Re: [Xen-devel] How to log system calls from a PV DomU under Xen

[Shakeel Butt <shakeel.butt@xxxxxxxxx>]

> 2. How is the system call flow happening in Xen?
>  Where in the code is the system call being intercepted by the hypervisor
> for a PV DomU. ?
>
> I found some information from this paper,
> http://hal.archives-ouvertes.fr/docs/00/43/10/31/PDF/Technical_Report_Syscall_Interception.pdf
>
> but still am not clear about the whole picture.
>
> Is there documentation available explaining for how system calls are handled
> in Xen ?
> The Xen code is quite large, and I am sorry to say I get lost reading it
> without some kind of knowledge.

Take a look at ENTRY(syscall_enter) in xen/arch/x86/x86_64/entry.S .

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