[PATCH QEMU HCI-8.1 v5 00/36] vfio: support qemu-update with passed through GPU's and vGPU's #VSTOR-103860

[Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>]

v4 -> v5:

Live migration of a vGPU VM with the default downtime limit (#VSTOR-150595).

- Patch 35 (NEW) ("VZ: migration: keep the estimate and wait over starved
  windows"): the bandwidth, and so the pending size allowed for the
  switchover, was measured over the windows the sender had run out of
  dirty pages in, collapsing to a fraction of the link rate; meanwhile
  the migration thread spun re-syncing the dirty logs

- Patch 36 (NEW) ("VZ: migration: don't wait for stop-copy-only device
  state"): the vGPU's stop-copy state (2 GB for NVIDIA) never fits the
  limit, so the migration never switched over; switch over once the rest
  is within the limit plus as much again, as waiting can't help

Fixes of the issues found by Sashiko AI review.

- Patch 4 ("migration/cpr-exec: require a file or exec migration URI"):
  CPR.rst says the URI must be a file or exec one

- Patch 5 ("migration: close the CPR state if the outgoing channel fails
  to open"): the message no longer claims the cpr-exec memfd is closed,
  see patch 6

- Patch 6 (NEW) ("migration/cpr-exec: close the persisted state if the
  channel fails to open"): the memfd dup'd for the exec and the
  environment variable pointing at it were leaked when the file or exec
  URI couldn't be opened

- Patch 7 (NEW) ("migration: don't refuse a blocker over a migration of
  another mode"): a blocker for cpr-transfer only was refused while a
  normal migration runs, failing the operation adding it

- Patch 26 (NEW) ("vfio/migration: don't assume the device is running on
  CPR incoming"): after CPR of a paused VM, 'cont' found the cached
  device state already RUNNING and skipped the transition, leaving the
  device stopped

- Patch 29 -> 32 ("VZ: vfio/region: preserve BAR mappings across
  cpr-exec"): a preserved mapping of a different size is reported and
  exits, instead of asserting

v4: http://lore.virtuozzo.com/20261020-vfio_v1-v4-0-83a5668230e5@virtuozzo.com
---
Akihiko Odaki (1):
      vfio/pci: Grow buffer in vfio_pci_host_match()

Andrey Drobyshev (22):
      VZ: migration/cpr-exec: fix Error leak in preserve_ram()
      migration/cpr-exec: restore RAM write access if exec fails
      vfio/region: create BAR dma-bufs with O_CLOEXEC
      migration/cpr-exec: require a file or exec migration URI
      migration: close the CPR state if the outgoing channel fails to open
      migration/cpr-exec: close the persisted state if the channel fails to open
      migration: don't refuse a blocker over a migration of another mode
      kvm: tolerate ioctls after kvm_close()
      kvm: fix coalesced MMIO flush racing with kvm_close()
      migration/cpr: add cpr_is_in_progress()
      vfio/migration: don't migrate device state during CPR
      vfio/migration: don't assume the device is running on CPR incoming
      vfio/listener: skip dirty page tracking during CPR
      VZ: vfio/cpr: don't close KVM on cpr-exec
      VZ: migration/cpr-exec: abort cpr-exec if memory can't be preserved
      VZ: migration/cpr-exec: take the vhost-net devices back if exec fails
      VZ: migration/cpr-exec: don't exec if a vhost-net device can't be released
      VZ: vfio/region: preserve BAR mappings across cpr-exec #VSTOR-103860
      VZ: migration/cpr-exec: allow cpr-exec with VFIO devices #VSTOR-103860
      VZ: vfio/container: lift the CPR blocker for mdev devices #VSTOR-103860
      VZ: migration: keep the estimate and wait over starved windows #VSTOR-150595
      VZ: migration: don't wait for stop-copy-only device state #VSTOR-150595

Arun Menon (1):
      migration: Fix regression of passing error_fatal into vmstate_load_state()

Cédric Le Goater (2):
      vfio/pci: Reject invalid MSI-X Table and PBA BIR values
      vfio/pci: Fix information leak in vfio_rom_read()

Fabiano Rosas (3):
      migration: yank: Move register instance earlier
      migration: Free cpr-transfer MigrationAddress along with gsource
      migration: Move CPR HUP watch to cpr-transfer.c

Igor Mammedov (1):
      q35: Fix migration of SMRAM state

Mario Casquero (1):
      vfio/pci: Initialize rom_read_failed in vfio_pci_load_rom()

Markus Armbruster (1):
      migration: Plug memory leaks after migrate_set_error()

Peter Xu (1):
      migration: Fix crash on second migration when cancel early

Tycho Andersen (AMD) (1):
      hw/vfio: Fix liveness check in vfio_connect_kvm_msi_virq()

Vladimir Sementsov-Ogievskiy (1):
      migration: vmstate_save_state_v: fix double error_setg

Yanfei Xu (1):
      migration: ensure APIC is loaded prior to VFIO PCI devices

 accel/kvm/kvm-all.c           |  24 ++++++-
 docs/devel/migration/CPR.rst  |   8 +--
 hw/display/virtio-gpu.c       |  22 ++++--
 hw/intc/apic_common.c         |   1 +
 hw/net/vhost_net.c            |  62 +++++++++++++++-
 hw/pci-host/q35.c             |  25 +++----
 hw/pci/pci.c                  |  15 +++-
 hw/s390x/virtio-ccw.c         |  17 ++++-
 hw/scsi/spapr_vscsi.c         |  10 ++-
 hw/vfio/container-legacy.c    |  13 ----
 hw/vfio/cpr.c                 |  11 +--
 hw/vfio/device.c              |  29 ++++++--
 hw/vfio/listener.c            |   6 ++
 hw/vfio/migration-multifd.c   |   2 +
 hw/vfio/migration.c           |  59 ++++++++++++++-
 hw/vfio/pci.c                 |  25 ++++---
 hw/vfio/region.c              |  51 ++++++++++++-
 hw/virtio/virtio-mmio.c       |  15 +++-
 hw/virtio/virtio-pci.c        |  15 +++-
 hw/virtio/virtio.c            |  10 ++-
 include/hw/vfio/vfio-cpr.h    |   2 +-
 include/hw/vfio/vfio-device.h |   2 -
 include/hw/virtio/vhost.h     |   2 +
 include/migration/cpr.h       |   7 ++
 include/migration/vmstate.h   |   1 +
 include/net/vhost_net.h       |   3 +-
 migration/cpr-exec.c          |  44 ++++++++++--
 migration/cpr-transfer.c      |  33 +++++++++
 migration/cpr.c               |  22 ++++++
 migration/migration.c         | 164 ++++++++++++++++++++++++++----------------
 migration/migration.h         |  11 +++
 migration/multifd.c           |   2 +
 migration/savevm.c            |  15 +++-
 migration/savevm.h            |   5 +-
 migration/vmstate.c           |   7 +-
 tests/qtest/q35-test.c        |   6 --
 36 files changed, 586 insertions(+), 160 deletions(-)
---
base-commit: f3c1d9ef263edfab8d2a273078493bb766dcf8f8
change-id: 20261009-vfio_v1-a176cddd6b64

Best regards,
--  
Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>