How does domain0 export information to guest through xenstore

How does domain0 export information to guest through xenstore

[胡少龙]

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Hi,
    I am tring to write xenstore some information ,so that a guest can read, if i simply xenstore-write /foo "123" in domain 0, guest have not the permission to read this ,and guest domain number are dynamic, so i can not write a program to write /local/domain/X, which X is the domain id i want to export information to, can i ?
    So, is there a path (a static path,without domain number)that i write to in domain 0, and guests have the permission to read ? Or, some other solution? Thanks.
 
Hu Shaolong


      

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Re: How does domain0 export information to guest through xenstore

[Fajar A. Nugraha]

On Mon, Aug 9, 2010 at 7:31 AM, 胡少龙 <sunofblack@yahoo.cn> wrote:
>
> Hi,
>     I am tring to write xenstore some information ,so that a guest can read, if i simply xenstore-write /foo "123" in domain 0, guest have not the permission to read this ,and guest domain number are dynamic, so i can not write a program to write /local/domain/X, which X is the domain id i want to export information to, can i ?
>     So, is there a path (a static path,without domain number)that i write to in domain 0, and guests have the permission to read ?

You could make use of virsh to convert domU name to id. Something like this:

On dom0:
# virsh domid domUname
41
# DOMU_ID=`virsh domid domUname`
# xenstore-write /local/domain/${DOMU_ID}/my-data "test-data"
# xenstore-read /local/domain/${DOMU_ID}/my-data
test-data

on domU:
# xenstore-read my-data
test-data

-- 
Fajar