UML on AMD64 x86_64

Jim,

You can run a 32-bit UML on an AMD 64-bit OS. However, there are some issues:

1. The guest kernel needs to be compiled on a 32-bit OS. While it will run on the 64-bit, I haven't had any success with compiling.
2. The host SKAS patch has not yet been ported (publicly) to AMD 64-bit. So your guest kernels will ONLY run in TT mode.

Good luck!

Tony

I'm using 64 bit Gentoo on an Athlon64 and it would be really nice to have a working port of 32 bit UML. This would allow us to sandbox a 32 bit Gentoo kernel within the 64 bit Gentoo environment.

I want to emphasize that I'm not even asking for a real 64 bit UML port, I simply want the standard UML 32 bit port to compile, and run, in amd64 32-bit mode. This would allow people in amd64 linux-land to have some form of UML to use while we wait for a true 64-bit implementation.

I tried simply compiling the 32 bit UML port using gcc 3.3.4 and "linux32 make linux ARCH=um" with a SUBARCH := i386, but this failed complaining about things like

arch/um/sys-i386/util/mk_sc.c:30: error: structure has no member named `eax'

I'm surprised UML didn't compile so if anyone has some suggestions to try, please let me know.

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