[yocto] Request to enable SMP and virtio for qemux86/x86-64

[Zhai, Edwin]

Bruce,
Can we enable SMP and virtio by default for qemux86/x86-64? This can achieve 
huge perf boost for workload inside qemu. E.g. we enabled self-hosted image, 
where we build yocto inside qemu.

Attached patch showes the kernel config option.

Is it reasonable?

Thanks,
Edwin

-- 
best rgds,
edwin
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