[Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one

[Glauber Costa <glommer@redhat.com>]

> > 
> > Now, if you remember the last memory patches I sent, it actually removes
> > this line. However, this is because in that alternative, we were tracking
> > mmio regions in qemu, but not in kvm. so flags >= TLB_MMIO would just
> > delete it from the kernel mapping, but qemu would not forget about it.
> > 
> > This is to show that I believe that it might be possible to handle mmio
> > regions slightly different, but I don't think just dropping this line would
> > help much.
> 
> What confused me most here - and still does - is that TLB_* flags make
> semantically no sense to me in the physical memory
> registering/unregistering context. They should only show up in
> CPUTLBEntry, no? But maybe I'm overseeing some strange relation.
> 
I might be wrong, but I believe it's used quite often in normal memory
to track pieces of memory in which we do mmio.