88552b16f2
The VM coreinfo device does not sit on a bus, so it won't be reset automatically. This is why it calls qemu_register_reset(). Add a comment about it, so we don't convert its reset handler to a DeviceReset method. Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Li Qiang <liq3ea@gmail.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20191010131527.32513-9-philmd@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/*
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* Virtual Machine coreinfo device
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*
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* Copyright (C) 2017 Red Hat, Inc.
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*
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* Authors: Marc-André Lureau <marcandre.lureau@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "sysemu/reset.h"
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#include "hw/nvram/fw_cfg.h"
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#include "migration/vmstate.h"
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#include "hw/misc/vmcoreinfo.h"
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static void fw_cfg_vmci_write(void *dev, off_t offset, size_t len)
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{
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VMCoreInfoState *s = VMCOREINFO(dev);
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s->has_vmcoreinfo = offset == 0 && len == sizeof(s->vmcoreinfo)
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&& s->vmcoreinfo.guest_format != FW_CFG_VMCOREINFO_FORMAT_NONE;
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}
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static void vmcoreinfo_reset(void *dev)
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{
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VMCoreInfoState *s = VMCOREINFO(dev);
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s->has_vmcoreinfo = false;
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memset(&s->vmcoreinfo, 0, sizeof(s->vmcoreinfo));
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s->vmcoreinfo.host_format = cpu_to_le16(FW_CFG_VMCOREINFO_FORMAT_ELF);
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}
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static void vmcoreinfo_realize(DeviceState *dev, Error **errp)
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{
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VMCoreInfoState *s = VMCOREINFO(dev);
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FWCfgState *fw_cfg = fw_cfg_find();
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/* for gdb script dump-guest-memory.py */
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static VMCoreInfoState * volatile vmcoreinfo_state G_GNUC_UNUSED;
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/* Given that this function is executing, there is at least one VMCOREINFO
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* device. Check if there are several.
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*/
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if (!vmcoreinfo_find()) {
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error_setg(errp, "at most one %s device is permitted",
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VMCOREINFO_DEVICE);
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return;
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}
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if (!fw_cfg || !fw_cfg->dma_enabled) {
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error_setg(errp, "%s device requires fw_cfg with DMA",
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VMCOREINFO_DEVICE);
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return;
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}
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fw_cfg_add_file_callback(fw_cfg, FW_CFG_VMCOREINFO_FILENAME,
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NULL, fw_cfg_vmci_write, s,
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&s->vmcoreinfo, sizeof(s->vmcoreinfo), false);
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/*
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* This device requires to register a global reset because it is
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* not plugged to a bus (which, as its QOM parent, would reset it).
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*/
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qemu_register_reset(vmcoreinfo_reset, dev);
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vmcoreinfo_state = s;
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}
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static const VMStateDescription vmstate_vmcoreinfo = {
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.name = "vmcoreinfo",
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.version_id = 1,
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.minimum_version_id = 1,
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.fields = (VMStateField[]) {
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VMSTATE_BOOL(has_vmcoreinfo, VMCoreInfoState),
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VMSTATE_UINT16(vmcoreinfo.host_format, VMCoreInfoState),
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VMSTATE_UINT16(vmcoreinfo.guest_format, VMCoreInfoState),
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VMSTATE_UINT32(vmcoreinfo.size, VMCoreInfoState),
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VMSTATE_UINT64(vmcoreinfo.paddr, VMCoreInfoState),
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VMSTATE_END_OF_LIST()
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},
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};
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static void vmcoreinfo_device_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->vmsd = &vmstate_vmcoreinfo;
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dc->realize = vmcoreinfo_realize;
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dc->hotpluggable = false;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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}
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static const TypeInfo vmcoreinfo_device_info = {
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.name = VMCOREINFO_DEVICE,
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.parent = TYPE_DEVICE,
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.instance_size = sizeof(VMCoreInfoState),
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.class_init = vmcoreinfo_device_class_init,
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};
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static void vmcoreinfo_register_types(void)
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{
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type_register_static(&vmcoreinfo_device_info);
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}
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type_init(vmcoreinfo_register_types)
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