[Lguest] [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes

[Ingo Molnar]

* H. Peter Anvin <hpa at zytor.com> wrote:

> Ingo Molnar wrote:
> > * Ingo Molnar <mingo at elte.hu> wrote:
> > 
> >> And as hpa's comments point it out, compressing the rather stupid 
> >> irq stubs might be a third option that looks promising as well.
> > 
> > ... and we should try and see how far we can compress those stubs, 
> > before we do any segment register based tricks.
> > 
> 
> Using the techniques previously mentioned, for 224 vectors:
> 
> 1792 bytes ( 8 bytes/stub) - trivial.
> 1568 bytes ( 7 bytes/stub) - same without alignment.
>  952 bytes (~4 bytes/stub) - extra jump needed.
> 
> For comparison, the IDT itself is 2048 bytes on x86-32 and 4096 bytes on
> x86-64.

sounds like a plan :)

	Ingo