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

[H. Peter Anvin]

Ingo Molnar wrote:
> 
> yes, the accessed bit in the segment descriptor has to be updated in 
> an atomic transaction: the CPU has to do a MESI coherent 
> read+compare+write transaction, without damaging other updates to the 
> 6 bytes segment descriptor.
> 

8 bytes, rather.