Re: [Qemu-devel] [PATCH for-1.7 v2 0/8] fix address space size issue

[Michael S. Tsirkin]

On Thu, Nov 07, 2013 at 04:07:34PM +0100, Paolo Bonzini wrote:
> Il 07/11/2013 16:05, Michael S. Tsirkin ha scritto:
> >> > So, ack for patch 5-7-8, which should also be enough to fix the problem
> >> > that Luiz reported.
> > Not at all. As long as exec.c ignores high bits, any access
> > there will end up in the wrong region.
> 
> ... unless it happens to be the correct region because the whole
> 2^64-bit range is covered by a single region.  This is what happens for
> IOMMUs.
> 
> Paolo

Only if you are lucky.
What makes sure ignoring high bits does not hit the e1000 MMIO?
Nothing I think.

> > We might not get a crash but we'll get guest memory corruption.