Re: [Xen-devel] [PATCH 0/3] [RFC] User-space grant table device

[Derek Murray <Derek.Murray@xxxxxxxxxxxx>]

On 22 Mar 2007, at 02:28, Isaku Yamahata wrote:
> When auto translate physmap mode, grant table works based on
> pseudo physical address space. not virtual address space.
> Please see gnttab_set_map/unmap_op() using __pa().
> It is up to the guest kernel to map the pseudo physical address
> to kernel/user virtual address space using kernel functionality.
>
> Given that Linux adopts 1:1 mapping between pseudo physical address
> space and kernel virtual address space, there is
>
> Both setting vm_private_data and calling vm_insert_page are necessary.
> vm_insert_page() is the counter part of GNTMAP_application_map for
> auto translated phymap mode.
> I may be worng because I haven't taken closer look of your code,  
> though.
Okay, the reimplementation of the driver following the blktap model  
seems to be going well, and has also managed to tease out a couple of  
bugs. I'll post an updated patch probably early next week.
> I'm willing to review/test.
> Do you have any testing program? Can you provide it?
> I may need it when test.
Thanks for your offer! This would be very useful. My current plan is  
to test it on x86_32 with shadow paging turned off and then on, and  
once this works I will resubmit the patch. My testing program is in  
two parts: one based on Mini-OS, which I use to have a domain that  
grants a few pages, and the other which runs in dom0 and calls my  
modified libxc. I can supply this if necessary.
Regards,

Derek Murray.



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