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efec3dd631
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>
Signed-off-by: Andreas Färber <afaerber@suse.de>
118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/*
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* IOAPIC emulation logic - common bits of emulated and KVM kernel model
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*
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* Copyright (c) 2004-2005 Fabrice Bellard
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* Copyright (c) 2009 Xiantao Zhang, Intel
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* Copyright (c) 2011 Jan Kiszka, Siemens AG
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hw/i386/ioapic.h"
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#include "hw/i386/ioapic_internal.h"
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#include "hw/sysbus.h"
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void ioapic_reset_common(DeviceState *dev)
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{
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IOAPICCommonState *s = IOAPIC_COMMON(dev);
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int i;
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s->id = 0;
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s->ioregsel = 0;
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s->irr = 0;
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for (i = 0; i < IOAPIC_NUM_PINS; i++) {
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s->ioredtbl[i] = 1 << IOAPIC_LVT_MASKED_SHIFT;
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}
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}
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static void ioapic_dispatch_pre_save(void *opaque)
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{
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IOAPICCommonState *s = IOAPIC_COMMON(opaque);
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IOAPICCommonClass *info = IOAPIC_COMMON_GET_CLASS(s);
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if (info->pre_save) {
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info->pre_save(s);
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}
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}
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static int ioapic_dispatch_post_load(void *opaque, int version_id)
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{
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IOAPICCommonState *s = IOAPIC_COMMON(opaque);
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IOAPICCommonClass *info = IOAPIC_COMMON_GET_CLASS(s);
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if (info->post_load) {
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info->post_load(s);
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}
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return 0;
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}
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static void ioapic_common_realize(DeviceState *dev, Error **errp)
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{
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IOAPICCommonState *s = IOAPIC_COMMON(dev);
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IOAPICCommonClass *info;
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static int ioapic_no;
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if (ioapic_no >= MAX_IOAPICS) {
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error_setg(errp, "Only %d ioapics allowed", MAX_IOAPICS);
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return;
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}
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info = IOAPIC_COMMON_GET_CLASS(s);
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info->init(s, ioapic_no);
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sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->io_memory);
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ioapic_no++;
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}
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static const VMStateDescription vmstate_ioapic_common = {
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.name = "ioapic",
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.version_id = 3,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.pre_save = ioapic_dispatch_pre_save,
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.post_load = ioapic_dispatch_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_UINT8(id, IOAPICCommonState),
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VMSTATE_UINT8(ioregsel, IOAPICCommonState),
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VMSTATE_UNUSED_V(2, 8), /* to account for qemu-kvm's v2 format */
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VMSTATE_UINT32_V(irr, IOAPICCommonState, 2),
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VMSTATE_UINT64_ARRAY(ioredtbl, IOAPICCommonState, IOAPIC_NUM_PINS),
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VMSTATE_END_OF_LIST()
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}
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};
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static void ioapic_common_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = ioapic_common_realize;
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dc->vmsd = &vmstate_ioapic_common;
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dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
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}
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static const TypeInfo ioapic_common_type = {
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.name = TYPE_IOAPIC_COMMON,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(IOAPICCommonState),
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.class_size = sizeof(IOAPICCommonClass),
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.class_init = ioapic_common_class_init,
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.abstract = true,
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};
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static void register_types(void)
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{
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type_register_static(&ioapic_common_type);
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}
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type_init(register_types)
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