RFC Per Master Addressing (PMA)

Hi All,

This series implements Per-bus-Master Address spaces (PMA). It builds on the merged components of Edgar's original series:

https://lists.gnu.org/archive/html/qemu-devel/2014-02/msg01346.html

And my pending MemoryRegion QOMification:

https://lists.nongnu.org/archive/html/qemu-devel/2014-06/msg00029.html

The approach is based on PMA as discussed KVM call 2014-05-13. MOM:

http://lists.gnu.org/archive/html/qemu-devel/2014-05/msg02430.html

"
PM: Address space is flattended memory regions, needed for actual memory access when constructing machines, we deal with memory regions, not address spaces

AF+PM: Each CPU should have its own address space

...

Do busmasters get their own address space, too?
PM: Yes
"

Patches 3-9 patch memory, exec and CPU to enable this capability generally. The basic idea is MemoryRegions are QOM/linkable, and masters create their own AddressSpace as needed from their given MRs.

The PetaLogix ml605 board is converted to use the new framework as the lead example P10/11. It is tested as working. For a diagram of the real hardware setup WRT to DMA and bus master visibility:

http://www.xilinx.com/support/documentation/ip_documentation/axi_dma/v6_03_a/pg021_axi_dma.pdf

page 49.

This series is work-in-progress and has numerous FIXMEs in it. Looking for conceptual level commentary.

2 trivials at the front of the series. Easily skipped by reviewers.

Regards,
Peter

Peter Crosthwaite (11):
microblaze: ml605: Get rid of useless ddr_base variable
dma: axidma: Variablise repeated s->streams[i] sub-expr
exec: Parent root MRs to the machine
exec: dummy_section: Pass address space through.
memory: Parent Memory Regions to their registered owners
memory: address_space_init: do nothing if no root region given memory.c: Add address_space_init_shareable() qom/cpu: Add Memory Region Property
exec: use per-cpu address-spaces for cpuisms
microblaze: ml605: Convert to PMA
dma: axidma: Convert to PMA

 exec.c                              | 23 +++++++++++-------
 hw/core/loader.c                    |  2 +-
 hw/dma/xilinx_axidma.c              | 47 ++++++++++++++++++++++++++++++-------
 hw/microblaze/petalogix_ml605_mmu.c | 42 ++++++++++++++++++++++++---------
 include/exec/memory.h               |  2 ++
 include/qom/cpu.h                   |  1 +
 memory.c                            | 47 +++++++++++++++++++++++++++++++++++++
 qom/cpu.c                           | 30 +++++++++++++++++++++++
 8 files changed, 165 insertions(+), 29 deletions(-)

2.0.0