[Qemu-devel] [PATCH v3 0/2] VT-d migration support

[Peter Xu <peterx@redhat.com>]

This series enables VT-d IOMMU migration.

v3:
- save/load for csr [Jason]

v2:
- remove SaveStateEntry.priority, let priority store only in one
  place, which is VMStateDescription. Meanwhile, provide another
  helper to fetch the priority.
- add enum MigrationPriority to unify the ordering, rather than use
  magic numbers like 100 everywhere [Dave]
- fix commit log where proper

First patch is an enhancement to current migration framework to allow
prioritized save state entry. This is required to let VT-d migrate
properly.

The second patch enables the migration for the vIOMMU.

Please check commit message for more information.

Test done:

Smoke test is done with parameter:

  $qemu -M q35,kernel-irqchip=off -enable-kvm \
        -device intel-iommu,intremap=on \
        -netdev user,id=net0 \
        -device e1000,netdev=net0 \
        -m 512M -monitor stdio \
        $param /var/lib/libvirt/images/vm1.qcow2

Please review, thanks.

(P.S. I found that split irqchip cannot work well with migration. Is
 this an known issue?)

Peter Xu (2):
  migration: allow to prioritize save state entries
  intel_iommu: allow migration

 hw/i386/intel_iommu.c       | 22 +++++++++++++++++++++-
 include/migration/vmstate.h |  7 +++++++
 migration/savevm.c          | 34 ++++++++++++++++++++++++++++++----
 3 files changed, 58 insertions(+), 5 deletions(-)

-- 
2.7.4