Re: [Qemu-devel] [RFC PATCH v4 0/3] reload kernel/initrd/elf images when reset

[Yin Olivia-R63875]

I test loading the same images on X86/PowerPC platforms.

Size of image files:
 3432K    uImage
80948K   vmlinux
25180K   ramdisk

Test 1) X86
$ qemu-system-ppc -M mpc8544ds -cpu MPC8544 -kernel vmlinux -initrd ramdisk -m 
256M -nographic
$ qemu-system-ppc -M mpc8544ds -cpu MPC8544 -kernel uImage -initrd ramdisk -m 
256M -nographic

------------------------------------------------------------------
                                Pmap of QEMU on X86
------------------------------------------------------------------
                                        |       vmlinux |       uImage  
------------------------------------------------------------------
                        | boot  |       500044K |       498484K
Upstream                | reset 1       |-      500176K |-      498616K 
                        | reset 2       |       500176K |       498616K 
------------------------------------------------------------------
                        | boot  |       476000K |       469440K
                        | reset 1       |-      495640K |-      491472K
                        | reset 2       |       497024K |       491472K
Loader patches  | reset 3       |       498412K |       491472K
                        | reset 4       |       499796K |       491472K
                        | reset 5       |       501184K |       491472K
                        | reset 6       |       502568K |       491472K
------------------------------------------------------------------
        Saving                  |         4536K |         7144K
------------------------------------------------------------------

Test 2) Freescale MPC8572DS (e500v2 core) board
# qemu-system-ppc -enable-kvm -m 256 -nographic -M mpc8544ds -kernel vmlinux 
-initrd ramdisk -append "root=/dev/ram rw loglevel=7 console=ttyS0,115200" 
-serial tcp::4445,server -net nic
# qemu-system-ppc -enable-kvm -m 256 -nographic -M mpc8544ds -kernel uImage 
-initrd ramdisk -append "root=/dev/ram rw loglevel=7 console=ttyS0,115200" 
-serial tcp::4445,server -net nic

------------------------------------------------------------------
                        Pmap of QEMU on MPC8472DS board
------------------------------------------------------------------
                                        |       vmlinux |       uImage  
------------------------------------------------------------------
                        | pre boot      |        16240K |        16240K
                        | boot  |       322092K |       320500K
Upstream                | reset 1       |-      322092K |-      320500K 
                        | reset 2       |       322092K |       320500K 
------------------------------------------------------------------
                        | pre boot      |        16244K |        16244K
                        | boot  |       291476K |       288252K
                        | reset 1       |-      292868K |-      288252K
Loader patches  | reset 2       |       294260K |       288252K
                        | reset 3       |       295652K |       288252K
                        | reset 4       |       297044K |       288252K
                        | reset 5       |       298436K |       288252K
                        | reset 6       |       299828K |       288252K
------------------------------------------------------------------
        Saving                  |        29224K |        32248K
------------------------------------------------------------------


Best Regards,
Olivia

> -----Original Message-----
> From: Yin Olivia-R63875
> Sent: Wednesday, November 14, 2012 9:29 PM
> To: address@hidden; address@hidden
> Cc: Yin Olivia-R63875
> Subject: [RFC PATCH v4 0/3] reload kernel/initrd/elf images when reset
> 
> The current model of loader copy "rom blobs" and kept in memory until a
> reset occurs and waste host memory.
> 
> This serial of patches uses private reset handlers to load from hard disk
> on reset, which could make loader framework more dynamic and reduce the
> memory consumption of QEMU process.
> 
> Olivia Yin (3):
>   use image_file_reset to reload initrd image
>   use uimage_reset to reload uimage
>   use elf_reset to reload elf image
> 
>  elf.h        |   10 ++++++
>  hw/elf_ops.h |  101
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/loader.c  |  103 +++++++++++++++++++++++++++++++++++++++++++++++-----
> -----
>  hw/loader.h  |    7 ++++
>  4 files changed, 203 insertions(+), 18 deletions(-)
> ---
> 
> v4:
>  uImage/vmlinux/ramdisk had been verified on PowerPC platforms.
> Issue:
>  It seemed that the patch 3/3 could not free the memory for phdr, and the
> memory map of QEMU will increase 1392K every time.
>  If free phdr, system_reset will cause segmentation fault.