Re: [Xen-devel] kmap_atomic issue with SLES11SP1 32bit XEN driver code

[Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>]

On Thu, Dec 15, 2011 at 05:19:32PM -0600, dbrace wrote:
> Can you give me some URLs to documentation that can help me understand 
> my issue?
> 
> Is sounds like I cannot go back to the correct virtual address after I 
> map it for DMA.

Well yes. That assumption that virt_to_phys == phys_to_virt is not valid
anymore. The obvious solution to your problem is to carry a _both_
values - the bus address (the one you get from the DMA API), and the
virtual address (the one you get from alloc_page). That is how all the 
drivers do it.

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