Question: How to write a file in domain 0?

Question: How to write a file in domain 0?

[Zhao Lin]

hey all,

a complete newbie here..I'm trying to implement a hypercall that takes
a string argument and then appends the string to a selected file
stored in domain0's hard disk.

I browsed through the source code but couldn't figure out a way to do
this. I'm thinking that I might need to get a reference to domain 0's
kernel and then ask the kernel to call printk() with the provided
string. Not sure if this is correct since I don't even know how domain
0 as well as other domains is referenced by the hypervisor..

How should I approach this? I'm desperately trying to learn here..

Hope this mailing list is the correct place to post my question..Open
to any suggestion. Thanks,

Question: How to write a file in domain 0?

[Zhao Lin]

============
This email has been sent this morning..but not sure if it's been
received so I'm sending it again.
If this is not the proper mail list for my question, can anyone
suggest the proper one? Thanks,
============

hey all,

a complete newbie here..I'm trying to implement a hypercall that takes
a string argument and then appends the string to a selected file
stored in domain0's hard disk.

I browsed through the source code but couldn't figure out a way to do
this. I'm thinking that I might need to get a reference to domain 0's
kernel and then ask the kernel to call printk() with the provided
string. Not sure if this is correct since I don't even know how domain
0 as well as other domains is referenced by the hypervisor..

How should I approach this? I'm desperately trying to learn here..

Hope this mailing list is the correct place to post my question..Open
to any suggestion. Thanks,

Re: Question: How to write a file in domain 0?

[Samuel Thibault]

Hello,

You may want to have a look at fsfront/fsback.

Samuel

Re: Question: How to write a file in domain 0?

[Zhao Lin]

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thanks for reply.. but i think i might need to pass the data to domain0
through shared memory and then called corresponding functions in domain0
kernel to finish the task.

On Sat, Jul 11, 2009 at 11:36 PM, Samuel Thibault <
samuel.thibault@ens-lyon.org> wrote:

> Hello,
>
> You may want to have a look at fsfront/fsback.
>
> Samuel
>

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Re: Question: How to write a file in domain 0?

[Hui Kang]

I think the actual read/write operations are done in the /tapdisk 
/process in Dom0.

- Hui

Zhao Lin wrote:
> thanks for reply.. but i think i might need to pass the data to 
> domain0 through shared memory and then called corresponding functions 
> in domain0 kernel to finish the task.
>
> On Sat, Jul 11, 2009 at 11:36 PM, Samuel Thibault 
> <samuel.thibault@ens-lyon.org <mailto:samuel.thibault@ens-lyon.org>> 
> wrote:
>
>     Hello,
>
>     You may want to have a look at fsfront/fsback.
>
>     Samuel
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>   

Re: Question: How to write a file in domain 0?

[Samuel Thibault]

Zhao Lin, le Sun 12 Jul 2009 08:23:47 -0400, a écrit :
> thanks for reply.. but i think i might need to pass the data to domain0 through
> shared memory and then called corresponding functions in domain0 kernel to
> finish the task.

That's precisely what fsback/fsfront does.

Samuel