This RFC series aims at enabling KVM platform device passthrough.
It implements a VFIO platform device, derived from VFIO PCI device.
The VFIO platform device uses the host VFIO platform driver which must
be bound to the assigned device prior to the QEMU system start.
- the guest can directly access the device register space
- assigned device IRQs are transparently routed to the guest by
QEMU/KVM (3 methods currently are supported: user-level eventfd
handling, irqfd, forwarded IRQs)
- iommu is transparently programmed to prevent the device from
accessing physical pages outside of the guest address space
This patch series is made of the following patch file groups:
1-8) PCI modifications to prepare for platform device introduction
9-12) VFIO platform device without irqfd support
13) VFIO platform device with irqfd support
14-16) VFIO platform device with IRQ forwarding support
Each group is independent and should be separately upstreamable.
Dependency List:
QEMU dependencies:
[1] [PATCH v3 0/7] Dynamic sysbus device allocation support, Alex Graf
http://lists.nongnu.org/archive/html/qemu-devel/2014-09/msg04860.html
[2] [PATCH v4] machvirt dynamic sysbus device instantiation, Eric Auger
[3] [PATCH v3 0/2] actual checks of KVM_CAP_IRQFD and KVM_CAP_IRQFD_RESAMPLE,
Eric Auger
http://lists.nongnu.org/archive/html/qemu-devel/2014-09/msg00589.html
[4] [PATCH v2] vfio: migration to trace points, Eric Auger
https://patchwork.ozlabs.org/patch/394785/
Kernel Dependencies:
[5] [PATCH v9 00/19] VFIO support for platform and AMBA devices on ARM
http://comments.gmane.org/gmane.linux.kernel.iommu/7096
[6] [PATCH v3] ARM: KVM: add irqfd support, Eric Auger
https://lkml.org/lkml/2014/9/1/141
[8] [RFC v2 0/9] KVM-VFIO IRQ forward control, Eric Auger
https://lkml.org/lkml/2014/9/1/344
[9] [RFC PATCH 0/9] ARM: Forwarding physical interrupts to a guest VM,
Marc Zyngier
http://lwn.net/Articles/603514/
- kernel pieces can be found at:
http://git.linaro.org/people/eric.auger/linux.git (branch 3.17rc7-v8)
- QEMU pieces can be found at:
http://git.linaro.org/people/eric.auger/qemu.git (branch vfio_integ_v7)
The patch series was tested on Calxeda Midway (ARMv7) where one xgmac
is assigned to KVM host while the second one is assigned to the guest.
Reworked PCI device is not tested.
Wiki for Calxeda Midway setup:
https://wiki.linaro.org/LEG/Engineering/Virtualization/Platform_Device_Passthrough_on_Midway
History:
v6->v7:
- 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.
v5->v6:
- 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)
v4->v5:
- 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
hw/arm/dyn_sysbus_devtree.c
- 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
tested
- 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
Eric
Eric Auger (15):
hw/vfio/pci: Rename VFIODevice into VFIOPCIDevice
hw/vfio/pci: introduce VFIODevice
hw/vfio/pci: Introduce VFIORegion
hw/vfio/pci: split vfio_get_device
hw/vfio/pci: rename group_list into vfio_group_list
hw/vfio/pci: use name field in format strings
hw/vfio: create common module
hw/vfio/platform: add vfio-platform support
hw/vfio: calxeda xgmac device
hw/arm/virt: add support for VFIO devices
hw/arm/sysbus-fdt: enable vfio-calxeda-xgmac dynamic instantiation
hw/vfio/platform: Add irqfd support
linux-headers: Update KVM headers from linux-next tag ToBeFilled
hw/vfio/common: vfio_kvm_device_fd moved in the common header
hw/vfio/platform: add forwarded irq support
Kim Phillips (1):
vfio: move hw/misc/vfio.c to hw/vfio/pci.c Move vfio.h into
include/hw/vfio
LICENSE | 2 +-
MAINTAINERS | 2 +-
hw/Makefile.objs | 1 +
hw/arm/sysbus-fdt.c | 88 ++
hw/arm/virt.c | 9 +
hw/misc/Makefile.objs | 1 -
hw/ppc/spapr_pci_vfio.c | 2 +-
hw/vfio/Makefile.objs | 6 +
hw/vfio/calxeda_xgmac.c | 54 ++
hw/vfio/common.c | 959 +++++++++++++++++++
hw/{misc/vfio.c => vfio/pci.c} | 1671 +++++++---------------------------
hw/vfio/platform.c | 820 +++++++++++++++++
include/hw/vfio/vfio-calxeda-xgmac.h | 41 +
include/hw/vfio/vfio-common.h | 157 ++++
include/hw/vfio/vfio-platform.h | 90 ++
include/hw/{misc => vfio}/vfio.h | 0
linux-headers/linux/kvm.h | 9 +
trace-events | 137 +--
18 files changed, 2636 insertions(+), 1413 deletions(-)
create mode 100644 hw/vfio/Makefile.objs
create mode 100644 hw/vfio/calxeda_xgmac.c
create mode 100644 hw/vfio/common.c
rename hw/{misc/vfio.c => vfio/pci.c} (65%)
create mode 100644 hw/vfio/platform.c
create mode 100644 include/hw/vfio/vfio-calxeda-xgmac.h
create mode 100644 include/hw/vfio/vfio-common.h
create mode 100644 include/hw/vfio/vfio-platform.h
rename include/hw/{misc => vfio}/vfio.h (100%)
--
1.8.3.2
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