At 16:46 31/10/2007, Tomá Kouba wrote:>Hello,
>is there a way how to be informed (called back) in dom0,
>when a specific action is taken in domU?
>
>I would like to react on a system call being issued in domU.
>If this is impossible is there any other action in domU that I can
>hook my function on?
The Xen kernel doesn''t know (or care) about Linux (or Windows) system
calls as such.
Some system calls will "do things" that the Xen kernel does care
about, such as update page tables, which will cause an entry into the
Xen kernel.
The only way for Xen to "know" about a system call would be if you
modify the system call itself to perform some sort of operation that
causes the Xen kernel to get involved with that. You could for
example fake a MSR read or write [by "fake" I mean to a unused MSR
number] operation inside the syscall , and then update the MSR read
or write function to detect your system call.
Does this help you?
--
Mats
>Thank you very much,
>
>--
>Tomas Kouba
>
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