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Re: [Qemu-ppc] [RFC PATCH 00/10] spapr: vfio: Enable Dynamic DMA windows
From: |
Alexey Kardashevskiy |
Subject: |
Re: [Qemu-ppc] [RFC PATCH 00/10] spapr: vfio: Enable Dynamic DMA windows (DDW) |
Date: |
Tue, 05 Aug 2014 11:30:42 +1000 |
User-agent: |
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
On 07/31/2014 07:34 PM, Alexey Kardashevskiy wrote:
> At the moment sPAPR PHB supports only a single 32bit window
> which is normally 1..2GB which is not enough for high performance devices.
>
> PAPR spec enables creating an additional window(s) to support 64bit
> DMA and bigger page sizes.
>
> This patchset adds DDW support for pseries. The host kernel changes are
> required.
>
> This was tested on POWER8 system which allows one additional DMA window
> which is mapped at 0x800.0000.0000.0000 and supports 16MB pages.
> Existing guests check for DDW capabilities in PHB's device tree and if it
> is present, they request for an additional window and map entire guest RAM
> using H_PUT_TCE/... hypercalls once at boot time and switch to direct DMA
> operations.
>
> TCE tables still may be big enough for guests backed with 64K pages but they
> are reasonably small for guests backed by 16MB pages.
>
> Please comment. Thanks!
Alexander Graf, ping!
> Alexey Kardashevskiy (10):
> qom: Make object_child_foreach safe for objects removal
> spapr_iommu: Disable in-kernel IOMMU tables for >4GB windows
> spapr_pci: Make find_phb()/find_dev() public
> spapr_iommu: Make spapr_tce_find_by_liobn() public
> linux headers update for DDW
> spapr_rtas: Add Dynamic DMA windows (DDW) RTAS calls support
> spapr: Add "ddw" machine option
> spapr_pci: Enable DDW
> spapr_pci_vfio: Enable DDW
> vfio: Enable DDW ioctls to VFIO IOMMU driver
>
> hw/misc/vfio.c | 4 +
> hw/ppc/Makefile.objs | 3 +
> hw/ppc/spapr.c | 15 +++
> hw/ppc/spapr_iommu.c | 8 +-
> hw/ppc/spapr_pci.c | 87 +++++++++++--
> hw/ppc/spapr_pci_vfio.c | 75 +++++++++++
> hw/ppc/spapr_rtas_ddw.c | 296
> ++++++++++++++++++++++++++++++++++++++++++++
> include/hw/pci-host/spapr.h | 27 ++++
> include/hw/ppc/spapr.h | 7 +-
> linux-headers/linux/vfio.h | 37 +++++-
> qom/object.c | 4 +-
> trace-events | 4 +
> vl.c | 4 +
> 13 files changed, 552 insertions(+), 19 deletions(-)
> create mode 100644 hw/ppc/spapr_rtas_ddw.c
>
--
Alexey
- Re: [Qemu-ppc] [RFC PATCH 00/10] spapr: vfio: Enable Dynamic DMA windows (DDW),
Alexey Kardashevskiy <=