bug#22633: Provide a kvm-less qemu / guix system vm

[Christopher Allan Webber]

Jookia writes:

> On Mon, Feb 22, 2016 at 11:35:30AM -0800, Christopher Allan Webber wrote:
>>    #~(string-append
>> -     " -enable-kvm -no-reboot -net nic,model=virtio \
>> +     ;; Only enable kvm if we see /dev/kvm exists.
>> +     ;; This allows uers without hardware virtualization to still use these
>> +     ;; commands.
>> +     #$(if (file-exists? "/dev/kvm")
>> +           " -enable-kvm "
>> +           "")
>> +     " -no-reboot -net nic,model=virtio \
>>    " #$@(map virtfs-option shared-fs) " \
>>    -net user \
>>    -serial stdio -vga std \
>> -- 
>> 2.6.3
>
> What if I enable KVM then run the script?
>
> Jookia.

Then it should use KVM.