Re: [Xen-devel] Grant Tables between dom0 and domU?

[tgh <tianguanhua@xxxxxxxxxx>]

hi
I try to read the granttable code of xen,I am confused about some fields
in the struct grant_table,such as 
struct grant_entry **shared; 
struct active_grant_entry **active; 
struct grant_mapping **maptrack; 

what are the functions for the three structures ?
in the grant_table_create() function,each entry of three structures is 
allocated a page frame,is it right?
if it is,when we try to use a grant page ,three pages are needed to be 
allocated for matadata,or how does it work?


I am confused about it

could you help me
Thanks in advance






Mark Williamson åé:
> > Subsequent lines suggest mechanism sharing between only unpriviliged
> > domains.
> >
> > Can grant tables be used for this capability based shared memory
> > communication between dom0 and domUs?
> >     
> Yes, using grant tables is an unprivileged operation so any domain can use it 
> (well, HVM is limited in this respect) - dom0 and domU can share memory if 
> appropriate.
> This is used by the split Io drivers, etc.
>
> Cheers,
> Mark
>
>   

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