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

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Oct 07, 2013 at 12:21:26PM +0300, Michael S. Tsirkin wrote:
> This is on top of patchset generating ACPI tables in qemu.
> Please review and consider for 1.7.

No comments, I assume it's ok to merge this.

> 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
>