RE: [Xen-devel] [PATCH][RESEND]Nvram patch for IA64

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

 > Thank you for the info. It is clear to me now. we will update 
> the patch as following: 
> 
> xenstore:
> local= " "
>    domain = ""
>         x = ""                #  domain id
>            nvram            #  nvram dir
>                file             #  nvram file path
>                data_in       # data index + 64 bytes data, 
> 128 characters, for qemu write
>                data_out     # data index + 64 bytes data, 128 
> characters, for qemu read
> 
> xend register two watches on data_in node and data_out node. 
> * qemu write data: qemu write "index+data" to data_in node,  
> xend data_in watch handler will copy the data to persisted file. 
> * qemu read data: qemu write index to data_out node; xend 
> data_out watch handler copy data from persisted file to 
> data_out node; qemu read data_out node.

I don't think you need the file path -- the data should be stored in the
xend 'database' until you come to export the VM.

After initialisation, all the writes to the data will come from qemu,
hence I don't see why you need data_in and data_out. Can't you just have
a 'data' node?

Ian

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