[RFC 0/4] Virtio uses DMA API for all devices

[Christoph Hellwig]

On Mon, Aug 06, 2018 at 07:06:05PM +0300, Michael S. Tsirkin wrote:
> > I've done something very similar in the thread I posted a few years
> > ago.
> 
> Right so that was before spectre where a virtual call was cheaper :(

Sorry, I meant days, not years.  The whole point of the thread was the
slowdowns due to retpolines, which are the software spectre mitigation.