On Wed, 2008-04-09 at 10:44 +0200, Carlo Bertoldi wrote:> Hi,
> I''d like to do some operation every time an hypercall is issued
in a
> domU kernel. I started modifying
> include/asm-i386/mach-xen/asm/hypercall.h but I don''t think
it''s such a
> great idea, so I think that, as a last chance, I''ll have to
substitute
> all of the hypercall function call with some wrapper function of my own.
> Can anyone tell me if there''s a cleaner approach?
It''ll take some assembly. All hypercalls enter the VMM through the same
trap handler in arch//entry.S (e.g. syscall_enter on x86_64). A good
point to catch these entries would be somewhere shortly after the
SAVE_ALL macro. Note that you''ll have to carefully restore register
arguments clobbered after return [depending on individual calling
conventions]. Mail me if you get stuck with that.
kind regards,
Daniel
--
Daniel Stodden
LRR - Lehrstuhl für Rechnertechnik und Rechnerorganisation
Institut für Informatik der TU München D-85748 Garching
http://www.lrr.in.tum.de/~stodden mailto:stodden@cs.tum.edu
PGP Fingerprint: F5A4 1575 4C56 E26A 0B33 3D80 457E 82AE B0D8 735B
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