On Wed, Jul 15, 2020 at 02:29:04PM +0100, Alex Bennée wrote: > Stefan Hajnoczi <[email protected]> writes: > > On Tue, Jul 14, 2020 at 10:43:36PM +0100, Alex Bennée wrote: > >> Finally I'm curious if this is just a problem avoided by the s390 > >> channel approach? Does the use of messages over a channel just avoid the > >> sort of bouncing back and forth that other hypervisors have to do when > >> emulating a device? > > > > What does "bouncing back and forth" mean exactly? > > Context switching between guest and hypervisor.
I have CCed Cornelia Huck, who can explain the lifecycle of an I/O request on s390 channel I/O. Stefan
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