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c13c4153f7
The new feature enables the virtio-balloon device to receive hints of guest free pages from the free page vq. A notifier is registered to the migration precopy notifier chain. The notifier calls free_page_start after the migration thread syncs the dirty bitmap, so that the free page optimization starts to clear bits of free pages from the bitmap. It calls the free_page_stop before the migration thread syncs the bitmap, which is the end of the current round of ram save. The free_page_stop is also called to stop the optimization in the case when there is an error occurred in the process of ram saving. Note: balloon will report pages which were free at the time of this call. As the reporting happens asynchronously, dirty bit logging must be enabled before this free_page_start call is made. Guest reporting must be disabled before the migration dirty bitmap is synchronized. Signed-off-by: Wei Wang <wei.w.wang@intel.com> CC: Michael S. Tsirkin <mst@redhat.com> CC: Dr. David Alan Gilbert <dgilbert@redhat.com> CC: Juan Quintela <quintela@redhat.com> CC: Peter Xu <peterx@redhat.com> Message-Id: <1544516693-5395-8-git-send-email-wei.w.wang@intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> dgilbert: Dropped kernel header update, fixed up CMD_ID_* name change
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/*
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* Virtio Support
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*
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* Copyright IBM, Corp. 2007-2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Rusty Russell <rusty@rustcorp.com.au>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_VIRTIO_BALLOON_H
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#define QEMU_VIRTIO_BALLOON_H
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#include "standard-headers/linux/virtio_balloon.h"
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#include "hw/virtio/virtio.h"
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#include "sysemu/iothread.h"
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#define TYPE_VIRTIO_BALLOON "virtio-balloon-device"
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#define VIRTIO_BALLOON(obj) \
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OBJECT_CHECK(VirtIOBalloon, (obj), TYPE_VIRTIO_BALLOON)
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#define VIRTIO_BALLOON_FREE_PAGE_REPORT_CMD_ID_MIN 0x80000000
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typedef struct virtio_balloon_stat VirtIOBalloonStat;
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typedef struct virtio_balloon_stat_modern {
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uint16_t tag;
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uint8_t reserved[6];
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uint64_t val;
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} VirtIOBalloonStatModern;
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typedef struct PartiallyBalloonedPage PartiallyBalloonedPage;
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enum virtio_balloon_free_page_report_status {
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FREE_PAGE_REPORT_S_STOP = 0,
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FREE_PAGE_REPORT_S_REQUESTED = 1,
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FREE_PAGE_REPORT_S_START = 2,
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FREE_PAGE_REPORT_S_DONE = 3,
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};
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typedef struct VirtIOBalloon {
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VirtIODevice parent_obj;
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VirtQueue *ivq, *dvq, *svq, *free_page_vq;
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uint32_t free_page_report_status;
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uint32_t num_pages;
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uint32_t actual;
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uint32_t free_page_report_cmd_id;
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uint64_t stats[VIRTIO_BALLOON_S_NR];
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VirtQueueElement *stats_vq_elem;
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size_t stats_vq_offset;
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QEMUTimer *stats_timer;
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IOThread *iothread;
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QEMUBH *free_page_bh;
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/*
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* Lock to synchronize threads to access the free page reporting related
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* fields (e.g. free_page_report_status).
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*/
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QemuMutex free_page_lock;
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QemuCond free_page_cond;
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/*
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* Set to block iothread to continue reading free page hints as the VM is
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* stopped.
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*/
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bool block_iothread;
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NotifierWithReturn free_page_report_notify;
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int64_t stats_last_update;
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int64_t stats_poll_interval;
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uint32_t host_features;
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PartiallyBalloonedPage *pbp;
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} VirtIOBalloon;
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#endif
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