Re: [Qemu-devel] Adding another debug protocol

[Peter Cheung]

hi Jan, you are the maintainer of the gdb server of qemu?
I think if I can't create my debug protocol, it is not easy to adopt 
peter-bochs debugger to qemu, in peter-bochs, there are some features I think 
current gdb protocol doesn't care, such as profiling, kernel module monitoring, 
call graph history, real time address probeing.
I know qemu is made by a lots of people, seems not easy to convince everyone.

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"Jan Kiszka" <address@hidden> 於 2012年11月14日 下午11:13 寫道：

> On 2012-11-14 15:40, Peter Cheung wrote:
>> Hi   Cannot use gdb protocol, because it is slow.
> 
> For any practical purpose I came across so far while debugging guest
> kernels, that is not true when running against QEMU. Sure, if you want
> to dump gigabytes of RAM this way, it will be a bottleneck. But when do
> you have to do this while interactively debugging? Printing the content
> will still take longer than transmitting it.
> 
>> Also, the original gdb stub can dump out GDT/IDT/CR0 directly.
> 
> That is true, but it should be addressed in gdb. Folks there are aware
> of the issue and will happily discuss extension proposals and likely
> also take the necessary patches. It will be trivial to adapt QEMU to
> such an extension afterward.
> 
> Also, this is a temporary, just too long pending issue for x86. I'm not
> aware of such limitations for other architectures.
> 
> And there is actually workaround for the meantime: issue "monitor info
> registers" in the gdb session to obtain also those registers. "monitor
> cpu N" will allow you to switch between CPUs. It's not nice but saved my
> days a few times already.
> 
> Jan
> 
>> 
>> Thanksfrom Peter
>> 
>>> Date: Wed, 14 Nov 2012 10:54:02 +0000
>>> From: address@hidden
>>> To: address@hidden
>>> CC: address@hidden
>>> Subject: Re: [Qemu-devel] Adding another debug protocol
>>> 
>>> On 14 November 2012 10:45, Peter Cheung <address@hidden> wrote:
>>>> Dear All
>>>>    I am going to add another debugger server into QEMU, so i need to
>>>> 1) create another socket server, similar than gdbserver, to receive the
>>>> command from debugger
>>>> 2) add another option, such as "--start-debugger-server" to start the 
>>>> socket
>>>> server.
>>>> 
>>>> After I work out the whole thing, how can i ask for the qemu maintainer to
>>>> accept my code? I believe i should write a proposal first.
>>> 
>>> Probably worth including a summary of why your second debug protocol
>>> couldn't be implemented as a translation layer between gdbserver
>>> protocol and whatever it is you need.
>>> 
>>> -- PMM
> 
> -- 
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