Re: port-xen/52016: Mismatch between mem_clusters and pmap_enter bounds check

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

The following reply was made to PR port-xen/52016; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: port-xen-maintainer%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
        netbsd-bugs%netbsd.org@localhost, coypu%sdf.org@localhost
Subject: Re: port-xen/52016: Mismatch between mem_clusters and pmap_enter
 bounds check
Date: Wed, 1 Mar 2017 10:04:07 +0100

 On Wed, Mar 01, 2017 at 09:00:01AM +0000, Martin Husemann wrote:
 > The following reply was made to PR port-xen/52016; it has been noted by GNATS.
 > 
 > From: Martin Husemann <martin%duskware.de@localhost>
 > To: gnats-bugs%NetBSD.org@localhost
 > Cc: 
 > Subject: Re: port-xen/52016: Mismatch between mem_clusters and pmap_enter
 >  bounds check
 > Date: Wed, 1 Mar 2017 09:59:01 +0100
 > 
 >  On Wed, Mar 01, 2017 at 08:55:01AM +0000, Manuel Bouyer wrote:
 >  >  This is used by X11 to access the video adapter.
 >  
 >  So how can we find the bounds that the hypervisor allows for that and
 >  deny access outside of that?
 
 I don't know. Maybe we should change the pmap to gracefully handle failure
 from mmu operations. But that's not trivial.
 On a physical hardware how do you know if a physical address is accessible or
 not ?
 
 -- 
 Manuel Bouyer <bouyer%antioche.eu.org@localhost>
      NetBSD: 26 ans d'experience feront toujours la difference
 --