[uml-devel] UML on AMD64 x86_64

[uml-devel] UML on AMD64 x86_64

[jmf]

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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Re: [uml-devel] UML on AMD64 x86_64

[Anthony Brock]

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


>>> "jmf" <jmfguy@excite.com> 09/22/04 06:07AM >>>



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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on
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Re: [uml-devel] UML on AMD64 x86_64

[Michael Richardson]

-----BEGIN PGP SIGNED MESSAGE-----


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



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

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

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

  a) Is this with a stock kernel or a gentoo kernel?
     (sorry, but gentoo has a poor reputation for quality control)

  b) can you build a kernel for i386? (no UML)
     This would be a cross-compile build.

  c) are you using an i386 compiler, or and amd64 compiler?
     You will need a cross-compiler!

- --
]     "Elmo went to the wrong fundraiser" - The Simpson         |  firewalls  [
]   Michael Richardson,    Xelerance Corporation, Ottawa, ON    |net architect[
] mcr@xelerance.com      http://www.sandelman.ottawa.on.ca/mcr/ |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [
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