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

["Mark A. Williamson" <mark.williamson@xxxxxxxxxxxx>]

> 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".

Oh dear :-/

> 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?

Used to work but it's apparently rotted.  It does SHARE_PFN_WITH_DOMAIN an Xen 
but the userspace code doesn't use the xc_map_foreign_range() that Keir 
described.

I'll check in a fix, assuming nobody beats me to it.

Cheers,
Mark


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