[Qemu-devel] [PATCH v2 00/38] Delay destruction of memory regions to instance_finalize

[Paolo Bonzini <pbonzini@redhat.com>]

QOM splits the destruction of a device in two phases:

- unrealize, also known as "exit" from qdev times, should isolate
  the device from the guest.  After unrealize returns, the guest
  should not be able to issue new requests.

- instance_finalize will reclaim the memory.  This is only called
  after all requests terminate and drop the references on the
  device.

Though overlooked, this is important even now: QEMU's little secret is
that devices already do access memory out of the iothread mutex (with
address_space_map/unmap and AIO), and this can be MMIO memory too
through a bounce buffer.  This series prepares things so that, once
we'll put the memory_region_ref/unref infrastructure to complete use,
things will just work.

Of course this split will be particularly important for devices that
will be able to do unlocked MMIO.

This series changes all PCI devices (the sole to support hotplug _and_
use MemoryRegions) to do memory_region_del_subregion at unrealize time,
and memory_region_destroy at instance_finalize time.  As it is mostly
a PCI patch, it should go through mst's tree.

Paolo

Paolo Bonzini (38):
  qdev: document assumption that unrealize is followed by finalize
  pci: split exit and finalize
  ac97: use instance_finalize instead of exit
  es1370: use instance_finalize instead of exit
  hda: reclaim memory in instance_finalize instead of exit
  serial: reclaim memory in instance_finalize instead of exit
  tpci200: use instance_finalize instead of exit
  pci-assign: reclaim memory in instance_finalize instead of exit
  ahci: reclaim memory in instance_finalize instead of exit
  msix: split msix_free from msix_uninit
  cmd646: use instance_finalize instead of exit
  ide/piix: use instance_finalize instead of exit
  ide/via: use instance_finalize instead of exit
  ivshmem: reclaim memory in instance_finalize instead of exit
  pci-testdev: use instance_finalize instead of exit
  vfio: reclaim memory in instance_finalize instead of exit
  e1000: use instance_finalize instead of exit
  eepro100: use instance_finalize instead of exit
  ne2000: use instance_finalize instead of exit
  pcnet: use instance_finalize instead of exit
  rtl8139: use instance_finalize instead of exit
  vmxnet3: reclaim memory in instance_finalize instead of exit
  shpc: split shpc_free from shpc_cleanup
  pci_bridge: split pci_bridge_free from pci_bridge_exitfn
  pcie_aer: pcie_aer_exit really frees stuff
  pci_bridge: reclaim memory in instance_finalize instead of exit
  ioh4320: reclaim memory in instance_finalize instead of exit
  xio3130-downstream: reclaim memory in instance_finalize instead of
    exit
  xio3130-upstream: reclaim memory in instance_finalize instead of exit
  pcie: do not recreate mmcfg I/O region, use an alias instead
  esp: use instance_finalize instead of exit
  lsi: use instance_finalize instead of exit
  pvscsi: reclaim memory in instance_finalize instead of exit
  usb-uhci: use instance_finalize instead of exit
  virtio-pci: reclaim memory in instance_finalize instead of exit
  wdt_i6300esb: use instance_finalize instead of exit
  xen_pt: reclaim memory in instance_finalize instead of exit
  tpm: move add/del_subregion to realize/unrealize

 hw/audio/ac97.c                    |  5 ++--
 hw/audio/es1370.c                  |  5 ++--
 hw/audio/intel-hda.c               |  8 ++++++
 hw/char/serial-pci.c               | 24 ++++++++++++++++++
 hw/char/tpci200.c                  |  5 ++--
 hw/i386/kvm/pci-assign.c           |  8 ++++++
 hw/ide/ahci.c                      |  2 +-
 hw/ide/ahci.h                      |  2 +-
 hw/ide/cmd646.c                    |  6 ++---
 hw/ide/ich.c                       | 12 ++++++---
 hw/ide/piix.c                      |  9 ++++---
 hw/ide/via.c                       |  6 ++---
 hw/misc/ivshmem.c                  | 13 +++++++---
 hw/misc/pci-testdev.c              |  6 ++---
 hw/misc/vfio.c                     | 52 +++++++++++++++++++++++++++++++++++---
 hw/net/e1000.c                     |  6 ++---
 hw/net/eepro100.c                  |  5 ++--
 hw/net/ne2000.c                    |  5 ++--
 hw/net/pcnet-pci.c                 |  6 ++---
 hw/net/rtl8139.c                   |  6 ++---
 hw/net/vmxnet3.c                   | 14 ++++++++--
 hw/pci-bridge/i82801b11.c          |  1 +
 hw/pci-bridge/ioh3420.c            | 11 +++++++-
 hw/pci-bridge/pci_bridge_dev.c     | 13 +++++++++-
 hw/pci-bridge/xio3130_downstream.c | 11 +++++++-
 hw/pci-bridge/xio3130_upstream.c   | 11 +++++++-
 hw/pci/msix.c                      | 22 +++++++++++-----
 hw/pci/pci.c                       | 15 ++++++++---
 hw/pci/pci_bridge.c                |  5 ++++
 hw/pci/pcie_aer.c                  |  3 ++-
 hw/pci/pcie_host.c                 | 23 ++++++++++++-----
 hw/pci/shpc.c                      |  8 +++++-
 hw/scsi/esp-pci.c                  |  6 ++---
 hw/scsi/lsi53c895a.c               |  6 ++---
 hw/scsi/vmw_pvscsi.c               | 12 ++++++++-
 hw/tpm/tpm_tis.c                   | 17 +++++++++----
 hw/usb/hcd-uhci.c                  |  5 ++--
 hw/virtio/virtio-pci.c             | 10 +++++++-
 hw/watchdog/wdt_i6300esb.c         |  5 ++--
 hw/xen/xen_pt.c                    | 10 ++++++++
 hw/xen/xen_pt_config_init.c        |  3 ---
 hw/xen/xen_pt_msi.c                |  8 +++++-
 include/hw/pci/msix.h              |  1 +
 include/hw/pci/pci_bridge.h        |  1 +
 include/hw/pci/pcie_aer.h          |  2 +-
 include/hw/pci/pcie_host.h         |  1 +
 include/hw/pci/shpc.h              |  1 +
 include/hw/qdev-core.h             |  4 +++
 48 files changed, 329 insertions(+), 91 deletions(-)

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1.8.3.1