Re: [Qemu-devel] [PATCH V8 00/17] hw/pc: implement multiple primary busses for pc machines

[Laszlo Ersek <lersek@redhat.com>]

On 06/02/15 13:22, Marcel Apfelbaum wrote:
> The series is fully functional.
>  - Limitations:
>    - Pxb's bus does not support hotplug. It will be addressed on top of this series
>      because is already getting to big.
>    - Pxb devices work only for i440fx and can be attached only to bus 0.
>  - You are more than welcome to try using:
>        -device pxb,id=pxb,bus_nr=4,numa_node=1 -device e1000,bus=pxb,addr=0x1
> 
> v7->v8:
>  - rebased on latest pci branch
>  - aml patches already taken
>  - added a fix for one of the aml patches
> 
> v6->v7:
>  - This version includes some refactoring requested by Michael S. Tsirking,
>    but no new functionality:
>    - Removed TYPE_PCI_MAIN_HOST_BRIDGE interface and scan only pc/q35 host-bridges when
>      needed, see patch 11/24.
>    - Removed TYPE_PCI_HOST_BRIDGE_SNOOPED interface and added PXB buses as child buses
>      of i440fx. The pci configuration is changed to support PXBs, see patch 12/24.
>    - Removed patch "hw/pci: move pci bus related code to separate files" and refactor
>      all patches that touched the new file.
>  - Addressed Paolo's review:
>    - Changed documentation to always use numa policy "bind".
> 
> v5->v6:
>  - This version includes a lot of refactoring requested by Michael S. Tsirking,
>    but no new/different functionality:
>    - Removed the HOST_BRIDGE_FOR_EACH loop because it too generic
>    - Reduced the generic "extra pci roots" aproach to a more "non-generic"
>      root bus having snooping buses listening to its configuration space.
>      Instead of going over all host bridges, we go only over the snooping
>      host bridges associated with the main host bridge.
>    - The current implementation made i440fx the only a "snooped" host bridge
>  - Addressed Michael S. Tsirkin's review:
>    - Replaced qmp queries with native pci ones.
>    - Squashed later patches into their places
>    - Tweaked a few comments
>  - Addressed Shannon Zhao's review:
>    - Used build_append_byte instead of build_append_int
>  - Addressed Gerd's review:
>    - Reduced the "Line over 80" warnings.
>  - Rebased on pci branch, tree: git://git.kernel.org/pub/scm/virt/kvm/mst/qemu.git
>    - a few days before, I hope is enough
>  - Changed some patches order
> 
> v4->v5:
>  - Rebased on pci branch, tree: git://git.kernel.org/pub/scm/virt/kvm/mst/qemu.git
>  - Added PXB documentation (patch 28/28)
>  - Addressed Gerd Hoffmann's review:
>    - fix PXB behaviour if used with unsupported BIOS (patch 27/28)
>  - Addressed Michael S. Tsirkin's review:
>    - Removed assert in aml_index (patch 5/28)
>    - Renamed pci_ functions to crs_ (patch 12/28)
>    - used uint64_t variables instead of signed ones (patch 12/28)
>    - Emit MEM/IO AML only for PXBs and i440fx (patch 26/28)
>  - Addressed Shannon Zhao's review:
>    - Changed build_append_int to  build_append_byte in aml_or (patch 2/25)
>  - Thanks to Igor and Kevin for reviews
> 
> v3->v4:
>  - Addressed Michael S. Tsirkin's review:
>    - refactored build_prt method (patch 11/25) 
>      hw/apci: add _PRT method for extra PCI root busses
>  - Addressed Igor Mammedov's reiew
>    - add assert to aml_index (patch 5/25)
>  - Fixed aml_equal implementation (patch 1/25)
> 
> v2->v3:
>  - Rebased on Michael S. Tsirkin's pci branch (that includes now all the dependencies)
>  - Refactored acpi terms patch into multiple patches to match Igor's design.
> 
> v1->v2:
>  - Add support for multiple pxb devices.
>  - Attach pxb's bus to specific NUMA node.
>  - Got rid of the hacks from prev version.
>  - Tested also for Win7 and Fedora 20, and for virtio blk devices.
>  - Several bug-fixes resulting in a stable version ready for submission.
> 
> Reasoning:
> We need multiple primary busess for a few reasons, the most important one
> is to be able to associate a pass-trough device with a guest NUMA node.
> The OS-es are able to associate a NUMA node only to a primary bus, not to
> a specific PCI device or a pci-2-pci bridge.
> PC machines support multiple NUMA nodes for CPUs and memory, however the IO
> was not yet supported.
> 
> 
> Marcel Apfelbaum (17):
>   acpi: add implementation of aml_while() term
>   hw/pci: made pci_bus_is_root a PCIBusClass method
>   hw/pci: made pci_bus_num a PCIBusClass method
>   hw/i386: query only for q35/pc when looking for pci host bridge
>   hw/pci: extend PCI config access to support devices behind PXB
>   hw/acpi: add support for i440fx 'snooping' root busses
>   hw/apci: add _PRT method for extra PCI root busses
>   hw/acpi: add _CRS method for extra root busses
>   hw/acpi: remove from root bus 0 the crs resources used by other buses.
>   hw/pci: removed 'rootbus nr is 0' assumption from qmp_pci_query
>   hw/pci: introduce PCI Expander Bridge (PXB)
>   hw/pci: inform bios if the system has extra pci root buses
>   hw/pxb: add map_irq func
>   hw/pci: add support for NUMA nodes
>   hw/pxb: add numa_node parameter
>   apci: fix PXB behaviour if used with unsupported BIOS
>   docs: Add PXB documentation
> 
>  docs/pci_expander_bridge.txt        |  58 ++++++
>  hw/acpi/aml-build.c                 |   8 +
>  hw/i386/acpi-build.c                | 396 ++++++++++++++++++++++++++++++++++--
>  hw/i386/pc.c                        |  20 ++
>  hw/pci-bridge/Makefile.objs         |   1 +
>  hw/pci-bridge/pci_expander_bridge.c | 231 +++++++++++++++++++++
>  hw/pci/pci.c                        |  78 +++++--
>  include/hw/pci/pci.h                |   4 +
>  include/hw/pci/pci_bus.h            |  10 +
>  include/sysemu/sysemu.h             |   1 +
>  10 files changed, 776 insertions(+), 31 deletions(-)
>  create mode 100644 docs/pci_expander_bridge.txt
>  create mode 100644 hw/pci-bridge/pci_expander_bridge.c
> 

series
Acked-by: Laszlo Ersek <lersek@redhat.com>