[Xen-devel] [PATCH for-4.12 0/4] tools: Internal fd access, etc.

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

I am working on auditing whether deprvileging qemu has actually
worked.  The approach I have chosen is to fish the descriptors out of
qemu (by using debugging facilities), and try to make hypercalls
etc. using them.

To take making a hypercall as an example: this is not easily done
without libxc.  So I need to make libxc make a hypercall with a
different fd - actually, a different open-file.  I do this by using
dup2 to overwrite libxc's fd with the one stolen from qemu.  That
means I need to know libxc's fd number.  Hence the middle two patches
in this series.

Also, I drop some obsolete declarations and improve an error message.

I doubt this is 4.11 material.  qemu depriv is not covered by support
in 4.11 anyway.  In 4.12 I want it to be supported, and, therefore,
tested and audited.  If it becomes fully supported there, it might be
worth backporting some of these patches.

Thanks,
Ian.

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