Re: [PATCH 18/25] [PATCH] turn priviled operations into macros in entry.S

If you were talking about the general iretq => INTERRUPT_RETURN, then the
answer is "Yes, they are sufficient". The first version of lguest ran the
guest kernel in ring 3 (using dual page tables for guest kernel and guest
user).  The current version I'm pushing runs lguest in ring 1, and the
entry.S code  worked for both.

How do you implement system calls then? 

-Andi