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RE: [Xen-devel] trap/interrupt gate for hypercall

>Enter Xen on hypercall, immediately take an interrupt, on return from
>interrupt %es faults on reload. How do we propagate this bad segment
>   --> the problem is when return from interrupt how %es faults on reload
>       except interrupt handler purposely modify kernel stack? --> example?

By the guest modifying the referenced descriptor from another vCPU.

>register value to the guest via the failsafe callback handler from this
>context? The bad %es is not yet saved on the outer context's stack frame.


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