[Xen-devel] Re: Hypercall by DomU Application

[Srujan Kotikela <ksrujandas@xxxxxxxxx>]

On Tue, Oct 25, 2011 at 8:16 PM, Srujan Kotikela <ksrujandas@xxxxxxxxx> wrote:

Hi,

I am working on a security architecture. In this architecture, the application in DomU has to communicate directly with the hypervisor. But as I can see, the xen architecture allows only DomU kernel to raise a hypercall. I am planning to enable application to communicate with xen directly. I am assuming, setting up a trap gate with Ring-3 access should do the trick. I have few questions regarding this.

Is my idea feasible? ==> (  _set_gate(idt_table+HYPERCALL_VECTOR, 15, 3, &hypercall); )

Are there any security/performance/functional implications with this approach?

Thanks and regards,

SDK.

In the proposed security architecture, please note that, it is essential to NOT involve DomU kernel in the process of invoking the hypercall.

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