[Qemu-devel] [PATCH qemu v17 00/12] spapr: vfio: Enable Dynamic DMA windows (DDW)

[Qemu-devel] [PATCH qemu v17 00/12] spapr: vfio: Enable Dynamic DMA windows (DDW)

[Alexey Kardashevskiy]

Each Partitionable Endpoint (IOMMU group) has an address range on a PCI bus
where devices are allowed to do DMA. These ranges are called DMA windows.
By default, there is a single DMA window, 1 or 2GB big, mapped at zero
on a PCI bus.

PAPR defines a DDW RTAS API which allows pseries guests
querying the hypervisor about DDW support and capabilities (page size mask
for now). A pseries guest may request an additional (to the default)
DMA windows using this RTAS API.
The existing pseries Linux guests request an additional window as big as
the guest RAM and map the entire guest window which effectively creates
direct mapping of the guest memory to a PCI bus.

This patchset reworks PPC64 IOMMU code and adds necessary structures
to support big windows on pseries.

This patchset is based on David's ppc-for-2.7-20160531 tag.


Please comment. Thanks!


Alexey Kardashevskiy (12):
  vmstate: Define VARRAY with VMS_ALLOC
  spapr_iommu: Introduce "enabled" state for TCE table
  spapr_iommu: Migrate full state
  spapr_iommu: Add root memory region
  spapr_pci: Reset DMA config on PHB reset
  memory: Add reporting of supported page sizes
  vfio: spapr: Add DMA memory preregistering (SPAPR IOMMU v2)
  spapr_pci: Add and export DMA resetting helper
  vfio: Add host side DMA window capabilities
  vfio/spapr: Create DMA window dynamically (SPAPR IOMMU v2)
  spapr_pci/spapr_pci_vfio: Support Dynamic DMA Windows (DDW)
  spapr_iommu, vfio, memory: Notify IOMMU about starting/stopping
    listening

 hw/ppc/Makefile.objs          |   1 +
 hw/ppc/spapr.c                |   5 +
 hw/ppc/spapr_iommu.c          | 160 +++++++++++++++++++----
 hw/ppc/spapr_pci.c            |  96 ++++++++++----
 hw/ppc/spapr_rtas_ddw.c       | 293 ++++++++++++++++++++++++++++++++++++++++++
 hw/ppc/spapr_vio.c            |   8 +-
 hw/vfio/Makefile.objs         |   1 +
 hw/vfio/common.c              | 174 +++++++++++++++++++------
 hw/vfio/spapr.c               | 207 +++++++++++++++++++++++++++++
 include/exec/memory.h         |  26 +++-
 include/hw/pci-host/spapr.h   |  10 +-
 include/hw/ppc/spapr.h        |  30 ++++-
 include/hw/vfio/vfio-common.h |  19 ++-
 include/migration/vmstate.h   |  10 ++
 memory.c                      |  26 +++-
 trace-events                  |  10 ++
 16 files changed, 961 insertions(+), 115 deletions(-)
 create mode 100644 hw/ppc/spapr_rtas_ddw.c
 create mode 100644 hw/vfio/spapr.c

-- 
2.5.0.rc3

Re: [Qemu-devel] [PATCH qemu v17 00/12] spapr: vfio: Enable Dynamic DMA windows (DDW)

[David Gibson]

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On Wed, Jun 01, 2016 at 06:57:31PM +1000, Alexey Kardashevskiy wrote:
> Each Partitionable Endpoint (IOMMU group) has an address range on a PCI bus
> where devices are allowed to do DMA. These ranges are called DMA windows.
> By default, there is a single DMA window, 1 or 2GB big, mapped at zero
> on a PCI bus.
> 
> PAPR defines a DDW RTAS API which allows pseries guests
> querying the hypervisor about DDW support and capabilities (page size mask
> for now). A pseries guest may request an additional (to the default)
> DMA windows using this RTAS API.
> The existing pseries Linux guests request an additional window as big as
> the guest RAM and map the entire guest window which effectively creates
> direct mapping of the guest memory to a PCI bus.
> 
> This patchset reworks PPC64 IOMMU code and adds necessary structures
> to support big windows on pseries.
> 
> This patchset is based on David's ppc-for-2.7-20160531 tag.
> 
> 
> Please comment. Thanks!

I've merged 1-5.  6 needs some sort of ack from Paolo.  Continuing to
review the remainder.

> 
> 
> Alexey Kardashevskiy (12):
>   vmstate: Define VARRAY with VMS_ALLOC
>   spapr_iommu: Introduce "enabled" state for TCE table
>   spapr_iommu: Migrate full state
>   spapr_iommu: Add root memory region
>   spapr_pci: Reset DMA config on PHB reset
>   memory: Add reporting of supported page sizes
>   vfio: spapr: Add DMA memory preregistering (SPAPR IOMMU v2)
>   spapr_pci: Add and export DMA resetting helper
>   vfio: Add host side DMA window capabilities
>   vfio/spapr: Create DMA window dynamically (SPAPR IOMMU v2)
>   spapr_pci/spapr_pci_vfio: Support Dynamic DMA Windows (DDW)
>   spapr_iommu, vfio, memory: Notify IOMMU about starting/stopping
>     listening
> 
>  hw/ppc/Makefile.objs          |   1 +
>  hw/ppc/spapr.c                |   5 +
>  hw/ppc/spapr_iommu.c          | 160 +++++++++++++++++++----
>  hw/ppc/spapr_pci.c            |  96 ++++++++++----
>  hw/ppc/spapr_rtas_ddw.c       | 293 ++++++++++++++++++++++++++++++++++++++++++
>  hw/ppc/spapr_vio.c            |   8 +-
>  hw/vfio/Makefile.objs         |   1 +
>  hw/vfio/common.c              | 174 +++++++++++++++++++------
>  hw/vfio/spapr.c               | 207 +++++++++++++++++++++++++++++
>  include/exec/memory.h         |  26 +++-
>  include/hw/pci-host/spapr.h   |  10 +-
>  include/hw/ppc/spapr.h        |  30 ++++-
>  include/hw/vfio/vfio-common.h |  19 ++-
>  include/migration/vmstate.h   |  10 ++
>  memory.c                      |  26 +++-
>  trace-events                  |  10 ++
>  16 files changed, 961 insertions(+), 115 deletions(-)
>  create mode 100644 hw/ppc/spapr_rtas_ddw.c
>  create mode 100644 hw/vfio/spapr.c
> 

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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