> 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). Paolo > > > > 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 >