[RFC][v3][PATCH 0/6] xen: reserve RMRR to avoid conflicting MMIO/RAM

[Tiejun Chen <tiejun.chen@intel.com>]

v3:

* Use XENMEM_reserved_device_memory_map to replace XENMEM_RMRR_memory_map
* Then rebase all patches

v2:

* Don't use e820map to define RMRR maps directly to avoid any confusion.
* In patch #3 we introduce construct_rmrr_e820_maps() to check if we can
  insert RMRR maps and then we will sort all e820 entries.
* Clean patch #4
* In patch #5 we reuse check_mmio_hole() to check if current mmio range is
  fine to RMRR maps. If not, we just issue error to notify the user since
  mostly mmio should be configured again.

While we work for supporting RMRR mapping for Windows GFX driver in case
shared table,

http://osdir.com/ml/general/2014-07/msg55347.html
http://osdir.com/ml/general/2014-07/msg55348.html

we realize we should reserve RMRR range to avoid any potential MMIO/RAM
overlap with our discussion so here these preliminary patches are intended
to cover this.

----------------------------------------------------------------
Tiejun Chen (6):
      xen:x86: record RMRR mappings
      xen:x86: introduce a new hypercall to get RMRR mappings
      tools:firmware:hvmloader: reserve RMRR mappings in e820
      xen:x86: add XENMEM_reserved_device_memory_map to expose RMRR
      tools:libxc: check if mmio BAR is out of RMRR mappings
      xen:vtd: make USB RMRR mapping safe

 tools/firmware/hvmloader/e820.c     | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/firmware/hvmloader/e820.h     |  6 ++++++
 tools/firmware/hvmloader/util.c     | 16 ++++++++++++++++
 tools/firmware/hvmloader/util.h     |  2 ++
 tools/libxc/xc_domain.c             | 26 ++++++++++++++++++++++++++
 tools/libxc/xc_hvm_build_x86.c      | 23 +++++++++++++++++++++++
 tools/libxc/xenctrl.h               |  4 ++++
 xen/arch/x86/e820.c                 |  2 ++
 xen/arch/x86/mm.c                   | 32 ++++++++++++++++++++++++++++++++
 xen/arch/x86/x86_64/compat/mm.c     |  9 +++++++++
 xen/drivers/passthrough/vtd/dmar.c  | 14 ++++++++++++++
 xen/drivers/passthrough/vtd/iommu.c |  8 --------
 xen/include/asm-x86/e820.h          |  3 +++
 xen/include/public/memory.h         | 14 +++++++++++++-
 14 files changed, 244 insertions(+), 9 deletions(-)

Thanks
Tiejun