Help in fixing a issue

Help in fixing a issue

[PREETI MISHRA]

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I have a patch in Xen which stores some information of VM process. I have
another program running in Dom0 which intercept this information.

i) I want to configure my patch running in Xen to send the alert
notification to program running in Dom0 to read data, probably using event
channels. How to configure event channel?
ii) Which API or command will be used to read the data from patch buffer.

I am running xen 4.6 in ubuntu 14.04

regards,

Preeti

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Re: Help in fixing a issue

[Wei Liu]

On Fri, Feb 05, 2016 at 09:15:52PM +1100, PREETI MISHRA wrote:
> I have a patch in Xen which stores some information of VM process. I have
> another program running in Dom0 which intercept this information.
> 

I'm not sure I can parse this sentence. It's too vague for what you want
to do. For one, I don't know what "VM process" is.

> i) I want to configure my patch running in Xen to send the alert
> notification to program running in Dom0 to read data, probably using event
> channels. How to configure event channel?
> ii) Which API or command will be used to read the data from patch buffer.
> 

If you're writing user space program, code in QEMU might be a good
reference.

Please search for files like "xen_nic.c" in QEMU source code and start
from there.

You can also explore various Xen driver code inside Linux if you're
keen.

Another thing that might be of interest to you is a program lives in
xen.git called xentrace. It extracts buffer from hypervisor, which might
be what you need.

Wei.

> I am running xen 4.6 in ubuntu 14.04
> 
> regards,
> 
> Preeti

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

Re: Help in fixing a issue

[Wei Liu]

Add back xen-devel, please use "reply-all" in the future.

And please don't top-post.

On Fri, Feb 05, 2016 at 10:01:57PM +1100, PREETI MISHRA wrote:
> Thanks for the reply,
> 
> actually, I have a virtual machine in which some processes are running. I
> want to analysis their behavior using VMI at xen.
> 

Have you checked out libvmi in this case?

> My tool has two components:i) xen patch running at hypervisor ii) analyzing
> component running at Dom0
> 
> 1. Xen patch is responsible for collecting the system call information of a
> monitored process. It can be syscall no and process id.
>       - how to take this information? //particularly i want to trap any
> execution of monitored programs.
>       - how to store this information in buffer?
>        -how to send alert to my another daemon (analyzing component)
> running in Dom0.

See xentrace / xenanalyze in xen.git.

> 2. On receiving alert, analyzing component perform analysis over the
> collected data.
>       - how to send the buffer information (pid and system call no) to
> analyzing component?
> 

Anyway, I'm not expert on this. I will let other people to have a look.

My gut feeling is that libvmi should be the way to go.

Wei.

Re: Help in fixing a issue

[Wei Liu]

BTW please check out:

 http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions

Wei.