[libvirt] [PATCH v4 0/6] vz: add migration support

NOTE that minimal command to migrate vz domain is like next: virsh -c vz:///system migrate 200 vz+ssh://shiny0/system --p2p --live --compressed --persistent --undefinesource ==Difference from v1: 1. Patch is quite different. First patchset implements migration thru managed migration scheme. This one goes thru p2p scheme. I belive this is a better approach. Vz migration is done via vz sdk and first patchset uses 5 phased migration only to get a token from destination on prepare phase which is kind a misuse. This patch just adds vz specific function to driver interface to archive the same goal. 2. Offline migration is supported as there is no more dependency on current flow of managed migration scheme. ==Difference from v2: 1. Implement thru direct migration instead of p2p. p2p is just managed 5-staged migration when managing is done on daemon side. Vz migration stages are all hidden in vz sdk and thus it would be more consistent to use direct scheme. 2. Use existing driver function for prepare migration phase to pass session uuid from destination to source instead of new one. As vz migration is direct one we will not use prepare phase function in a straight forward manner anyway. ==Difference from v3: Return back to p2p implementation. Difference from p2p implementation in v2 is that prepare phase driver function is used to pass session_uuid from destination to source instead of new ad-hoc driver function. src/vz/vz_driver.c | 342 ++++++++++++++++++++++++++++++++++++++++++++++++++++ src/vz/vz_sdk.c | 86 +++++++++++-- src/vz/vz_sdk.h | 6 + src/vz/vz_utils.h | 4 +- 4 files changed, 423 insertions(+), 15 deletions(-)