On 10/16/2013 08:12 AM, Chris Murphy wrote: > Is a 64bit host expected to support running a 32bit guest OS in qemu/kvm? Or do archs need to match? 64-bit guets on 64-bit host exposing a 64-bit environment - works just fine; supported, uses hardware acceleration. 32-bit guest on 64-bit host exposing only a 32-bit environment - works just fine; supported, uses hardware acceleration. 32-bit guest on 64-bit host exposing a 64-bit environment - works just fine; supported, uses hardware acceleration. 32-bit guest on 32-bit host (necessarily exposing a 32-bit environment) - works just fine; supported, uses hardware acceleration (but gets less testing, as few people run virt hosts in 32-bit mode). No support for running a 64-bit guest on a 32-bit host (hardware just doesn't expose enough memory). Cross arch testing - works just fine, but slower (uses qemu emulation rather than hardware accelation), and a bit harder to support, but still useful; can only support a bit width in the guest <= bit width in the host. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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