Re: [libvirt] [PATCH v3 0/7] qemu: Add support for -incoming defer

Traditionally, we pass incoming migration URI on QEMU command line, which has some drawbacks. Depending on the URI QEMU may initialize its migration state immediately without giving us a chance to set any additional migration parameters (this applies mainly for fd: URIs). For some URIs the monitor may be completely blocked from the beginning until migration is finished, which means we may be stuck in qmp_capabilities command without being able to send any QMP commands. QEMU solved this by introducing "defer" parameter for -incoming command line option. This will tell QEMU to prepare for an incoming migration while the actual incoming URI is sent using migrate-incoming QMP command. Before calling this command we can normally talk to the monitor and even set any migration parameters which will be honored by the incoming migration. Jiri Denemark (7): qemu: Introduce qemuProcessInit qemu: Introduce qemuProcessLaunch qemu: Introduce qemuProcessFinishStartup qemu: Separate incoming URI generation from qemuMigrationPrepareAny qemu: Kill QEMU process if Prepare phase fails qemu: Skip starting NBD servers for offline migration qemu: Use qemuProcessLaunch in migration Prepare phase src/qemu/qemu_migration.c | 247 +++++++++++++---------- src/qemu/qemu_process.c | 489 +++++++++++++++++++++++++++++----------------- src/qemu/qemu_process.h | 20 ++ 3 files changed, 466 insertions(+), 290 deletions(-)