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[PULL 14/27] migration: Display the migration blockers

From: Dr. David Alan Gilbert (git)
Subject: [PULL 14/27] migration: Display the migration blockers
Date: Mon, 8 Feb 2021 11:29:05 +0000

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Update 'info migrate' to display migration blocking information.
If the outbound migration is not blocked, there is no change, however
if it is blocked a message is displayed with a list of reasons why,

qemu-system-x86_64 -nographic  -smp 4 -m 4G -M pc,usb=on \
 -chardev null,id=n -device usb-serial,chardev=n \
 -virtfs local,path=/home,mount_tag=fs,security_model=none \
 -drive if=virtio,file=myimage.qcow2

(qemu) info migrate
store-global-state: on
only-migratable: off
send-configuration: on
send-section-footer: on
decompress-error-check: on
clear-bitmap-shift: 18
Outgoing migration blocked:
  Migration is disabled when VirtFS export path '/home' is mounted in the guest 
using mount_tag 'fs'
  non-migratable device: 0000:00:01.2/1/usb-serial

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20210202135522.127380-3-dgilbert@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
 monitor/hmp-cmds.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 509d6b01ee..992ecf6f04 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -224,6 +224,15 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
+    if (info->blocked) {
+        strList *reasons = info->blocked_reasons;
+        monitor_printf(mon, "Outgoing migration blocked:\n");
+        while (reasons) {
+            monitor_printf(mon, "  %s\n", reasons->value);
+            reasons = reasons->next;
+        }
+    }
     if (info->has_status) {
         monitor_printf(mon, "Migration status: %s",

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