[Xen-devel] [RFC PATCH 0/1] Add pci_hole_min_size

[Don Slutz <dslutz@xxxxxxxxxxx>]

Changes from v1 to v2:
  Boris Ostrovsky:
    Need to init pci_hole_min_size

  Changed the qemu name from pci_hole_min_size to
  pc-memory-layout.max-ram-below-4g.

  Did not change the Xen version for now.

  Added quick note to xl.cfg.pod.5

  Added a check for a too big value. (Most likely in the wrong place.)

If you add enough PCI devices then all mmio may not fit below 4G
which may not be the layout the user wanted. This allows you to
increase the below 4G address space that PCI devices can use and
therefore in more cases not have any mmio that is above 4G.

There are real PCI cards that do not support mmio over 4G, so if you
want to emulate them precisely, you may also need to increase the
space below 4G for them.  There are drivers for these cards that
also do not work if they have their mmio space mapped above 4G.

This is posted as an RFC because you need the upstream version of
qemu with all 4 patches:

http://marc.info/?l=qemu-devel&m=139455360016654&w=2

This allows growing the pci_hole to the size needed.

This may help with using pci passthru and HVM.



Don Slutz (1):
  Add pci_hole_min_size

 docs/man/xl.cfg.pod.5          | 10 ++++++++++
 tools/firmware/hvmloader/pci.c | 12 ++++++++++++
 tools/libxc/xc_hvm_build_x86.c | 22 ++++++++++++++++++++++
 tools/libxc/xenguest.h         | 11 +++++++++++
 tools/libxl/libxl_create.c     |  4 +++-
 tools/libxl/libxl_dm.c         | 15 +++++++++++++++
 tools/libxl/libxl_dom.c        |  3 ++-
 tools/libxl/libxl_types.idl    |  1 +
 tools/libxl/xl_cmdimpl.c       |  6 ++++++
 9 files changed, 82 insertions(+), 2 deletions(-)

-- 
1.8.4


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