[vbox-dev] SysyemCall in VirtualBOx

[Nikolay Igotti]

      Francesco,

  Hypervisor controls IDT guest really executes with, thus  it can 
control the way traps are delivered.  Switcher saves/modifies IDT, along 
with other priviledged registers,
so host kernel trap handlers aren't touched. Hope it answers your question.

   Nikolay

15.10.2010 20:05, Francesco Di Paolo ?????:
> hello there,
> i'd like to have some informations in regards to how the hypervisor 
> takes over when a system call(int 0x80) occurs in the guest OS. How it 
> is managed the passage from Ring3 to Ring1. What i'm facing is 
> understand what is going on when an application in the guest OS 
> invokes a system call(i didn't get if it is involved the host kernel 
> and its IDT or if there are interactions only between the application 
> and the guest kernel). If you could give us some suggestions, we would 
> be very grateful.
>
>
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