[OpenWrt-Devel] [PATCH] Make virtualization guests built for pentium4 with SMP

Daniel Gimpelevich daniel at gimpelevich.san-francisco.ca.us
Sun Jul 12 12:25:03 EDT 2015

On Sun, 2015-07-12 at 14:00 +0200, Hauke Mehrtens wrote:
> Will this work on most CPUs also the Atoms and so on?
> I would rather prefer -march=i686 and -mtune=generic for the x86
> virtual
> machine images, but I am not an x86 expert. Do I need hardware support
> for visualization in my host CPU for all these images? Are all the AMD
> CPUs with hardware visualization support when IO build with
> -march=pentium4 ?

It's already used for the Xen guest kernel, just not GCC. The gcc
manpage says that all -march=pentium4 means is enable MMX, SSE, and
SSE2, which I believe the old Atoms support, but even if they don't,
running any VM on such low-spec processors isn't likely to work anyway.
Using -march=i686 is an alias for Pentium Pro, that is, before the
Pentium II.
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