Peter Fang 3d99082411 dm: support OVMF split images ...

In addition to a single OVMF image (OVMF.fd), split images
(OVMF_CODE.fd, OVMF_VARS.fd) can be used to facilitate VM management.

From the OVMF Whitepaper:

  The variable store and the firmware executable are also available in
  the build output as separate files entitled: "OVMF_VARS.fd" and
  "OVMF_CODE.fd". This enables central management and updates of the
  firmware executable, while each virtual machine can retain its own
  variable store.

An example to launch acrn-dm with the split images:

  --ovmf code=/usr/share/acrn/bios/OVMF_CODE.fd, \
  vars=/usr/share/acrn/bios/OVMF_VARS.fd

v1 -> v2:
- use memory-mapped file I/O for writeback
- use fcntl to lock OVMF image files

Tracked-On: #5487
Signed-off-by: Peter Fang <peter.fang@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>

2020-11-11 09:53:28 +08:00

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