Re: 68a1c816868b3e35a1da698af412b29e61b1948a In general, I like the idea (especially since I've proposed it before. ;-)
However: + if (have_guest_base) { + flags |= MAP_FIXED; + } I think this is broken. If the user specifies -G n -R m they're hoping or guessing that the range [n,n+m) is free. What they're not expecting is for the qemu application or any of the required shared libraries to get forcibly unmapped. I think instead you should simply adjust the error reporting after the mmap attempt without MAP_FIXED. r~