[Qemu-devel] [RFC/PoC PATCH 0/3] support initrd size up to 4G

[Li Zhijian]

Long long ago, linux kernel have supported up to 4G initrd, but it's header 
still
hard code to allow 2G - 1 only.
 # (Header version 0x0203 or later) the highest safe address for the contents
 # of an initrd. The current kernel allows up to 4 GB, but leave it at 2 GB to
 # avoid possible bootloader bugs.

kexec is one of the known scenario which has supported up to 4G initrd.

This patches is to enable up to 4G initrd, Seabios + optionrom(linuxboot_dma)
works as expected so far.

3/3 has a huge change of address/memory APIs.
I replace 'int len' in a stupid way, but it looks not safety.
$ sed -i 's/int len/uint32_t len/' exec.c
$ make # and check compiling errors
$ sed -i 's/int len/uint32_t len/' cpu-all.h
$ make -i 's/int len/uint32_t len/' include/exec/cpu-common.h
$ make -i 's/int len/uint32_t len/' include/exec/memory.h
$ make # all errors gone

CC: Paolo Bonzini <address@hidden>
CC: Peter Crosthwaite <address@hidden>
CC: Richard Henderson <address@hidden>

Li Zhijian (3):
  i386: set initrd_max to 4G - 1 to allow up to 4G initrd
  change size type from int to int64_t on load_image()
  change int len to uin32_t len

 exec.c                    | 42 +++++++++++++++++++++---------------------
 hw/core/loader.c          |  3 ++-
 hw/i386/pc.c              |  6 ++++++
 include/exec/cpu-all.h    |  2 +-
 include/exec/cpu-common.h | 10 +++++-----
 include/exec/memory.h     | 20 ++++++++++----------
 6 files changed, 45 insertions(+), 38 deletions(-)

-- 
2.7.4