Re: [Qemu-devel] [RFC][PATCH 0/5] backdoor: lightweight guest-to-QEMU backdoor channel

[Blue Swirl]

2011/9/29 Anthony Liguori <address@hidden>:
> On 09/29/2011 08:47 AM, Lluís Vilanova wrote:
>>
>> Provides the ability for the guest to communicate with user-provided code
>> inside
>> QEMU itself, using a lightweight mechanism.
>>
>> See first commit for a full description.
>>
>> Signed-off-by: Lluís Vilanova<address@hidden>
>
> We already have two "backdoors" in QEMU: ivshmem and virtio-serial.  Can you
> discuss why these are insufficient for your purposes?
>
> Also, what's the advantage of having a backdoor mechanism both for softmmu
> and user?  I can't think of a practical use-case for it.

This can be used for instrumentation and maybe it could be used for
test setups too instead of a dedicated test device.

> Regards,
>
> Anthony Liguori
>
>> ---
>>
>> Lluís Vilanova (5):
>>       backdoor: Add documentation
>>       backdoor: Add build infrastructure
>>       backdoor: [*-user] Add QEMU-side proxy to "libbackdoor.a"
>>       backdoor: [softmmu] Add QEMU-side proxy to "libbackdoor.a"
>>       backdoor: Add guest-side library
>>
>>
>>  Makefile                       |    3 -
>>  Makefile.objs                  |   21 ++++
>>  Makefile.target                |    4 +
>>  backdoor/guest/Makefile        |   18 ++++
>>  backdoor/guest/common.c        |  130 +++++++++++++++++++++++++++
>>  backdoor/guest/qemu-backdoor.h |   50 ++++++++++
>>  backdoor/qemu/qemu-backdoor.h  |   29 ++++++
>>  backdoor/qemu/softmmu.c        |  124 ++++++++++++++++++++++++++
>>  backdoor/qemu/user.c           |  194
>> ++++++++++++++++++++++++++++++++++++++++
>>  backdoor/qemu/user.h           |   17 ++++
>>  bsd-user/main.c                |   25 +++++
>>  bsd-user/mmap.c                |    7 +
>>  configure                      |   35 +++++++
>>  darwin-user/main.c             |   25 +++++
>>  darwin-user/mmap.c             |    7 +
>>  docs/backdoor.txt              |  144 ++++++++++++++++++++++++++++++
>>  hw/pci.h                       |    1
>>  linux-user/main.c              |   30 ++++++
>>  linux-user/mmap.c              |    7 +
>>  19 files changed, 869 insertions(+), 2 deletions(-)
>>  create mode 100644 backdoor/guest/Makefile
>>  create mode 100644 backdoor/guest/common.c
>>  create mode 100644 backdoor/guest/qemu-backdoor.h
>>  create mode 100644 backdoor/qemu/qemu-backdoor.h
>>  create mode 100644 backdoor/qemu/softmmu.c
>>  create mode 100644 backdoor/qemu/user.c
>>  create mode 100644 backdoor/qemu/user.h
>>  create mode 100644 docs/backdoor.txt
>>
>>
>
>
>