Libvirt supports FD-based live migrations in the form of tunnelled
migrations. However, this isn't as performant as of now, since it
involves extra copies. 

This patchset proposes adding support for externally provided file
descriptors for live migration. By allowing the client to supply the
migration FD directly, the extra copy can be avoided, improving overall
migration performance.

The intent is to gather early feedback on the approach and its
feasibility. Comments, concerns, and suggestions are very welcome :)


regards,
Tejus

Tejus GK (4):
  qemu: fd: introduce qemuFDTuple for FD storage
  lib: introduce virDomainFDStore API
  qemu: support incoming "fd" uri
  qemu: add support for fd based live migrations

 include/libvirt/libvirt-domain.h    |   9 +++
 src/driver-hypervisor.h             |   7 ++
 src/libvirt-domain.c                |  62 +++++++++++++++
 src/libvirt_public.syms             |   5 ++
 src/qemu/qemu_conf.h                |   4 +
 src/qemu/qemu_driver.c              |  41 ++++++++++
 src/qemu/qemu_fd.c                  |  23 ++++++
 src/qemu/qemu_fd.h                  |  14 ++++
 src/qemu/qemu_migration.c           | 117 +++++++++++++++++++++++++++-
 src/remote/remote_daemon_dispatch.c |  36 +++++++++
 src/remote/remote_driver.c          |  22 ++++++
 src/remote/remote_protocol.x        |  12 ++-
 12 files changed, 348 insertions(+), 4 deletions(-)

-- 
2.43.7