Re: [libvirt] [PATCH v4 1/2] libxl: add p2p migration

Introduce support for VIR_MIGRATE_PEER2PEER in libvirt migration. Most of the changes occur at the source and no modifications at the receiver. In P2P mode there is only the Perform phase so we must handle the connection with the destination and actually perform the migration. libxlDomainPerformP2P implements the connection to the destination and libxlDoMigrateP2P implements the actual migration logic with virConnectPtr. In this function we take care of doing all phases of migration in the destination similar to virDomainMigrateVersion3Full. We appropriately save the last error reported in each of the phases to provide proper reporting. We don't yet support VIR_MIGRATE_TUNNELED and we always use V3 with extensible params, thus it also makes the implementation simpler. It is worth noting that the receiver didn't have any changes, and since it's still the v3 sequence thus it is possible to migrate from a P2P to non-P2P host. Signed-off-by: Joao Martins <joao.m.martins(a)oracle.com&gt; --- Note: v4 series requires the patch ("remote: set VIR_TYPED_PARAM_STRING_OKAY on migration") [0] to make migration work again, but it's not reviewed yet. [https://www.redhat.com/archives/libvir-list/2016-February/msg00317.html] Changes since v3: - Put keep alive support into a separate patch and do it with proper configuration. - Fixed spelling errors on commit message. Changes since v2: - Remove Connect Close callback Changes since v1: - Move Begin step to libxlDoMigrateP2P to have all 4 steps together. - Remove if before VIR_FREE(dom_xml) --- src/libxl/libxl_driver.c | 13 ++- src/libxl/libxl_migration.c | 197 ++++++++++++++++++++++++++++++++++++++++++++ src/libxl/libxl_migration.h | 11 +++ 3 files changed, 218 insertions(+), 3 deletions(-)