[Xen-devel] address mapping between domains

[Zhiyi Huang <zhiyi6@xxxxxxxxxx>]

Hi, I am trying to figure out how address mapping is done for zero-copy I/O. Is 
it allowed by the hypervisor that a page allocated to domain0 (the privileged 
domain) is mapped to the address space of a domainU? So far it seems to be the 
other way around: a page from a domainU is mapped to the address space of 
domain0 when I/O requests are sent to domain0.

Another question is about the hypercall: update_va_mapping. It has three 
arguments: vaddr, val, flags. Can anyone kindly explain the meaning of them and 
how they are used in the hypercall? Actually I am puzzled why there is no 
machine page id as an argument, since the virtual address should be mapped to a 
machine page anyway when the page table is updated.

Thanks a lot.

--------------------------
Zhiyi from EPFL Switzerland



-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/xen-devel