[Bug 869590] Re: KVM migration fails when tunnelled due to parsing error in qemu monitor

[Serge Hallyn]

** Description changed:

  While attempting a live migration tunnelled like this :
  
  virsh migrate --live --tunnelled --p2p guest1
  qemu+ssh://192.168.99.3/system
  
  the source host (node1) logs this error :
  
  Oct  6 17:44:06 node2 libvirtd: 17:44:06.513: error :
  qemuMonitorTextGetMigrationStatus:982 : internal error cannot parse
  migration data transferred statistic 1052 kbytes#015#012remaining ram:
  539972 kbytes#015#012total ram: 541024 kbytes#015#012
  
  And the guest VM freezes and start consuming 100% CPU infinitely.
+ 
+ =========================================================
+ SRU Justification:
+ 1. Impact: tunnelled migration fails
+ 2. Development fix: consists of a patch which fixes the parsing of the 'info migration' reply.
+ 3. Stable Fix: a simple cherrypick of the development fix
+ 4. Test case:
+ 	1. Set up two hosts with libvirt-bin.
+ 	2. Work around bug 869553.  You can do this by simply turning off apparmor on both.
+ 	3. Have them share storage (I install nfs-kernel-server on one, nfs-client on the other, place /mnt on the server's /etc/exports, and mount it on the client)
+ 	4. Create a VM with disks on the shared storage.  I basically follow https://wiki.ubuntu.com/SergeHallyn_libvirtnest but replace the disk and cdrom images under /mnt.
+ 	5. Create a ssh key for root on the client;  place it in root's .ssh/authorized_keys on the server.  Test that root on the client can ssh to the server.  Restart libvirt-bin
+ 	6. start the VM on the client
+ 	7. Migrate using:
+ virsh migrate --live --tunnelled --p2p cdboot qemu+ssh://server/system
+ 	8. With the patch, the vm should now be running on the server and not the client.
+ 5. Regression potential: this patch only affects the migration code, so if there is a regression it should only affect users of (non-tunnelled, as tunnelled is broken anyway) migration.
+ 		
+ =========================================================

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https://bugs.launchpad.net/bugs/869590

Title:
  KVM migration fails when tunnelled due to parsing error in qemu
  monitor

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