Re: [Xen-devel] PCI delegation works, access to the delegated NIC doesn't

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 Mar 2006, at 23:05, Ryan wrote:

> That is true. However, it seems to me that most people don't put the
> driver alone in the driver domain. Rather, they put the device in a 
> domU
> they wish to run many applications in. If the domain is compromised, an
> attacker could cause a *little* bit of havoc on the pci bus (affecting
> devices in other domains) by messing with registers like the BARs or
> possibly DoS other devices by changing the interrupt pin.
I guess that is true for some users, even though it was never our model 
for driver domains. Of course the BARs are actually off limits, since 
you have explicit handlers for those. :-) But your point is taken. 
Having explicit handlers at least for some common devices is not a bad 
idea, to allow some common system configurations to run without needing 
to set permissive mode.
 -- Keir


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