Re: [Qemu-devel] [RFC v1 00/22] Integrate DMA into the memory API

[Blue Swirl]

On Wed, Oct 3, 2012 at 4:03 PM, Avi Kivity <address@hidden> wrote:
> Most of the work on the memory API focused on memory access targets - the 
> memory regions
> and how they are composed into an address space.  This patchset tackles the 
> initator
> side of the question - how to originate accesses.
>
> The AddressSpace object, is exported to users and becomes the representation 
> of an
> initiator.  Each address space describes the paths from some point in the 
> system
> (a device or cpu) to the devices reachable from that initiator.
>
> As an example, the API is used to support PCI_COMMAND_MASTER bit.

Excellent patches with high cleanup potential.

>
> Avi Kivity (22):
>   memory: rename 'exec-obsolete.h'
>   vhost: use MemoryListener filtering to only monitor RAM address space
>   kvm: use separate MemoryListeners for memory and I/O
>   xen_pt: use separate MemoryListeners for memory and I/O
>   memory: prepare AddressSpace for exporting
>   memory: export AddressSpace
>   memory: maintain a list of address spaces
>   memory: provide defaults for MemoryListener operations
>   memory: use new MEMORY_LISTENER_DEFAULT_OPS
>   vfio: use new MEMORY_LISTENER_DEFAULT_OPS
>   xen_pt: use new MEMORY_LISTENER_DEFAULT_OPS
>   kvm: use new MEMORY_LISTENER_DEFAULT_OPS
>   xen: use new MEMORY_LISTENER_DEFAULT_OPS
>   memory: manage coalesced mmio via a MemoryListener
>   memory: move address_space_memory and address_space_io out of memory
>     core
>   memory: move tcg flush into a tcg memory listener
>   memory: use AddressSpace for MemoryListener filtering
>   s390: avoid reaching into memory core internals
>   memory: per-AddressSpace dispatch
>   dma: make dma access its own address space
>   pci: give each device its own address space
>   pci: honor PCI_COMMAND_MASTER
>
>  cputlb.c                             |   6 +-
>  cputlb.h                             |   3 +-
>  dma-helpers.c                        |  25 ++-
>  dma.h                                |  17 +-
>  exec-memory.h                        |   7 +-
>  exec.c                               | 312 
> ++++++++++++++---------------------
>  hw/Makefile.objs                     |   5 +-
>  hw/pci.c                             |  19 ++-
>  hw/pci.h                             |   2 +
>  hw/spapr_iommu.c                     |   3 +-
>  hw/vfio_pci.c                        |  33 +---
>  hw/vhost.c                           |   5 +-
>  hw/xen_pt.c                          |  49 +++---
>  hw/xen_pt.h                          |   1 +
>  kvm-all.c                            | 107 +++++-------
>  kvm-stub.c                           |  10 --
>  kvm.h                                |   2 -
>  exec-obsolete.h => memory-internal.h |  30 +++-
>  memory.c                             | 158 +++++++++++-------
>  memory.h                             | 122 +++++++++++++-
>  target-s390x/misc_helper.c           |   2 +-
>  xen-all.c                            |  45 +----
>  22 files changed, 487 insertions(+), 476 deletions(-)
>  rename exec-obsolete.h => memory-internal.h (87%)
>
> --
> 1.7.12
>