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SubjectRe: [PATCH] kvm: x86: disable KVM_FAST_MMIO_BUS

> We actually know what to expect (a write) so we could maybe
> optimize this some more with a dedicated function just for this.

We don't know the addressing mode, the size or the source (immediate
vs. register), so no.

KVM is already doing a single translation and read no matter how long
the instruction (unless it cross page boundaries).


> >
> > However, the eventfd is written before decoding, while full emulation
> > would write it after. So while VCPU thread latency is worse compared to
> > skip_emulated_instruction, latency to the iothread remains small.
> >
> > Paolo

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