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xen-ia64-devel
Re: [Xen-devel] [PATCH 0/3] [RFC] User-space grant table device
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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