[Qemu-devel] [PATCH v3 0/4] acpi hotplug of devices behind a pci bridge

[Michael S. Tsirkin]

This is on top of patchset generating ACPI tables in qemu.
Please review and consider for 1.7.

Changes from v2:
    - split new code out to a separate file: acpi/pcihp.c
      this way we can reuse it for q35 later
    - rebased on top of the latest acpi-build patchset

Changes from v1:
    - fixed some bugs
    - fixed migration and cross version compatibility
    - rebased to latest bits

This adds support for device hotplug behind pci bridges, by generating ACPI
tables describing the current hierarchy.
Bridge devices themselves need to be pre-configured on qemu command line.

How to use:
Describe buses on command line. E.g.:
    -device pci-bridge,id=bar,chassis_nr=1 -device
    virtio-net,netdev=bur,addr=0x1,id=far,bus=bar
use monitor command for hotplug:
    device_del far

We don't currently use QOM properties to generate this info since:
    - info about hotpluggability of devices is lacking
    - we need to list all devices and buses in a predictable order
        For now, add a pci core function to do the above predictable order
        walk.

This is on top of acpi patchset posted previously.
with a small patch adding a core function to walk all
pci buses, on top.
Can also be found in my git tree
    git://git.kernel.org/pub/scm/virt/kvm/mst/qemu.git acpi-bridges

Portability:
    - Non x86 (or any Linux) platforms don't need any of this code.
      They can keep happily using SHPC the way
      they always did.

Things to note:

    - Extensive use of glib completely removes
      pointer math: we use
      g_array_append_vals exclusively.

    - As was the case previously,
      systems that lack working iasl are detected at configure time,
      pre-generated hex files in source tree are used in this case.
      This addresses the concern with iasl/big-endian
      systems.

    - Cross version migration: when running with -M 1.6
      and older, new hotplug functionality is unavailable.
      All ACPI table generation is disabled.
      We present FW_CFG interface compatible with 1.6.

Michael S. Tsirkin (4):
  pci: add pci_for_each_bus_depth_first
  pcihp: generalization of piix4 acpi
  piix4: add acpi pci hotplug support
  acpi-build: enable hotplug for PCI bridges

 include/hw/acpi/pcihp.h |  72 ++++++++++
 include/hw/i386/pc.h    |   5 +
 include/hw/pci/pci.h    |  14 ++
 hw/acpi/pcihp.c         | 312 +++++++++++++++++++++++++++++++++++++++++++
 hw/acpi/piix4.c         |  75 +++++++++--
 hw/i386/acpi-build.c    | 346 ++++++++++++++++++++++++++++++++++++++----------
 hw/pci/pci.c            |  28 ++++
 hw/acpi/Makefile.objs   |   2 +-
 hw/i386/acpi-dsdt.dsl   |  34 +++--
 hw/i386/ssdt-pcihp.dsl  |  11 +-
 10 files changed, 794 insertions(+), 105 deletions(-)
 create mode 100644 include/hw/acpi/pcihp.h
 create mode 100644 hw/acpi/pcihp.c

-- 
MST