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qapi: Add HV_BALLOON_STATUS_REPORT event and its QMP query command

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Used by the hv-balloon driver for (optional) guest memory status reports.

Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
This commit is contained in:
Maciej S. Szmigiero 2023-08-23 23:34:14 +02:00
parent 16dff2f9bb
commit 259ebed45a
6 changed files with 113 additions and 2 deletions
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19
hw/hyperv/hv-balloon-stub.c Normal file
View file

@ -0,0 +1,19 @@
/*
* QEMU Hyper-V Dynamic Memory Protocol driver
*
* Copyright (C) 2023 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-machine.h"
#include "qapi/qapi-types-machine.h"
HvBalloonInfo *qmp_query_hv_balloon_status_report(Error **errp)
{
error_setg(errp, "hv-balloon device not enabled in this build");
return NULL;
}

30
hw/hyperv/hv-balloon.c
View file

@ -1102,7 +1102,35 @@ static void hv_balloon_handle_status_report(HvBalloon *balloon,
balloon->status_report.available *= HV_BALLOON_PAGE_SIZE;
balloon->status_report.received = true;
/* report event */
qapi_event_send_hv_balloon_status_report(balloon->status_report.committed,
balloon->status_report.available);
}
HvBalloonInfo *qmp_query_hv_balloon_status_report(Error **errp)
{
HvBalloon *balloon;
HvBalloonInfo *info;
balloon = HV_BALLOON(object_resolve_path_type("", TYPE_HV_BALLOON, NULL));
if (!balloon) {
error_setg(errp, "no %s device present", TYPE_HV_BALLOON);
return NULL;
}
if (!balloon->status_report.enabled) {
error_setg(errp, "guest memory status reporting not enabled");
return NULL;
}
if (!balloon->status_report.received) {
error_setg(errp, "no guest memory status report received yet");
return NULL;
}
info = g_malloc0(sizeof(*info));
info->committed = balloon->status_report.committed;
info->available = balloon->status_report.available;
return info;
}
static void hv_balloon_handle_unballoon_response(HvBalloon *balloon,

2
hw/hyperv/meson.build
View file

@ -2,4 +2,4 @@ specific_ss.add(when: 'CONFIG_HYPERV', if_true: files('hyperv.c'))
specific_ss.add(when: 'CONFIG_HYPERV_TESTDEV', if_true: files('hyperv_testdev.c'))
specific_ss.add(when: 'CONFIG_VMBUS', if_true: files('vmbus.c'))
specific_ss.add(when: 'CONFIG_SYNDBG', if_true: files('syndbg.c'))
specific_ss.add(when: 'CONFIG_HV_BALLOON', if_true: files('hv-balloon.c', 'hv-balloon-page_range_tree.c', 'hv-balloon-our_range_memslots.c'))
specific_ss.add(when: 'CONFIG_HV_BALLOON', if_true: files('hv-balloon.c', 'hv-balloon-page_range_tree.c', 'hv-balloon-our_range_memslots.c'), if_false: files('hv-balloon-stub.c'))