Re: [Xen-devel] How to mmap xen pages?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

For each page you wish to share, you must 
SHARE_PFN_WITH_DOMAIN(page, dom0).

Then, from dom0 userspace, you must map the appropriate pages using 
libxc's xc_map_foreign_range(). Grep around in libxc itself for some
example uses.

 -- Keir

> I am try to convey a large data collection buffer from xen to a 
> userspace program running in domain 0. I examined the xentrace facility 
> and copied the code to mmap pages. My mmap fails, and upon trying out 
> the xentrace program, I found that it fails in exactly the same way, ie, 
> returns errno 11, "Resource Temporarily Unavailable". I have allocated 
> my memory buffers just like common/trace.c does it, etc. Is this trace 
> stuff not working anymore, did it ever work, and/or what is the 
> recommended way to do what I want?
> 
> Thanks,
> 
> Rob Gardner
> HP
> 
> 
> 
> 
> 
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