[Qemu-ppc] [PATCH v10 0/4] reload images from host rootfs on reset to save footprint

[Olivia Yin]

The current model of loader copy "rom blobs" and kept in memory until a reset
occurs and waste host memory.

This serial of patches set uimage/initrd/vmlinux as reloadable images and use
private reset handlers to load these images from hard disk on reset, which 
could 
make loader framework more dynamic and reduce the memory consumption of QEMU
process.

Provides new API do_info_images() to display the information about the 
reloadable
images (uImage/initrd/vmlinux).

Olivia Yin (4):
  use image_file_reset to reload initrd
  use uimage_reset to reload uImage
  use elf_reset to reload elf image
  use info images to check images which could be reloaded on reset

 hw/elf_ops.h       |   54 +++++++++++++++++--
 hw/loader.c        |  147 +++++++++++++++++++++++++++++++++++++++++++++-------
 hw/loader.h        |   36 +++++++++++--
 hw/ppc/e500.c      |    2 +-
 hw/ppc440_bamboo.c |    2 +-
 monitor.c          |    7 +++
 6 files changed, 218 insertions(+), 30 deletions(-)

v10:
patch 2/4: add error check in uimage_reset() and remove UImageFile structure 
patch 4/4: modify the format of 'info images'
           For example,
(qemu) info images
ImageType                       File                    PhyAddr                 
MemSize
uImage                         /media/ram/uImage        0000000000000000        
0x7a28c0
raw                           /media/ram/ramdisk        0000000002000000        
0x3f922f

(qemu) info images
ImageType                       File                    PhyAddr                 
MemSize
ELF                  phdr #0: /media/ram/vmlinux        0000000000000000        
0x709a0c
raw                           /media/ram/ramdisk        0000000002000000        
0x3f922f

v9: 
patch 4/4: set uimage/initrd/vmlinux as reloadable and free them on rom_reset;
           use 'info images' to display the information of reloadable images

For example,
(qemu) info images
load_addr=0000000000000000 size=0x07cac80 type=UIMAGE file="uImage"
load_addr=0000000002000000 size=0x188e844 type=FLAT file="ramdisk"

(qemu) info images
load_addr=0000000000000000 size=0x0709a0c type=FLAT file="vmlinux"
load_addr=0000000002000000 size=0x188e844 type=FLAT file="ramdisk"


v8: unify the structure ImageFile for uimage/initrd/vmlinux, and remove 
rom_reset().

v7: clean structure ImageFile

v6:
patch 3/4: load symbol only when startup

v5: 
patch 2/4: remove global variables is_linux and kernel_loaded.
patch 3/4: register reset handlers in loader.c for elf images.
           extract the duplicated source code into function elf_phy_loader().
patch 4/4: fix the issue of memory increasing (about 1.4MB) once reload elf 
image.

v4: fix elf reload and register reset handler in hw/elf_ops.h

v3: reload elf

v2: Rename target_phys_addr_t to hwaddr

v1: support uimage/initrd reload