[Qemu-devel] [PATCH v4 0/4] Introduce a new --only-migratable option

[Ashijeet Acharya <ashijeetacharya@gmail.com>]

Previously posted series patches:
http://lists.nongnu.org/archive/html/qemu-devel/2017-01/msg00320.html
http://lists.nongnu.org/archive/html/qemu-devel/2016-12/msg02391.html
http://lists.nongnu.org/archive/html/qemu-devel/2016-12/msg02062.html

This series adds a new command line option "--only-migratable" which will only
allow addition of those devices to a QEMU instance which are migratable and do
not abruptly fail QEMU after migration.

Patch 1 adds the new option "-only-migratable".

Patch 2 adds compatibility for various "device adding" options for both via
command line and hotplug methods.

Patch 3 helps to fail the migration blocker if the migration is already in
progress and thus cannot be blocked.
Note: This patch was originally written by John Snow and I have only made few
changes.

Patch 4 handles the special case of devices which become unmigratable
dynamically
by making call to "migrate_add_blocker". Here we fail the particular action of
the
device which results in an unmigratable VM.
Eg: 9pfs fails to mount the filesystem.

Note: I have not been able to test and compile the ARM drivers for KVM. They
are:
hw/intc/arm_gic_kvm.c
hw/intc/arm_gicv3_its_kvm.c
hw/intc/arm_gicv3_kvm.c

Changes in v4:
- drop diff in 9pfs for patch 4/4
- call clunk_fid() after freeing migration_blocker
- drop ret and use err directly

Changes in v3:
- set s->root_fid after migrate_add_blocker
- free migration_blocker inside v9fs_attach()
- change back ret<0 to just ret
- free local_err

Changes in v2:
- change the documentation for the new option
- add a NULL check for ObjectClass
- break patch 3 into patch 3 and 4
- use error_append_hint
- return -EACCES for only-migratable
- fix the error messages

Ashijeet Acharya (4):
  migration: Add a new option to enable only-migratable
  migration: Allow "device add" options to only add migratable devices
  migration: disallow migrate_add_blocker during migration
  migration: Fail migration blocker for --only-migratble

 block/qcow.c                  |  9 ++++++++-
 block/vdi.c                   |  9 ++++++++-
 block/vhdx.c                  | 18 ++++++++++++------
 block/vmdk.c                  | 10 +++++++++-
 block/vpc.c                   | 13 ++++++++++---
 block/vvfat.c                 | 22 ++++++++++++++--------
 hw/9pfs/9p.c                  | 18 +++++++++++++-----
 hw/display/virtio-gpu.c       | 34 +++++++++++++++++++++-------------
 hw/intc/arm_gic_kvm.c         | 19 +++++++++++++------
 hw/intc/arm_gicv3_its_kvm.c   | 21 ++++++++++++++-------
 hw/intc/arm_gicv3_kvm.c       | 22 +++++++++++++++-------
 hw/misc/ivshmem.c             | 17 +++++++++++++----
 hw/scsi/vhost-scsi.c          | 27 +++++++++++++++++++++------
 hw/usb/bus.c                  | 18 ++++++++++++++++++
 hw/virtio/vhost.c             | 10 +++++++++-
 include/migration/migration.h |  9 ++++++++-
 migration/migration.c         | 42 ++++++++++++++++++++++++++++++++++++++++--
 qdev-monitor.c                |  9 +++++++++
 qemu-options.hx               |  9 +++++++++
 stubs/migr-blocker.c          |  3 ++-
 target-i386/kvm.c             | 19 ++++++++++++++++---
 vl.c                          |  4 ++++
 22 files changed, 286 insertions(+), 76 deletions(-)

-- 
2.6.2