xc_map_foreign_bulk() memory leak in ARM version?

[Nyashka Surovski <nyashka.surovski@gmail.com>]

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Hi Xen folks!

I've faced with one strange thing in ARM version of Xen: when I use
xc_map_foreign_bulk() to map some memory from domU to dom0, after unmap()
for previous returned address - memory is not freed at all.

Let's look at call stack:

xc_map_foreign() ->
  linux_privcmd_map_foreign_bulk() ->
    {
    addr = mmap(fd);
    ioctl(fd, IOCTL_PRIVCMD_MMAPBATCH_V2 );
    }  ->
      alloc_empty_pages() ->
        alloc_xenballoned_pages();

So, I think that unmap(addr) must call free_xenballoned_pages(), but this
doesn't happen. =(
Let me note, that mmap() knows about privcmd_close() function, and it is
the place where free_xenballoned_pages() is called, So we have that unmap()
doesn't call privcmd_close() at all. It's something strange for me.

Can somebody show me the place of my misunderstanding, or is it a real bug?

Best regards,
Nyashka

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