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Re: [Qemu-devel] [PATCH v15 00/10] KVM platform device passthrough

From: Eric Auger
Subject: Re: [Qemu-devel] [PATCH v15 00/10] KVM platform device passthrough
Date: Wed, 06 May 2015 08:37:15 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0

Dear All,

Please ignore the previous void message. For unknown reason the reply
systematically ignores the content of the message? Retrying breaking the
history... Content was:

I am looking for "Tested-by" for this series and related Machvirt
dynamic sysbus device instantiation. Did anyone try the last versions?

I know those series are not plug & play since additions are needed for
your device:
- device tree node addition in sysbus device
- creation of a specialized QEMU VFIO platform device since base class
is abstract

For those willing to try and assess that code, please do not hesitate to
contact me. I can and I am willing to help. If you already did, with
success or facing issues, please send your Tested-by or report any issue
for quick fix. This will definitively help in the upstream of this code.


Best Regards


This series aims at enabling KVM platform device passthrough.

On kernel side, the vfio platform driver is needed, available from
4.1-rc1 onwards.

This series now only relies on the following QEMU series, for
dynamic instantiation of the VFIO platform device from qemu command

[1] [PATCH v12 0/4] machvirt dynamic sysbus device instantiation

Both series are candidate for QEMU 2.4 and available at

(branch vfio_integ_v15)

The series was tested on Calxeda Midway (ARMv7) where one xgmac
is assigned to KVM host while the second one is assigned to the guest.

Wiki for Calxeda Midway setup:


v14 -> v15:
- add Peter R-b on sysbus: add irq_routing_notifier
- correct g_malloc0_n usage in skeleton
- correct return values of reset related functions
- include Cornelia's patch for header update

v13 -> v14:
- remove v13 9, 10, 11 patch files and replace them by a single patch file
  "sysbus: add irq_routing_notifier".
- in skeleton, fix ENAMETOOLONG sign
- remove VFIOINTp virtualID in "add irq assignment" patch file
- removed trace_vfio_platform_start_eventfd

v12 -> v13:
- header update but same update was already sent by Cornelia
- Rework VFIO signaling & irqfd setup: restored 2-step setup featuring
  eventfd setup on realize and then irqfd setup on irq binding.
- irqfd setup now uses kvm_irqchip_add_irqfd_notifier and
  sysbus irq_set_hook override. This leads to the introduction of 6 patch
  files enabling those 2 features. Paolo advised to introduce
  kvm_irqchip_add_irqfd_notifier series in the VFIO one. I did the
  same for irq_set_hook series but if it is better I can submit it aside.
- above changes made possible to remove
  x hw/vfio/platform: add capability to start IRQ propagation"
  x hw/arm/virt: start VFIO IRQ propagation
- in sysbus-fdt.c, use platform_bus_get_mmio_addr instead of deprecated
  mmio[0] property. Thanks to Bharat who pointed this issue out. also
  cpu_to_be32 was used for size and base (Vikram input) .
- in skeleton misc corrections following Alex review.

- add x-mmap property definition, without which the default value of
  vbasedev.allow_mmap is false, hence preventing the reg space from
  being mmapped.

- rebase onto v2.3.0-rc0 (mainly related to PCIe support in virt)
- add dma-coherent property for calxeda midway (fix revealed by removal
  of kernel-side "vfio: type1: support for ARM SMMUS with VFIO_IOMMU_TYPE1")
- virt modifications to start VFIO IRQ forwarding are now in a separate
- rearrange linux header exports (those are still partial exports
  waiting for definitive 4.1-rc0)
- take into account Alex Bennée comments:
  - use g_malloc0_n instead of g_malloc0
  - use block declarations when possible
  - rework readlink returned value treatment
  - use g_strlcat in place strncat
  - re-arrange mutex locking for multiple IRQ support (user-side handled
- use g_snprintf instead of snprintf
- change the order of functions to avoid pre-declaration in platform.c
- add flags in VFIOINTp struct to detect whether the IRQ is automasked
- some comment rewriting

- rebase on "vfio: cleanup vfio_get_device error path, remove
  vfio_populate_device": vfio_populate_device no more called in
  vfio_get_device but in vfio_base_device_init
- update VFIO header according to vfio platform driver v13 (no AMBA)

- rebase on 2.2.0 and machvirt dynamic sysbus instantiation v10
- v8 1-11 were pulled
- patch files related to forwarding are moved in a seperate series since
  it depends on kernel series still in RFC.
- introduction of basic VFIO platform device split into 3 patch files to
  ease the review (hope it will help).
- add an author in platform.c
- add deallocation in vfio_populate_device error case
- add patch file doing the VFIO header sync
- use VFIO_DEVICE_FLAGS_PLATFORM in vfio_populate_device
- rename calxeda_xgmac.c into calxeda-xgmac.c
- sysbus-fdt: add_calxeda_midway_xgmac_fdt_node g_free in case of errors
- reword of linux-headers patch files

- rebase on v2.2.0-rc3 and integrate
  "Add skip_dump flag to ignore memory region during dump"
- KVM header evolution with subindex addition in kvm_arch_forwarded_irq
- split [PATCH v7 03/16] hw/vfio/pci: introduce VFIODevice into 4 patches
- vfio_compute_needs_reset does not return bool anymore
- add some comments about exposed MMIO region and IRQ in calxeda xgmac
- vfio_[un]mask_irqindex renamed into vfio_[un]mask_single_irqindex
- rework IRQ startup: former machine init done notifier is replaced by a
  reset notifier. machine file passes the interrupt controller
  DeviceState handle (not the platform bus first irq parameter).
- sysbus-fdt:
  - move the add_fdt_node_functions array declaration between the device
    specific code and the generic code to avoid forward declarations of
    decice specific functions
  - rename add_basic_vfio_fdt_node into add_calxeda_midway_xgmac_fdt_node
    emphasizing the fact it is xgmac specific

- fake injection test modality removed
- VFIO_DEVICE_TYPE_PLATFORM only introduced with VFIO platform
- new helper functions to start VFIO IRQ on machine init done notifier
  (introduced in hw/vfio/platform: add vfio-platform support and notifier
  registration invoked in hw/arm/virt: add support for VFIO devices).
  vfio_start_irq_injection is replaced by vfio_register_irq_starter.

- rebase on 2.1rc5 PCI code
- forwarded IRQ first integraton
- vfio_device property renamed into host property
- split IRQ setup in different functions that match the 3 supported
  injection techniques (user handled eventfd, irqfd, forwarded IRQ):
  removes dynamic switch between injection methods
- introduce fake interrupts as a test modality:
  x makes possible to test multiple IRQ user-side handling.
  x this is a test feature only: enable to trigger a fd as if the
    real physical IRQ hit. No virtual IRQ is injected into the guest
    but handling is simulated so that the state machine can be tested
- user handled eventfd:
  x add mutex to protect IRQ state & list manipulation,
  x correct misleading comment in vfio_intp_interrupt.
  x Fix bugs using fake interrupt modality
- irqfd no more advertised in this patchset (handled in [3])
- VFIOPlatformDeviceClass becomes abstract and Calxeda xgmac device
  and class is re-introduced (as per v4)
- all DPRINTF removed in platform and replaced by trace-points
- corrects compilation with configure --disable-kvm
- simplifies the split for vfio_get_device and introduce a unique
  specialized function named vfio_populate_device
- group_list renamed into vfio_group_list
- hw/arm/dyn_sysbus_devtree.c currently only support vfio-calxeda-xgmac
  instantiation. Needs to be specialized for other VFIO devices
- fix 2 bugs in dyn_sysbus_devtree(reg_attr index and compat)

- rebase on v2.1.0 PCI code
- take into account Alex Williamson comments on PCI code rework
  - trace updates in vfio_region_write/read
  - remove fd from VFIORegion
  - get/put ckeanup
- bug fix: bar region's vbasedev field duly initialization
- misc cleanups in platform device
- device tree node generation removed from device and handled in
- remove "hw/vfio: add an example calxeda_xgmac": with removal of
  device tree node generation we do not have so many things to
  implement in that derived device yet. May be re-introduced later
  on if needed typically for reset/migration.
- no GSI routing table anymore

v3->v4 changes (Eric Auger, Alvise Rigo)
- rebase on last VFIO PCI code (v2.1.0-rc0)
- full git history rework to ease PCI code change review
- mv include files in hw/vfio
- DPRINTF reformatting temporarily moved out
- support of VFIO virq (removal of resamplefd handler on user-side)
- integration with sysbus dynamic instantiation framwork
- removal of unrealize and cleanup routines until it is better
  understood what is really needed
- Support of VFIO for Amba devices should be handled in an inherited
  device to specialize the device tree generation (clock handle currently
  missing in framework however)
- "Always use eventfd as notifying mechanism" temporarily moved out
- static instantiation is not mainstream (although it remains possible)
  note if static instantiation is used, irqfd must be setup in machine file
  when virtual IRQ is known
- create the GSI routing table on qemu side

v2->v3 changes (Alvise Rigo, Eric Auger):
- Following Alex W recommandations, further efforts to factorize the
  code between PCI:introduction of VFIODevice and VFIORegion
  as base classes
- unique reset handler for platform and PCI
- cleanup following Kim's comments
- multiple IRQ support mechanics should be in place although not
- Better handling of MMIO multiple regions
- New features and fixes by Alvise (multiple compat string, exec
  flag, force eventfd usage, amba device tree support)
- irqfd support

v1->v2 changes (Kim Phillips, Eric Auger):
- IRQ initial support (legacy mode where eventfds are handled on
  user side)
- hacked dynamic instantiation

v1 (Kim Phillips):
- initial split between PCI and platform
- MMIO support only
- static instantiation

Best Regards


Cornelia Huck (1):
  linux-headers: update

Eric Auger (9):
  hw/vfio/platform: vfio-platform skeleton
  hw/vfio/platform: add irq assignment
  hw/vfio/platform: calxeda xgmac device
  hw/arm/sysbus-fdt: enable vfio-calxeda-xgmac dynamic instantiation
  kvm: rename kvm_irqchip_[add,remove]_irqfd_notifier with gsi suffix
  kvm-all.c: add qemu_irq/gsi hash table and utility routines
  intc: arm_gic_kvm: set the qemu_irq/gsi mapping
  sysbus: add irq_routing_notifier
  hw/vfio/platform: add irqfd support

 hw/arm/sysbus-fdt.c                             |  72 +++
 hw/core/sysbus.c                                |   6 +
 hw/intc/arm_gic_kvm.c                           |   5 +
 hw/s390x/virtio-ccw.c                           |   8 +-
 hw/vfio/Makefile.objs                           |   2 +
 hw/vfio/calxeda-xgmac.c                         |  54 ++
 hw/vfio/pci.c                                   |   6 +-
 hw/vfio/platform.c                              | 723
 hw/virtio/virtio-pci.c                          |   4 +-
 include/hw/sysbus.h                             |   1 +
 include/hw/vfio/vfio-calxeda-xgmac.h            |  46 ++
 include/hw/vfio/vfio-common.h                   |   1 +
 include/hw/vfio/vfio-platform.h                 |  77 +++
 include/standard-headers/linux/virtio_balloon.h |  28 +-
 include/standard-headers/linux/virtio_blk.h     |   8 +-
 include/standard-headers/linux/virtio_ids.h     |   1 +
 include/standard-headers/linux/virtio_input.h   |  76 +++
 include/sysemu/kvm.h                            |  11 +-
 kvm-all.c                                       |  44 +-
 kvm-stub.c                                      |   7 +-
 linux-headers/asm-arm/kvm.h                     |   9 +-
 linux-headers/asm-arm64/kvm.h                   |   9 +-
 linux-headers/asm-mips/kvm.h                    | 164 +++---
 linux-headers/asm-s390/kvm.h                    |   4 +
 linux-headers/asm-x86/hyperv.h                  |   2 +
 linux-headers/linux/kvm.h                       |  66 ++-
 linux-headers/linux/vfio.h                      |   2 +
 trace-events                                    |  13 +
 28 files changed, 1362 insertions(+), 87 deletions(-)
 create mode 100644 hw/vfio/calxeda-xgmac.c
 create mode 100644 hw/vfio/platform.c
 create mode 100644 include/hw/vfio/vfio-calxeda-xgmac.h
 create mode 100644 include/hw/vfio/vfio-platform.h
 create mode 100644 include/standard-headers/linux/virtio_input.h


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