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Add the VMBus infrastructure -- bus, devices, root bridge, vmbus state machine, vmbus channel interactions, etc. VMBus is a collection of technologies. At its lowest layer, it's a message passing and signaling mechanism, allowing efficient passing of messages to and from guest VMs. A layer higher, it's a mechanism for defining channels of communication, where each channel is tagged with a type (which implies a protocol) and a instance ID. A layer higher than that, it's a bus driver, serving as the basis of device enumeration within a VM, where a channel can optionally be exposed as a paravirtual device. When a server-side (paravirtual back-end) component wishes to offer a channel to a guest VM, it does so by specifying a channel type, a mode, and an instance ID. VMBus then exposes this in the guest. More information about VMBus can be found in the file vmbuskernelmodeclientlibapi.h in Microsoft's WDK. TODO: - split into smaller palatable pieces - more comments - check and handle corner cases Kudos to Evgeny Yakovlev (formerly eyakovlev@virtuozzo.com) and Andrey Smetatin (formerly asmetanin@virtuozzo.com) for research and prototyping. Signed-off-by: Roman Kagan <rkagan@virtuozzo.com> Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com> Signed-off-by: Jon Doron <arilou@gmail.com> Message-Id: <20200424123444.3481728-4-arilou@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
33 lines
709 B
C
33 lines
709 B
C
/*
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* QEMU Hyper-V VMBus root bridge
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*
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* Copyright (c) 2017-2018 Virtuozzo International GmbH.
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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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#ifndef HW_HYPERV_VMBUS_BRIDGE_H
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#define HW_HYPERV_VMBUS_BRIDGE_H
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#include "hw/sysbus.h"
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#define TYPE_VMBUS_BRIDGE "vmbus-bridge"
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typedef struct VMBus VMBus;
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typedef struct VMBusBridge {
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SysBusDevice parent_obj;
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VMBus *bus;
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} VMBusBridge;
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#define VMBUS_BRIDGE(obj) OBJECT_CHECK(VMBusBridge, (obj), TYPE_VMBUS_BRIDGE)
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static inline VMBusBridge *vmbus_bridge_find(void)
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{
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return VMBUS_BRIDGE(object_resolve_path_type("", TYPE_VMBUS_BRIDGE, NULL));
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}
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#endif
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