[Qemu-devel] [RFC PATCH 0/4] VHDX Read support

[Jeff Cody]

This is preliminary support for VHDX images, based on the spec:

  "VHDX Format Specification v0.95", published 4/12/2012
   https://www.microsoft.com/en-us/download/details.aspx?id=29681

My working git repo for this work is:
https://github.com/codyprime/qemu-kvm-jtc/commits/jtc-vhdx-work-rfc1
git://github.com/codyprime/qemu-kvm-jtc.git  branch jtc-vhdx-work-rfc1

Debug prints can be ignored, as they are just there for development.

A lot of error handling is not in place yet, and write support
is missing.  Also missing is support for differencing files.

This works well enough to mount a VHDX image (with readonly=on), and
read the content.

Work in progress (will be available in my git repo):
    - write support
    - differencing file support
    - more error handling
    - read performance improvements (coroutines, etc.)
    - split some of the functions out of the vhdx.c file
      (e.g. region / metdata handling)

Any comments are welcome

Jeff Cody (4):
  qemu: add castagnoli crc32c checksum algorithm
  block: vhdx header for the QEMU support of VHDX images
  block: VHDX block driver support
  block: add vhdx to Makefile.obj for compile

 block/Makefile.objs   |   1 +
 block/vhdx.c          | 814 ++++++++++++++++++++++++++++++++++++++++++++++++++
 block/vhdx.h          | 349 ++++++++++++++++++++++
 include/qemu/crc32c.h |  35 +++
 util/Makefile.objs    |   1 +
 util/crc32c.c         | 115 +++++++
 6 files changed, 1315 insertions(+)
 create mode 100644 block/vhdx.c
 create mode 100644 block/vhdx.h
 create mode 100644 include/qemu/crc32c.h
 create mode 100644 util/crc32c.c

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1.8.1.2