[Xen-devel] idtr

["Travis Johnson" <travis.jo@xxxxxxxxx>]

Question:
When a guest domain does a "lidt" (the x86 instruction) to update the pointer to the IDT where 
does this information get stored inside Xen (assuming it does). I know 
Xen can interject interrupts into a domain and that the 
"guest_vcpu_context" struct contains an array that represents the 
virtual IDT but how does the virtual IDT relate to the actual IDT the 
guest OS uses and is pointed to by it's idtr. It seems logical to me 
that the idtr must be stored inside the vcpu at some point somewhere 
since I can run a "sidt" and get what seems like a reasonable address 
(from the guest's point of view). I've also used "lidt"'s without 
crashing the system so Xen handles the update correctly.

I'm using HVM(VMX) guests on 64bit Xen (3.0.3 - the stable tarball from 
xensource). The guests run FC6.

Thanks. This list is always a good read.
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