On Tue, Mar 01, 2022 at 11:39:29AM +0000, Andrew Cooper wrote: > This isn't really "must". The guest is perfectly capable of sharing > memory with the hypervisor. > > It's just that for now, bounce buffering is allegedly faster, and the > simple way of getting it working. Yeah, I guess you щould just share/unshare on demand. But given that this isn't implemented it is a must in the current kernel. But if you want a different wording suggest one and I'll put it in.