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[Xen-devel] Intercept system call trap on Xen,

To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Intercept system call trap on Xen,
From: Hui Kang <hkang@xxxxxxxxxxxxxxxxx>
Date: Tue, 7 Jun 2011 16:39:46 +0000
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Thread-topic: Intercept system call trap on Xen,
Hi, 
I have a question regarding intercepting the system call from a guest kernel on hypervisor. I am using xen-4.0.1 with a PV-guest. 
To disable the fast system call which bypasses the hypervisor, I first comment out this lines in the file
Xen/arch/x86/traps.c
      If (cur.vector == 0x80)
       {
    /* init_int80_direct_trap(curr); */
}
To verify this, when I boot the kernel, I add printk and see that init_int80_direct_trap is not executed. 

Then in the function in the same file as above, do_guest_trap, I add a printk to trap the system call from guest kernel

Static void do_guest_trap…
{
If (trapnr == 0x80)
printk("System call from guest");
}

However, when I run some program in the guest kernel to issue some system call, the hypervisor does not print out the message. Can anyone help on this? Thanks. 

- Hui

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