[RFC PATCH 0/3] Implement the XEN_DOMCTL_memory_mapping hypecall for arm32

[Arianna Avanzini <avanzini.arianna@gmail.com>]

Hello,

this patchset adds a first attempt of implementation of the
XEN_DOMCTL_memory_mapping hypercall for the arm32 architecture.

As a part of my thesis project (developed with Paolo Valente,
in Italy, [1]), I am porting an automotive-grade real-time OS
(Evidence's ERIKA Enterprise, [2], [3]) on Xen on ARM, and the
port of the OS as a domU has required the OS to be able to access
peripherals performing memory-mapped I/O; as a consequence, the
I/O-memory ranges related to such peripherals had to be made
accessible to the domU.

I have been working on this patchset for the last weeks after reading
a related xen-devel discussion ([4]), and I had no idea that Eric Trudeau
had already proposed to this mailing list an implementation of the
hypercall ([5], [6]). Any comment is obviously welcome on this point, and if
he wants so I will of course add his Signed-off-by to the patches.

Any feedback about the patches is more than welcome. The code has been
tested with Linux v3.13 as dom0 and ERIKA Enterprise as domU.

[1] http://www.unimore.it/
[2] http://www.evidence.eu.com/
[3] http://erika.tuxfamily.org/drupal/
[4] http://lists.xen.org/archives/html/xen-devel/2013-06/msg00870.html
[5] http://marc.info/?l=xen-devel&m=137338996422503
[6] http://lists.xen.org/archives/html/xen-devel/2014-02/msg02514.html

Arianna Avanzini (3):
  arch, arm32: add definition of paddr_bits
  arch, arm32: add the XEN_DOMCTL_memory_mapping hypercall
  tools, libxl: handle the iomem parameter with the memory_mapping hcall

 tools/libxl/libxl_create.c      | 10 ++++++
 xen/arch/arm/arm32/cpu.h        |  7 ++++
 xen/arch/arm/arm32/domctl.c     | 74 +++++++++++++++++++++++++++++++++++++++++
 xen/arch/arm/p2m.c              |  9 +++++
 xen/include/asm-arm/p2m.h       |  2 ++
 xen/include/asm-arm/processor.h |  2 ++
 6 files changed, 104 insertions(+)
 create mode 100644 xen/arch/arm/arm32/cpu.h

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1.8.5.3