2044969f0b
Let's properly notify when (un)plugging blocks, after discarding memory and before allowing the guest to consume memory. Handle errors from notifiers gracefully (e.g., no remaining VFIO mappings) when plugging, rolling back the change and telling the guest that the VM is busy. One special case to take care of is replaying all notifications after restoring the vmstate. The device starts out with all memory discarded, so after loading the vmstate, we have to notify about all plugged blocks. Acked-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: Peter Xu <peterx@redhat.com> Cc: Auger Eric <eric.auger@redhat.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: teawater <teawaterz@linux.alibaba.com> Cc: Marek Kedzierski <mkedzier@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20210413095531.25603-6-david@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
/*
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* Virtio MEM device
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*
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* Copyright (C) 2020 Red Hat, Inc.
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*
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* Authors:
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* David Hildenbrand <david@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef HW_VIRTIO_MEM_H
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#define HW_VIRTIO_MEM_H
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#include "standard-headers/linux/virtio_mem.h"
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#include "hw/virtio/virtio.h"
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#include "qapi/qapi-types-misc.h"
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#include "sysemu/hostmem.h"
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#include "qom/object.h"
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#define TYPE_VIRTIO_MEM "virtio-mem"
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OBJECT_DECLARE_TYPE(VirtIOMEM, VirtIOMEMClass,
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VIRTIO_MEM)
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#define VIRTIO_MEM_MEMDEV_PROP "memdev"
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#define VIRTIO_MEM_NODE_PROP "node"
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#define VIRTIO_MEM_SIZE_PROP "size"
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#define VIRTIO_MEM_REQUESTED_SIZE_PROP "requested-size"
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#define VIRTIO_MEM_BLOCK_SIZE_PROP "block-size"
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#define VIRTIO_MEM_ADDR_PROP "memaddr"
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struct VirtIOMEM {
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VirtIODevice parent_obj;
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/* guest -> host request queue */
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VirtQueue *vq;
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/* bitmap used to track unplugged memory */
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int32_t bitmap_size;
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unsigned long *bitmap;
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/* assigned memory backend and memory region */
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HostMemoryBackend *memdev;
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/* NUMA node */
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uint32_t node;
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/* assigned address of the region in guest physical memory */
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uint64_t addr;
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/* usable region size (<= region_size) */
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uint64_t usable_region_size;
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/* actual size (how much the guest plugged) */
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uint64_t size;
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/* requested size */
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uint64_t requested_size;
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/* block size and alignment */
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uint64_t block_size;
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/* notifiers to notify when "size" changes */
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NotifierList size_change_notifiers;
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/* don't migrate unplugged memory */
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NotifierWithReturn precopy_notifier;
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/* listeners to notify on plug/unplug activity. */
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QLIST_HEAD(, RamDiscardListener) rdl_list;
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};
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struct VirtIOMEMClass {
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/* private */
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VirtIODevice parent;
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/* public */
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void (*fill_device_info)(const VirtIOMEM *vmen, VirtioMEMDeviceInfo *vi);
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MemoryRegion *(*get_memory_region)(VirtIOMEM *vmem, Error **errp);
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void (*add_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier);
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void (*remove_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier);
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};
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#endif
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