On Tue, Sep 1, 2015 at 8:32 AM, Antoine Martin <anto...@nagafix.co.uk> wrote: > On 27/08/15 20:14, Mark Morgan Lloyd wrote: >> The (unofficial?) FAQ at http://uml.devloop.org.uk/faq.html implies that >> it is possible to build UML on a 64-bit system to run a 32-bit guest. > You can build a 32-bit *kernel* from a 64-bit host. >> The best that I can manage on e.g. Debian "Jessie" x86-64 is to use >> make ARCH=um SUBARCH=i386 which results in a 32-bit ELF to presumably >> run a 32-bit guest. Prerequisites appear to be the multiarch-support >> and gcc-multiarch packages. >> >> Is it possible to build UML as a 64-bit binary, but to run a 32-bit >> guest? > AFAIK, no. >> What I'd like to be able to do is to put it on a system which has >> no multiarch stuff, i.e. to completely sequester the 32-bit libraries >> etc. within the guest filesystem. >> >> [Background: I used UML fairly heavily in the 2.4 era, but I'm a >> comparative newcomer to x86-64. I'm trying to avoid overuse of >> multi-arch stuff.] > AFAIK, there is no multiarch support in in the UML *kernel*.
Yes. 64bit UML has no ia32 emulation like x86_64 has. -- Thanks, //richard ------------------------------------------------------------------------------ _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
