Re: [Qemu-devel] [PATCH 00/11 v10] introducing a new, dedicated guest memory dump mechanism

[Wen Congyang]

Does anyone have time to review this patchset?

Thanks
Wen Congyang

At 03/20/2012 11:28 AM, Wen Congyang Wrote:
> Hi, all
> 
> 'virsh dump' can not work when host pci device is used by guest. We have
> discussed this issue here:
> http://lists.nongnu.org/archive/html/qemu-devel/2011-10/msg00736.html
> 
> The last version is here:
> http://lists.nongnu.org/archive/html/qemu-devel/2012-03/msg02536.html
> 
> We have determined to introduce a new command dump-guest-memory to dump
> guest's memory. The core file's format is elf32 or elf64.
> 
> Note:
> 1. The guest should be x86 or x86_64. The other arch is not supported now.
> 2. If you use old gdb, gdb may crash. I use gdb-7.3.1, and it does not crash.
> 3. If the OS is in the second kernel, gdb may not work well, and crash can
>    work by specifying '--machdep phys_addr=xxx' in the command line. The
>    reason is that the second kernel will update the page table, and we can
>    not get the page table for the first kernel.
> 4. The cpu's state is stored in QEMU note. You neet to modify crash to use
>    it to calculate phys_base.
> 5. If the guest OS is 32 bit and the memory size is larger than 4G, the vmcore
>    is elf64 format. You should use the gdb which is built with 
> --enable-64-bit-bfd.
> 6. This patchset is based on the upstream tree, and apply one patch that is 
> still
>    in Luiz Capitulino's tree, because I use the API qemu_get_fd() in this 
> patchset.
> 
> Changes from v9 to v10:
> 1. fix some bug
> 2. addressed Luiz's and Hatayam's comment
> 3. remove cancel and query command
> 
> Changes from v8 to v9:
> 1. remove async support(it will be reimplemented after QAPI async commands 
> support
>    is finished)
> 2. fix some typo error
> 
> Changes from v7 to v8:
> 1. addressed Hatayama's comments
> 
> Changes from v6 to v7:
> 1. addressed Jan's comments
> 2. fix some bugs
> 3. store cpu's state into the vmcore
> 
> Changes from v5 to v6:
> 1. allow user to dump a fraction of the memory
> 2. fix some bugs
> 
> Changes from v4 to v5:
> 1. convert the new command dump to QAPI 
> 
> Changes from v3 to v4:
> 1. support it to run asynchronously
> 2. add API to cancel dumping and query dumping progress
> 3. add API to control dumping speed
> 4. auto cancel dumping when the user resumes vm, and the status is failed.
> 
> Changes from v2 to v3:
> 1. address Jan Kiszka's comment
> 
> Changes from v1 to v2:
> 1. fix virt addr in the vmcore.
> 
> Wen Congyang (11):
>   Add API to create memory mapping list
>   Add API to check whether a physical address is I/O address
>   implement cpu_get_memory_mapping()
>   Add API to check whether paging mode is enabled
>   Add API to get memory mapping
>   Add API to get memory mapping without do paging
>   target-i386: Add API to write elf notes to core file
>   target-i386: Add API to write cpu status to core file
>   target-i386: add API to get dump info
>   make gdb_id() generally avialable
>   introduce a new monitor command 'dump-guest-memory' to dump guest's
>     memory
> 
>  Makefile.target                   |    3 +
>  configure                         |    8 +
>  cpu-all.h                         |   67 +++
>  cpu-common.h                      |    2 +
>  dump.c                            |  841 
> +++++++++++++++++++++++++++++++++++++
>  dump.h                            |   23 +
>  elf.h                             |    5 +
>  exec.c                            |    9 +
>  gdbstub.c                         |    9 -
>  gdbstub.h                         |    9 +
>  hmp-commands.hx                   |   28 ++
>  hmp.c                             |   22 +
>  hmp.h                             |    1 +
>  memory_mapping.c                  |  236 +++++++++++
>  memory_mapping.h                  |   68 +++
>  qapi-schema.json                  |   18 +
>  qmp-commands.hx                   |   38 ++
>  target-i386/arch_dump.c           |  425 +++++++++++++++++++
>  target-i386/arch_memory_mapping.c |  271 ++++++++++++
>  19 files changed, 2074 insertions(+), 9 deletions(-)
>  create mode 100644 dump.c
>  create mode 100644 dump.h
>  create mode 100644 memory_mapping.c
>  create mode 100644 memory_mapping.h
>  create mode 100644 target-i386/arch_dump.c
>  create mode 100644 target-i386/arch_memory_mapping.c
> 
> 
>