Re: [Xen-devel] Suspend or kill a syscall in hypervisor

To:	xen-devel@xxxxxxxxxxxxxxxxxxx
Subject:	Re: [Xen-devel] Suspend or kill a syscall in hypervisor
From:	Carlo Maiero <zesster@xxxxxxxxx>
Date:	Wed, 6 Oct 2010 18:10:17 +0200
Delivery-date:	Wed, 06 Oct 2010 09:11:18 -0700
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2010/10/4 Carlo Maiero <zesster@xxxxxxxxx>

I've made a patch that intercept some type of (malicious) hypercall and syscall of domU in the hypervisor,
and handle the log in the dom0.

How can i suspend or kill a certain syscall (or hypercall) on a vcpu?

The easy way is to suspend the virtual machine, but i think it's unnecessary.

To block the instruction, i think i've to clear vcpu register and skip to the next instruction, or set failure result in a register.

To stop the execution of the process i've to call a function in traps.c i think near line 400.

This function will wait for a value to be 1.

Which is the best way to implement a semaphore at this level?

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Re: [Xen-devel] Suspend or kill a syscall in hypervisor