    2 +-
 hw/s390x/s390-virtio-bus.c |    2 +-
 hw/s390x/virtio-ccw.c      |    2 +-
 hw/sd/pl181.c              |    2 +-
 hw/timer/arm_mptimer.c     |    2 +-
 hw/timer/hpet.c            |    2 +-
 hw/timer/i8254_common.c    |    2 +-
 hw/timer/m48t59.c          |    2 +-
 hw/timer/mc146818rtc.c     |    2 +-
 hw/timer/pl031.c           |    2 +-
 include/hw/qdev-core.h     |   13 ++++++++++++-
 qdev-monitor.c             |    5 +++--
 qom/cpu.c                  |    2 +-
 49 files changed, 73 insertions(+), 61 deletions(-)

diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index f14867a..46685b7 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -494,7 +494,7 @@ static void piix4_pm_class_init(ObjectClass *klass, void *data)
     k->revision = 0x03;
     k->class_id = PCI_CLASS_BRIDGE_OTHER;
     dc->desc = "PM";
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_acpi;
     dc->props = piix4_pm_properties;
 }
diff --git a/hw/alpha/typhoon.c b/hw/alpha/typhoon.c
index 1ead187..55a0e76 100644
--- a/hw/alpha/typhoon.c
+++ b/hw/alpha/typhoon.c
@@ -823,7 +823,7 @@ static void typhoon_pcihost_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = typhoon_pcihost_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo typhoon_pcihost_info = {
diff --git a/hw/arm/versatilepb.c b/hw/arm/versatilepb.c
index 753757e..84cd1ed 100644
--- a/hw/arm/versatilepb.c
+++ b/hw/arm/versatilepb.c
@@ -387,7 +387,7 @@ static void vpb_sic_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = vpb_sic_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_vpb_sic;
 }
 
diff --git a/hw/audio/pcspk.c b/hw/audio/pcspk.c
index 4e03bc9..9186304 100644
--- a/hw/audio/pcspk.c
+++ b/hw/audio/pcspk.c
@@ -188,7 +188,7 @@ static void pcspk_class_initfn(ObjectClass *klass, void *data)
 
     ic->init = pcspk_initfn;
     set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->props = pcspk_properties;
 }
 
diff --git a/hw/audio/pl041.c b/hw/audio/pl041.c
index 9b11cc9..36a7ecb 100644
--- a/hw/audio/pl041.c
+++ b/hw/audio/pl041.c
@@ -627,7 +627,7 @@ static void pl041_device_class_init(ObjectClass *klass, void *data)
 
     k->init = pl041_init;
     set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->reset = pl041_device_reset;
     dc->vmsd = &vmstate_pl041;
     dc->props = pl041_device_properties;
diff --git a/hw/block/fdc.c b/hw/block/fdc.c
index e292f4c..1524e09 100644
--- a/hw/block/fdc.c
+++ b/hw/block/fdc.c
@@ -2206,7 +2206,7 @@ static void isabus_fdc_class_init(ObjectClass *klass, void *data)
     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
     ic->init = isabus_fdc_init1;
     dc->fw_name = "fdc";
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->reset = fdctrl_external_reset_isa;
     dc->vmsd = &vmstate_isa_fdc;
     dc->props = isa_fdc_properties;
diff --git a/hw/display/pl110.c b/hw/display/pl110.c
index b45a7be..173ddf8 100644
--- a/hw/display/pl110.c
+++ b/hw/display/pl110.c
@@ -482,7 +482,7 @@ static void pl110_class_init(ObjectClass *klass, void *data)
 
     k->init = pl110_init;
     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_pl110;
 }
 
@@ -500,7 +500,7 @@ static void pl110_versatile_class_init(ObjectClass *klass, void *data)
 
     k->init = pl110_versatile_init;
     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_pl110;
 }
 
@@ -518,7 +518,7 @@ static void pl111_class_init(ObjectClass *klass, void *data)
 
     k->init = pl111_init;
     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_pl110;
 }
 
diff --git a/hw/dma/pl080.c b/hw/dma/pl080.c
index 00b66b4..2920780 100644
--- a/hw/dma/pl080.c
+++ b/hw/dma/pl080.c
@@ -382,7 +382,7 @@ static void pl080_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = pl080_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_pl080;
 }
 
@@ -399,7 +399,7 @@ static void pl081_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = pl081_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_pl080;
 }
 
diff --git a/hw/i2c/smbus_ich9.c b/hw/i2c/smbus_ich9.c
index ca22978..c1ffa34 100644
--- a/hw/i2c/smbus_ich9.c
+++ b/hw/i2c/smbus_ich9.c
@@ -97,7 +97,7 @@ static void ich9_smb_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_INTEL_ICH9_6;
     k->revision = ICH9_A2_SMB_REVISION;
     k->class_id = PCI_CLASS_SERIAL_SMBUS;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_ich9_smbus;
     dc->desc = "ICH9 SMBUS Bridge";
     k->init = ich9_smbus_initfn;
diff --git a/hw/i386/kvm/clock.c b/hw/i386/kvm/clock.c
index 98e5ca5..6204939 100644
--- a/hw/i386/kvm/clock.c
+++ b/hw/i386/kvm/clock.c
@@ -110,7 +110,7 @@ static void kvmclock_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = kvmclock_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &kvmclock_vmsd;
 }
 
diff --git a/hw/i386/kvmvapic.c b/hw/i386/kvmvapic.c
index 655483b..e6405da 100644
--- a/hw/i386/kvmvapic.c
+++ b/hw/i386/kvmvapic.c
@@ -809,7 +809,7 @@ static void vapic_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *sc = SYS_BUS_DEVICE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
 
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->reset   = vapic_reset;
     dc->vmsd    = &vmstate_vapic;
     sc->init    = vapic_init;
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index d3acbbb..0a8840a 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -538,7 +538,7 @@ static void port92_class_initfn(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
     ic->init = port92_initfn;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->reset = port92_reset;
     dc->vmsd = &vmstate_port92_isa;
 }
diff --git a/hw/ide/piix.c b/hw/ide/piix.c
index 8d4bf2f..e6864b1 100644
--- a/hw/ide/piix.c
+++ b/hw/ide/piix.c
@@ -249,7 +249,7 @@ static void piix3_ide_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_INTEL_82371SB_1;
     k->class_id = PCI_CLASS_STORAGE_IDE;
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo piix3_ide_info = {
@@ -269,7 +269,7 @@ static void piix3_ide_xen_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_INTEL_82371SB_1;
     k->class_id = PCI_CLASS_STORAGE_IDE;
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->unplug = pci_piix3_xen_ide_unplug;
 }
 
@@ -292,7 +292,7 @@ static void piix4_ide_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_INTEL_82371AB;
     k->class_id = PCI_CLASS_STORAGE_IDE;
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo piix4_ide_info = {
diff --git a/hw/ide/via.c b/hw/ide/via.c
index 30dedd8..6ba99c8 100644
--- a/hw/ide/via.c
+++ b/hw/ide/via.c
@@ -224,7 +224,7 @@ static void via_ide_class_init(ObjectClass *klass, void *data)
     k->revision = 0x06;
     k->class_id = PCI_CLASS_STORAGE_IDE;
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo via_ide_info = {
diff --git a/hw/input/pckbd.c b/hw/input/pckbd.c
index 17a5614..98b8b15 100644
--- a/hw/input/pckbd.c
+++ b/hw/input/pckbd.c
@@ -514,7 +514,7 @@ static void i8042_class_initfn(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
     ic->init = i8042_initfn;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_kbd_isa;
 }
 
diff --git a/hw/input/vmmouse.c b/hw/input/vmmouse.c
index a610738..c9d5131 100644
--- a/hw/input/vmmouse.c
+++ b/hw/input/vmmouse.c
@@ -284,7 +284,7 @@ static void vmmouse_class_initfn(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
     ic->init = vmmouse_initfn;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->reset = vmmouse_reset;
     dc->vmsd = &vmstate_vmmouse;
     dc->props = vmmouse_properties;
diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index b03e904..208e7b1 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -386,7 +386,7 @@ static void apic_common_class_init(ObjectClass *klass, void *data)
 
     dc->vmsd = &vmstate_apic_common;
     dc->reset = apic_reset_common;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->props = apic_properties_common;
     idc->init = apic_init_common;
 }
diff --git a/hw/intc/arm_gic.c b/hw/intc/arm_gic.c
index bae6572..243cbf1 100644
--- a/hw/intc/arm_gic.c
+++ b/hw/intc/arm_gic.c
@@ -702,7 +702,7 @@ static void arm_gic_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     ARMGICClass *agc = ARM_GIC_CLASS(klass);
 
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     agc->parent_realize = dc->realize;
     dc->realize = arm_gic_realize;
 }
diff --git a/hw/intc/arm_gic_common.c b/hw/intc/arm_gic_common.c
index 08560f2..26b7756 100644
--- a/hw/intc/arm_gic_common.c
+++ b/hw/intc/arm_gic_common.c
@@ -156,7 +156,7 @@ static void arm_gic_common_class_init(ObjectClass *klass, void *data)
     dc->realize = arm_gic_common_realize;
     dc->props = arm_gic_common_properties;
     dc->vmsd = &vmstate_gic;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo arm_gic_common_type = {
diff --git a/hw/intc/arm_gic_kvm.c b/hw/intc/arm_gic_kvm.c
index b756456..cb4ce23 100644
--- a/hw/intc/arm_gic_kvm.c
+++ b/hw/intc/arm_gic_kvm.c
@@ -148,7 +148,7 @@ static void kvm_arm_gic_class_init(ObjectClass *klass, void *data)
     kgc->parent_reset = dc->reset;
     dc->realize = kvm_arm_gic_realize;
     dc->reset = kvm_arm_gic_reset;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo kvm_arm_gic_info = {
diff --git a/hw/intc/i8259_common.c b/hw/intc/i8259_common.c
index c2ba6a5..70868a5 100644
--- a/hw/intc/i8259_common.c
+++ b/hw/intc/i8259_common.c
@@ -139,7 +139,7 @@ static void pic_common_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->vmsd = &vmstate_pic_common;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->props = pic_properties_common;
     ic->init = pic_init_common;
 }
diff --git a/hw/intc/ioapic_common.c b/hw/intc/ioapic_common.c
index 5c5bb3c..ce610b7 100644
--- a/hw/intc/ioapic_common.c
+++ b/hw/intc/ioapic_common.c
@@ -100,7 +100,7 @@ static void ioapic_common_class_init(ObjectClass *klass, void *data)
 
     sc->init = ioapic_init_common;
     dc->vmsd = &vmstate_ioapic_common;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo ioapic_common_type = {
diff --git a/hw/intc/pl190.c b/hw/intc/pl190.c
index 9610673..ff0e5b0 100644
--- a/hw/intc/pl190.c
+++ b/hw/intc/pl190.c
@@ -269,7 +269,7 @@ static void pl190_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = pl190_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->reset = pl190_reset;
     dc->vmsd = &vmstate_pl190;
 }
diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c
index 7860b17..a87a841 100644
--- a/hw/isa/isa-bus.c
+++ b/hw/isa/isa-bus.c
@@ -217,7 +217,7 @@ static void isabus_bridge_class_init(ObjectClass *klass, void *data)
 
     k->init = isabus_bridge_init;
     dc->fw_name = "isa";
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo isabus_bridge_info = {
diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c
index 2760dce..580e9ac 100644
--- a/hw/isa/lpc_ich9.c
+++ b/hw/isa/lpc_ich9.c
@@ -603,7 +603,7 @@ static void ich9_lpc_class_init(ObjectClass *klass, void *data)
     dc->reset = ich9_lpc_reset;
     k->init = ich9_lpc_initfn;
     dc->vmsd = &vmstate_ich9_lpc;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     k->config_write = ich9_lpc_config_write;
     dc->desc = "ICH9 LPC bridge";
     k->vendor_id = PCI_VENDOR_ID_INTEL;
diff --git a/hw/isa/piix4.c b/hw/isa/piix4.c
index d750413..10bf8ff 100644
--- a/hw/isa/piix4.c
+++ b/hw/isa/piix4.c
@@ -113,7 +113,7 @@ static void piix4_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_INTEL_82371AB_0;
     k->class_id = PCI_CLASS_BRIDGE_ISA;
     dc->desc = "ISA bridge";
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_piix4;
 }
 
diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index 79057a6..563e154 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -468,7 +468,7 @@ static void via_class_init(ObjectClass *klass, void *data)
     k->class_id = PCI_CLASS_BRIDGE_ISA;
     k->revision = 0x40;
     dc->desc = "ISA bridge";
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_via;
 }
 
diff --git a/hw/misc/arm_l2x0.c b/hw/misc/arm_l2x0.c
index eb4427d..2b19e34 100644
--- a/hw/misc/arm_l2x0.c
+++ b/hw/misc/arm_l2x0.c
@@ -174,7 +174,7 @@ static void l2x0_class_init(ObjectClass *klass, void *data)
 
     k->init = l2x0_priv_init;
     dc->vmsd = &vmstate_l2x0;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->props = l2x0_properties;
     dc->reset = l2x0_priv_reset;
 }
diff --git a/hw/misc/pvpanic.c b/hw/misc/pvpanic.c
index 31e1b1d..af4a8b2 100644
--- a/hw/misc/pvpanic.c
+++ b/hw/misc/pvpanic.c
@@ -125,7 +125,7 @@ static void pvpanic_isa_class_init(ObjectClass *klass, void *data)
     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
 
     ic->init = pvpanic_isa_initfn;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->props = pvpanic_isa_properties;
 }
 
diff --git a/hw/misc/vmport.c b/hw/misc/vmport.c
index c146129..ab7adf1 100644
--- a/hw/misc/vmport.c
+++ b/hw/misc/vmport.c
@@ -156,7 +156,7 @@ static void vmport_class_initfn(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
     ic->init = vmport_initfn;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo vmport_info = {
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 1a7e49c..155edd4 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -559,7 +559,7 @@ static void fw_cfg_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = fw_cfg_init1;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->reset = fw_cfg_reset;
     dc->vmsd = &vmstate_fw_cfg;
     dc->props = fw_cfg_properties;
diff --git a/hw/pci-host/bonito.c b/hw/pci-host/bonito.c
index 974150b..b73359e 100644
--- a/hw/pci-host/bonito.c
+++ b/hw/pci-host/bonito.c
@@ -811,7 +811,7 @@ static void bonito_class_init(ObjectClass *klass, void *data)
     k->revision = 0x01;
     k->class_id = PCI_CLASS_BRIDGE_HOST;
     dc->desc = "Host bridge";
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_bonito;
 }
 
@@ -828,7 +828,7 @@ static void bonito_pcihost_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = bonito_pcihost_initfn;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo bonito_pcihost_info = {
diff --git a/hw/pci-host/grackle.c b/hw/pci-host/grackle.c
index 69344d9..5eb2840 100644
--- a/hw/pci-host/grackle.c
+++ b/hw/pci-host/grackle.c
@@ -130,7 +130,7 @@ static void grackle_pci_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_MOTOROLA_MPC106;
     k->revision  = 0x00;
     k->class_id  = PCI_CLASS_BRIDGE_HOST;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo grackle_pci_info = {
@@ -146,7 +146,7 @@ static void pci_grackle_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     k->init = pci_grackle_init_device;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo grackle_pci_host_info = {
diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index f9e68c3..b9c2dcf 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -564,7 +564,7 @@ static void piix3_class_init(ObjectClass *klass, void *data)
 
     dc->desc        = "ISA bridge";
     dc->vmsd        = &vmstate_piix3;
-    dc->no_user     = 1,
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     k->no_hotplug   = 1;
     k->init         = piix3_initfn;
     k->config_write = piix3_write_config;
@@ -588,7 +588,7 @@ static void piix3_xen_class_init(ObjectClass *klass, void *data)
 
     dc->desc        = "ISA bridge";
     dc->vmsd        = &vmstate_piix3;
-    dc->no_user     = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     k->no_hotplug   = 1;
     k->init         = piix3_initfn;
     k->config_write = piix3_write_config_xen;
@@ -618,7 +618,7 @@ static void i440fx_class_init(ObjectClass *klass, void *data)
     k->revision = 0x02;
     k->class_id = PCI_CLASS_BRIDGE_HOST;
     dc->desc = "Host bridge";
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_i440fx;
 }
 
@@ -636,7 +636,7 @@ static void i440fx_pcihost_class_init(ObjectClass *klass, void *data)
 
     k->init = i440fx_pcihost_initfn;
     dc->fw_name = "pci";
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo i440fx_pcihost_info = {
diff --git a/hw/pci-host/prep.c b/hw/pci-host/prep.c
index 8c4e6eb..eec538e 100644
--- a/hw/pci-host/prep.c
+++ b/hw/pci-host/prep.c
@@ -196,7 +196,7 @@ static void raven_class_init(ObjectClass *klass, void *data)
     k->class_id = PCI_CLASS_BRIDGE_HOST;
     dc->desc = "PReP Host Bridge - Motorola Raven";
     dc->vmsd = &vmstate_raven;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo raven_info = {
@@ -213,7 +213,7 @@ static void raven_pcihost_class_init(ObjectClass *klass, void *data)
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
     dc->realize = raven_pcihost_realizefn;
     dc->fw_name = "pci";
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo raven_pcihost_info = {
diff --git a/hw/ppc/spapr_vio.c b/hw/ppc/spapr_vio.c
index 1405c32..42b6367 100644
--- a/hw/ppc/spapr_vio.c
+++ b/hw/ppc/spapr_vio.c
@@ -533,7 +533,7 @@ static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = spapr_vio_bridge_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo spapr_vio_bridge_info = {
diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
index d69adb2..f86a4af 100644
--- a/hw/s390x/ipl.c
+++ b/hw/s390x/ipl.c
@@ -181,7 +181,7 @@ static void s390_ipl_class_init(ObjectClass *klass, void *data)
     k->init = s390_ipl_init;
     dc->props = s390_ipl_properties;
     dc->reset = s390_ipl_reset;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo s390_ipl_info = {
diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c
index 207eb82..9078bfb 100644
--- a/hw/s390x/s390-virtio-bus.c
+++ b/hw/s390x/s390-virtio-bus.c
@@ -679,7 +679,7 @@ static void s390_virtio_bridge_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = s390_virtio_bridge_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo s390_virtio_bridge_info = {
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index de51589..74eb559 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1075,7 +1075,7 @@ static void virtual_css_bridge_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = virtual_css_bridge_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo virtual_css_bridge_info = {
diff --git a/hw/sd/pl181.c b/hw/sd/pl181.c
index 2527296..95e4587 100644
--- a/hw/sd/pl181.c
+++ b/hw/sd/pl181.c
@@ -497,7 +497,7 @@ static void pl181_class_init(ObjectClass *klass, void *data)
     sdc->init = pl181_init;
     k->vmsd = &vmstate_pl181;
     k->reset = pl181_reset;
-    k->no_user = 1;
+    k->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo pl181_info = {
diff --git a/hw/timer/arm_mptimer.c b/hw/timer/arm_mptimer.c
index 317f5e4..6b088fa 100644
--- a/hw/timer/arm_mptimer.c
+++ b/hw/timer/arm_mptimer.c
@@ -290,7 +290,7 @@ static void arm_mptimer_class_init(ObjectClass *klass, void *data)
     sbc->init = arm_mptimer_init;
     dc->vmsd = &vmstate_arm_mptimer;
     dc->reset = arm_mptimer_reset;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->props = arm_mptimer_properties;
 }
 
diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c
index 95dd01d..3f7f457 100644
--- a/hw/timer/hpet.c
+++ b/hw/timer/hpet.c
@@ -739,7 +739,7 @@ static void hpet_device_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = hpet_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->reset = hpet_reset;
     dc->vmsd = &vmstate_hpet;
     dc->props = hpet_device_properties;
diff --git a/hw/timer/i8254_common.c b/hw/timer/i8254_common.c
index f6f9d26..8f01313 100644
--- a/hw/timer/i8254_common.c
+++ b/hw/timer/i8254_common.c
@@ -291,7 +291,7 @@ static void pit_common_class_init(ObjectClass *klass, void *data)
 
     ic->init = pit_init_common;
     dc->vmsd = &vmstate_pit_common;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo pit_common_type = {
diff --git a/hw/timer/m48t59.c b/hw/timer/m48t59.c
index 45753d8..e536bb9 100644
--- a/hw/timer/m48t59.c
+++ b/hw/timer/m48t59.c
@@ -740,7 +740,7 @@ static void m48t59_isa_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
     ic->init = m48t59_init_isa1;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->reset = m48t59_reset_isa;
     dc->props = m48t59_isa_properties;
 }
diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c
index 481604d..7a70556 100644
--- a/hw/timer/mc146818rtc.c
+++ b/hw/timer/mc146818rtc.c
@@ -904,7 +904,7 @@ static void rtc_class_initfn(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
     ic->init = rtc_initfn;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_rtc;
     dc->props = mc146818rtc_properties;
 }
diff --git a/hw/timer/pl031.c b/hw/timer/pl031.c
index 764940b..aa9c5a6 100644
--- a/hw/timer/pl031.c
+++ b/hw/timer/pl031.c
@@ -246,7 +246,7 @@ static void pl031_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = pl031_init;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_pl031;
 }
 
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index a8618db..44feb54 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -97,7 +97,18 @@ typedef struct DeviceClass {
     const char *fw_name;
     const char *desc;
     Property *props;
-    int no_user;
+
+    /*
+     * Shall we hide this device model from -device / device_add?
+     * All devices should support instantiation with device_add, and
+     * this flag should not exist.  But we're not there, yet.  Some
+     * devices fail to instantiate with cryptic error messages.
+     * Others instantiate, but don't work.  Exposing users to such
+     * behavior would be cruel; this flag serves to protect them.  It
+     * should never be set without a comment explaining why it is set.
+     * TODO remove once we're there
+     */
+    bool cannot_instantiate_with_device_add_yet;
 
     /* callbacks */
     void (*reset)(DeviceState *dev);
diff --git a/qdev-monitor.c b/qdev-monitor.c
index aa6a261..f54cb21 100644
--- a/qdev-monitor.c
+++ b/qdev-monitor.c
@@ -87,7 +87,7 @@ static void qdev_print_devinfo(DeviceClass *dc)
     if (dc->desc) {
         error_printf(", desc \"%s\"", dc->desc);
     }
-    if (dc->no_user) {
+    if (dc->cannot_instantiate_with_device_add_yet) {
         error_printf(", no-user");
     }
     error_printf("\n");
@@ -127,7 +127,8 @@ static void qdev_print_devinfos(bool show_no_user)
             if ((i < DEVICE_CATEGORY_MAX
                  ? !test_bit(i, dc->categories)
                  : !bitmap_empty(dc->categories, DEVICE_CATEGORY_MAX))
-                || (!show_no_user && dc->no_user)) {
+                || (!show_no_user
+                    && dc->cannot_instantiate_with_device_add_yet)) {
                 continue;
             }
             if (!cat_printed) {
diff --git a/qom/cpu.c b/qom/cpu.c
index b25fbc9..f97e1b8 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -210,7 +210,7 @@ static void cpu_class_init(ObjectClass *klass, void *data)
     k->write_elf64_qemunote = cpu_common_write_elf64_qemunote;
     k->write_elf64_note = cpu_common_write_elf64_note;
     dc->realize = cpu_common_realizefn;
-    dc->no_user = 1;
+    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo cpu_type_info = {
-- 
1.7.1