| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
Re: [Xen-devel] bogus gfn - mfn - gfn - mfn checks in guest_physmap_add_
At 15:03 +0000 on 25 Nov (1290697390), Olaf Hering wrote:
> On Wed, Nov 24, Tim Deegan wrote:
>
> > The problem is that PV guests set their own m2p entries and can't be
> > relied on to tear them down.
>
> What needs to happen for PV guests?
> Dont they use the machine_to_phys_mapping[] array like HVM guests?
They do, but they can put whatever they like in it, and don't have to
clean up afterwards.
> I see memory_exchange uses assign_pages() to move mfns from one domain
> to another (havent studied the whole function yet). I think thats
> another place that needs an audit wether the machine_to_phys_mapping[]
> array is maintained properly.
Good catch. It might be better to hook page_set_owner(), which ought to
imply that the old m2p info is stale. I had a quick look at all its
callers and I _think_ it would be OK, but I haven't tested that at
all. :)
Tim.
--
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd. (Company #02937203, SL9 0BG)
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home